xref: /aosp_15_r20/external/deqp/modules/gles31/functional/es31fProgramInterfaceDefinition.cpp (revision 35238bce31c2a825756842865a792f8cf7f89930)

/*-------------------------------------------------------------------------
 * drawElements Quality Program OpenGL ES 3.1 Module
 * -------------------------------------------------
 *
 * Copyright 2014 The Android Open Source Project
 *
 * 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.
 *
 *//*!
 * \file
 * \brief Program interface
 *//*--------------------------------------------------------------------*/

#include "es31fProgramInterfaceDefinition.hpp"
#include "es31fProgramInterfaceDefinitionUtil.hpp"
#include "gluVarType.hpp"
#include "gluShaderProgram.hpp"
#include "deSTLUtil.hpp"
#include "deStringUtil.hpp"
#include "glwEnums.hpp"

#include <set>

namespace deqp
{
namespace gles31
{
namespace Functional
{
namespace ProgramInterfaceDefinition
{
namespace
{

static const glu::ShaderType s_shaderStageOrder[] = {
    glu::SHADERTYPE_COMPUTE,

    glu::SHADERTYPE_VERTEX,
    glu::SHADERTYPE_TESSELLATION_CONTROL,
    glu::SHADERTYPE_TESSELLATION_EVALUATION,
    glu::SHADERTYPE_GEOMETRY,
    glu::SHADERTYPE_FRAGMENT,

    glu::SHADERTYPE_RAYGEN,
    glu::SHADERTYPE_ANY_HIT,
    glu::SHADERTYPE_CLOSEST_HIT,
    glu::SHADERTYPE_MISS,
    glu::SHADERTYPE_INTERSECTION,
    glu::SHADERTYPE_CALLABLE,

    glu::SHADERTYPE_TASK,
    glu::SHADERTYPE_MESH,
};

// s_shaderStageOrder does not contain ShaderType_LAST
DE_STATIC_ASSERT(DE_LENGTH_OF_ARRAY(s_shaderStageOrder) == glu::SHADERTYPE_LAST);

static bool containsMatchingSubtype(const glu::VarType &varType, bool (*predicate)(glu::DataType))
{
    if (varType.isBasicType() && predicate(varType.getBasicType()))
        return true;

    if (varType.isArrayType())
        return containsMatchingSubtype(varType.getElementType(), predicate);

    if (varType.isStructType())
        for (int memberNdx = 0; memberNdx < varType.getStructPtr()->getNumMembers(); ++memberNdx)
            if (containsMatchingSubtype(varType.getStructPtr()->getMember(memberNdx).getType(), predicate))
                return true;

    return false;
}

static bool containsMatchingSubtype(const std::vector<glu::VariableDeclaration> &decls,
                                    bool (*predicate)(glu::DataType))
{
    for (int varNdx = 0; varNdx < (int)decls.size(); ++varNdx)
        if (containsMatchingSubtype(decls[varNdx].varType, predicate))
            return true;
    return false;
}

static bool isOpaqueType(glu::DataType type)
{
    return glu::isDataTypeAtomicCounter(type) || glu::isDataTypeImage(type) || glu::isDataTypeSampler(type);
}

static int getShaderStageIndex(glu::ShaderType stage)
{
    const glu::ShaderType *const it =
        std::find(DE_ARRAY_BEGIN(s_shaderStageOrder), DE_ARRAY_END(s_shaderStageOrder), stage);

    if (it == DE_ARRAY_END(s_shaderStageOrder))
        return -1;
    else
    {
        const int index = (int)(it - DE_ARRAY_BEGIN(s_shaderStageOrder));
        return index;
    }
}

} // namespace

Shader::Shader(glu::ShaderType type, glu::GLSLVersion version) : m_shaderType(type), m_version(version)
{
}

