xref: /aosp_15_r20/external/OpenCL-CTS/test_common/harness/imageHelpers.cpp (revision 6467f958c7de8070b317fc65bcb0f6472e388d82)

//
// Copyright (c) 2017,2021 The Khronos Group Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include "imageHelpers.h"
#include <limits.h>
#include <assert.h>
#if defined(__APPLE__)
#include <sys/mman.h>
#endif
#if !defined(_WIN32) && !defined(__APPLE__)
#include <malloc.h>
#endif
#include <algorithm>
#include <cinttypes>
#include <iterator>
#if !defined(_WIN32)
#include <cmath>
#endif

RoundingMode gFloatToHalfRoundingMode = kDefaultRoundingMode;

cl_device_type gDeviceType = CL_DEVICE_TYPE_DEFAULT;
bool gTestRounding = false;
double sRGBmap(float fc)
{
    double c = (double)fc;

#if !defined(_WIN32)
    if (std::isnan(c)) c = 0.0;
#else
    if (_isnan(c)) c = 0.0;
#endif

    if (c > 1.0)
        c = 1.0;
    else if (c < 0.0)
        c = 0.0;
    else if (c < 0.0031308)
        c = 12.92 * c;
    else
        c = (1055.0 / 1000.0) * pow(c, 5.0 / 12.0) - (55.0 / 1000.0);

    return c * 255.0;
}

double sRGBunmap(float fc)
{
    double c = (double)fc;
    double result;

    if (c <= 0.04045)
        result = c / 12.92;
    else
        result = pow((c + 0.055) / 1.055, 2.4);

    return result;
}


uint32_t get_format_type_size(const cl_image_format *format)
{
    return get_channel_data_type_size(format->image_channel_data_type);
}

uint32_t get_channel_data_type_size(cl_channel_type channelType)
{
    switch (channelType)
    {
        case CL_SNORM_INT8:
        case CL_UNORM_INT8:
        case CL_SIGNED_INT8:
        case CL_UNSIGNED_INT8: return 1;

        case CL_SNORM_INT16:
        case CL_UNORM_INT16:
        case CL_SIGNED_INT16:
        case CL_UNSIGNED_INT16:
        case CL_HALF_FLOAT:
#ifdef CL_SFIXED14_APPLE
        case CL_SFIXED14_APPLE:
#endif
            return sizeof(cl_short);

        case CL_SIGNED_INT32:
        case CL_UNSIGNED_INT32: return sizeof(cl_int);

        case CL_UNORM_SHORT_565:
        case CL_UNORM_SHORT_555:
#ifdef OBSOLETE_FORAMT
        case CL_UNORM_SHORT_565_REV:
        case CL_UNORM_SHORT_555_REV:
#endif
            return 2;

#ifdef OBSOLETE_FORAMT
        case CL_UNORM_INT_8888:
        case CL_UNORM_INT_8888_REV: return 4;
#endif

        case CL_UNORM_INT_101010:
#ifdef OBSOLETE_FORAMT
        case CL_UNORM_INT_101010_REV:
#endif
            return 4;

        case CL_FLOAT: return sizeof(cl_float);

        default: return 0;
    }
}

uint32_t get_format_channel_count(const cl_image_format *format)
{
    return get_channel_order_channel_count(format->image_channel_order);
}

uint32_t get_channel_order_channel_count(cl_channel_order order)
{
    switch (order)
    {
        case CL_R:
        case CL_A:
        case CL_Rx:
        case CL_INTENSITY:
        case CL_LUMINANCE:
        case CL_DEPTH:
        case CL_DEPTH_STENCIL: return 1;

        case CL_RG:
        case CL_RA:
        case CL_RGx: return 2;

        case CL_RGB:
        case CL_RGBx:
        case CL_sRGB:
        case CL_sRGBx: return 3;

        case CL_RGBA:
        case CL_ARGB:
        case CL_BGRA:
        case CL_sRGBA:
        case CL_sBGRA:
        case CL_ABGR:
#ifdef CL_1RGB_APPLE
        case CL_1RGB_APPLE:
#endif
#ifdef CL_BGR1_APPLE
        case CL_BGR1_APPLE:
#endif
#ifdef CL_ABGR_APPLE
        case CL_ABGR_APPLE:
#endif
            return 4;

        default:
            log_error("%s does not support 0x%x\n", __FUNCTION__, order);
            return 0;
    }
}

cl_channel_type get_channel_type_from_name(const char *name)
{
    struct
    {
        cl_channel_type type;
        const char *name;
    } typeNames[] = { { CL_SNORM_INT8, "CL_SNORM_INT8" },
                      { CL_SNORM_INT16, "CL_SNORM_INT16" },
                      { CL_UNORM_INT8, "CL_UNORM_INT8" },
                      { CL_UNORM_INT16, "CL_UNORM_INT16" },
                      { CL_UNORM_INT24, "CL_UNORM_INT24" },
                      { CL_UNORM_SHORT_565, "CL_UNORM_SHORT_565" },
                      { CL_UNORM_SHORT_555, "CL_UNORM_SHORT_555" },
                      { CL_UNORM_INT_101010, "CL_UNORM_INT_101010" },
                      { CL_SIGNED_INT8, "CL_SIGNED_INT8" },
                      { CL_SIGNED_INT16, "CL_SIGNED_INT16" },
                      { CL_SIGNED_INT32, "CL_SIGNED_INT32" },
                      { CL_UNSIGNED_INT8, "CL_UNSIGNED_INT8" },
                      { CL_UNSIGNED_INT16, "CL_UNSIGNED_INT16" },
                      { CL_UNSIGNED_INT32, "CL_UNSIGNED_INT32" },
                      { CL_HALF_FLOAT, "CL_HALF_FLOAT" },
                      { CL_FLOAT, "CL_FLOAT" },
#ifdef CL_SFIXED14_APPLE
                      { CL_SFIXED14_APPLE, "CL_SFIXED14_APPLE" }
#endif
    };
    for (size_t i = 0; i < sizeof(typeNames) / sizeof(typeNames[0]); i++)
    {
        if (strcmp(typeNames[i].name, name) == 0
            || strcmp(typeNames[i].name + 3, name) == 0)
            return typeNames[i].type;
    }
    return (cl_channel_type)-1;
}

cl_channel_order get_channel_order_from_name(const char *name)
{
    const struct
    {
        cl_channel_order order;
        const char *name;
    } orderNames[] = {
        { CL_R, "CL_R" },
        { CL_A, "CL_A" },
        { CL_Rx, "CL_Rx" },
        { CL_RG, "CL_RG" },
        { CL_RA, "CL_RA" },
        { CL_RGx, "CL_RGx" },
        { CL_RGB, "CL_RGB" },
        { CL_RGBx, "CL_RGBx" },
        { CL_RGBA, "CL_RGBA" },
        { CL_BGRA, "CL_BGRA" },
        { CL_ARGB, "CL_ARGB" },
        { CL_INTENSITY, "CL_INTENSITY" },
        { CL_LUMINANCE, "CL_LUMINANCE" },
        { CL_DEPTH, "CL_DEPTH" },
        { CL_DEPTH_STENCIL, "CL_DEPTH_STENCIL" },
        { CL_sRGB, "CL_sRGB" },
        { CL_sRGBx, "CL_sRGBx" },
        { CL_sRGBA, "CL_sRGBA" },
        { CL_sBGRA, "CL_sBGRA" },
        { CL_ABGR, "CL_ABGR" },
#ifdef CL_1RGB_APPLE
        { CL_1RGB_APPLE, "CL_1RGB_APPLE" },
#endif
#ifdef CL_BGR1_APPLE
        { CL_BGR1_APPLE, "CL_BGR1_APPLE" },
#endif
    };

    for (size_t i = 0; i < sizeof(orderNames) / sizeof(orderNames[0]); i++)
    {
        if (strcmp(orderNames[i].name, name) == 0
            || strcmp(orderNames[i].name + 3, name) == 0)
            return orderNames[i].order;
    }
    return (cl_channel_order)-1;
}


int is_format_signed(const cl_image_format *format)
{
    switch (format->image_channel_data_type)
    {
        case CL_SNORM_INT8:
        case CL_SIGNED_INT8:
        case CL_SNORM_INT16:
        case CL_SIGNED_INT16:
        case CL_SIGNED_INT32:
        case CL_HALF_FLOAT:
        case CL_FLOAT:
#ifdef CL_SFIXED14_APPLE
        case CL_SFIXED14_APPLE:
#endif
            return 1;

        default: return 0;
    }
}

uint32_t get_pixel_size(const cl_image_format *format)
{
    switch (format->image_channel_data_type)
    {
        case CL_SNORM_INT8:
        case CL_UNORM_INT8:
        case CL_SIGNED_INT8:
        case CL_UNSIGNED_INT8: return get_format_channel_count(format);

        case CL_SNORM_INT16:
        case CL_UNORM_INT16:
        case CL_SIGNED_INT16:
        case CL_UNSIGNED_INT16:
        case CL_HALF_FLOAT:
#ifdef CL_SFIXED14_APPLE
        case CL_SFIXED14_APPLE:
#endif
            return get_format_channel_count(format) * sizeof(cl_ushort);

        case CL_SIGNED_INT32:
        case CL_UNSIGNED_INT32:
            return get_format_channel_count(format) * sizeof(cl_int);

        case CL_UNORM_SHORT_565:
        case CL_UNORM_SHORT_555:
#ifdef OBSOLETE_FORAMT
        case CL_UNORM_SHORT_565_REV:
        case CL_UNORM_SHORT_555_REV:
#endif
            return 2;

#ifdef OBSOLETE_FORAMT
        case CL_UNORM_INT_8888:
        case CL_UNORM_INT_8888_REV: return 4;
#endif

        case CL_UNORM_INT_101010:
#ifdef OBSOLETE_FORAMT
        case CL_UNORM_INT_101010_REV:
#endif
            return 4;

        case CL_FLOAT:
            return get_format_channel_count(format) * sizeof(cl_float);

        default: return 0;
    }
}

uint32_t next_power_of_two(uint32_t v)
{
    v--;
    v |= v >> 1;
    v |= v >> 2;
    v |= v >> 4;
    v |= v >> 8;
    v |= v >> 16;
    v++;
    return v;
}

uint32_t get_pixel_alignment(const cl_image_format *format)
{
    return next_power_of_two(get_pixel_size(format));
}

int get_8_bit_image_format(cl_context context, cl_mem_object_type objType,
                           cl_mem_flags flags, size_t channelCount,
                           cl_image_format *outFormat)
{
    cl_image_format formatList[128];
    unsigned int outFormatCount, i;
    int error;


    /* Make sure each image format is supported */
    if ((error = clGetSupportedImageFormats(context, flags, objType, 128,
                                            formatList, &outFormatCount)))
        return error;


    /* Look for one that is an 8-bit format */
    for (i = 0; i < outFormatCount; i++)
    {
        if (formatList[i].image_channel_data_type == CL_SNORM_INT8
            || formatList[i].image_channel_data_type == CL_UNORM_INT8
            || formatList[i].image_channel_data_type == CL_SIGNED_INT8
            || formatList[i].image_channel_data_type == CL_UNSIGNED_INT8)
        {
            if (!channelCount
                || (channelCount
                    && (get_format_channel_count(&formatList[i])
                        == channelCount)))
            {
                *outFormat = formatList[i];
                return 0;
            }
        }
    }

    return -1;
}

int get_32_bit_image_format(cl_context context, cl_mem_object_type objType,
                            cl_mem_flags flags, size_t channelCount,
                            cl_image_format *outFormat)
{
    cl_image_format formatList[128];
    unsigned int outFormatCount, i;
    int error;


    /* Make sure each image format is supported */
    if ((error = clGetSupportedImageFormats(context, flags, objType, 128,
                                            formatList, &outFormatCount)))
        return error;

    /* Look for one that is an 8-bit format */
    for (i = 0; i < outFormatCount; i++)
    {
        if (formatList[i].image_channel_data_type == CL_UNORM_INT_101010
            || formatList[i].image_channel_data_type == CL_FLOAT
            || formatList[i].image_channel_data_type == CL_SIGNED_INT32
            || formatList[i].image_channel_data_type == CL_UNSIGNED_INT32)
        {
            if (!channelCount
                || (channelCount
                    && (get_format_channel_count(&formatList[i])
                        == channelCount)))
            {
                *outFormat = formatList[i];
                return 0;
            }
        }
    }

    return -1;
}

void print_first_pixel_difference_error(size_t where, const char *sourcePixel,
                                        const char *destPixel,
                                        image_descriptor *imageInfo, size_t y,
                                        size_t thirdDim)
{
    size_t pixel_size = get_pixel_size(imageInfo->format);

    log_error("ERROR: Scanline %d did not verify for image size %d,%d,%d "
              "pitch %d (extra %d bytes)\n",
              (int)y, (int)imageInfo->width, (int)imageInfo->height,
              (int)thirdDim, (int)imageInfo->rowPitch,
              (int)imageInfo->rowPitch
                  - (int)imageInfo->width * (int)pixel_size);
    log_error("Failed at column: %zu   ", where);

    switch (pixel_size)
    {
        case 1:
            log_error("*0x%2.2x vs. 0x%2.2x\n", ((cl_uchar *)sourcePixel)[0],
                      ((cl_uchar *)destPixel)[0]);
            break;
        case 2:
            log_error("*0x%4.4x vs. 0x%4.4x\n", ((cl_ushort *)sourcePixel)[0],
                      ((cl_ushort *)destPixel)[0]);
            break;
        case 3:
            log_error("*{0x%2.2x, 0x%2.2x, 0x%2.2x} vs. "
                      "{0x%2.2x, 0x%2.2x, 0x%2.2x}\n",
                      ((cl_uchar *)sourcePixel)[0],
                      ((cl_uchar *)sourcePixel)[1],
                      ((cl_uchar *)sourcePixel)[2], ((cl_uchar *)destPixel)[0],
                      ((cl_uchar *)destPixel)[1], ((cl_uchar *)destPixel)[2]);
            break;
        case 4:
            log_error("*0x%8.8x vs. 0x%8.8x\n", ((cl_uint *)sourcePixel)[0],
                      ((cl_uint *)destPixel)[0]);
            break;
        case 6:
            log_error(
                "*{0x%4.4x, 0x%4.4x, 0x%4.4x} vs. "
                "{0x%4.4x, 0x%4.4x, 0x%4.4x}\n",
                ((cl_ushort *)sourcePixel)[0], ((cl_ushort *)sourcePixel)[1],
                ((cl_ushort *)sourcePixel)[2], ((cl_ushort *)destPixel)[0],
                ((cl_ushort *)destPixel)[1], ((cl_ushort *)destPixel)[2]);
            break;
        case 8:
            log_error("*0x%16.16" PRIx64 " vs. 0x%16.16" PRIx64 "\n",
                      ((cl_ulong *)sourcePixel)[0], ((cl_ulong *)destPixel)[0]);
            break;
        case 12:
            log_error("*{0x%8.8x, 0x%8.8x, 0x%8.8x} vs. "
                      "{0x%8.8x, 0x%8.8x, 0x%8.8x}\n",
                      ((cl_uint *)sourcePixel)[0], ((cl_uint *)sourcePixel)[1],
                      ((cl_uint *)sourcePixel)[2], ((cl_uint *)destPixel)[0],
                      ((cl_uint *)destPixel)[1], ((cl_uint *)destPixel)[2]);
            break;
        case 16:
            log_error("*{0x%8.8x, 0x%8.8x, 0x%8.8x, 0x%8.8x} vs. "
                      "{0x%8.8x, 0x%8.8x, 0x%8.8x, 0x%8.8x}\n",
                      ((cl_uint *)sourcePixel)[0], ((cl_uint *)sourcePixel)[1],
                      ((cl_uint *)sourcePixel)[2], ((cl_uint *)sourcePixel)[3],
                      ((cl_uint *)destPixel)[0], ((cl_uint *)destPixel)[1],
                      ((cl_uint *)destPixel)[2], ((cl_uint *)destPixel)[3]);
            break;
        default:
            log_error("Don't know how to print pixel size of %zu\n",
                      pixel_size);
            break;
    }
}

size_t compare_scanlines(const image_descriptor *imageInfo, const char *aPtr,
                         const char *bPtr)
{
    size_t pixel_size = get_pixel_size(imageInfo->format);
    size_t column;

    for (column = 0; column < imageInfo->width; column++)
    {
        switch (imageInfo->format->image_channel_data_type)
        {
            // If the data type is 101010, then ignore bits 31 and 32 when
            // comparing the row
            case CL_UNORM_INT_101010: {
                cl_uint aPixel = *(cl_uint *)aPtr;
                cl_uint bPixel = *(cl_uint *)bPtr;
                if ((aPixel & 0x3fffffff) != (bPixel & 0x3fffffff))
                    return column;
            }
            break;

            // If the data type is 555, ignore bit 15 when comparing the row
            case CL_UNORM_SHORT_555: {
                cl_ushort aPixel = *(cl_ushort *)aPtr;
                cl_ushort bPixel = *(cl_ushort *)bPtr;
                if ((aPixel & 0x7fff) != (bPixel & 0x7fff)) return column;
            }
            break;

            default:
                if (memcmp(aPtr, bPtr, pixel_size) != 0) return column;
                break;
        }

        aPtr += pixel_size;
        bPtr += pixel_size;
    }

    // If we didn't find a difference, return the width of the image
    return column;
}

int random_log_in_range(int minV, int maxV, MTdata d)
{
    double v = log2(((double)genrand_int32(d) / (double)0xffffffff) + 1);
    int iv = (int)((float)(maxV - minV) * v);
    return iv + minV;
}


// Define the addressing functions
typedef int (*AddressFn)(int value, size_t maxValue);

int NoAddressFn(int value, size_t maxValue) { return value; }
int RepeatAddressFn(int value, size_t maxValue)
{
    if (value < 0)
        value += (int)maxValue;
    else if (value >= (int)maxValue)
        value -= (int)maxValue;
    return value;
}
int MirroredRepeatAddressFn(int value, size_t maxValue)
{
    if (value < 0)
        value = 0;
    else if ((size_t)value >= maxValue)
        value = (int)(maxValue - 1);
    return value;
}
int ClampAddressFn(int value, size_t maxValue)
{
    return (value < -1) ? -1
                        : ((value > (cl_long)maxValue) ? (int)maxValue : value);
}
int ClampToEdgeNearestFn(int value, size_t maxValue)
{
    return (value < 0)
        ? 0
        : (((size_t)value > maxValue - 1) ? (int)maxValue - 1 : value);
}
AddressFn ClampToEdgeLinearFn = ClampToEdgeNearestFn;

// Note: normalized coords get repeated in normalized space, not unnormalized
// space! hence the special case here
volatile float gFloatHome;
float RepeatNormalizedAddressFn(float fValue, size_t maxValue)
{
#ifndef _MSC_VER // Use original if not the VS compiler.
    // General computation for repeat
    return (fValue - floorf(fValue)) * (float)maxValue; // Reduce to [0, 1.f]
#else // Otherwise, use this instead:
    // Home the subtraction to a float to break up the sequence of x87
    // instructions emitted by the VS compiler.
    gFloatHome = fValue - floorf(fValue);
    return gFloatHome * (float)maxValue;
#endif
}

float MirroredRepeatNormalizedAddressFn(float fValue, size_t maxValue)
{
    // Round to nearest multiple of two.
    // Note halfway values flip flop here due to rte, but they both end up
    // pointing the same place at the end of the day.
    float s_prime = 2.0f * rintf(fValue * 0.5f);