Shader::~Shader(void)
{
}

static bool isIllegalVertexInput(const glu::VarType &varType)
{
    // booleans, opaque types, arrays, structs are not allowed as inputs
    if (!varType.isBasicType())
        return true;
    if (glu::isDataTypeBoolOrBVec(varType.getBasicType()))
        return true;
    return false;
}

static bool isIllegalVertexOutput(const glu::VarType &varType, bool insideAStruct = false, bool insideAnArray = false)
{
    // booleans, opaque types, arrays of arrays, arrays of structs, array in struct, struct struct are not allowed as vertex outputs

    if (varType.isBasicType())
    {
        const bool isOpaqueType = !glu::isDataTypeScalar(varType.getBasicType()) &&
                                  !glu::isDataTypeVector(varType.getBasicType()) &&
                                  !glu::isDataTypeMatrix(varType.getBasicType());

        if (glu::isDataTypeBoolOrBVec(varType.getBasicType()))
            return true;

        if (isOpaqueType)
            return true;

        return false;
    }
    else if (varType.isArrayType())
    {
        if (insideAnArray || insideAStruct)
            return true;

        return isIllegalVertexOutput(varType.getElementType(), insideAStruct, true);
    }
    else if (varType.isStructType())
    {
        if (insideAnArray || insideAStruct)
            return true;

        for (int ndx = 0; ndx < varType.getStructPtr()->getNumMembers(); ++ndx)
            if (isIllegalVertexOutput(varType.getStructPtr()->getMember(ndx).getType(), true, insideAnArray))
                return true;

        return false;
    }
    else
    {
        DE_ASSERT(false);
        return true;
    }
}

static bool isIllegalFragmentInput(const glu::VarType &varType)
{
    return isIllegalVertexOutput(varType);
}

static bool isIllegalFragmentOutput(const glu::VarType &varType, bool insideAnArray = false)
{
    // booleans, opaque types, matrices, structs, arrays of arrays are not allowed as outputs

    if (varType.isBasicType())
    {
        const bool isOpaqueType = !glu::isDataTypeScalar(varType.getBasicType()) &&
                                  !glu::isDataTypeVector(varType.getBasicType()) &&
                                  !glu::isDataTypeMatrix(varType.getBasicType());

        if (glu::isDataTypeBoolOrBVec(varType.getBasicType()) || isOpaqueType ||
            glu::isDataTypeMatrix(varType.getBasicType()))
            return true;
        return false;
    }
    else if (varType.isArrayType())
    {
        if (insideAnArray)
            return true;
        return isIllegalFragmentOutput(varType.getElementType(), true);
    }
    else if (varType.isStructType())
        return true;
    else
    {
        DE_ASSERT(false);
        return true;
    }
}

static bool isTypeIntegerOrContainsIntegers(const glu::VarType &varType)
{
    if (varType.isBasicType())
        return glu::isDataTypeIntOrIVec(varType.getBasicType()) || glu::isDataTypeUintOrUVec(varType.getBasicType());
    else if (varType.isArrayType())
        return isTypeIntegerOrContainsIntegers(varType.getElementType());
    else if (varType.isStructType())
    {
        for (int ndx = 0; ndx < varType.getStructPtr()->getNumMembers(); ++ndx)
            if (isTypeIntegerOrContainsIntegers(varType.getStructPtr()->getMember(ndx).getType()))
                return true;
        return false;
    }
    else
    {
        DE_ASSERT(false);
        return true;
    }
}

bool Shader::isValid(void) const
{
    // Default block variables
    {
        for (int varNdx = 0; varNdx < (int)m_defaultBlock.variables.size(); ++varNdx)
        {
            // atomic declaration in the default block without binding
            if (m_defaultBlock.variables[varNdx].layout.binding == -1 &&
                containsMatchingSubtype(m_defaultBlock.variables[varNdx].varType, glu::isDataTypeAtomicCounter))
                return false;

            // atomic declaration in a struct
            if (m_defaultBlock.variables[varNdx].varType.isStructType() &&
                containsMatchingSubtype(m_defaultBlock.variables[varNdx].varType, glu::isDataTypeAtomicCounter))
                return false;

            // Unsupported layout qualifiers

            if (m_defaultBlock.variables[varNdx].layout.matrixOrder != glu::MATRIXORDER_LAST)
                return false;

            if (containsMatchingSubtype(m_defaultBlock.variables[varNdx].varType, glu::isDataTypeSampler))
            {
                const glu::Layout layoutWithLocationAndBinding(m_defaultBlock.variables[varNdx].layout.location,
                                                               m_defaultBlock.variables[varNdx].layout.binding);

                if (m_defaultBlock.variables[varNdx].layout != layoutWithLocationAndBinding)
                    return false;
            }
        }
    }

    // Interface blocks
    {
        for (int interfaceNdx = 0; interfaceNdx < (int)m_defaultBlock.interfaceBlocks.size(); ++interfaceNdx)
        {
            // ES31 disallows interface block array arrays
            if (m_defaultBlock.interfaceBlocks[interfaceNdx].dimensions.size() > 1)
                return false;

            // Interface block arrays must have instance name
            if (!m_defaultBlock.interfaceBlocks[interfaceNdx].dimensions.empty() &&
                m_defaultBlock.interfaceBlocks[interfaceNdx].instanceName.empty())
                return false;

            // Opaque types in interface block
            if (containsMatchingSubtype(m_defaultBlock.interfaceBlocks[interfaceNdx].variables, isOpaqueType))
                return false;
        }
    }

    // Shader type specific

    if (m_shaderType == glu::SHADERTYPE_VERTEX)
    {
        for (int varNdx = 0; varNdx < (int)m_defaultBlock.variables.size(); ++varNdx)
        {
            if (m_defaultBlock.variables[varNdx].storage == glu::STORAGE_IN &&
                isIllegalVertexInput(m_defaultBlock.variables[varNdx].varType))
                return false;
            if (m_defaultBlock.variables[varNdx].storage == glu::STORAGE_OUT &&
                isIllegalVertexOutput(m_defaultBlock.variables[varNdx].varType))
                return false;
            if (m_defaultBlock.variables[varNdx].storage == glu::STORAGE_OUT &&
                m_defaultBlock.variables[varNdx].interpolation != glu::INTERPOLATION_FLAT &&
                isTypeIntegerOrContainsIntegers(m_defaultBlock.variables[varNdx].varType))
                return false;
        }
        for (int interfaceNdx = 0; interfaceNdx < (int)m_defaultBlock.interfaceBlocks.size(); ++interfaceNdx)
        {
            if (m_defaultBlock.interfaceBlocks[interfaceNdx].storage == glu::STORAGE_IN ||
                m_defaultBlock.interfaceBlocks[interfaceNdx].storage == glu::STORAGE_PATCH_IN ||
                m_defaultBlock.interfaceBlocks[interfaceNdx].storage == glu::STORAGE_PATCH_OUT)
            {
                return false;
            }
        }
    }
    else if (m_shaderType == glu::SHADERTYPE_FRAGMENT)
    {
        for (int varNdx = 0; varNdx < (int)m_defaultBlock.variables.size(); ++varNdx)
        {
            if (m_defaultBlock.variables[varNdx].storage == glu::STORAGE_IN &&
                isIllegalFragmentInput(m_defaultBlock.variables[varNdx].varType))
                return false;
            if (m_defaultBlock.variables[varNdx].storage == glu::STORAGE_IN &&
                m_defaultBlock.variables[varNdx].interpolation != glu::INTERPOLATION_FLAT &&
                isTypeIntegerOrContainsIntegers(m_defaultBlock.variables[varNdx].varType))
                return false;
            if (m_defaultBlock.variables[varNdx].storage == glu::STORAGE_OUT &&
                isIllegalFragmentOutput(m_defaultBlock.variables[varNdx].varType))
                return false;
        }
        for (int interfaceNdx = 0; interfaceNdx < (int)m_defaultBlock.interfaceBlocks.size(); ++interfaceNdx)
        {
            if (m_defaultBlock.interfaceBlocks[interfaceNdx].storage == glu::STORAGE_PATCH_IN ||
                m_defaultBlock.interfaceBlocks[interfaceNdx].storage == glu::STORAGE_OUT ||
                m_defaultBlock.interfaceBlocks[interfaceNdx].storage == glu::STORAGE_PATCH_OUT)
            {
                return false;
            }
        }
    }
    else if (m_shaderType == glu::SHADERTYPE_COMPUTE)
    {
        for (int varNdx = 0; varNdx < (int)m_defaultBlock.variables.size(); ++varNdx)
        {
            if (m_defaultBlock.variables[varNdx].storage == glu::STORAGE_IN ||
                m_defaultBlock.variables[varNdx].storage == glu::STORAGE_PATCH_IN ||
                m_defaultBlock.variables[varNdx].storage == glu::STORAGE_OUT ||
                m_defaultBlock.variables[varNdx].storage == glu::STORAGE_PATCH_OUT)
            {
                return false;
            }
        }
        for (int interfaceNdx = 0; interfaceNdx < (int)m_defaultBlock.interfaceBlocks.size(); ++interfaceNdx)
        {