    // Reduce to [-1, 1], Apply mirroring -> [0, 1]
    s_prime = fabsf(fValue - s_prime);

    // un-normalize
    return s_prime * (float)maxValue;
}

struct AddressingTable
{
    AddressingTable()
    {
        static_assert(CL_ADDRESS_MIRRORED_REPEAT - CL_ADDRESS_NONE < 6, "");
        static_assert(CL_FILTER_NEAREST - CL_FILTER_LINEAR < 2, "");

        mTable[CL_ADDRESS_NONE - CL_ADDRESS_NONE]
              [CL_FILTER_NEAREST - CL_FILTER_NEAREST] = NoAddressFn;
        mTable[CL_ADDRESS_NONE - CL_ADDRESS_NONE]
              [CL_FILTER_LINEAR - CL_FILTER_NEAREST] = NoAddressFn;
        mTable[CL_ADDRESS_REPEAT - CL_ADDRESS_NONE]
              [CL_FILTER_NEAREST - CL_FILTER_NEAREST] = RepeatAddressFn;
        mTable[CL_ADDRESS_REPEAT - CL_ADDRESS_NONE]
              [CL_FILTER_LINEAR - CL_FILTER_NEAREST] = RepeatAddressFn;
        mTable[CL_ADDRESS_CLAMP_TO_EDGE - CL_ADDRESS_NONE]
              [CL_FILTER_NEAREST - CL_FILTER_NEAREST] = ClampToEdgeNearestFn;
        mTable[CL_ADDRESS_CLAMP_TO_EDGE - CL_ADDRESS_NONE]
              [CL_FILTER_LINEAR - CL_FILTER_NEAREST] = ClampToEdgeLinearFn;
        mTable[CL_ADDRESS_CLAMP - CL_ADDRESS_NONE]
              [CL_FILTER_NEAREST - CL_FILTER_NEAREST] = ClampAddressFn;
        mTable[CL_ADDRESS_CLAMP - CL_ADDRESS_NONE]
              [CL_FILTER_LINEAR - CL_FILTER_NEAREST] = ClampAddressFn;
        mTable[CL_ADDRESS_MIRRORED_REPEAT - CL_ADDRESS_NONE]
              [CL_FILTER_NEAREST - CL_FILTER_NEAREST] = MirroredRepeatAddressFn;
        mTable[CL_ADDRESS_MIRRORED_REPEAT - CL_ADDRESS_NONE]
              [CL_FILTER_LINEAR - CL_FILTER_NEAREST] = MirroredRepeatAddressFn;
    }

    AddressFn operator[](image_sampler_data *sampler)
    {
        return mTable[(int)sampler->addressing_mode - CL_ADDRESS_NONE]
                     [(int)sampler->filter_mode - CL_FILTER_NEAREST];
    }

    AddressFn mTable[6][2];
};

static AddressingTable sAddressingTable;

bool is_sRGBA_order(cl_channel_order image_channel_order)
{
    switch (image_channel_order)
    {
        case CL_sRGB:
        case CL_sRGBx:
        case CL_sRGBA:
        case CL_sBGRA: return true;
        default: return false;
    }
}

// Format helpers

int has_alpha(const cl_image_format *format)
{
    switch (format->image_channel_order)
    {
        case CL_R: return 0;
        case CL_A: return 1;
        case CL_Rx: return 0;
        case CL_RG: return 0;
        case CL_RA: return 1;
        case CL_RGx: return 0;
        case CL_RGB:
        case CL_sRGB: return 0;
        case CL_RGBx:
        case CL_sRGBx: return 0;
        case CL_RGBA: return 1;
        case CL_BGRA: return 1;
        case CL_ARGB: return 1;
        case CL_ABGR: return 1;
        case CL_INTENSITY: return 1;
        case CL_LUMINANCE: return 0;
#ifdef CL_BGR1_APPLE
        case CL_BGR1_APPLE: return 1;
#endif
#ifdef CL_1RGB_APPLE
        case CL_1RGB_APPLE: return 1;
#endif
        case CL_sRGBA:
        case CL_sBGRA: return 1;
        case CL_DEPTH: return 0;
        default:
            log_error("Invalid image channel order: %d\n",
                      format->image_channel_order);
            return 0;
    }
}

#define PRINT_MAX_SIZE_LOGIC 0

#define SWAP(_a, _b)                                                           \
    do                                                                         \
    {                                                                          \
        _a ^= _b;                                                              \
        _b ^= _a;                                                              \
        _a ^= _b;                                                              \
    } while (0)

void get_max_sizes(
    size_t *numberOfSizes, const int maxNumberOfSizes, size_t sizes[][3],
    size_t maxWidth, size_t maxHeight, size_t maxDepth, size_t maxArraySize,
    const cl_ulong maxIndividualAllocSize, // CL_DEVICE_MAX_MEM_ALLOC_SIZE
    const cl_ulong maxTotalAllocSize, // CL_DEVICE_GLOBAL_MEM_SIZE
    cl_mem_object_type image_type, const cl_image_format *format,
    int usingMaxPixelSizeBuffer)
{

    bool is3D = (image_type == CL_MEM_OBJECT_IMAGE3D);
    bool isArray = (image_type == CL_MEM_OBJECT_IMAGE1D_ARRAY
                    || image_type == CL_MEM_OBJECT_IMAGE2D_ARRAY);

    // Validate we have a reasonable max depth for 3D
    if (is3D && maxDepth < 2)
    {
        log_error("ERROR: Requesting max image sizes for 3D images when max "
                  "depth is < 2.\n");
        *numberOfSizes = 0;
        return;
    }
    // Validate we have a reasonable max array size for 1D & 2D image arrays
    if (isArray && maxArraySize < 2)
    {
        log_error("ERROR: Requesting max image sizes for an image array when "
                  "max array size is < 1.\n");
        *numberOfSizes = 0;
        return;
    }

    // Reduce the maximum because we are trying to test the max image
    // dimensions, not the memory allocation
    cl_ulong adjustedMaxTotalAllocSize = maxTotalAllocSize / 4;
    cl_ulong adjustedMaxIndividualAllocSize = maxIndividualAllocSize / 4;
    log_info("Note: max individual allocation adjusted down from %gMB to %gMB "
             "and max total allocation adjusted down from %gMB to %gMB.\n",
             maxIndividualAllocSize / (1024.0 * 1024.0),
             adjustedMaxIndividualAllocSize / (1024.0 * 1024.0),
             maxTotalAllocSize / (1024.0 * 1024.0),
             adjustedMaxTotalAllocSize / (1024.0 * 1024.0));

    // Cap our max allocation to 1.0GB.
    // FIXME -- why?  In the interest of not taking a long time?  We should
    // still test this stuff...
    if (adjustedMaxTotalAllocSize > (cl_ulong)1024 * 1024 * 1024)
    {
        adjustedMaxTotalAllocSize = (cl_ulong)1024 * 1024 * 1024;
        log_info("Limiting max total allocation size to %gMB (down from %gMB) "
                 "for test.\n",
                 adjustedMaxTotalAllocSize / (1024.0 * 1024.0),
                 maxTotalAllocSize / (1024.0 * 1024.0));
    }

    cl_ulong maxAllocSize = adjustedMaxIndividualAllocSize;
    if (adjustedMaxTotalAllocSize < adjustedMaxIndividualAllocSize * 2)
        maxAllocSize = adjustedMaxTotalAllocSize / 2;

    size_t raw_pixel_size = get_pixel_size(format);
    // If the test will be creating input (src) buffer of type int4 or float4,
    // number of pixels will be governed by sizeof(int4 or float4) and not
    // sizeof(dest fomat) Also if pixel size is 12 bytes i.e. RGB or RGBx, we
    // adjust it to 16 bytes as GPUs has no concept of 3 channel images. GPUs
    // expand these to four channel RGBA.
    if (usingMaxPixelSizeBuffer || raw_pixel_size == 12) raw_pixel_size = 16;
    size_t max_pixels = (size_t)maxAllocSize / raw_pixel_size;

    log_info("Maximums: [%zu x %zu x %zu], raw pixel size %zu bytes, "
             "per-allocation limit %gMB.\n",
             maxWidth, maxHeight, isArray ? maxArraySize : maxDepth,
             raw_pixel_size, (maxAllocSize / (1024.0 * 1024.0)));

    // Keep track of the maximum sizes for each dimension
    size_t maximum_sizes[] = { maxWidth, maxHeight, maxDepth };

    switch (image_type)
    {
        case CL_MEM_OBJECT_IMAGE1D_ARRAY:
            maximum_sizes[1] = maxArraySize;
            maximum_sizes[2] = 1;
            break;
        case CL_MEM_OBJECT_IMAGE2D_ARRAY:
            maximum_sizes[2] = maxArraySize;
            break;
    }


        // Given one fixed sized dimension, this code finds one or two other
        // dimensions, both with very small size, such that the size does not
        // exceed the maximum passed to this function

#if defined(__x86_64) || defined(__arm64__) || defined(__ppc64__)
    size_t other_sizes[] = { 2, 3, 5, 6, 7, 9, 10, 11, 13, 15 };
#else
    size_t other_sizes[] = { 2, 3, 5, 6, 7, 9, 11, 13 };
#endif

    static size_t other_size = 0;
    enum
    {
        num_other_sizes = sizeof(other_sizes) / sizeof(size_t)
    };

    (*numberOfSizes) = 0;

    if (image_type == CL_MEM_OBJECT_IMAGE1D)
    {

        size_t M = maximum_sizes[0];

        // Store the size
        sizes[(*numberOfSizes)][0] = M;
        sizes[(*numberOfSizes)][1] = 1;
        sizes[(*numberOfSizes)][2] = 1;
        ++(*numberOfSizes);
    }

    else if (image_type == CL_MEM_OBJECT_IMAGE1D_ARRAY
             || image_type == CL_MEM_OBJECT_IMAGE2D)
    {

        for (int fixed_dim = 0; fixed_dim < 2; ++fixed_dim)
        {

            // Determine the size of the fixed dimension
            size_t M = maximum_sizes[fixed_dim];
            size_t A = max_pixels;

            int x0_dim = !fixed_dim;
            size_t x0 = static_cast<size_t>(
                fmin(fmin(other_sizes[(other_size++) % num_other_sizes], A / M),
                     maximum_sizes[x0_dim]));

            // Store the size
            sizes[(*numberOfSizes)][fixed_dim] = M;
            sizes[(*numberOfSizes)][x0_dim] = x0;
            sizes[(*numberOfSizes)][2] = 1;
            ++(*numberOfSizes);
        }
    }

    else if (image_type == CL_MEM_OBJECT_IMAGE2D_ARRAY
             || image_type == CL_MEM_OBJECT_IMAGE3D)
    {

        // Iterate over dimensions, finding sizes for the non-fixed dimension
        for (int fixed_dim = 0; fixed_dim < 3; ++fixed_dim)
        {

            // Determine the size of the fixed dimension
            size_t M = maximum_sizes[fixed_dim];
            size_t A = max_pixels;

            // Find two other dimensions, x0 and x1
            int x0_dim = (fixed_dim == 0) ? 1 : 0;
            int x1_dim = (fixed_dim == 2) ? 1 : 2;

            // Choose two other sizes for these dimensions
            size_t x0 = static_cast<size_t>(
                fmin(fmin(A / M, maximum_sizes[x0_dim]),
                     other_sizes[(other_size++) % num_other_sizes]));
            // GPUs have certain restrictions on minimum width (row alignment)
            // of images which has given us issues testing small widths in this
            // test (say we set width to 3 for testing, and compute size based
            // on this width and decide it fits within vram ... but GPU driver
            // decides that, due to row alignment requirements, it has to use
            // width of 16 which doesnt fit in vram). For this purpose we are
            // not testing width < 16 for this test.
            if (x0_dim == 0 && x0 < 16) x0 = 16;
            size_t x1 = static_cast<size_t>(
                fmin(fmin(A / M / x0, maximum_sizes[x1_dim]),
                     other_sizes[(other_size++) % num_other_sizes]));

            // Valid image sizes cannot be below 1. Due to the workaround for
            // the xo_dim where x0 is overidden to 16 there might not be enough
            // space left for x1 dimension. This could be a fractional 0.x size
            // that when cast to integer would result in a value 0. In these
            // cases we clamp the size to a minimum of 1.
            if (x1 < 1) x1 = 1;

            // M and x0 cannot be '0' as they derive from clDeviceInfo calls
            assert(x0 > 0 && M > 0);

            // Store the size
            sizes[(*numberOfSizes)][fixed_dim] = M;
            sizes[(*numberOfSizes)][x0_dim] = x0;
            sizes[(*numberOfSizes)][x1_dim] = x1;
            ++(*numberOfSizes);
        }
    }

    // Log the results
    for (int j = 0; j < (int)(*numberOfSizes); j++)
    {
        switch (image_type)
        {
            case CL_MEM_OBJECT_IMAGE1D:
                log_info(" size[%d] = [%zu] (%g MB image)\n", j, sizes[j][0],
                         raw_pixel_size * sizes[j][0] * sizes[j][1]
                             * sizes[j][2] / (1024.0 * 1024.0));
                break;
            case CL_MEM_OBJECT_IMAGE1D_ARRAY:
            case CL_MEM_OBJECT_IMAGE2D:
                log_info(" size[%d] = [%zu %zu] (%g MB image)\n", j,
                         sizes[j][0], sizes[j][1],
                         raw_pixel_size * sizes[j][0] * sizes[j][1]
                             * sizes[j][2] / (1024.0 * 1024.0));
                break;
            case CL_MEM_OBJECT_IMAGE2D_ARRAY:
            case CL_MEM_OBJECT_IMAGE3D:
                log_info(" size[%d] = [%zu %zu %zu] (%g MB image)\n", j,
                         sizes[j][0], sizes[j][1], sizes[j][2],
                         raw_pixel_size * sizes[j][0] * sizes[j][1]
                             * sizes[j][2] / (1024.0 * 1024.0));
                break;
        }
    }
}

float get_max_absolute_error(const cl_image_format *format,
                             image_sampler_data *sampler)
{
    if (sampler->filter_mode == CL_FILTER_NEAREST) return 0.0f;

    switch (format->image_channel_data_type)
    {
        case CL_SNORM_INT8: return 1.0f / 127.0f;
        case CL_UNORM_INT8: return 1.0f / 255.0f;
        case CL_UNORM_INT16: return 1.0f / 65535.0f;
        case CL_SNORM_INT16: return 1.0f / 32767.0f;
        case CL_FLOAT: return CL_FLT_MIN;
#ifdef CL_SFIXED14_APPLE
        case CL_SFIXED14_APPLE: return 0x1.0p-14f;
#endif
        case CL_UNORM_SHORT_555:
        case CL_UNORM_SHORT_565: return 1.0f / 31.0f;
        default: return 0.0f;
    }
}

float get_max_relative_error(const cl_image_format *format,
                             image_sampler_data *sampler, int is3D,
                             int isLinearFilter)
{
    float maxError = 0.0f;
    float sampleCount = 1.0f;
    if (isLinearFilter) sampleCount = is3D ? 8.0f : 4.0f;

    // Note that the ULP is defined here as the unit in the last place of the
    // maximum magnitude sample used for filtering.

    // Section 8.3
    switch (format->image_channel_data_type)
    {
        // The spec allows 2 ulps of error for normalized formats
        case CL_SNORM_INT8:
        case CL_UNORM_INT8:
        case CL_SNORM_INT16:
        case CL_UNORM_INT16:
        case CL_UNORM_SHORT_565:
        case CL_UNORM_SHORT_555:
        case CL_UNORM_INT_101010:
            // Maximum sampling error for round to zero normalization based on
            // multiplication by reciprocal (using reciprocal generated in
            // round to +inf mode, so that 1.0 matches spec)
            maxError = 2 * FLT_EPSILON * sampleCount;
            break;

            // If the implementation supports these formats then it will have to
            // allow rounding error here too, because not all 32-bit ints are
            // exactly representable in float
        case CL_SIGNED_INT32:
        case CL_UNSIGNED_INT32: maxError = 1 * FLT_EPSILON; break;
    }


    // Section 8.2
    if (sampler->addressing_mode == CL_ADDRESS_REPEAT
        || sampler->addressing_mode == CL_ADDRESS_MIRRORED_REPEAT
        || sampler->filter_mode != CL_FILTER_NEAREST
        || sampler->normalized_coords)
#if defined(__APPLE__)
    {
        if (sampler->filter_mode != CL_FILTER_NEAREST)
        {
            // The maximum
            if (gDeviceType == CL_DEVICE_TYPE_GPU)
                // Some GPUs ain't so accurate
                maxError += MAKE_HEX_FLOAT(0x1.0p-4f, 0x1L, -4);
            else
                // The standard method of 2d linear filtering delivers 4.0 ulps
                // of error in round to nearest (8 in rtz).
                maxError += 4.0f * FLT_EPSILON;
        }
        else
            // normalized coordinates will introduce some error into the
            // fractional part of the address, affecting results
            maxError += 4.0f * FLT_EPSILON;
    }
#else
    {
#if !defined(_WIN32)
#warning Implementations will likely wish to pick a max allowable sampling error policy here that is better than the spec
#endif
        // The spec allows linear filters to return any result most of the time.
        // That's fine for implementations but a problem for testing. After all
        // users aren't going to like garbage images.  We have "picked a number"
        // here that we are going to attempt to conform to. Implementations are
        // free to pick another number, like infinity, if they like.
        // We picked a number for you, to provide /some/ sanity
        maxError = MAKE_HEX_FLOAT(0x1.0p-7f, 0x1L, -7);
        // ...but this is what the spec allows:
        // maxError = INFINITY;
        // Please feel free to pick any positive number. (NaN wont work.)
    }
#endif

    // The error calculation itself can introduce error
    maxError += FLT_EPSILON * 2;

    return maxError;
}

size_t get_format_max_int(const cl_image_format *format)
{
    switch (format->image_channel_data_type)
    {
        case CL_SNORM_INT8:
        case CL_SIGNED_INT8: return 127;
        case CL_UNORM_INT8:
        case CL_UNSIGNED_INT8: return 255;

        case CL_SNORM_INT16:
        case CL_SIGNED_INT16: return 32767;

        case CL_UNORM_INT16:
        case CL_UNSIGNED_INT16: return 65535;

        case CL_SIGNED_INT32: return 2147483647L;

        case CL_UNSIGNED_INT32: return 4294967295LL;

        case CL_UNORM_SHORT_565:
        case CL_UNORM_SHORT_555: return 31;

        case CL_UNORM_INT_101010: return 1023;

        case CL_HALF_FLOAT: return 1 << 10;