            if (m_defaultBlock.interfaceBlocks[interfaceNdx].storage == glu::STORAGE_IN ||
                m_defaultBlock.interfaceBlocks[interfaceNdx].storage == glu::STORAGE_PATCH_IN ||
                m_defaultBlock.interfaceBlocks[interfaceNdx].storage == glu::STORAGE_OUT ||
                m_defaultBlock.interfaceBlocks[interfaceNdx].storage == glu::STORAGE_PATCH_OUT)
            {
                return false;
            }
        }
    }
    else if (m_shaderType == glu::SHADERTYPE_GEOMETRY)
    {
        for (int varNdx = 0; varNdx < (int)m_defaultBlock.variables.size(); ++varNdx)
        {
            if (m_defaultBlock.variables[varNdx].storage == glu::STORAGE_PATCH_IN ||
                m_defaultBlock.variables[varNdx].storage == glu::STORAGE_PATCH_OUT)
            {
                return false;
            }
            // arrayed input
            if (m_defaultBlock.variables[varNdx].storage == glu::STORAGE_IN &&
                !m_defaultBlock.variables[varNdx].varType.isArrayType())
                return false;
        }
        for (int interfaceNdx = 0; interfaceNdx < (int)m_defaultBlock.interfaceBlocks.size(); ++interfaceNdx)
        {
            if (m_defaultBlock.interfaceBlocks[interfaceNdx].storage == glu::STORAGE_PATCH_IN ||
                m_defaultBlock.interfaceBlocks[interfaceNdx].storage == glu::STORAGE_PATCH_OUT)
            {
                return false;
            }
            // arrayed input
            if (m_defaultBlock.interfaceBlocks[interfaceNdx].storage == glu::STORAGE_IN &&
                m_defaultBlock.interfaceBlocks[interfaceNdx].dimensions.empty())
                return false;
        }
    }
    else if (m_shaderType == glu::SHADERTYPE_TESSELLATION_CONTROL)
    {
        for (int varNdx = 0; varNdx < (int)m_defaultBlock.variables.size(); ++varNdx)
        {
            if (m_defaultBlock.variables[varNdx].storage == glu::STORAGE_PATCH_IN)
                return false;
            // arrayed input
            if (m_defaultBlock.variables[varNdx].storage == glu::STORAGE_IN &&
                !m_defaultBlock.variables[varNdx].varType.isArrayType())
                return false;
            // arrayed output
            if (m_defaultBlock.variables[varNdx].storage == glu::STORAGE_OUT &&
                !m_defaultBlock.variables[varNdx].varType.isArrayType())
                return false;
        }
        for (int interfaceNdx = 0; interfaceNdx < (int)m_defaultBlock.interfaceBlocks.size(); ++interfaceNdx)
        {
            if (m_defaultBlock.interfaceBlocks[interfaceNdx].storage == glu::STORAGE_PATCH_IN)
                return false;
            // arrayed input
            if (m_defaultBlock.interfaceBlocks[interfaceNdx].storage == glu::STORAGE_IN &&
                m_defaultBlock.interfaceBlocks[interfaceNdx].dimensions.empty())
                return false;
            // arrayed output
            if (m_defaultBlock.interfaceBlocks[interfaceNdx].storage == glu::STORAGE_OUT &&
                m_defaultBlock.interfaceBlocks[interfaceNdx].dimensions.empty())
                return false;
        }
    }
    else if (m_shaderType == glu::SHADERTYPE_TESSELLATION_EVALUATION)
    {
        for (int varNdx = 0; varNdx < (int)m_defaultBlock.variables.size(); ++varNdx)
        {
            if (m_defaultBlock.variables[varNdx].storage == glu::STORAGE_PATCH_OUT)
                return false;
            // arrayed input
            if (m_defaultBlock.variables[varNdx].storage == glu::STORAGE_IN &&
                !m_defaultBlock.variables[varNdx].varType.isArrayType())
                return false;
        }
        for (int interfaceNdx = 0; interfaceNdx < (int)m_defaultBlock.interfaceBlocks.size(); ++interfaceNdx)
        {
            if (m_defaultBlock.interfaceBlocks[interfaceNdx].storage == glu::STORAGE_PATCH_OUT)
                return false;
            // arrayed input
            if (m_defaultBlock.interfaceBlocks[interfaceNdx].storage == glu::STORAGE_IN &&
                m_defaultBlock.interfaceBlocks[interfaceNdx].dimensions.empty())
                return false;
        }
    }
    else
        DE_ASSERT(false);