#ifdef CL_SFIXED14_APPLE
        case CL_SFIXED14_APPLE: return 16384;
#endif
        default: return 0;
    }
}

int get_format_min_int(const cl_image_format *format)
{
    switch (format->image_channel_data_type)
    {
        case CL_SNORM_INT8:
        case CL_SIGNED_INT8: return -128;
        case CL_UNORM_INT8:
        case CL_UNSIGNED_INT8: return 0;

        case CL_SNORM_INT16:
        case CL_SIGNED_INT16: return -32768;

        case CL_UNORM_INT16:
        case CL_UNSIGNED_INT16: return 0;

        case CL_SIGNED_INT32: return -2147483648LL;

        case CL_UNSIGNED_INT32: return 0;

        case CL_UNORM_SHORT_565:
        case CL_UNORM_SHORT_555:
        case CL_UNORM_INT_101010: return 0;

        case CL_HALF_FLOAT: return -(1 << 10);

#ifdef CL_SFIXED14_APPLE
        case CL_SFIXED14_APPLE: return -16384;
#endif

        default: return 0;
    }
}

cl_half convert_float_to_half(float f)
{
    switch (gFloatToHalfRoundingMode)
    {
        case kRoundToNearestEven: return cl_half_from_float(f, CL_HALF_RTE);
        case kRoundTowardZero: return cl_half_from_float(f, CL_HALF_RTZ);
        default:
            log_error("ERROR: Test internal error -- unhandled or unknown "
                      "float->half rounding mode.\n");
            exit(-1);
            return 0xffff;
    }
}

cl_ulong get_image_size(image_descriptor const *imageInfo)
{
    cl_ulong imageSize;

    // Assumes rowPitch and slicePitch are always correctly defined
    if (/*gTestMipmaps*/ imageInfo->num_mip_levels > 1)
    {
        imageSize = (size_t)compute_mipmapped_image_size(*imageInfo);
    }
    else
    {
        switch (imageInfo->type)
        {
            case CL_MEM_OBJECT_IMAGE1D: imageSize = imageInfo->rowPitch; break;
            case CL_MEM_OBJECT_IMAGE2D:
                imageSize = imageInfo->height * imageInfo->rowPitch;
                break;
            case CL_MEM_OBJECT_IMAGE3D:
                imageSize = imageInfo->depth * imageInfo->slicePitch;
                break;
            case CL_MEM_OBJECT_IMAGE1D_ARRAY:
                imageSize = imageInfo->arraySize * imageInfo->slicePitch;
                break;
            case CL_MEM_OBJECT_IMAGE2D_ARRAY:
                imageSize = imageInfo->arraySize * imageInfo->slicePitch;
                break;
            default:
                log_error("ERROR: Cannot identify image type %x\n",
                          imageInfo->type);
                abort();
        }
    }
    return imageSize;
}

// Calculate image size in megabytes (strictly, mebibytes). Result is rounded
// up.
cl_ulong get_image_size_mb(image_descriptor const *imageInfo)
{
    cl_ulong imageSize = get_image_size(imageInfo);
    cl_ulong mb = imageSize / (1024 * 1024);
    if (imageSize % (1024 * 1024) > 0)
    {
        mb += 1;
    }
    return mb;
}


uint64_t gRoundingStartValue = 0;


void escape_inf_nan_values(char *data, size_t allocSize)
{
    // filter values with 8 not-quite-highest bits
    unsigned int *intPtr = (unsigned int *)data;
    for (size_t i = 0; i<allocSize>> 2; i++)
    {
        if ((intPtr[i] & 0x7F800000) == 0x7F800000) intPtr[i] ^= 0x40000000;
    }

    // Ditto with half floats (16-bit numbers with the 5 not-quite-highest bits
    // = 0x7C00 are special)
    unsigned short *shortPtr = (unsigned short *)data;
    for (size_t i = 0; i<allocSize>> 1; i++)
    {
        if ((shortPtr[i] & 0x7C00) == 0x7C00) shortPtr[i] ^= 0x4000;
    }
}

char *generate_random_image_data(image_descriptor *imageInfo,
                                 BufferOwningPtr<char> &P, MTdata d)
{
    size_t allocSize = static_cast<size_t>(get_image_size(imageInfo));
    size_t pixelRowBytes = imageInfo->width * get_pixel_size(imageInfo->format);
    size_t i;

    if (imageInfo->num_mip_levels > 1)
        allocSize =
            static_cast<size_t>(compute_mipmapped_image_size(*imageInfo));

#if defined(__APPLE__)
    char *data = NULL;
    if (gDeviceType == CL_DEVICE_TYPE_CPU)
    {
        size_t mapSize = ((allocSize + 4095L) & -4096L) + 8192;

        void *map = mmap(0, mapSize, PROT_READ | PROT_WRITE,
                         MAP_ANON | MAP_PRIVATE, 0, 0);
        intptr_t data_end = (intptr_t)map + mapSize - 4096;
        data = (char *)(data_end - (intptr_t)allocSize);

        mprotect(map, 4096, PROT_NONE);
        mprotect((void *)((char *)map + mapSize - 4096), 4096, PROT_NONE);
        P.reset(data, map, mapSize, allocSize);
    }
    else
    {
        data = (char *)malloc(allocSize);
        P.reset(data, NULL, 0, allocSize);
    }
#else
    P.reset(NULL); // Free already allocated memory first, then try to allocate
                   // new block.
    char *data =
        (char *)align_malloc(allocSize, get_pixel_alignment(imageInfo->format));
    P.reset(data, NULL, 0, allocSize, true);
#endif

    if (data == NULL)
    {
        log_error("ERROR: Unable to malloc %zu bytes for "
                  "generate_random_image_data\n",
                  allocSize);
        return 0;
    }

    if (gTestRounding)
    {
        // Special case: fill with a ramp from 0 to the size of the type
        size_t typeSize = get_format_type_size(imageInfo->format);
        switch (typeSize)
        {
            case 1: {
                char *ptr = data;
                for (i = 0; i < allocSize; i++)
                    ptr[i] = (cl_char)(i + gRoundingStartValue);
            }
            break;
            case 2: {
                cl_short *ptr = (cl_short *)data;
                for (i = 0; i < allocSize / 2; i++)
                    ptr[i] = (cl_short)(i + gRoundingStartValue);
            }
            break;
            case 4: {
                cl_int *ptr = (cl_int *)data;
                for (i = 0; i < allocSize / 4; i++)
                    ptr[i] = (cl_int)(i + gRoundingStartValue);
            }
            break;
        }

        // Note: inf or nan float values would cause problems, although we don't
        // know this will actually be a float, so we just know what to look for
        escape_inf_nan_values(data, allocSize);
        return data;
    }

    // Otherwise, we should be able to just fill with random bits no matter what
    cl_uint *p = (cl_uint *)data;
    for (i = 0; i + 4 <= allocSize; i += 4) p[i / 4] = genrand_int32(d);

    for (; i < allocSize; i++) data[i] = genrand_int32(d);

    // Note: inf or nan float values would cause problems, although we don't
    // know this will actually be a float, so we just know what to look for
    escape_inf_nan_values(data, allocSize);

    if (/*!gTestMipmaps*/ imageInfo->num_mip_levels < 2)
    {
        // Fill unused edges with -1, NaN for float
        if (imageInfo->rowPitch > pixelRowBytes)
        {
            size_t height = 0;

            switch (imageInfo->type)
            {
                case CL_MEM_OBJECT_IMAGE2D:
                case CL_MEM_OBJECT_IMAGE3D:
                case CL_MEM_OBJECT_IMAGE2D_ARRAY:
                    height = imageInfo->height;
                    break;
                case CL_MEM_OBJECT_IMAGE1D_ARRAY:
                    height = imageInfo->arraySize;
                    break;
            }

            // Fill in the row padding regions
            for (i = 0; i < height; i++)
            {
                size_t offset = i * imageInfo->rowPitch + pixelRowBytes;
                size_t length = imageInfo->rowPitch - pixelRowBytes;
                memset(data + offset, 0xff, length);
            }
        }

        // Fill in the slice padding regions, if necessary:

        size_t slice_dimension = imageInfo->height;
        if (imageInfo->type == CL_MEM_OBJECT_IMAGE1D_ARRAY)
        {
            slice_dimension = imageInfo->arraySize;
        }

        if (imageInfo->slicePitch > slice_dimension * imageInfo->rowPitch)
        {
            size_t depth = 0;
            switch (imageInfo->type)
            {
                case CL_MEM_OBJECT_IMAGE2D:
                case CL_MEM_OBJECT_IMAGE3D: depth = imageInfo->depth; break;
                case CL_MEM_OBJECT_IMAGE1D_ARRAY:
                case CL_MEM_OBJECT_IMAGE2D_ARRAY:
                    depth = imageInfo->arraySize;
                    break;
            }

            for (i = 0; i < depth; i++)
            {
                size_t offset = i * imageInfo->slicePitch
                    + slice_dimension * imageInfo->rowPitch;
                size_t length = imageInfo->slicePitch
                    - slice_dimension * imageInfo->rowPitch;
                memset(data + offset, 0xff, length);
            }
        }
    }

    return data;
}

#define CLAMP_FLOAT(v) (fmaxf(fminf(v, 1.f), -1.f))


void read_image_pixel_float(void *imageData, image_descriptor *imageInfo, int x,
                            int y, int z, float *outData, int lod)
{
    size_t width_lod = imageInfo->width, height_lod = imageInfo->height,
           depth_lod = imageInfo->depth;
    size_t slice_pitch_lod = 0, row_pitch_lod = 0;

    if (imageInfo->num_mip_levels > 1)
    {
        switch (imageInfo->type)
        {
            case CL_MEM_OBJECT_IMAGE3D:
                depth_lod =
                    (imageInfo->depth >> lod) ? (imageInfo->depth >> lod) : 1;
            case CL_MEM_OBJECT_IMAGE2D:
            case CL_MEM_OBJECT_IMAGE2D_ARRAY:
                height_lod =
                    (imageInfo->height >> lod) ? (imageInfo->height >> lod) : 1;
            default:
                width_lod =
                    (imageInfo->width >> lod) ? (imageInfo->width >> lod) : 1;
        }
        row_pitch_lod = width_lod * get_pixel_size(imageInfo->format);
        if (imageInfo->type == CL_MEM_OBJECT_IMAGE1D_ARRAY)
            slice_pitch_lod = row_pitch_lod;
        else if (imageInfo->type == CL_MEM_OBJECT_IMAGE3D
                 || imageInfo->type == CL_MEM_OBJECT_IMAGE2D_ARRAY)
            slice_pitch_lod = row_pitch_lod * height_lod;
    }
    else
    {
        row_pitch_lod = imageInfo->rowPitch;
        slice_pitch_lod = imageInfo->slicePitch;
    }
    if (x < 0 || y < 0 || z < 0 || x >= (int)width_lod
        || (height_lod != 0 && y >= (int)height_lod)
        || (depth_lod != 0 && z >= (int)depth_lod)
        || (imageInfo->arraySize != 0 && z >= (int)imageInfo->arraySize))
    {
        outData[0] = outData[1] = outData[2] = outData[3] = 0;
        if (!has_alpha(imageInfo->format)) outData[3] = 1;
        return;
    }

    const cl_image_format *format = imageInfo->format;

    unsigned int i;
    float tempData[4];

    // Advance to the right spot
    char *ptr = (char *)imageData;
    size_t pixelSize = get_pixel_size(format);

    ptr += z * slice_pitch_lod + y * row_pitch_lod + x * pixelSize;

    // OpenCL only supports reading floats from certain formats
    size_t channelCount = get_format_channel_count(format);
    switch (format->image_channel_data_type)
    {
        case CL_SNORM_INT8: {
            cl_char *dPtr = (cl_char *)ptr;
            for (i = 0; i < channelCount; i++)
                tempData[i] = CLAMP_FLOAT((float)dPtr[i] / 127.0f);
            break;
        }

        case CL_UNORM_INT8: {
            unsigned char *dPtr = (unsigned char *)ptr;
            for (i = 0; i < channelCount; i++)
            {
                if ((is_sRGBA_order(imageInfo->format->image_channel_order))
                    && i < 3) // only RGB need to be converted for sRGBA
                    tempData[i] = (float)sRGBunmap((float)dPtr[i] / 255.0f);
                else
                    tempData[i] = (float)dPtr[i] / 255.0f;
            }
            break;
        }

        case CL_SIGNED_INT8: {
            cl_char *dPtr = (cl_char *)ptr;
            for (i = 0; i < channelCount; i++) tempData[i] = (float)dPtr[i];
            break;
        }

        case CL_UNSIGNED_INT8: {
            cl_uchar *dPtr = (cl_uchar *)ptr;
            for (i = 0; i < channelCount; i++) tempData[i] = (float)dPtr[i];
            break;
        }

        case CL_SNORM_INT16: {
            cl_short *dPtr = (cl_short *)ptr;
            for (i = 0; i < channelCount; i++)
                tempData[i] = CLAMP_FLOAT((float)dPtr[i] / 32767.0f);
            break;
        }

        case CL_UNORM_INT16: {
            cl_ushort *dPtr = (cl_ushort *)ptr;
            for (i = 0; i < channelCount; i++)
                tempData[i] = (float)dPtr[i] / 65535.0f;
            break;
        }

        case CL_SIGNED_INT16: {
            cl_short *dPtr = (cl_short *)ptr;
            for (i = 0; i < channelCount; i++) tempData[i] = (float)dPtr[i];
            break;
        }

        case CL_UNSIGNED_INT16: {
            cl_ushort *dPtr = (cl_ushort *)ptr;
            for (i = 0; i < channelCount; i++) tempData[i] = (float)dPtr[i];
            break;
        }

        case CL_HALF_FLOAT: {
            cl_half *dPtr = (cl_half *)ptr;
            for (i = 0; i < channelCount; i++)
                tempData[i] = cl_half_to_float(dPtr[i]);
            break;
        }

        case CL_SIGNED_INT32: {
            cl_int *dPtr = (cl_int *)ptr;
            for (i = 0; i < channelCount; i++) tempData[i] = (float)dPtr[i];
            break;
        }

        case CL_UNSIGNED_INT32: {
            cl_uint *dPtr = (cl_uint *)ptr;
            for (i = 0; i < channelCount; i++) tempData[i] = (float)dPtr[i];
            break;
        }

        case CL_UNORM_SHORT_565: {
            cl_ushort *dPtr = (cl_ushort *)ptr;
            tempData[0] = (float)(dPtr[0] >> 11) / (float)31;
            tempData[1] = (float)((dPtr[0] >> 5) & 63) / (float)63;
            tempData[2] = (float)(dPtr[0] & 31) / (float)31;
            break;
        }

        case CL_UNORM_SHORT_555: {
            cl_ushort *dPtr = (cl_ushort *)ptr;
            tempData[0] = (float)((dPtr[0] >> 10) & 31) / (float)31;
            tempData[1] = (float)((dPtr[0] >> 5) & 31) / (float)31;
            tempData[2] = (float)(dPtr[0] & 31) / (float)31;
            break;
        }

        case CL_UNORM_INT_101010: {
            cl_uint *dPtr = (cl_uint *)ptr;
            tempData[0] = (float)((dPtr[0] >> 20) & 0x3ff) / (float)1023;
            tempData[1] = (float)((dPtr[0] >> 10) & 0x3ff) / (float)1023;
            tempData[2] = (float)(dPtr[0] & 0x3ff) / (float)1023;
            break;
        }

        case CL_FLOAT: {
            float *dPtr = (float *)ptr;
            for (i = 0; i < channelCount; i++) tempData[i] = (float)dPtr[i];
            break;
        }
#ifdef CL_SFIXED14_APPLE
        case CL_SFIXED14_APPLE: {
            cl_ushort *dPtr = (cl_ushort *)ptr;
            for (i = 0; i < channelCount; i++)
                tempData[i] = ((int)dPtr[i] - 16384) * 0x1.0p-14f;
            break;
        }
#endif
    }


    outData[0] = outData[1] = outData[2] = 0;
    outData[3] = 1;

    switch (format->image_channel_order)
    {
        case CL_A: outData[3] = tempData[0]; break;
        case CL_R:
        case CL_Rx: outData[0] = tempData[0]; break;
        case CL_RA:
            outData[0] = tempData[0];
            outData[3] = tempData[1];
            break;
        case CL_RG:
        case CL_RGx:
            outData[0] = tempData[0];
            outData[1] = tempData[1];
            break;
        case CL_RGB:
        case CL_RGBx:
        case CL_sRGB:
        case CL_sRGBx:
            outData[0] = tempData[0];
            outData[1] = tempData[1];
            outData[2] = tempData[2];
            break;
        case CL_RGBA:
            outData[0] = tempData[0];
            outData[1] = tempData[1];
            outData[2] = tempData[2];
            outData[3] = tempData[3];
            break;
        case CL_ARGB:
            outData[0] = tempData[1];
            outData[1] = tempData[2];
            outData[2] = tempData[3];
            outData[3] = tempData[0];
            break;
        case CL_ABGR:
            outData[0] = tempData[3];
            outData[1] = tempData[2];
            outData[2] = tempData[1];
            outData[3] = tempData[0];
            break;
        case CL_BGRA:
        case CL_sBGRA:
            outData[0] = tempData[2];
            outData[1] = tempData[1];
            outData[2] = tempData[0];
            outData[3] = tempData[3];
            break;
        case CL_INTENSITY:
            outData[0] = tempData[0];
            outData[1] = tempData[0];
            outData[2] = tempData[0];
            outData[3] = tempData[0];
            break;
        case CL_LUMINANCE:
            outData[0] = tempData[0];
            outData[1] = tempData[0];
            outData[2] = tempData[0];
            break;
#ifdef CL_1RGB_APPLE
        case CL_1RGB_APPLE:
            outData[0] = tempData[1];
            outData[1] = tempData[2];
            outData[2] = tempData[3];
            outData[3] = 1.0f;
            break;
#endif
#ifdef CL_BGR1_APPLE
        case CL_BGR1_APPLE:
            outData[0] = tempData[2];
            outData[1] = tempData[1];
            outData[2] = tempData[0];
            outData[3] = 1.0f;
            break;
#endif
        case CL_sRGBA:
            outData[0] = tempData[0];
            outData[1] = tempData[1];
            outData[2] = tempData[2];
            outData[3] = tempData[3];
            break;
        case CL_DEPTH: outData[0] = tempData[0]; break;
        default:
            log_error("Invalid format:");
            print_header(format, true);
            break;
    }
}

void read_image_pixel_float(void *imageData, image_descriptor *imageInfo, int x,
                            int y, int z, float *outData)
{
    read_image_pixel_float(imageData, imageInfo, x, y, z, outData, 0);
}

bool get_integer_coords(float x, float y, float z, size_t width, size_t height,
                        size_t depth, image_sampler_data *imageSampler,
                        image_descriptor *imageInfo, int &outX, int &outY,
                        int &outZ)
{
    return get_integer_coords_offset(x, y, z, 0.0f, 0.0f, 0.0f, width, height,
                                     depth, imageSampler, imageInfo, outX, outY,
                                     outZ);
}

bool get_integer_coords_offset(float x, float y, float z, float xAddressOffset,
                               float yAddressOffset, float zAddressOffset,
                               size_t width, size_t height, size_t depth,
                               image_sampler_data *imageSampler,
                               image_descriptor *imageInfo, int &outX,
                               int &outY, int &outZ)
{
    AddressFn adFn = sAddressingTable[imageSampler];

    float refX = floorf(x), refY = floorf(y), refZ = floorf(z);