    return true;
}

Program::Program(void) : m_separable(false), m_xfbMode(0), m_geoNumOutputVertices(0), m_tessNumOutputVertices(0)
{
}

static void collectStructPtrs(std::set<const glu::StructType *> &dst, const glu::VarType &type)
{
    if (type.isArrayType())
        collectStructPtrs(dst, type.getElementType());
    else if (type.isStructType())
    {
        dst.insert(type.getStructPtr());

        for (int memberNdx = 0; memberNdx < type.getStructPtr()->getNumMembers(); ++memberNdx)
            collectStructPtrs(dst, type.getStructPtr()->getMember(memberNdx).getType());
    }
}

Program::~Program(void)
{
    // delete shader struct types, need to be done by the program since shaders might share struct types
    {
        std::set<const glu::StructType *> structTypes;

        for (int shaderNdx = 0; shaderNdx < (int)m_shaders.size(); ++shaderNdx)
        {
            for (int varNdx = 0; varNdx < (int)m_shaders[shaderNdx]->m_defaultBlock.variables.size(); ++varNdx)
                collectStructPtrs(structTypes, m_shaders[shaderNdx]->m_defaultBlock.variables[varNdx].varType);

            for (int interfaceNdx = 0; interfaceNdx < (int)m_shaders[shaderNdx]->m_defaultBlock.interfaceBlocks.size();
                 ++interfaceNdx)
                for (int varNdx = 0;
                     varNdx < (int)m_shaders[shaderNdx]->m_defaultBlock.interfaceBlocks[interfaceNdx].variables.size();
                     ++varNdx)
                    collectStructPtrs(
                        structTypes,
                        m_shaders[shaderNdx]->m_defaultBlock.interfaceBlocks[interfaceNdx].variables[varNdx].varType);
        }

        for (std::set<const glu::StructType *>::iterator it = structTypes.begin(); it != structTypes.end(); ++it)
            delete *it;
    }

    for (int shaderNdx = 0; shaderNdx < (int)m_shaders.size(); ++shaderNdx)
        delete m_shaders[shaderNdx];
    m_shaders.clear();
}

Shader *Program::addShader(glu::ShaderType type, glu::GLSLVersion version)
{
    DE_ASSERT(type < glu::SHADERTYPE_LAST);

    Shader *shader;

    // make sure push_back() cannot throw
    m_shaders.reserve(m_shaders.size() + 1);

    shader = new Shader(type, version);
    m_shaders.push_back(shader);

    return shader;
}

void Program::setSeparable(bool separable)
{
    m_separable = separable;
}

bool Program::isSeparable(void) const
{
    return m_separable;
}

const std::vector<Shader *> &Program::getShaders(void) const
{
    return m_shaders;
}

glu::ShaderType Program::getFirstStage(void) const
{
    const int nullValue = DE_LENGTH_OF_ARRAY(s_shaderStageOrder);
    int firstStage      = nullValue;

    for (int shaderNdx = 0; shaderNdx < (int)m_shaders.size(); ++shaderNdx)
    {
        const int index = getShaderStageIndex(m_shaders[shaderNdx]->getType());
        if (index != -1)
            firstStage = de::min(firstStage, index);
    }

    if (firstStage == nullValue)
        return glu::SHADERTYPE_LAST;
    else
        return s_shaderStageOrder[firstStage];
}

glu::ShaderType Program::getLastStage(void) const
{
    const int nullValue = -1;
    int lastStage       = nullValue;

    for (int shaderNdx = 0; shaderNdx < (int)m_shaders.size(); ++shaderNdx)
    {
        const int index = getShaderStageIndex(m_shaders[shaderNdx]->getType());
        if (index != -1)
            lastStage = de::max(lastStage, index);
    }

    if (lastStage == nullValue)
        return glu::SHADERTYPE_LAST;
    else
        return s_shaderStageOrder[lastStage];
}

bool Program::hasStage(glu::ShaderType stage) const
{
    for (int shaderNdx = 0; shaderNdx < (int)m_shaders.size(); ++shaderNdx)
    {
        if (m_shaders[shaderNdx]->getType() == stage)
            return true;
    }
    return false;
}

void Program::addTransformFeedbackVarying(const std::string &varName)
{
    m_xfbVaryings.push_back(varName);
}

const std::vector<std::string> &Program::getTransformFeedbackVaryings(void) const
{
    return m_xfbVaryings;
}

void Program::setTransformFeedbackMode(uint32_t mode)
{
    m_xfbMode = mode;
}

uint32_t Program::getTransformFeedbackMode(void) const
{
    return m_xfbMode;
}

uint32_t Program::getGeometryNumOutputVertices(void) const
{
    return m_geoNumOutputVertices;
}

void Program::setGeometryNumOutputVertices(uint32_t vertices)
{
    m_geoNumOutputVertices = vertices;
}

uint32_t Program::getTessellationNumOutputPatchVertices(void) const
{
    return m_tessNumOutputVertices;
}

void Program::setTessellationNumOutputPatchVertices(uint32_t vertices)
{
    m_tessNumOutputVertices = vertices;
}

bool Program::isValid(void) const
{
    const bool isOpenGLES   = (m_shaders.empty()) ? (false) : (glu::glslVersionIsES(m_shaders[0]->getVersion()));
    bool computePresent     = false;
    bool vertexPresent      = false;
    bool fragmentPresent    = false;
    bool tessControlPresent = false;
    bool tessEvalPresent    = false;
    bool geometryPresent    = false;

    if (m_shaders.empty())
        return false;

    for (int ndx = 0; ndx < (int)m_shaders.size(); ++ndx)
        if (!m_shaders[ndx]->isValid())
            return false;

    // same version
    for (int ndx = 1; ndx < (int)m_shaders.size(); ++ndx)
        if (m_shaders[0]->getVersion() != m_shaders[ndx]->getVersion())
            return false;

    for (int ndx = 0; ndx < (int)m_shaders.size(); ++ndx)
    {
        switch (m_shaders[ndx]->getType())
        {
        case glu::SHADERTYPE_COMPUTE:
            computePresent = true;
            break;
        case glu::SHADERTYPE_VERTEX:
            vertexPresent = true;
            break;
        case glu::SHADERTYPE_FRAGMENT:
            fragmentPresent = true;
            break;
        case glu::SHADERTYPE_TESSELLATION_CONTROL:
            tessControlPresent = true;
            break;
        case glu::SHADERTYPE_TESSELLATION_EVALUATION:
            tessEvalPresent = true;
            break;
        case glu::SHADERTYPE_GEOMETRY:
            geometryPresent = true;
            break;
        default:
            DE_ASSERT(false);
            break;
        }
    }
    // compute present -> no other stages present
    {
        const bool nonComputePresent =
            vertexPresent || fragmentPresent || tessControlPresent || tessEvalPresent || geometryPresent;
        if (computePresent && nonComputePresent)
            return false;
    }

    // must contain both vertex and fragment shaders
    if (!computePresent && !m_separable)
    {
        if (!vertexPresent || !fragmentPresent)
            return false;
    }

    // tess.Eval present <=> tess.Control present
    if (!m_separable)
    {
        if (tessEvalPresent != tessControlPresent)
            return false;
    }

    if ((m_tessNumOutputVertices != 0) != (tessControlPresent || tessEvalPresent))
        return false;

    if ((m_geoNumOutputVertices != 0) != geometryPresent)
        return false;

    for (int ndx = 0; ndx < (int)m_xfbVaryings.size(); ++ndx)
    {
        // user-defined
        if (!de::beginsWith(m_xfbVaryings[ndx], "gl_"))
        {
            std::vector<ProgramInterfaceDefinition::VariablePathComponent> path;
            if (!findProgramVariablePathByPathName(path, this, m_xfbVaryings[ndx],
                                                   VariableSearchFilter::createShaderTypeStorageFilter(
                                                       getProgramTransformFeedbackStage(this), glu::STORAGE_OUT)))
                return false;
            if (!path.back().isVariableType())
                return false;

            // Khronos bug #12787 disallowed capturing whole structs in OpenGL ES.
            if (path.back().getVariableType()->isStructType() && isOpenGLES)
                return false;
        }
    }

    return true;
}

} // namespace ProgramInterfaceDefinition
} // namespace Functional
} // namespace gles31
} // namespace deqp