    // Handle sampler-directed coordinate normalization + clamping.  Note that
    // the array coordinate for image array types is expected to be
    // unnormalized, and is clamped to 0..arraySize-1.
    if (imageSampler->normalized_coords)
    {
        switch (imageSampler->addressing_mode)
        {
            case CL_ADDRESS_REPEAT:
                x = RepeatNormalizedAddressFn(x, width);
                if (height != 0)
                {
                    if (imageInfo->type != CL_MEM_OBJECT_IMAGE1D_ARRAY)
                        y = RepeatNormalizedAddressFn(y, height);
                }
                if (depth != 0)
                {
                    if (imageInfo->type != CL_MEM_OBJECT_IMAGE2D_ARRAY)
                        z = RepeatNormalizedAddressFn(z, depth);
                }

                if (xAddressOffset != 0.0)
                {
                    // Add in the offset
                    x += xAddressOffset;
                    // Handle wrapping
                    if (x > width) x -= (float)width;
                    if (x < 0) x += (float)width;
                }
                if ((yAddressOffset != 0.0)
                    && (imageInfo->type != CL_MEM_OBJECT_IMAGE1D_ARRAY))
                {
                    // Add in the offset
                    y += yAddressOffset;
                    // Handle wrapping
                    if (y > height) y -= (float)height;
                    if (y < 0) y += (float)height;
                }
                if ((zAddressOffset != 0.0)
                    && (imageInfo->type != CL_MEM_OBJECT_IMAGE2D_ARRAY))
                {
                    // Add in the offset
                    z += zAddressOffset;
                    // Handle wrapping
                    if (z > depth) z -= (float)depth;
                    if (z < 0) z += (float)depth;
                }
                break;

            case CL_ADDRESS_MIRRORED_REPEAT:
                x = MirroredRepeatNormalizedAddressFn(x, width);
                if (height != 0)
                {
                    if (imageInfo->type != CL_MEM_OBJECT_IMAGE1D_ARRAY)
                        y = MirroredRepeatNormalizedAddressFn(y, height);
                }
                if (depth != 0)
                {
                    if (imageInfo->type != CL_MEM_OBJECT_IMAGE2D_ARRAY)
                        z = MirroredRepeatNormalizedAddressFn(z, depth);
                }

                if (xAddressOffset != 0.0)
                {
                    float temp = x + xAddressOffset;
                    if (temp > (float)width)
                        temp = (float)width - (temp - (float)width);
                    x = fabsf(temp);
                }
                if ((yAddressOffset != 0.0)
                    && (imageInfo->type != CL_MEM_OBJECT_IMAGE1D_ARRAY))
                {
                    float temp = y + yAddressOffset;
                    if (temp > (float)height)
                        temp = (float)height - (temp - (float)height);
                    y = fabsf(temp);
                }
                if ((zAddressOffset != 0.0)
                    && (imageInfo->type != CL_MEM_OBJECT_IMAGE2D_ARRAY))
                {
                    float temp = z + zAddressOffset;
                    if (temp > (float)depth)
                        temp = (float)depth - (temp - (float)depth);
                    z = fabsf(temp);
                }
                break;

            default:
                // Also, remultiply to the original coords. This simulates any
                // truncation in the pass to OpenCL
                x *= (float)width;
                x += xAddressOffset;

                if (imageInfo->type != CL_MEM_OBJECT_IMAGE1D_ARRAY)
                {
                    y *= (float)height;
                    y += yAddressOffset;
                }

                if (imageInfo->type != CL_MEM_OBJECT_IMAGE2D_ARRAY)
                {
                    z *= (float)depth;
                    z += zAddressOffset;
                }
                break;
        }
    }

    // At this point, we're dealing with non-normalized coordinates.

    outX = adFn(static_cast<int>(floorf(x)), width);

    // 1D and 2D arrays require special care for the index coordinate:

    switch (imageInfo->type)
    {
        case CL_MEM_OBJECT_IMAGE1D_ARRAY:
            outY = static_cast<int>(
                calculate_array_index(y, (float)imageInfo->arraySize - 1.0f));
            outZ = 0; /* don't care! */
            break;
        case CL_MEM_OBJECT_IMAGE2D_ARRAY:
            outY = adFn(static_cast<int>(floorf(y)), height);
            outZ = static_cast<int>(
                calculate_array_index(z, (float)imageInfo->arraySize - 1.0f));
            break;
        default:
            // legacy path:
            if (height != 0) outY = adFn(static_cast<int>(floorf(y)), height);
            if (depth != 0) outZ = adFn(static_cast<int>(floorf(z)), depth);
    }

    return !((int)refX == outX && (int)refY == outY && (int)refZ == outZ);
}

static float frac(float a) { return a - floorf(a); }

static inline void pixelMax(const float a[4], const float b[4], float *results);
static inline void pixelMax(const float a[4], const float b[4], float *results)
{
    for (int i = 0; i < 4; i++) results[i] = errMax(fabsf(a[i]), fabsf(b[i]));
}

// If containsDenorms is NULL, flush denorms to zero
// if containsDenorms is not NULL, record whether there are any denorms
static inline void check_for_denorms(float a[4], int *containsDenorms);
static inline void check_for_denorms(float a[4], int *containsDenorms)
{
    if (NULL == containsDenorms)
    {
        for (int i = 0; i < 4; i++)
        {
            if (IsFloatSubnormal(a[i])) a[i] = copysignf(0.0f, a[i]);
        }
    }
    else
    {
        for (int i = 0; i < 4; i++)
        {
            if (IsFloatSubnormal(a[i]))
            {
                *containsDenorms = 1;
                break;
            }
        }
    }
}

inline float calculate_array_index(float coord, float extent)
{
    // from Section 8.4 of the 1.2 Spec 'Selecting an Image from an Image Array'
    //
    // given coordinate 'w' that represents an index:
    // layer_index = clamp( rint(w), 0, image_array_size - 1)

    float ret = rintf(coord);
    ret = ret > extent ? extent : ret;
    ret = ret < 0.0f ? 0.0f : ret;

    return ret;
}

/*
 * Utility function to unnormalized a coordinate given a particular sampler.
 *
 * name     - the name of the coordinate, used for verbose debugging only
 * coord    - the coordinate requiring unnormalization
 * offset   - an addressing offset to be added to the coordinate
 * extent   - the max value for this coordinate (e.g. width for x)
 */
static float unnormalize_coordinate(const char *name, float coord, float offset,
                                    float extent,
                                    cl_addressing_mode addressing_mode,
                                    int verbose)
{
    float ret = 0.0f;

    switch (addressing_mode)
    {
        case CL_ADDRESS_REPEAT:
            ret = RepeatNormalizedAddressFn(coord, static_cast<size_t>(extent));

            if (verbose)
            {
                log_info("\tRepeat filter denormalizes %s (%f) to %f\n", name,
                         coord, ret);
            }

            if (offset != 0.0)
            {
                // Add in the offset, and handle wrapping.
                ret += offset;
                if (ret > extent) ret -= extent;
                if (ret < 0.0) ret += extent;
            }

            if (verbose && offset != 0.0f)
            {
                log_info("\tAddress offset of %f added to get %f\n", offset,
                         ret);
            }
            break;

        case CL_ADDRESS_MIRRORED_REPEAT:
            ret = MirroredRepeatNormalizedAddressFn(
                coord, static_cast<size_t>(extent));

            if (verbose)
            {
                log_info(
                    "\tMirrored repeat filter denormalizes %s (%f) to %f\n",
                    name, coord, ret);
            }

            if (offset != 0.0)
            {
                float temp = ret + offset;
                if (temp > extent) temp = extent - (temp - extent);
                ret = fabsf(temp);
            }

            if (verbose && offset != 0.0f)
            {
                log_info("\tAddress offset of %f added to get %f\n", offset,
                         ret);
            }
            break;

        default:

            ret = coord * extent;

            if (verbose)
            {
                log_info("\tFilter denormalizes %s to %f (%f * %f)\n", name,
                         ret, coord, extent);
            }

            ret += offset;

            if (verbose && offset != 0.0f)
            {
                log_info("\tAddress offset of %f added to get %f\n", offset,
                         ret);
            }
    }

    return ret;
}

FloatPixel
sample_image_pixel_float(void *imageData, image_descriptor *imageInfo, float x,
                         float y, float z, image_sampler_data *imageSampler,
                         float *outData, int verbose, int *containsDenorms)
{
    return sample_image_pixel_float_offset(imageData, imageInfo, x, y, z, 0.0f,
                                           0.0f, 0.0f, imageSampler, outData,
                                           verbose, containsDenorms);
}

// returns max pixel value of the pixels touched
FloatPixel sample_image_pixel_float(void *imageData,
                                    image_descriptor *imageInfo, float x,
                                    float y, float z,
                                    image_sampler_data *imageSampler,
                                    float *outData, int verbose,
                                    int *containsDenorms, int lod)
{
    return sample_image_pixel_float_offset(imageData, imageInfo, x, y, z, 0.0f,
                                           0.0f, 0.0f, imageSampler, outData,
                                           verbose, containsDenorms, lod);
}
FloatPixel sample_image_pixel_float_offset(
    void *imageData, image_descriptor *imageInfo, float x, float y, float z,
    float xAddressOffset, float yAddressOffset, float zAddressOffset,
    image_sampler_data *imageSampler, float *outData, int verbose,
    int *containsDenorms, int lod)
{
    AddressFn adFn = sAddressingTable[imageSampler];
    FloatPixel returnVal;
    size_t width_lod = imageInfo->width, height_lod = imageInfo->height,
           depth_lod = imageInfo->depth;
    size_t slice_pitch_lod = 0, row_pitch_lod = 0;

    if (imageInfo->num_mip_levels > 1)
    {
        switch (imageInfo->type)
        {
            case CL_MEM_OBJECT_IMAGE3D:
                depth_lod =
                    (imageInfo->depth >> lod) ? (imageInfo->depth >> lod) : 1;
            case CL_MEM_OBJECT_IMAGE2D:
            case CL_MEM_OBJECT_IMAGE2D_ARRAY:
                height_lod =
                    (imageInfo->height >> lod) ? (imageInfo->height >> lod) : 1;
            default:
                width_lod =
                    (imageInfo->width >> lod) ? (imageInfo->width >> lod) : 1;
        }
        row_pitch_lod = width_lod * get_pixel_size(imageInfo->format);
        if (imageInfo->type == CL_MEM_OBJECT_IMAGE1D_ARRAY)
            slice_pitch_lod = row_pitch_lod;
        else if (imageInfo->type == CL_MEM_OBJECT_IMAGE3D
                 || imageInfo->type == CL_MEM_OBJECT_IMAGE2D_ARRAY)
            slice_pitch_lod = row_pitch_lod * height_lod;
    }
    else
    {
        slice_pitch_lod = imageInfo->slicePitch;
        row_pitch_lod = imageInfo->rowPitch;
    }

    if (containsDenorms) *containsDenorms = 0;

    if (imageSampler->normalized_coords)
    {

        // We need to unnormalize our coordinates differently depending on
        // the image type, but 'x' is always processed the same way.

        x = unnormalize_coordinate("x", x, xAddressOffset, (float)width_lod,
                                   imageSampler->addressing_mode, verbose);

        switch (imageInfo->type)
        {

                // The image array types require special care:

            case CL_MEM_OBJECT_IMAGE1D_ARRAY:
                z = 0; // don't care -- unused for 1D arrays
                break;

            case CL_MEM_OBJECT_IMAGE2D_ARRAY:
                y = unnormalize_coordinate(
                    "y", y, yAddressOffset, (float)height_lod,
                    imageSampler->addressing_mode, verbose);
                break;

                // Everybody else:

            default:
                y = unnormalize_coordinate(
                    "y", y, yAddressOffset, (float)height_lod,
                    imageSampler->addressing_mode, verbose);
                z = unnormalize_coordinate(
                    "z", z, zAddressOffset, (float)depth_lod,
                    imageSampler->addressing_mode, verbose);
        }
    }
    else if (verbose)
    {

        switch (imageInfo->type)
        {
            case CL_MEM_OBJECT_IMAGE1D_ARRAY:
                log_info("Starting coordinate: %f, array index %f\n", x, y);
                break;
            case CL_MEM_OBJECT_IMAGE2D_ARRAY:
                log_info("Starting coordinate: %f, %f, array index %f\n", x, y,
                         z);
                break;
            case CL_MEM_OBJECT_IMAGE1D:
            case CL_MEM_OBJECT_IMAGE1D_BUFFER:
                log_info("Starting coordinate: %f\n", x);
                break;
            case CL_MEM_OBJECT_IMAGE2D:
                log_info("Starting coordinate: %f, %f\n", x, y);
                break;
            case CL_MEM_OBJECT_IMAGE3D:
            default: log_info("Starting coordinate: %f, %f, %f\n", x, y, z);
        }
    }

    // At this point, we have unnormalized coordinates.

    if (imageSampler->filter_mode == CL_FILTER_NEAREST)
    {
        int ix, iy, iz;

        // We apply the addressing function to the now-unnormalized
        // coordinates.  Note that the array cases again require special
        // care, per section 8.4 in the OpenCL 1.2 Specification.

        ix = adFn(static_cast<int>(floorf(x)), width_lod);

        switch (imageInfo->type)
        {
            case CL_MEM_OBJECT_IMAGE1D_ARRAY:
                iy = static_cast<int>(calculate_array_index(
                    y, (float)(imageInfo->arraySize - 1)));
                iz = 0;
                if (verbose)
                {
                    log_info("\tArray index %f evaluates to %d\n", y, iy);
                }
                break;
            case CL_MEM_OBJECT_IMAGE2D_ARRAY:
                iy = adFn(static_cast<int>(floorf(y)), height_lod);
                iz = static_cast<int>(calculate_array_index(
                    z, (float)(imageInfo->arraySize - 1)));
                if (verbose)
                {
                    log_info("\tArray index %f evaluates to %d\n", z, iz);
                }
                break;
            default:
                iy = adFn(static_cast<int>(floorf(y)), height_lod);
                if (depth_lod != 0)
                    iz = adFn(static_cast<int>(floorf(z)), depth_lod);
                else
                    iz = 0;
        }

        if (verbose)
        {
            if (iz)
                log_info(
                    "\tReference integer coords calculated: { %d, %d, %d }\n",
                    ix, iy, iz);
            else
                log_info("\tReference integer coords calculated: { %d, %d }\n",
                         ix, iy);
        }

        read_image_pixel_float(imageData, imageInfo, ix, iy, iz, outData, lod);
        check_for_denorms(outData, containsDenorms);
        for (int i = 0; i < 4; i++) returnVal.p[i] = fabsf(outData[i]);
        return returnVal;
    }
    else
    {
        // Linear filtering cases.

        size_t width = width_lod, height = height_lod, depth = depth_lod;

        // Image arrays can use 2D filtering, but require us to walk into the
        // image a certain number of slices before reading.

        if (depth == 0 || imageInfo->type == CL_MEM_OBJECT_IMAGE2D_ARRAY
            || imageInfo->type == CL_MEM_OBJECT_IMAGE1D_ARRAY)
        {
            float array_index = 0;

            size_t layer_offset = 0;

            if (imageInfo->type == CL_MEM_OBJECT_IMAGE2D_ARRAY)
            {
                array_index =
                    calculate_array_index(z, (float)(imageInfo->arraySize - 1));
                layer_offset = slice_pitch_lod * (size_t)array_index;
            }
            else if (imageInfo->type == CL_MEM_OBJECT_IMAGE1D_ARRAY)
            {
                array_index =
                    calculate_array_index(y, (float)(imageInfo->arraySize - 1));
                layer_offset = slice_pitch_lod * (size_t)array_index;

                // Set up y and height so that the filtering below is correct
                // 1D filtering on a single slice.
                height = 1;
            }

            int x1 = adFn(static_cast<int>(floorf(x - 0.5f)), width);
            int y1 = 0;
            int x2 = adFn(static_cast<int>(floorf(x - 0.5f) + 1), width);
            int y2 = 0;
            if ((imageInfo->type != CL_MEM_OBJECT_IMAGE1D)
                && (imageInfo->type != CL_MEM_OBJECT_IMAGE1D_ARRAY)
                && (imageInfo->type != CL_MEM_OBJECT_IMAGE1D_BUFFER))
            {
                y1 = adFn(static_cast<int>(floorf(y - 0.5f)), height);
                y2 = adFn(static_cast<int>(floorf(y - 0.5f) + 1), height);
            }
            else
            {
                y = 0.5f;
            }

            if (verbose)
            {
                log_info("\tActual integer coords used (i = floor(x-.5)): i0:{ "
                         "%d, %d } and i1:{ %d, %d }\n",
                         x1, y1, x2, y2);
                log_info("\tArray coordinate is %f\n", array_index);
            }

            // Walk to beginning of the 'correct' slice, if needed.
            char *imgPtr = ((char *)imageData) + layer_offset;

            float upLeft[4], upRight[4], lowLeft[4], lowRight[4];
            float maxUp[4], maxLow[4];
            read_image_pixel_float(imgPtr, imageInfo, x1, y1, 0, upLeft, lod);
            read_image_pixel_float(imgPtr, imageInfo, x2, y1, 0, upRight, lod);
            check_for_denorms(upLeft, containsDenorms);
            check_for_denorms(upRight, containsDenorms);
            pixelMax(upLeft, upRight, maxUp);
            read_image_pixel_float(imgPtr, imageInfo, x1, y2, 0, lowLeft, lod);
            read_image_pixel_float(imgPtr, imageInfo, x2, y2, 0, lowRight, lod);
            check_for_denorms(lowLeft, containsDenorms);
            check_for_denorms(lowRight, containsDenorms);
            pixelMax(lowLeft, lowRight, maxLow);
            pixelMax(maxUp, maxLow, returnVal.p);

            if (verbose)
            {
                if (NULL == containsDenorms)
                    log_info("\tSampled pixels (rgba order, denorms flushed to "
                             "zero):\n");
                else
                    log_info("\tSampled pixels (rgba order):\n");
                log_info("\t\tp00: %f, %f, %f, %f\n", upLeft[0], upLeft[1],
                         upLeft[2], upLeft[3]);
                log_info("\t\tp01: %f, %f, %f, %f\n", upRight[0], upRight[1],
                         upRight[2], upRight[3]);
                log_info("\t\tp10: %f, %f, %f, %f\n", lowLeft[0], lowLeft[1],
                         lowLeft[2], lowLeft[3]);
                log_info("\t\tp11: %f, %f, %f, %f\n", lowRight[0], lowRight[1],
                         lowRight[2], lowRight[3]);
            }

            double weights[2][2];

            weights[0][0] = weights[0][1] = 1.0 - frac(x - 0.5f);
            weights[1][0] = weights[1][1] = frac(x - 0.5f);
            weights[0][0] *= 1.0 - frac(y - 0.5f);
            weights[1][0] *= 1.0 - frac(y - 0.5f);
            weights[0][1] *= frac(y - 0.5f);
            weights[1][1] *= frac(y - 0.5f);

            if (verbose)
                log_info("\tfrac( x - 0.5f ) = %f,  frac( y - 0.5f ) = %f\n",
                         frac(x - 0.5f), frac(y - 0.5f));

            for (int i = 0; i < 3; i++)
            {
                outData[i] = (float)((upLeft[i] * weights[0][0])
                                     + (upRight[i] * weights[1][0])
                                     + (lowLeft[i] * weights[0][1])
                                     + (lowRight[i] * weights[1][1]));
                // flush subnormal results to zero if necessary
                if (NULL == containsDenorms && fabs(outData[i]) < FLT_MIN)
                    outData[i] = copysignf(0.0f, outData[i]);
            }
            outData[3] = (float)((upLeft[3] * weights[0][0])
                                 + (upRight[3] * weights[1][0])
                                 + (lowLeft[3] * weights[0][1])
                                 + (lowRight[3] * weights[1][1]));
            // flush subnormal results to zero if necessary
            if (NULL == containsDenorms && fabs(outData[3]) < FLT_MIN)
                outData[3] = copysignf(0.0f, outData[3]);
        }
        else
        {
            // 3D linear filtering
            int x1 = adFn(static_cast<int>(floorf(x - 0.5f)), width_lod);
            int y1 = adFn(static_cast<int>(floorf(y - 0.5f)), height_lod);
            int z1 = adFn(static_cast<int>(floorf(z - 0.5f)), depth_lod);
            int x2 = adFn(static_cast<int>(floorf(x - 0.5f) + 1), width_lod);
            int y2 = adFn(static_cast<int>(floorf(y - 0.5f) + 1), height_lod);
            int z2 = adFn(static_cast<int>(floorf(z - 0.5f) + 1), depth_lod);

            if (verbose)
                log_info("\tActual integer coords used (i = floor(x-.5)): "
                         "i0:{%d, %d, %d} and i1:{%d, %d, %d}\n",
                         x1, y1, z1, x2, y2, z2);

            float upLeftA[4], upRightA[4], lowLeftA[4], lowRightA[4];
            float upLeftB[4], upRightB[4], lowLeftB[4], lowRightB[4];
            float pixelMaxA[4], pixelMaxB[4];
            read_image_pixel_float(imageData, imageInfo, x1, y1, z1, upLeftA,
                                   lod);
            read_image_pixel_float(imageData, imageInfo, x2, y1, z1, upRightA,
                                   lod);
            check_for_denorms(upLeftA, containsDenorms);
            check_for_denorms(upRightA, containsDenorms);
            pixelMax(upLeftA, upRightA, pixelMaxA);
            read_image_pixel_float(imageData, imageInfo, x1, y2, z1, lowLeftA,
                                   lod);
            read_image_pixel_float(imageData, imageInfo, x2, y2, z1, lowRightA,
                                   lod);
            check_for_denorms(lowLeftA, containsDenorms);
            check_for_denorms(lowRightA, containsDenorms);
            pixelMax(lowLeftA, lowRightA, pixelMaxB);
            pixelMax(pixelMaxA, pixelMaxB, returnVal.p);
            read_image_pixel_float(imageData, imageInfo, x1, y1, z2, upLeftB,
                                   lod);
            read_image_pixel_float(imageData, imageInfo, x2, y1, z2, upRightB,
                                   lod);
            check_for_denorms(upLeftB, containsDenorms);
            check_for_denorms(upRightB, containsDenorms);
            pixelMax(upLeftB, upRightB, pixelMaxA);
            read_image_pixel_float(imageData, imageInfo, x1, y2, z2, lowLeftB,
                                   lod);
            read_image_pixel_float(imageData, imageInfo, x2, y2, z2, lowRightB,
                                   lod);
            check_for_denorms(lowLeftB, containsDenorms);
            check_for_denorms(lowRightB, containsDenorms);
            pixelMax(lowLeftB, lowRightB, pixelMaxB);
            pixelMax(pixelMaxA, pixelMaxB, pixelMaxA);
            pixelMax(pixelMaxA, returnVal.p, returnVal.p);

            if (verbose)
            {
                if (NULL == containsDenorms)
                    log_info("\tSampled pixels (rgba order, denorms flushed to "
                             "zero):\n");
                else
                    log_info("\tSampled pixels (rgba order):\n");
                log_info("\t\tp000: %f, %f, %f, %f\n", upLeftA[0], upLeftA[1],
                         upLeftA[2], upLeftA[3]);
                log_info("\t\tp001: %f, %f, %f, %f\n", upRightA[0], upRightA[1],
                         upRightA[2], upRightA[3]);
                log_info("\t\tp010: %f, %f, %f, %f\n", lowLeftA[0], lowLeftA[1],
                         lowLeftA[2], lowLeftA[3]);
                log_info("\t\tp011: %f, %f, %f, %f\n\n", lowRightA[0],
                         lowRightA[1], lowRightA[2], lowRightA[3]);
                log_info("\t\tp100: %f, %f, %f, %f\n", upLeftB[0], upLeftB[1],
                         upLeftB[2], upLeftB[3]);
                log_info("\t\tp101: %f, %f, %f, %f\n", upRightB[0], upRightB[1],
                         upRightB[2], upRightB[3]);
                log_info("\t\tp110: %f, %f, %f, %f\n", lowLeftB[0], lowLeftB[1],
                         lowLeftB[2], lowLeftB[3]);
                log_info("\t\tp111: %f, %f, %f, %f\n", lowRightB[0],
                         lowRightB[1], lowRightB[2], lowRightB[3]);
            }

            double weights[2][2][2];

            float a = frac(x - 0.5f), b = frac(y - 0.5f), c = frac(z - 0.5f);
            weights[0][0][0] = weights[0][1][0] = weights[0][0][1] =
                weights[0][1][1] = 1.f - a;
            weights[1][0][0] = weights[1][1][0] = weights[1][0][1] =
                weights[1][1][1] = a;
            weights[0][0][0] *= 1.f - b;
            weights[1][0][0] *= 1.f - b;
            weights[0][0][1] *= 1.f - b;
            weights[1][0][1] *= 1.f - b;
            weights[0][1][0] *= b;
            weights[1][1][0] *= b;
            weights[0][1][1] *= b;
            weights[1][1][1] *= b;
            weights[0][0][0] *= 1.f - c;
            weights[0][1][0] *= 1.f - c;
            weights[1][0][0] *= 1.f - c;
            weights[1][1][0] *= 1.f - c;
            weights[0][0][1] *= c;
            weights[0][1][1] *= c;
            weights[1][0][1] *= c;
            weights[1][1][1] *= c;

            if (verbose)
                log_info("\tfrac( x - 0.5f ) = %f,  frac( y - 0.5f ) = %f, "
                         "frac( z - 0.5f ) = %f\n",
                         frac(x - 0.5f), frac(y - 0.5f), frac(z - 0.5f));

            for (int i = 0; i < 3; i++)
            {
                outData[i] = (float)((upLeftA[i] * weights[0][0][0])
                                     + (upRightA[i] * weights[1][0][0])
                                     + (lowLeftA[i] * weights[0][1][0])
                                     + (lowRightA[i] * weights[1][1][0])
                                     + (upLeftB[i] * weights[0][0][1])
                                     + (upRightB[i] * weights[1][0][1])
                                     + (lowLeftB[i] * weights[0][1][1])
                                     + (lowRightB[i] * weights[1][1][1]));
                // flush subnormal results to zero if necessary
                if (NULL == containsDenorms && fabs(outData[i]) < FLT_MIN)
                    outData[i] = copysignf(0.0f, outData[i]);
            }
            outData[3] = (float)((upLeftA[3] * weights[0][0][0])
                                 + (upRightA[3] * weights[1][0][0])
                                 + (lowLeftA[3] * weights[0][1][0])
                                 + (lowRightA[3] * weights[1][1][0])
                                 + (upLeftB[3] * weights[0][0][1])
                                 + (upRightB[3] * weights[1][0][1])
                                 + (lowLeftB[3] * weights[0][1][1])
                                 + (lowRightB[3] * weights[1][1][1]));
            // flush subnormal results to zero if necessary
            if (NULL == containsDenorms && fabs(outData[3]) < FLT_MIN)
                outData[3] = copysignf(0.0f, outData[3]);
        }

        return returnVal;
    }
}

FloatPixel sample_image_pixel_float_offset(
    void *imageData, image_descriptor *imageInfo, float x, float y, float z,
    float xAddressOffset, float yAddressOffset, float zAddressOffset,
    image_sampler_data *imageSampler, float *outData, int verbose,
    int *containsDenorms)
{
    return sample_image_pixel_float_offset(
        imageData, imageInfo, x, y, z, xAddressOffset, yAddressOffset,
        zAddressOffset, imageSampler, outData, verbose, containsDenorms, 0);
}


int debug_find_vector_in_image(void *imagePtr, image_descriptor *imageInfo,
                               void *vectorToFind, size_t vectorSize, int *outX,
                               int *outY, int *outZ, size_t lod)
{
    int foundCount = 0;
    char *iPtr = (char *)imagePtr;
    size_t width;
    size_t depth;
    size_t height;
    size_t row_pitch;
    size_t slice_pitch;

    switch (imageInfo->type)
    {
        case CL_MEM_OBJECT_IMAGE1D:
            width = (imageInfo->width >> lod) ? (imageInfo->width >> lod) : 1;
            height = 1;
            depth = 1;
            break;
        case CL_MEM_OBJECT_IMAGE1D_ARRAY:
            width = (imageInfo->width >> lod) ? (imageInfo->width >> lod) : 1;
            height = 1;
            depth = imageInfo->arraySize;
            break;
        case CL_MEM_OBJECT_IMAGE2D:
            width = (imageInfo->width >> lod) ? (imageInfo->width >> lod) : 1;
            height =
                (imageInfo->height >> lod) ? (imageInfo->height >> lod) : 1;
            depth = 1;
            break;
        case CL_MEM_OBJECT_IMAGE2D_ARRAY:
            width = (imageInfo->width >> lod) ? (imageInfo->width >> lod) : 1;
            height =
                (imageInfo->height >> lod) ? (imageInfo->height >> lod) : 1;
            depth = imageInfo->arraySize;
            break;
        case CL_MEM_OBJECT_IMAGE3D:
            width = (imageInfo->width >> lod) ? (imageInfo->width >> lod) : 1;
            height =
                (imageInfo->height >> lod) ? (imageInfo->height >> lod) : 1;
            depth = (imageInfo->depth >> lod) ? (imageInfo->depth >> lod) : 1;
            break;
    }

    row_pitch = width * get_pixel_size(imageInfo->format);
    slice_pitch = row_pitch * height;

    for (size_t z = 0; z < depth; z++)
    {
        for (size_t y = 0; y < height; y++)
        {
            for (size_t x = 0; x < width; x++)
            {
                if (memcmp(iPtr, vectorToFind, vectorSize) == 0)
                {
                    if (foundCount == 0)
                    {
                        *outX = (int)x;
                        if (outY != NULL) *outY = (int)y;
                        if (outZ != NULL) *outZ = (int)z;
                    }
                    foundCount++;
                }
                iPtr += vectorSize;
            }
            iPtr += row_pitch - (width * vectorSize);
        }
        iPtr += slice_pitch - (height * row_pitch);
    }
    return foundCount;
}

int debug_find_pixel_in_image(void *imagePtr, image_descriptor *imageInfo,
                              unsigned int *valuesToFind, int *outX, int *outY,
                              int *outZ, int lod)
{
    char vectorToFind[4 * 4];
    size_t vectorSize = get_format_channel_count(imageInfo->format);


    if (imageInfo->format->image_channel_data_type == CL_UNSIGNED_INT8)
    {
        unsigned char *p = (unsigned char *)vectorToFind;
        for (unsigned int i = 0; i < vectorSize; i++)
            p[i] = (unsigned char)valuesToFind[i];
    }
    else if (imageInfo->format->image_channel_data_type == CL_UNSIGNED_INT16)
    {
        unsigned short *p = (unsigned short *)vectorToFind;
        for (unsigned int i = 0; i < vectorSize; i++)
            p[i] = (unsigned short)valuesToFind[i];
        vectorSize *= 2;
    }
    else if (imageInfo->format->image_channel_data_type == CL_UNSIGNED_INT32)
    {
        unsigned int *p = (unsigned int *)vectorToFind;
        for (unsigned int i = 0; i < vectorSize; i++)
            p[i] = (unsigned int)valuesToFind[i];
        vectorSize *= 4;
    }
    else
    {
        log_info("WARNING: Unable to search for debug pixel: invalid image "
                 "format\n");
        return false;
    }
    return debug_find_vector_in_image(imagePtr, imageInfo, vectorToFind,
                                      vectorSize, outX, outY, outZ, lod);
}

int debug_find_pixel_in_image(void *imagePtr, image_descriptor *imageInfo,
                              int *valuesToFind, int *outX, int *outY,
                              int *outZ, int lod)
{
    char vectorToFind[4 * 4];
    size_t vectorSize = get_format_channel_count(imageInfo->format);

    if (imageInfo->format->image_channel_data_type == CL_SIGNED_INT8)
    {
        char *p = (char *)vectorToFind;
        for (unsigned int i = 0; i < vectorSize; i++)
            p[i] = (char)valuesToFind[i];
    }
    else if (imageInfo->format->image_channel_data_type == CL_SIGNED_INT16)
    {
        short *p = (short *)vectorToFind;
        for (unsigned int i = 0; i < vectorSize; i++)
            p[i] = (short)valuesToFind[i];
        vectorSize *= 2;
    }
    else if (imageInfo->format->image_channel_data_type == CL_SIGNED_INT32)
    {
        int *p = (int *)vectorToFind;
        for (unsigned int i = 0; i < vectorSize; i++)
            p[i] = (int)valuesToFind[i];
        vectorSize *= 4;
    }
    else
    {
        log_info("WARNING: Unable to search for debug pixel: invalid image "
                 "format\n");
        return false;
    }
    return debug_find_vector_in_image(imagePtr, imageInfo, vectorToFind,
                                      vectorSize, outX, outY, outZ, lod);
}

int debug_find_pixel_in_image(void *imagePtr, image_descriptor *imageInfo,
                              float *valuesToFind, int *outX, int *outY,
                              int *outZ, int lod)
{
    char vectorToFind[4 * 4];
    float swizzled[4];
    memcpy(swizzled, valuesToFind, sizeof(swizzled));
    size_t vectorSize = get_pixel_size(imageInfo->format);
    pack_image_pixel(swizzled, imageInfo->format, vectorToFind);
    return debug_find_vector_in_image(imagePtr, imageInfo, vectorToFind,
                                      vectorSize, outX, outY, outZ, lod);
}

template <class T>
void swizzle_vector_for_image(T *srcVector, const cl_image_format *imageFormat)
{
    T temp;
    switch (imageFormat->image_channel_order)
    {
        case CL_A: srcVector[0] = srcVector[3]; break;
        case CL_R:
        case CL_Rx:
        case CL_RG:
        case CL_RGx:
        case CL_RGB:
        case CL_RGBx:
        case CL_RGBA:
        case CL_sRGB:
        case CL_sRGBx:
        case CL_sRGBA: break;
        case CL_RA: srcVector[1] = srcVector[3]; break;
        case CL_ARGB:
            temp = srcVector[3];
            srcVector[3] = srcVector[2];
            srcVector[2] = srcVector[1];
            srcVector[1] = srcVector[0];
            srcVector[0] = temp;
            break;
        case CL_ABGR:
            temp = srcVector[3];
            srcVector[3] = srcVector[0];
            srcVector[0] = temp;
            temp = srcVector[2];
            srcVector[2] = srcVector[1];
            srcVector[1] = temp;
            break;
        case CL_BGRA:
        case CL_sBGRA:
            temp = srcVector[0];
            srcVector[0] = srcVector[2];
            srcVector[2] = temp;
            break;
        case CL_INTENSITY:
            srcVector[3] = srcVector[0];
            srcVector[2] = srcVector[0];
            srcVector[1] = srcVector[0];
            break;
        case CL_LUMINANCE:
            srcVector[2] = srcVector[0];
            srcVector[1] = srcVector[0];
            break;
#ifdef CL_1RGB_APPLE
        case CL_1RGB_APPLE:
            temp = srcVector[3];
            srcVector[3] = srcVector[2];
            srcVector[2] = srcVector[1];
            srcVector[1] = srcVector[0];
            srcVector[0] = temp;
            break;
#endif
#ifdef CL_BGR1_APPLE
        case CL_BGR1_APPLE:
            temp = srcVector[0];
            srcVector[0] = srcVector[2];
            srcVector[2] = temp;
            break;
#endif
    }
}

#define SATURATE(v, min, max) (v < min ? min : (v > max ? max : v))

void pack_image_pixel(unsigned int *srcVector,
                      const cl_image_format *imageFormat, void *outData)
{
    swizzle_vector_for_image<unsigned int>(srcVector, imageFormat);
    size_t channelCount = get_format_channel_count(imageFormat);

    switch (imageFormat->image_channel_data_type)
    {
        case CL_UNSIGNED_INT8: {
            unsigned char *ptr = (unsigned char *)outData;
            for (unsigned int i = 0; i < channelCount; i++)
                ptr[i] = (unsigned char)SATURATE(srcVector[i], 0, 255);
            break;
        }
        case CL_UNSIGNED_INT16: {
            unsigned short *ptr = (unsigned short *)outData;
            for (unsigned int i = 0; i < channelCount; i++)
                ptr[i] = (unsigned short)SATURATE(srcVector[i], 0, 65535);
            break;
        }
        case CL_UNSIGNED_INT32: {
            unsigned int *ptr = (unsigned int *)outData;
            for (unsigned int i = 0; i < channelCount; i++)
                ptr[i] = (unsigned int)srcVector[i];
            break;
        }
        default: break;
    }
}

void pack_image_pixel(int *srcVector, const cl_image_format *imageFormat,
                      void *outData)
{
    swizzle_vector_for_image<int>(srcVector, imageFormat);
    size_t chanelCount = get_format_channel_count(imageFormat);

    switch (imageFormat->image_channel_data_type)
    {
        case CL_SIGNED_INT8: {
            char *ptr = (char *)outData;
            for (unsigned int i = 0; i < chanelCount; i++)
                ptr[i] = (char)SATURATE(srcVector[i], -128, 127);
            break;
        }
        case CL_SIGNED_INT16: {
            short *ptr = (short *)outData;
            for (unsigned int i = 0; i < chanelCount; i++)
                ptr[i] = (short)SATURATE(srcVector[i], -32768, 32767);
            break;
        }
        case CL_SIGNED_INT32: {
            int *ptr = (int *)outData;
            for (unsigned int i = 0; i < chanelCount; i++)
                ptr[i] = (int)srcVector[i];
            break;
        }
        default: break;
    }
}

cl_int round_to_even(float v)
{
    // clamp overflow
    if (v >= -(float)CL_INT_MIN) return CL_INT_MAX;
    if (v <= (float)CL_INT_MIN) return CL_INT_MIN;

    // round fractional values to integer value
    if (fabsf(v) < MAKE_HEX_FLOAT(0x1.0p23f, 0x1L, 23))
    {
        static const float magic[2] = { MAKE_HEX_FLOAT(0x1.0p23f, 0x1L, 23),
                                        MAKE_HEX_FLOAT(-0x1.0p23f, -0x1L, 23) };
        float magicVal = magic[v < 0.0f];
        v += magicVal;
        v -= magicVal;
    }

    return (cl_int)v;
}

void pack_image_pixel(float *srcVector, const cl_image_format *imageFormat,
                      void *outData)
{
    swizzle_vector_for_image<float>(srcVector, imageFormat);
    size_t channelCount = get_format_channel_count(imageFormat);
    switch (imageFormat->image_channel_data_type)
    {
        case CL_HALF_FLOAT: {
            cl_half *ptr = (cl_half *)outData;

            switch (gFloatToHalfRoundingMode)
            {
                case kRoundToNearestEven:
                    for (unsigned int i = 0; i < channelCount; i++)
                        ptr[i] = cl_half_from_float(srcVector[i], CL_HALF_RTE);
                    break;
                case kRoundTowardZero:
                    for (unsigned int i = 0; i < channelCount; i++)
                        ptr[i] = cl_half_from_float(srcVector[i], CL_HALF_RTZ);
                    break;
                default:
                    log_error("ERROR: Test internal error -- unhandled or "
                              "unknown float->half rounding mode.\n");
                    exit(-1);
                    break;
            }
            break;
        }

        case CL_FLOAT: {
            cl_float *ptr = (cl_float *)outData;
            for (unsigned int i = 0; i < channelCount; i++)
                ptr[i] = srcVector[i];
            break;
        }

        case CL_SNORM_INT8: {
            cl_char *ptr = (cl_char *)outData;
            for (unsigned int i = 0; i < channelCount; i++)
                ptr[i] =
                    (cl_char)NORMALIZE_SIGNED(srcVector[i], -127.0f, 127.f);
            break;
        }
        case CL_SNORM_INT16: {
            cl_short *ptr = (cl_short *)outData;
            for (unsigned int i = 0; i < channelCount; i++)
                ptr[i] =
                    (short)NORMALIZE_SIGNED(srcVector[i], -32767.f, 32767.f);
            break;
        }
        case CL_UNORM_INT8: {
            cl_uchar *ptr = (cl_uchar *)outData;
            if (is_sRGBA_order(imageFormat->image_channel_order))
            {
                ptr[0] = (unsigned char)(sRGBmap(srcVector[0]) + 0.5);
                ptr[1] = (unsigned char)(sRGBmap(srcVector[1]) + 0.5);
                ptr[2] = (unsigned char)(sRGBmap(srcVector[2]) + 0.5);
                if (channelCount == 4)
                    ptr[3] = (unsigned char)NORMALIZE(srcVector[3], 255.f);
            }
            else
            {
                for (unsigned int i = 0; i < channelCount; i++)
                    ptr[i] = (unsigned char)NORMALIZE(srcVector[i], 255.f);
            }
#ifdef CL_1RGB_APPLE
            if (imageFormat->image_channel_order == CL_1RGB_APPLE)
                ptr[0] = 255.0f;
#endif
#ifdef CL_BGR1_APPLE
            if (imageFormat->image_channel_order == CL_BGR1_APPLE)
                ptr[3] = 255.0f;
#endif
            break;
        }
        case CL_UNORM_INT16: {
            cl_ushort *ptr = (cl_ushort *)outData;
            for (unsigned int i = 0; i < channelCount; i++)
                ptr[i] = (unsigned short)NORMALIZE(srcVector[i], 65535.f);
            break;
        }
        case CL_UNORM_SHORT_555: {
            cl_ushort *ptr = (cl_ushort *)outData;
            ptr[0] =
                (((unsigned short)NORMALIZE(srcVector[0], 31.f) & 31) << 10)
                | (((unsigned short)NORMALIZE(srcVector[1], 31.f) & 31) << 5)
                | (((unsigned short)NORMALIZE(srcVector[2], 31.f) & 31) << 0);
            break;
        }
        case CL_UNORM_SHORT_565: {
            cl_ushort *ptr = (cl_ushort *)outData;
            ptr[0] =
                (((unsigned short)NORMALIZE(srcVector[0], 31.f) & 31) << 11)
                | (((unsigned short)NORMALIZE(srcVector[1], 63.f) & 63) << 5)
                | (((unsigned short)NORMALIZE(srcVector[2], 31.f) & 31) << 0);
            break;
        }
        case CL_UNORM_INT_101010: {
            cl_uint *ptr = (cl_uint *)outData;
            ptr[0] =
                (((unsigned int)NORMALIZE(srcVector[0], 1023.f) & 1023) << 20)
                | (((unsigned int)NORMALIZE(srcVector[1], 1023.f) & 1023) << 10)
                | (((unsigned int)NORMALIZE(srcVector[2], 1023.f) & 1023) << 0);
            break;
        }
        case CL_SIGNED_INT8: {
            cl_char *ptr = (cl_char *)outData;
            for (unsigned int i = 0; i < channelCount; i++)
                ptr[i] =
                    (cl_char)CONVERT_INT(srcVector[i], -127.0f, 127.f, 127);
            break;
        }
        case CL_SIGNED_INT16: {
            cl_short *ptr = (cl_short *)outData;
            for (unsigned int i = 0; i < channelCount; i++)
                ptr[i] =
                    (short)CONVERT_INT(srcVector[i], -32767.f, 32767.f, 32767);
            break;
        }
        case CL_SIGNED_INT32: {
            cl_int *ptr = (cl_int *)outData;
            for (unsigned int i = 0; i < channelCount; i++)
                ptr[i] = round_to_even(srcVector[i]);
            break;
        }
        case CL_UNSIGNED_INT8: {
            cl_uchar *ptr = (cl_uchar *)outData;
            for (unsigned int i = 0; i < channelCount; i++)
                ptr[i] =
                    (cl_uchar)CONVERT_UINT(srcVector[i], 255.f, CL_UCHAR_MAX);
            break;
        }
        case CL_UNSIGNED_INT16: {
            cl_ushort *ptr = (cl_ushort *)outData;
            for (unsigned int i = 0; i < channelCount; i++)
                ptr[i] = (cl_ushort)CONVERT_UINT(srcVector[i], 32767.f,
                                                 CL_USHRT_MAX);
            break;
        }
        case CL_UNSIGNED_INT32: {
            cl_uint *ptr = (cl_uint *)outData;
            for (unsigned int i = 0; i < channelCount; i++)
                ptr[i] = (cl_uint)CONVERT_UINT(
                    srcVector[i],
                    MAKE_HEX_FLOAT(0x1.fffffep31f, 0x1fffffe, 31 - 23),
                    CL_UINT_MAX);
            break;
        }
#ifdef CL_SFIXED14_APPLE
        case CL_SFIXED14_APPLE: {
            cl_ushort *ptr = (cl_ushort *)outData;
            for (unsigned int i = 0; i < channelCount; i++)
            {
                cl_float f = fmaxf(srcVector[i], -1.0f);
                f = fminf(f, 3.0f);
                cl_int d = rintf(f * 0x1.0p14f);
                d += 16384;
                if (d > CL_USHRT_MAX) d = CL_USHRT_MAX;
                ptr[i] = d;
            }
            break;
        }
#endif
        default:
            log_error("INTERNAL ERROR: unknown format (%d)\n",
                      imageFormat->image_channel_data_type);
            exit(-1);
            break;
    }
}

void pack_image_pixel_error(const float *srcVector,
                            const cl_image_format *imageFormat,
                            const void *results, float *errors)
{
    size_t channelCount = get_format_channel_count(imageFormat);
    switch (imageFormat->image_channel_data_type)
    {
        case CL_HALF_FLOAT: {
            const cl_half *ptr = (const cl_half *)results;

            for (unsigned int i = 0; i < channelCount; i++)
                errors[i] = Ulp_Error_Half(ptr[i], srcVector[i]);

            break;
        }

        case CL_FLOAT: {
            const cl_ushort *ptr = (const cl_ushort *)results;

            for (unsigned int i = 0; i < channelCount; i++)
                errors[i] = Ulp_Error(ptr[i], srcVector[i]);

            break;
        }

        case CL_SNORM_INT8: {
            const cl_char *ptr = (const cl_char *)results;

            for (unsigned int i = 0; i < channelCount; i++)
                errors[i] = ptr[i]
                    - NORMALIZE_SIGNED_UNROUNDED(srcVector[i], -127.0f, 127.f);

            break;
        }
        case CL_SNORM_INT16: {
            const cl_short *ptr = (const cl_short *)results;

            for (unsigned int i = 0; i < channelCount; i++)
                errors[i] = ptr[i]
                    - NORMALIZE_SIGNED_UNROUNDED(srcVector[i], -32767.f,
                                                 32767.f);

            break;
        }
        case CL_UNORM_INT8: {
            const cl_uchar *ptr = (const cl_uchar *)results;

            for (unsigned int i = 0; i < channelCount; i++)
                errors[i] = ptr[i] - NORMALIZE_UNROUNDED(srcVector[i], 255.f);

            break;
        }
        case CL_UNORM_INT16: {
            const cl_ushort *ptr = (const cl_ushort *)results;

            for (unsigned int i = 0; i < channelCount; i++)
                errors[i] = ptr[i] - NORMALIZE_UNROUNDED(srcVector[i], 65535.f);

            break;
        }
        case CL_UNORM_SHORT_555: {
            const cl_ushort *ptr = (const cl_ushort *)results;

            errors[0] =
                ((ptr[0] >> 10) & 31) - NORMALIZE_UNROUNDED(srcVector[0], 31.f);
            errors[1] =
                ((ptr[0] >> 5) & 31) - NORMALIZE_UNROUNDED(srcVector[1], 31.f);
            errors[2] =
                ((ptr[0] >> 0) & 31) - NORMALIZE_UNROUNDED(srcVector[2], 31.f);

            break;
        }
        case CL_UNORM_SHORT_565: {
            const cl_ushort *ptr = (const cl_ushort *)results;

            errors[0] =
                ((ptr[0] >> 11) & 31) - NORMALIZE_UNROUNDED(srcVector[0], 31.f);
            errors[1] =
                ((ptr[0] >> 5) & 63) - NORMALIZE_UNROUNDED(srcVector[1], 63.f);
            errors[2] =
                ((ptr[0] >> 0) & 31) - NORMALIZE_UNROUNDED(srcVector[2], 31.f);

            break;
        }
        case CL_UNORM_INT_101010: {
            const cl_uint *ptr = (const cl_uint *)results;

            errors[0] = ((ptr[0] >> 20) & 1023)
                - NORMALIZE_UNROUNDED(srcVector[0], 1023.f);
            errors[1] = ((ptr[0] >> 10) & 1023)
                - NORMALIZE_UNROUNDED(srcVector[1], 1023.f);
            errors[2] = ((ptr[0] >> 0) & 1023)
                - NORMALIZE_UNROUNDED(srcVector[2], 1023.f);

            break;
        }
        case CL_SIGNED_INT8: {
            const cl_char *ptr = (const cl_char *)results;

            for (unsigned int i = 0; i < channelCount; i++)
                errors[i] =
                    ptr[i] - CONVERT_INT(srcVector[i], -127.0f, 127.f, 127);

            break;
        }
        case CL_SIGNED_INT16: {
            const cl_short *ptr = (const cl_short *)results;
            for (unsigned int i = 0; i < channelCount; i++)
                errors[i] = ptr[i]
                    - CONVERT_INT(srcVector[i], -32767.f, 32767.f, 32767);
            break;
        }
        case CL_SIGNED_INT32: {
            const cl_int *ptr = (const cl_int *)results;
            for (unsigned int i = 0; i < channelCount; i++)
                errors[i] = (cl_float)((cl_long)ptr[i]
                                       - (cl_long)round_to_even(srcVector[i]));
            break;
        }
        case CL_UNSIGNED_INT8: {
            const cl_uchar *ptr = (const cl_uchar *)results;
            for (unsigned int i = 0; i < channelCount; i++)
                errors[i] = static_cast<float>(
                    (cl_int)ptr[i]
                    - (cl_int)CONVERT_UINT(srcVector[i], 255.f, CL_UCHAR_MAX));
            break;
        }
        case CL_UNSIGNED_INT16: {
            const cl_ushort *ptr = (const cl_ushort *)results;
            for (unsigned int i = 0; i < channelCount; i++)
                errors[i] = static_cast<float>(
                    (cl_int)ptr[i]
                    - (cl_int)CONVERT_UINT(srcVector[i], 32767.f,
                                           CL_USHRT_MAX));
            break;
        }
        case CL_UNSIGNED_INT32: {
            const cl_uint *ptr = (const cl_uint *)results;
            for (unsigned int i = 0; i < channelCount; i++)
                errors[i] = (cl_float)(
                    (cl_long)ptr[i]
                    - (cl_long)CONVERT_UINT(
                        srcVector[i],
                        MAKE_HEX_FLOAT(0x1.fffffep31f, 0x1fffffe, 31 - 23),
                        CL_UINT_MAX));
            break;
        }
#ifdef CL_SFIXED14_APPLE
        case CL_SFIXED14_APPLE: {
            const cl_ushort *ptr = (const cl_ushort *)results;

            for (unsigned int i = 0; i < channelCount; i++)
                errors[i] = ptr[i]
                    - NORMALIZE_SIGNED_UNROUNDED(((int)srcVector[i] - 16384),
                                                 -16384.f, 49151.f);

            break;
        }
#endif
        default:
            log_error("INTERNAL ERROR: unknown format (%d)\n",
                      imageFormat->image_channel_data_type);
            exit(-1);
            break;
    }
}


//
//  Autodetect which rounding mode is used for image writes to CL_HALF_FLOAT
//  This should be called lazily before attempting to verify image writes,
//  otherwise an error will occur.
//
int DetectFloatToHalfRoundingMode(
    cl_command_queue q) // Returns CL_SUCCESS on success
{
    cl_int err = CL_SUCCESS;

    if (gFloatToHalfRoundingMode == kDefaultRoundingMode)
    {
        // Some numbers near 0.5f, that we look at to see how the values are
        // rounded.
        static const cl_uint inData[4 * 4] = {
            0x3f000fffU, 0x3f001000U, 0x3f001001U, 0U,
            0x3f001fffU, 0x3f002000U, 0x3f002001U, 0U,
            0x3f002fffU, 0x3f003000U, 0x3f003001U, 0U,
            0x3f003fffU, 0x3f004000U, 0x3f004001U, 0U
        };
        static const size_t count = sizeof(inData) / (4 * sizeof(inData[0]));
        const float *inp = (const float *)inData;
        cl_context context = NULL;

        // Create an input buffer
        err = clGetCommandQueueInfo(q, CL_QUEUE_CONTEXT, sizeof(context),
                                    &context, NULL);
        if (err)
        {
            log_error("Error:  could not get context from command queue in "
                      "DetectFloatToHalfRoundingMode  (%d)",
                      err);
            return err;
        }

        cl_mem inBuf = clCreateBuffer(context,
                                      CL_MEM_READ_ONLY | CL_MEM_COPY_HOST_PTR
                                          | CL_MEM_ALLOC_HOST_PTR,
                                      sizeof(inData), (void *)inData, &err);
        if (NULL == inBuf || err)
        {
            log_error("Error:  could not create input buffer in "
                      "DetectFloatToHalfRoundingMode  (err: %d)",
                      err);
            return err;
        }

        // Create a small output image
        cl_image_format fmt = { CL_RGBA, CL_HALF_FLOAT };
        cl_mem outImage = create_image_2d(context, CL_MEM_WRITE_ONLY, &fmt,
                                          count, 1, 0, NULL, &err);
        if (NULL == outImage || err)
        {
            log_error("Error:  could not create half float out image in "
                      "DetectFloatToHalfRoundingMode  (err: %d)",
                      err);
            clReleaseMemObject(inBuf);
            return err;
        }

        // Create our program, and a kernel
        const char *kernelSource[1] = {
            "kernel void detect_round( global float4 *in, write_only image2d_t "
            "out )\n"
            "{\n"
            "   write_imagef( out, (int2)(get_global_id(0),0), "
            "in[get_global_id(0)] );\n"
            "}\n"
        };

        clProgramWrapper program;
        clKernelWrapper kernel;
        err = create_single_kernel_helper(context, &program, &kernel, 1,
                                          kernelSource, "detect_round");

        if (NULL == program || err)
        {
            log_error("Error:  could not create program in "
                      "DetectFloatToHalfRoundingMode (err: %d)",
                      err);
            clReleaseMemObject(inBuf);
            clReleaseMemObject(outImage);
            return err;
        }

        cl_device_id device = NULL;
        err = clGetCommandQueueInfo(q, CL_QUEUE_DEVICE, sizeof(device), &device,
                                    NULL);
        if (err)
        {
            log_error("Error:  could not get device from command queue in "
                      "DetectFloatToHalfRoundingMode  (%d)",
                      err);
            clReleaseMemObject(inBuf);
            clReleaseMemObject(outImage);
            return err;
        }

        err = clSetKernelArg(kernel, 0, sizeof(cl_mem), &inBuf);
        if (err)
        {
            log_error("Error: could not set argument 0 of kernel in "
                      "DetectFloatToHalfRoundingMode (%d)",
                      err);
            clReleaseMemObject(inBuf);
            clReleaseMemObject(outImage);
            return err;
        }

        err = clSetKernelArg(kernel, 1, sizeof(cl_mem), &outImage);
        if (err)
        {
            log_error("Error: could not set argument 1 of kernel in "
                      "DetectFloatToHalfRoundingMode (%d)",
                      err);
            clReleaseMemObject(inBuf);
            clReleaseMemObject(outImage);
            return err;
        }

        // Run the kernel
        size_t global_work_size = count;
        err = clEnqueueNDRangeKernel(q, kernel, 1, NULL, &global_work_size,
                                     NULL, 0, NULL, NULL);
        if (err)
        {
            log_error("Error: could not enqueue kernel in "
                      "DetectFloatToHalfRoundingMode (%d)",
                      err);
            clReleaseMemObject(inBuf);
            clReleaseMemObject(outImage);
            return err;
        }

        // read the results
        cl_half outBuf[count * 4];
        memset(outBuf, -1, sizeof(outBuf));
        size_t origin[3] = { 0, 0, 0 };
        size_t region[3] = { count, 1, 1 };
        err = clEnqueueReadImage(q, outImage, CL_TRUE, origin, region, 0, 0,
                                 outBuf, 0, NULL, NULL);
        if (err)
        {
            log_error("Error: could not read output image in "
                      "DetectFloatToHalfRoundingMode (%d)",
                      err);
            clReleaseMemObject(inBuf);
            clReleaseMemObject(outImage);
            return err;
        }

        // Generate our list of reference results
        cl_half rte_ref[count * 4];
        cl_half rtz_ref[count * 4];
        for (size_t i = 0; i < 4 * count; i++)
        {
            rte_ref[i] = cl_half_from_float(inp[i], CL_HALF_RTE);
            rtz_ref[i] = cl_half_from_float(inp[i], CL_HALF_RTZ);
        }

        // Verify that we got something in either rtz or rte mode
        if (0 == memcmp(rte_ref, outBuf, sizeof(rte_ref)))
        {
            log_info("Autodetected float->half rounding mode to be rte\n");
            gFloatToHalfRoundingMode = kRoundToNearestEven;
        }
        else if (0 == memcmp(rtz_ref, outBuf, sizeof(rtz_ref)))
        {
            log_info("Autodetected float->half rounding mode to be rtz\n");
            gFloatToHalfRoundingMode = kRoundTowardZero;
        }
        else
        {
            log_error("ERROR: float to half conversions proceed with invalid "
                      "rounding mode!\n");
            log_info("\nfor:");
            for (size_t i = 0; i < count; i++)
                log_info(" {%a, %a, %a, %a},", inp[4 * i], inp[4 * i + 1],
                         inp[4 * i + 2], inp[4 * i + 3]);
            log_info("\ngot:");
            for (size_t i = 0; i < count; i++)
                log_info(" {0x%4.4x, 0x%4.4x, 0x%4.4x, 0x%4.4x},",
                         outBuf[4 * i], outBuf[4 * i + 1], outBuf[4 * i + 2],
                         outBuf[4 * i + 3]);
            log_info("\nrte:");
            for (size_t i = 0; i < count; i++)
                log_info(" {0x%4.4x, 0x%4.4x, 0x%4.4x, 0x%4.4x},",
                         rte_ref[4 * i], rte_ref[4 * i + 1], rte_ref[4 * i + 2],
                         rte_ref[4 * i + 3]);
            log_info("\nrtz:");
            for (size_t i = 0; i < count; i++)
                log_info(" {0x%4.4x, 0x%4.4x, 0x%4.4x, 0x%4.4x},",
                         rtz_ref[4 * i], rtz_ref[4 * i + 1], rtz_ref[4 * i + 2],
                         rtz_ref[4 * i + 3]);
            log_info("\n");
            err = -1;
            gFloatToHalfRoundingMode = kRoundingModeCount; // illegal value
        }

        // clean up
        clReleaseMemObject(inBuf);
        clReleaseMemObject(outImage);
        return err;
    }

    // Make sure that the rounding mode was successfully detected, if we checked
    // earlier
    if (gFloatToHalfRoundingMode != kRoundToNearestEven
        && gFloatToHalfRoundingMode != kRoundTowardZero)
        return -2;

    return err;
}

char *create_random_image_data(ExplicitType dataType,
                               image_descriptor *imageInfo,
                               BufferOwningPtr<char> &P, MTdata d,
                               bool image2DFromBuffer)
{
    size_t allocSize, numPixels;
    if (/*gTestMipmaps*/ imageInfo->num_mip_levels > 1)
    {
        allocSize = (size_t)(compute_mipmapped_image_size(*imageInfo) * 4
                             * get_explicit_type_size(dataType))
            / get_pixel_size(imageInfo->format);
        numPixels = allocSize / (get_explicit_type_size(dataType) * 4);
    }
    else
    {
        numPixels = (image2DFromBuffer ? imageInfo->rowPitch : imageInfo->width)
            * imageInfo->height * (imageInfo->depth ? imageInfo->depth : 1)
            * (imageInfo->arraySize ? imageInfo->arraySize : 1);
        allocSize = numPixels * 4 * get_explicit_type_size(dataType);
    }

#if 0 // DEBUG
    {
      fprintf(stderr,"--- create_random_image_data:\n");
      fprintf(stderr,"allocSize = %zu\n",allocSize);
      fprintf(stderr,"numPixels = %zu\n",numPixels);
      fprintf(stderr,"width = %zu\n",imageInfo->width);
      fprintf(stderr,"height = %zu\n",imageInfo->height);
      fprintf(stderr,"depth = %zu\n",imageInfo->depth);
      fprintf(stderr,"rowPitch = %zu\n",imageInfo->rowPitch);
      fprintf(stderr,"slicePitch = %zu\n",imageInfo->slicePitch);
      fprintf(stderr,"arraySize = %zu\n",imageInfo->arraySize);
      fprintf(stderr,"explicit_type_size = %zu\n",get_explicit_type_size(dataType));
    }
#endif

#if defined(__APPLE__)
    char *data = NULL;
    if (gDeviceType == CL_DEVICE_TYPE_CPU)
    {
        size_t mapSize =
            ((allocSize + 4095L) & -4096L) + 8192; // alloc two extra pages.

        void *map = mmap(0, mapSize, PROT_READ | PROT_WRITE,
                         MAP_ANON | MAP_PRIVATE, 0, 0);
        if (map == MAP_FAILED)
        {
            perror("create_random_image_data: mmap");
            log_error("%s:%d: mmap failed, mapSize = %zu\n", __FILE__, __LINE__,
                      mapSize);
        }
        intptr_t data_end = (intptr_t)map + mapSize - 4096;
        data = (char *)(data_end - (intptr_t)allocSize);

        mprotect(map, 4096, PROT_NONE);
        mprotect((void *)((char *)map + mapSize - 4096), 4096, PROT_NONE);
        P.reset(data, map, mapSize);
    }
    else
    {
        data = (char *)malloc(allocSize);
        P.reset(data);
    }
#else
    char *data =
        (char *)align_malloc(allocSize, get_pixel_alignment(imageInfo->format));
    P.reset(data, NULL, 0, allocSize, true);
#endif

    if (data == NULL)
    {
        log_error(
            "ERROR: Unable to malloc %zu bytes for create_random_image_data\n",
            allocSize);
        return NULL;
    }

    switch (dataType)
    {
        case kFloat: {
            float *inputValues = (float *)data;
            switch (imageInfo->format->image_channel_data_type)
            {
                case CL_HALF_FLOAT: {
                    // Generate data that is (mostly) inside the range of a half
                    // float const float HALF_MIN = 5.96046448e-08f;
                    const float HALF_MAX = 65504.0f;

                    size_t i = 0;
                    inputValues[i++] = 0.f;
                    inputValues[i++] = 1.f;
                    inputValues[i++] = -1.f;
                    inputValues[i++] = 2.f;
                    for (; i < numPixels * 4; i++)
                        inputValues[i] = get_random_float(-HALF_MAX - 2.f,
                                                          HALF_MAX + 2.f, d);
                }
                break;
#ifdef CL_SFIXED14_APPLE
                case CL_SFIXED14_APPLE: {
                    size_t i = 0;
                    if (numPixels * 4 >= 8)
                    {
                        inputValues[i++] = INFINITY;
                        inputValues[i++] = 0x1.0p14f;
                        inputValues[i++] = 0x1.0p31f;
                        inputValues[i++] = 0x1.0p32f;
                        inputValues[i++] = -INFINITY;
                        inputValues[i++] = -0x1.0p14f;
                        inputValues[i++] = -0x1.0p31f;
                        inputValues[i++] = -0x1.1p31f;
                    }
                    for (; i < numPixels * 4; i++)
                        inputValues[i] = get_random_float(-1.1f, 3.1f, d);
                }
                break;
#endif
                case CL_FLOAT: {
                    size_t i = 0;
                    inputValues[i++] = INFINITY;
                    inputValues[i++] = -INFINITY;
                    inputValues[i++] = 0.0f;
                    inputValues[i++] = 0.0f;
                    cl_uint *p = (cl_uint *)data;
                    for (; i < numPixels * 4; i++) p[i] = genrand_int32(d);
                }
                break;

                default:
                    size_t i = 0;
                    if (numPixels * 4 >= 36)
                    {
                        inputValues[i++] = 0.0f;
                        inputValues[i++] = 0.5f;
                        inputValues[i++] = 31.5f;
                        inputValues[i++] = 32.0f;
                        inputValues[i++] = 127.5f;
                        inputValues[i++] = 128.0f;
                        inputValues[i++] = 255.5f;
                        inputValues[i++] = 256.0f;
                        inputValues[i++] = 1023.5f;
                        inputValues[i++] = 1024.0f;
                        inputValues[i++] = 32767.5f;
                        inputValues[i++] = 32768.0f;
                        inputValues[i++] = 65535.5f;
                        inputValues[i++] = 65536.0f;
                        inputValues[i++] = 2147483648.0f;
                        inputValues[i++] = 4294967296.0f;
                        inputValues[i++] = MAKE_HEX_FLOAT(0x1.0p63f, 1, 63);
                        inputValues[i++] = MAKE_HEX_FLOAT(0x1.0p64f, 1, 64);
                        inputValues[i++] = -0.0f;
                        inputValues[i++] = -0.5f;
                        inputValues[i++] = -31.5f;
                        inputValues[i++] = -32.0f;
                        inputValues[i++] = -127.5f;
                        inputValues[i++] = -128.0f;
                        inputValues[i++] = -255.5f;
                        inputValues[i++] = -256.0f;
                        inputValues[i++] = -1023.5f;
                        inputValues[i++] = -1024.0f;
                        inputValues[i++] = -32767.5f;
                        inputValues[i++] = -32768.0f;
                        inputValues[i++] = -65535.5f;
                        inputValues[i++] = -65536.0f;
                        inputValues[i++] = -2147483648.0f;
                        inputValues[i++] = -4294967296.0f;
                        inputValues[i++] = -MAKE_HEX_FLOAT(0x1.0p63f, 1, 63);
                        inputValues[i++] = -MAKE_HEX_FLOAT(0x1.0p64f, 1, 64);
                    }
                    if (is_format_signed(imageInfo->format))
                    {
                        for (; i < numPixels * 4; i++)
                            inputValues[i] = get_random_float(-1.1f, 1.1f, d);
                    }
                    else
                    {
                        for (; i < numPixels * 4; i++)
                            inputValues[i] = get_random_float(-0.1f, 1.1f, d);
                    }
                    break;
            }
            break;
        }

        case kInt: {
            int *imageData = (int *)data;

            // We want to generate ints (mostly) in range of the target format
            int formatMin = get_format_min_int(imageInfo->format);
            size_t formatMax = get_format_max_int(imageInfo->format);
            if (formatMin == 0)
            {
                // Unsigned values, but we are only an int, so cap the actual
                // max at the max of signed ints
                if (formatMax > 2147483647L) formatMax = 2147483647L;
            }
            // If the final format is small enough, give us a bit of room for
            // out-of-range values to test
            if (formatMax < 2147483647L) formatMax += 2;
            if (formatMin > -2147483648LL) formatMin -= 2;

            // Now gen
            for (size_t i = 0; i < numPixels * 4; i++)
            {
                imageData[i] = random_in_range(formatMin, (int)formatMax, d);
            }
            break;
        }

        case kUInt:
        case kUnsignedInt: {
            unsigned int *imageData = (unsigned int *)data;

            // We want to generate ints (mostly) in range of the target format
            int formatMin = get_format_min_int(imageInfo->format);
            size_t formatMax = get_format_max_int(imageInfo->format);
            if (formatMin < 0) formatMin = 0;
            // If the final format is small enough, give us a bit of room for
            // out-of-range values to test
            if (formatMax < 4294967295LL) formatMax += 2;

            // Now gen
            for (size_t i = 0; i < numPixels * 4; i++)
            {
                imageData[i] = random_in_range(formatMin, (int)formatMax, d);
            }
            break;
        }
        default:
            // Unsupported source format
            delete[] data;
            return NULL;
    }

    return data;
}

/*
    deprecated
bool clamp_image_coord( image_sampler_data *imageSampler, float value, size_t
max, int &outValue )
{
    int v = (int)value;

    switch(imageSampler->addressing_mode)
    {
        case CL_ADDRESS_REPEAT:
            outValue = v;
            while( v < 0 )
                v += (int)max;
            while( v >= (int)max )
                v -= (int)max;
            if( v != outValue )
            {
                outValue = v;
                return true;
            }
            return false;

        case CL_ADDRESS_MIRRORED_REPEAT:
            log_info( "ERROR: unimplemented for CL_ADDRESS_MIRRORED_REPEAT. Do
we ever use this? exit(-1);

        default:
            if( v < 0 )
            {
                outValue = 0;
                return true;
            }
            if( v >= (int)max )
            {
                outValue = (int)max - 1;
                return true;
            }
            outValue = v;
            return false;
    }

}
*/

void get_sampler_kernel_code(image_sampler_data *imageSampler, char *outLine)
{
    const char *normalized;
    const char *addressMode;
    const char *filterMode;

    if (imageSampler->addressing_mode == CL_ADDRESS_CLAMP)
        addressMode = "CLK_ADDRESS_CLAMP";
    else if (imageSampler->addressing_mode == CL_ADDRESS_CLAMP_TO_EDGE)
        addressMode = "CLK_ADDRESS_CLAMP_TO_EDGE";
    else if (imageSampler->addressing_mode == CL_ADDRESS_REPEAT)
        addressMode = "CLK_ADDRESS_REPEAT";
    else if (imageSampler->addressing_mode == CL_ADDRESS_MIRRORED_REPEAT)
        addressMode = "CLK_ADDRESS_MIRRORED_REPEAT";
    else if (imageSampler->addressing_mode == CL_ADDRESS_NONE)
        addressMode = "CLK_ADDRESS_NONE";
    else
    {
        log_error("**Error: Unknown addressing mode! Aborting...\n");
        abort();
    }

    if (imageSampler->normalized_coords)
        normalized = "CLK_NORMALIZED_COORDS_TRUE";
    else
        normalized = "CLK_NORMALIZED_COORDS_FALSE";

    if (imageSampler->filter_mode == CL_FILTER_LINEAR)
        filterMode = "CLK_FILTER_LINEAR";
    else
        filterMode = "CLK_FILTER_NEAREST";

    sprintf(outLine, "    const sampler_t imageSampler = %s | %s | %s;\n",
            addressMode, filterMode, normalized);
}

void copy_image_data(image_descriptor *srcImageInfo,
                     image_descriptor *dstImageInfo, void *imageValues,
                     void *destImageValues, const size_t sourcePos[],
                     const size_t destPos[], const size_t regionSize[])
{
    //  assert( srcImageInfo->format == dstImageInfo->format );

    size_t src_mip_level_offset = 0, dst_mip_level_offset = 0;
    size_t sourcePos_lod[3], destPos_lod[3], src_lod, dst_lod;
    size_t src_row_pitch_lod, src_slice_pitch_lod;
    size_t dst_row_pitch_lod, dst_slice_pitch_lod;

    size_t pixelSize = get_pixel_size(srcImageInfo->format);

    sourcePos_lod[0] = sourcePos[0];
    sourcePos_lod[1] = sourcePos[1];
    sourcePos_lod[2] = sourcePos[2];
    destPos_lod[0] = destPos[0];
    destPos_lod[1] = destPos[1];
    destPos_lod[2] = destPos[2];
    src_row_pitch_lod = srcImageInfo->rowPitch;
    dst_row_pitch_lod = dstImageInfo->rowPitch;
    src_slice_pitch_lod = srcImageInfo->slicePitch;
    dst_slice_pitch_lod = dstImageInfo->slicePitch;

    if (srcImageInfo->num_mip_levels > 1)
    {
        size_t src_width_lod = 1 /*srcImageInfo->width*/;
        size_t src_height_lod = 1 /*srcImageInfo->height*/;

        switch (srcImageInfo->type)
        {
            case CL_MEM_OBJECT_IMAGE1D:
                src_lod = sourcePos[1];
                sourcePos_lod[1] = sourcePos_lod[2] = 0;
                src_width_lod = (srcImageInfo->width >> src_lod)
                    ? (srcImageInfo->width >> src_lod)
                    : 1;
                break;
            case CL_MEM_OBJECT_IMAGE1D_ARRAY:
            case CL_MEM_OBJECT_IMAGE2D:
                src_lod = sourcePos[2];
                sourcePos_lod[1] = sourcePos[1];
                sourcePos_lod[2] = 0;
                src_width_lod = (srcImageInfo->width >> src_lod)
                    ? (srcImageInfo->width >> src_lod)
                    : 1;
                if (srcImageInfo->type == CL_MEM_OBJECT_IMAGE2D)
                    src_height_lod = (srcImageInfo->height >> src_lod)
                        ? (srcImageInfo->height >> src_lod)
                        : 1;
                break;
            case CL_MEM_OBJECT_IMAGE2D_ARRAY:
            case CL_MEM_OBJECT_IMAGE3D:
                src_lod = sourcePos[3];
                sourcePos_lod[1] = sourcePos[1];
                sourcePos_lod[2] = sourcePos[2];
                src_width_lod = (srcImageInfo->width >> src_lod)
                    ? (srcImageInfo->width >> src_lod)
                    : 1;
                src_height_lod = (srcImageInfo->height >> src_lod)
                    ? (srcImageInfo->height >> src_lod)
                    : 1;
                break;
        }
        src_mip_level_offset = compute_mip_level_offset(srcImageInfo, src_lod);
        src_row_pitch_lod =
            src_width_lod * get_pixel_size(srcImageInfo->format);
        src_slice_pitch_lod = src_row_pitch_lod * src_height_lod;
    }

    if (dstImageInfo->num_mip_levels > 1)
    {
        size_t dst_width_lod = 1 /*dstImageInfo->width*/;
        size_t dst_height_lod = 1 /*dstImageInfo->height*/;
        switch (dstImageInfo->type)
        {
            case CL_MEM_OBJECT_IMAGE1D:
                dst_lod = destPos[1];
                destPos_lod[1] = destPos_lod[2] = 0;
                dst_width_lod = (dstImageInfo->width >> dst_lod)
                    ? (dstImageInfo->width >> dst_lod)
                    : 1;
                break;
            case CL_MEM_OBJECT_IMAGE1D_ARRAY:
            case CL_MEM_OBJECT_IMAGE2D:
                dst_lod = destPos[2];
                destPos_lod[1] = destPos[1];
                destPos_lod[2] = 0;
                dst_width_lod = (dstImageInfo->width >> dst_lod)
                    ? (dstImageInfo->width >> dst_lod)
                    : 1;
                if (dstImageInfo->type == CL_MEM_OBJECT_IMAGE2D)
                    dst_height_lod = (dstImageInfo->height >> dst_lod)
                        ? (dstImageInfo->height >> dst_lod)
                        : 1;
                break;
            case CL_MEM_OBJECT_IMAGE2D_ARRAY:
            case CL_MEM_OBJECT_IMAGE3D:
                dst_lod = destPos[3];
                destPos_lod[1] = destPos[1];
                destPos_lod[2] = destPos[2];
                dst_width_lod = (dstImageInfo->width >> dst_lod)
                    ? (dstImageInfo->width >> dst_lod)
                    : 1;
                dst_height_lod = (dstImageInfo->height >> dst_lod)
                    ? (dstImageInfo->height >> dst_lod)
                    : 1;
                break;
        }
        dst_mip_level_offset = compute_mip_level_offset(dstImageInfo, dst_lod);
        dst_row_pitch_lod =
            dst_width_lod * get_pixel_size(dstImageInfo->format);
        dst_slice_pitch_lod = dst_row_pitch_lod * dst_height_lod;
    }

    // Get initial pointers
    char *sourcePtr = (char *)imageValues
        + sourcePos_lod[2] * src_slice_pitch_lod
        + sourcePos_lod[1] * src_row_pitch_lod + pixelSize * sourcePos_lod[0]
        + src_mip_level_offset;
    char *destPtr = (char *)destImageValues
        + destPos_lod[2] * dst_slice_pitch_lod
        + destPos_lod[1] * dst_row_pitch_lod + pixelSize * destPos_lod[0]
        + dst_mip_level_offset;

    for (size_t z = 0; z < (regionSize[2] > 0 ? regionSize[2] : 1); z++)
    {
        char *rowSourcePtr = sourcePtr;
        char *rowDestPtr = destPtr;
        for (size_t y = 0; y < regionSize[1]; y++)
        {
            memcpy(rowDestPtr, rowSourcePtr, pixelSize * regionSize[0]);
            rowSourcePtr += src_row_pitch_lod;
            rowDestPtr += dst_row_pitch_lod;
        }

        sourcePtr += src_slice_pitch_lod;
        destPtr += dst_slice_pitch_lod;
    }
}

float random_float(float low, float high, MTdata d)
{
    float t = (float)genrand_real1(d);
    return (1.0f - t) * low + t * high;
}

CoordWalker::CoordWalker(void *coords, bool useFloats, size_t vecSize)
{
    if (useFloats)
    {
        mFloatCoords = (cl_float *)coords;
        mIntCoords = NULL;
    }
    else
    {
        mFloatCoords = NULL;
        mIntCoords = (cl_int *)coords;
    }
    mVecSize = vecSize;
}

CoordWalker::~CoordWalker() {}

cl_float CoordWalker::Get(size_t idx, size_t el)
{
    if (mIntCoords != NULL)
        return (cl_float)mIntCoords[idx * mVecSize + el];
    else
        return mFloatCoords[idx * mVecSize + el];
}


void print_read_header(const cl_image_format *format,
                       image_sampler_data *sampler, bool err, int t)
{
    const char *addressMode = NULL;
    const char *normalizedNames[2] = { "UNNORMALIZED", "NORMALIZED" };

    if (sampler->addressing_mode == CL_ADDRESS_CLAMP)
        addressMode = "CL_ADDRESS_CLAMP";
    else if (sampler->addressing_mode == CL_ADDRESS_CLAMP_TO_EDGE)
        addressMode = "CL_ADDRESS_CLAMP_TO_EDGE";
    else if (sampler->addressing_mode == CL_ADDRESS_REPEAT)
        addressMode = "CL_ADDRESS_REPEAT";
    else if (sampler->addressing_mode == CL_ADDRESS_MIRRORED_REPEAT)
        addressMode = "CL_ADDRESS_MIRRORED_REPEAT";
    else
        addressMode = "CL_ADDRESS_NONE";

    if (t)
    {
        if (err)
            log_error("[%-7s %-24s %d] - %s - %s - %s - %s\n",
                      GetChannelOrderName(format->image_channel_order),
                      GetChannelTypeName(format->image_channel_data_type),
                      (int)get_format_channel_count(format),
                      sampler->filter_mode == CL_FILTER_NEAREST
                          ? "CL_FILTER_NEAREST"
                          : "CL_FILTER_LINEAR",
                      addressMode,
                      normalizedNames[sampler->normalized_coords ? 1 : 0],
                      t == 1 ? "TRANSPOSED" : "NON-TRANSPOSED");
        else
            log_info("[%-7s %-24s %d] - %s - %s - %s - %s\n",
                     GetChannelOrderName(format->image_channel_order),
                     GetChannelTypeName(format->image_channel_data_type),
                     (int)get_format_channel_count(format),
                     sampler->filter_mode == CL_FILTER_NEAREST
                         ? "CL_FILTER_NEAREST"
                         : "CL_FILTER_LINEAR",
                     addressMode,
                     normalizedNames[sampler->normalized_coords ? 1 : 0],
                     t == 1 ? "TRANSPOSED" : "NON-TRANSPOSED");
    }
    else
    {
        if (err)
            log_error("[%-7s %-24s %d] - %s - %s - %s\n",
                      GetChannelOrderName(format->image_channel_order),
                      GetChannelTypeName(format->image_channel_data_type),
                      (int)get_format_channel_count(format),
                      sampler->filter_mode == CL_FILTER_NEAREST
                          ? "CL_FILTER_NEAREST"
                          : "CL_FILTER_LINEAR",
                      addressMode,
                      normalizedNames[sampler->normalized_coords ? 1 : 0]);
        else
            log_info("[%-7s %-24s %d] - %s - %s - %s\n",
                     GetChannelOrderName(format->image_channel_order),
                     GetChannelTypeName(format->image_channel_data_type),
                     (int)get_format_channel_count(format),
                     sampler->filter_mode == CL_FILTER_NEAREST
                         ? "CL_FILTER_NEAREST"
                         : "CL_FILTER_LINEAR",
                     addressMode,
                     normalizedNames[sampler->normalized_coords ? 1 : 0]);
    }
}

void print_write_header(const cl_image_format *format, bool err = false)
{
    if (err)
        log_error("[%-7s %-24s %d]\n",
                  GetChannelOrderName(format->image_channel_order),
                  GetChannelTypeName(format->image_channel_data_type),
                  (int)get_format_channel_count(format));
    else
        log_info("[%-7s %-24s %d]\n",
                 GetChannelOrderName(format->image_channel_order),
                 GetChannelTypeName(format->image_channel_data_type),
                 (int)get_format_channel_count(format));
}


void print_header(const cl_image_format *format, bool err = false)
{
    if (err)
    {
        log_error("[%-7s %-24s %d]\n",
                  GetChannelOrderName(format->image_channel_order),
                  GetChannelTypeName(format->image_channel_data_type),
                  (int)get_format_channel_count(format));
    }
    else
    {
        log_info("[%-7s %-24s %d]\n",
                 GetChannelOrderName(format->image_channel_order),
                 GetChannelTypeName(format->image_channel_data_type),
                 (int)get_format_channel_count(format));
    }
}

bool find_format(cl_image_format *formatList, unsigned int numFormats,
                 cl_image_format *formatToFind)
{
    for (unsigned int i = 0; i < numFormats; i++)
    {
        if (formatList[i].image_channel_order
                == formatToFind->image_channel_order
            && formatList[i].image_channel_data_type
                == formatToFind->image_channel_data_type)
            return true;
    }
    return false;
}

void build_required_image_formats(
    cl_mem_flags flags, cl_mem_object_type image_type, cl_device_id device,
    std::vector<cl_image_format> &formatsToSupport)
{
    formatsToSupport.clear();

    // Minimum list of supported image formats for reading or writing (embedded
    // profile)
    static std::vector<cl_image_format> embeddedProfile_readOrWrite{
        // clang-format off
        { CL_RGBA, CL_UNORM_INT8 },
        { CL_RGBA, CL_UNORM_INT16 },
        { CL_RGBA, CL_SIGNED_INT8 },
        { CL_RGBA, CL_SIGNED_INT16 },
        { CL_RGBA, CL_SIGNED_INT32 },
        { CL_RGBA, CL_UNSIGNED_INT8 },
        { CL_RGBA, CL_UNSIGNED_INT16 },
        { CL_RGBA, CL_UNSIGNED_INT32 },
        { CL_RGBA, CL_HALF_FLOAT },
        { CL_RGBA, CL_FLOAT },
        // clang-format on
    };

    // Minimum list of required image formats for reading or writing
    // num_channels, for all image types.
    static std::vector<cl_image_format> fullProfile_readOrWrite{
        // clang-format off
        { CL_RGBA, CL_UNORM_INT8 },
        { CL_RGBA, CL_UNORM_INT16 },
        { CL_RGBA, CL_SIGNED_INT8 },
        { CL_RGBA, CL_SIGNED_INT16 },
        { CL_RGBA, CL_SIGNED_INT32 },
        { CL_RGBA, CL_UNSIGNED_INT8 },
        { CL_RGBA, CL_UNSIGNED_INT16 },
        { CL_RGBA, CL_UNSIGNED_INT32 },
        { CL_RGBA, CL_HALF_FLOAT },
        { CL_RGBA, CL_FLOAT },
        { CL_BGRA, CL_UNORM_INT8 },
        // clang-format on
    };

    // Minimum list of supported image formats for reading or writing
    // (OpenCL 2.0, 2.1, or 2.2), for all image types.
    static std::vector<cl_image_format> fullProfile_2x_readOrWrite{
        // clang-format off
        { CL_R, CL_UNORM_INT8 },
        { CL_R, CL_UNORM_INT16 },
        { CL_R, CL_SNORM_INT8 },
        { CL_R, CL_SNORM_INT16 },
        { CL_R, CL_SIGNED_INT8 },
        { CL_R, CL_SIGNED_INT16 },
        { CL_R, CL_SIGNED_INT32 },
        { CL_R, CL_UNSIGNED_INT8 },
        { CL_R, CL_UNSIGNED_INT16 },
        { CL_R, CL_UNSIGNED_INT32 },
        { CL_R, CL_HALF_FLOAT },
        { CL_R, CL_FLOAT },
        { CL_RG, CL_UNORM_INT8 },
        { CL_RG, CL_UNORM_INT16 },
        { CL_RG, CL_SNORM_INT8 },
        { CL_RG, CL_SNORM_INT16 },
        { CL_RG, CL_SIGNED_INT8 },
        { CL_RG, CL_SIGNED_INT16 },
        { CL_RG, CL_SIGNED_INT32 },
        { CL_RG, CL_UNSIGNED_INT8 },
        { CL_RG, CL_UNSIGNED_INT16 },
        { CL_RG, CL_UNSIGNED_INT32 },
        { CL_RG, CL_HALF_FLOAT },
        { CL_RG, CL_FLOAT },
        { CL_RGBA, CL_UNORM_INT8 },
        { CL_RGBA, CL_UNORM_INT16 },
        { CL_RGBA, CL_SNORM_INT8 },
        { CL_RGBA, CL_SNORM_INT16 },
        { CL_RGBA, CL_SIGNED_INT8 },
        { CL_RGBA, CL_SIGNED_INT16 },
        { CL_RGBA, CL_SIGNED_INT32 },
        { CL_RGBA, CL_UNSIGNED_INT8 },
        { CL_RGBA, CL_UNSIGNED_INT16 },
        { CL_RGBA, CL_UNSIGNED_INT32 },
        { CL_RGBA, CL_HALF_FLOAT },
        { CL_RGBA, CL_FLOAT },
        { CL_BGRA, CL_UNORM_INT8 },
        // clang-format on
    };

    // Conditional addition to the 2x readOrWrite table:
    // Support for the CL_DEPTH image channel order is required only for 2D
    // images and 2D image arrays.
    static std::vector<cl_image_format> fullProfile_2x_readOrWrite_Depth{
        // clang-format off
        { CL_DEPTH, CL_UNORM_INT16 },
        { CL_DEPTH, CL_FLOAT },
        // clang-format on
    };

    // Conditional addition to the 2x readOrWrite table:
    // Support for reading from the CL_sRGBA image channel order is optional for
    // 1D image buffers. Support for writing to the CL_sRGBA image channel order
    // is optional for all image types.
    static std::vector<cl_image_format> fullProfile_2x_readOrWrite_srgb{
        { CL_sRGBA, CL_UNORM_INT8 },
    };

    // Minimum list of required image formats for reading and writing.
    static std::vector<cl_image_format> fullProfile_readAndWrite{
        // clang-format off
        { CL_R, CL_UNORM_INT8 },
        { CL_R, CL_SIGNED_INT8 },
        { CL_R, CL_SIGNED_INT16 },
        { CL_R, CL_SIGNED_INT32 },
        { CL_R, CL_UNSIGNED_INT8 },
        { CL_R, CL_UNSIGNED_INT16 },
        { CL_R, CL_UNSIGNED_INT32 },
        { CL_R, CL_HALF_FLOAT },
        { CL_R, CL_FLOAT },
        { CL_RGBA, CL_UNORM_INT8 },
        { CL_RGBA, CL_SIGNED_INT8 },
        { CL_RGBA, CL_SIGNED_INT16 },
        { CL_RGBA, CL_SIGNED_INT32 },
        { CL_RGBA, CL_UNSIGNED_INT8 },
        { CL_RGBA, CL_UNSIGNED_INT16 },
        { CL_RGBA, CL_UNSIGNED_INT32 },
        { CL_RGBA, CL_HALF_FLOAT },
        { CL_RGBA, CL_FLOAT },
        // clang-format on
    };

    // Embedded profile
    if (gIsEmbedded)
    {
        copy(embeddedProfile_readOrWrite.begin(),
             embeddedProfile_readOrWrite.end(),
             back_inserter(formatsToSupport));
    }
    // Full profile
    else
    {
        Version version = get_device_cl_version(device);
        if (version < Version(2, 0) || version >= Version(3, 0))
        {
            // Full profile, OpenCL 1.2 or 3.0.
            if (flags & CL_MEM_KERNEL_READ_AND_WRITE)
            {
                // Note: assumes that read-write images are supported!
                copy(fullProfile_readAndWrite.begin(),
                     fullProfile_readAndWrite.end(),
                     back_inserter(formatsToSupport));
            }
            else
            {
                copy(fullProfile_readOrWrite.begin(),
                     fullProfile_readOrWrite.end(),
                     back_inserter(formatsToSupport));
            }
        }
        else
        {
            // Full profile, OpenCL 2.0, 2.1, 2.2.
            if (flags & CL_MEM_KERNEL_READ_AND_WRITE)
            {
                copy(fullProfile_readAndWrite.begin(),
                     fullProfile_readAndWrite.end(),
                     back_inserter(formatsToSupport));
            }
            else
            {
                copy(fullProfile_2x_readOrWrite.begin(),
                     fullProfile_2x_readOrWrite.end(),
                     back_inserter(formatsToSupport));

                // Support for the CL_DEPTH image channel order is required only
                // for 2D images and 2D image arrays.
                if (image_type == CL_MEM_OBJECT_IMAGE2D
                    || image_type == CL_MEM_OBJECT_IMAGE2D_ARRAY)
                {
                    copy(fullProfile_2x_readOrWrite_Depth.begin(),
                         fullProfile_2x_readOrWrite_Depth.end(),
                         back_inserter(formatsToSupport));
                }

                // Support for reading from the CL_sRGBA image channel order is
                // optional for 1D image buffers. Support for writing to the
                // CL_sRGBA image channel order is optional for all image types.
                if (image_type != CL_MEM_OBJECT_IMAGE1D_BUFFER
                    && flags == CL_MEM_READ_ONLY)
                {
                    copy(fullProfile_2x_readOrWrite_srgb.begin(),
                         fullProfile_2x_readOrWrite_srgb.end(),
                         back_inserter(formatsToSupport));
                }
            }
        }
    }
}

bool is_image_format_required(cl_image_format format, cl_mem_flags flags,
                              cl_mem_object_type image_type,
                              cl_device_id device)
{
    std::vector<cl_image_format> formatsToSupport;
    build_required_image_formats(flags, image_type, device, formatsToSupport);

    for (auto &formatItr : formatsToSupport)
    {
        if (formatItr.image_channel_order == format.image_channel_order
            && formatItr.image_channel_data_type
                == format.image_channel_data_type)
        {
            return true;
        }
    }

    return false;
}

cl_uint compute_max_mip_levels(size_t width, size_t height, size_t depth)
{
    cl_uint retMaxMipLevels = 0;
    size_t max_dim = 0;

    max_dim = width;
    max_dim = height > max_dim ? height : max_dim;
    max_dim = depth > max_dim ? depth : max_dim;

    while (max_dim)
    {
        retMaxMipLevels++;
        max_dim >>= 1;
    }
    return retMaxMipLevels;
}

cl_ulong compute_mipmapped_image_size(image_descriptor imageInfo)
{
    cl_ulong retSize = 0;
    size_t curr_width, curr_height, curr_depth, curr_array_size;
    curr_width = imageInfo.width;
    curr_height = imageInfo.height;
    curr_depth = imageInfo.depth;
    curr_array_size = imageInfo.arraySize;

    for (int i = 0; i < (int)imageInfo.num_mip_levels; i++)
    {
        switch (imageInfo.type)
        {
            case CL_MEM_OBJECT_IMAGE3D:
                retSize += (cl_ulong)curr_width * curr_height * curr_depth
                    * get_pixel_size(imageInfo.format);
                break;
            case CL_MEM_OBJECT_IMAGE2D:
                retSize += (cl_ulong)curr_width * curr_height
                    * get_pixel_size(imageInfo.format);
                break;
            case CL_MEM_OBJECT_IMAGE1D:
                retSize +=
                    (cl_ulong)curr_width * get_pixel_size(imageInfo.format);
                break;
            case CL_MEM_OBJECT_IMAGE1D_ARRAY:
                retSize += (cl_ulong)curr_width * curr_array_size
                    * get_pixel_size(imageInfo.format);
                break;
            case CL_MEM_OBJECT_IMAGE2D_ARRAY:
                retSize += (cl_ulong)curr_width * curr_height * curr_array_size
                    * get_pixel_size(imageInfo.format);
                break;
        }

        switch (imageInfo.type)
        {
            case CL_MEM_OBJECT_IMAGE3D:
                curr_depth = curr_depth >> 1 ? curr_depth >> 1 : 1;
            case CL_MEM_OBJECT_IMAGE2D:
            case CL_MEM_OBJECT_IMAGE2D_ARRAY:
                curr_height = curr_height >> 1 ? curr_height >> 1 : 1;
            case CL_MEM_OBJECT_IMAGE1D:
            case CL_MEM_OBJECT_IMAGE1D_ARRAY:
                curr_width = curr_width >> 1 ? curr_width >> 1 : 1;
        }
    }

    return retSize;
}

size_t compute_mip_level_offset(image_descriptor *imageInfo, size_t lod)
{
    size_t retOffset = 0;
    size_t width, height, depth;
    width = imageInfo->width;
    height = imageInfo->height;
    depth = imageInfo->depth;

    for (size_t i = 0; i < lod; i++)
    {
        switch (imageInfo->type)
        {
            case CL_MEM_OBJECT_IMAGE2D_ARRAY:
                retOffset += (size_t)width * height * imageInfo->arraySize
                    * get_pixel_size(imageInfo->format);
                break;
            case CL_MEM_OBJECT_IMAGE3D:
                retOffset += (size_t)width * height * depth
                    * get_pixel_size(imageInfo->format);
                break;
            case CL_MEM_OBJECT_IMAGE1D_ARRAY:
                retOffset += (size_t)width * imageInfo->arraySize
                    * get_pixel_size(imageInfo->format);
                break;
            case CL_MEM_OBJECT_IMAGE2D:
                retOffset +=
                    (size_t)width * height * get_pixel_size(imageInfo->format);
                break;
            case CL_MEM_OBJECT_IMAGE1D:
                retOffset += (size_t)width * get_pixel_size(imageInfo->format);
                break;
        }

        // Compute next lod dimensions
        switch (imageInfo->type)
        {
            case CL_MEM_OBJECT_IMAGE3D: depth = (depth >> 1) ? (depth >> 1) : 1;
            case CL_MEM_OBJECT_IMAGE2D:
            case CL_MEM_OBJECT_IMAGE2D_ARRAY:
                height = (height >> 1) ? (height >> 1) : 1;
            case CL_MEM_OBJECT_IMAGE1D_ARRAY:
            case CL_MEM_OBJECT_IMAGE1D: width = (width >> 1) ? (width >> 1) : 1;
        }
    }
    return retOffset;
}

const char *convert_image_type_to_string(cl_mem_object_type image_type)
{
    switch (image_type)
    {
        case CL_MEM_OBJECT_IMAGE1D: return "1D";
        case CL_MEM_OBJECT_IMAGE2D: return "2D";
        case CL_MEM_OBJECT_IMAGE3D: return "3D";
        case CL_MEM_OBJECT_IMAGE1D_ARRAY: return "1D array";
        case CL_MEM_OBJECT_IMAGE2D_ARRAY: return "2D array";
        case CL_MEM_OBJECT_IMAGE1D_BUFFER: return "1D image buffer";
        default: return "unrecognized object type";
    }
}