1 /*-------------------------------------------------------------------------
2 * drawElements Internal Test Module
3 * ---------------------------------
4 *
5 * Copyright 2015 The Android Open Source Project
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 *
19 *//*!
20 * \file
21 * \brief 8-bit sRGB conversion test.
22 *//*--------------------------------------------------------------------*/
23
24 #include "ditSRGB8ConversionTest.hpp"
25
26 #include "tcuFloat.hpp"
27 #include "tcuTestLog.hpp"
28 #include "tcuTextureUtil.hpp"
29 #include "tcuVectorUtil.hpp"
30
31 namespace dit
32 {
33 namespace
34 {
35
calculateDiscreteFloatDistance(float a,float b)36 uint32_t calculateDiscreteFloatDistance(float a, float b)
37 {
38 const uint32_t au = tcu::Float32(a).bits();
39 const uint32_t bu = tcu::Float32(b).bits();
40
41 const bool asign = (au & (0x1u << 31u)) != 0u;
42 const bool bsign = (bu & (0x1u << 31u)) != 0u;
43
44 const uint32_t avalue = (au & ((0x1u << 31u) - 1u));
45 const uint32_t bvalue = (bu & ((0x1u << 31u) - 1u));
46
47 if (asign != bsign)
48 return avalue + bvalue + 1u;
49 else if (avalue < bvalue)
50 return bvalue - avalue;
51 else
52 return avalue - bvalue;
53 }
54
calculateDiscreteFloatDistance(const tcu::Vec4 & ref,const tcu::Vec4 & res)55 const tcu::UVec4 calculateDiscreteFloatDistance(const tcu::Vec4 &ref, const tcu::Vec4 &res)
56 {
57 return tcu::UVec4(calculateDiscreteFloatDistance(ref[0], res[0]), calculateDiscreteFloatDistance(ref[1], res[1]),
58 calculateDiscreteFloatDistance(ref[2], res[2]), calculateDiscreteFloatDistance(ref[3], res[3]));
59 }
60
61 class SRGB8ConversionTest : public tcu::TestCase
62 {
63 public:
SRGB8ConversionTest(tcu::TestContext & context)64 SRGB8ConversionTest(tcu::TestContext &context) : tcu::TestCase(context, "srgb8", "SRGB8 conversion test")
65 {
66 }
67
iterate(void)68 IterateResult iterate(void)
69 {
70 bool isOk = true;
71 tcu::TestLog &log = m_testCtx.getLog();
72
73 for (int i = 0; i < 256; i++)
74 {
75 const tcu::UVec4 src(i);
76 const tcu::Vec4 res(tcu::sRGBA8ToLinear(src));
77 const tcu::Vec4 ref(tcu::sRGBToLinear(src.cast<float>() / tcu::Vec4(255.0f)));
78 const tcu::Vec4 diff(res - ref);
79 const tcu::UVec4 discreteFloatDiff(calculateDiscreteFloatDistance(ref, res));
80
81 if (tcu::anyNotEqual(res, ref))
82 log << tcu::TestLog::Message << i << ", Res: " << res << ", Ref: " << ref << ", Diff: " << diff
83 << ", Discrete float diff: " << discreteFloatDiff << tcu::TestLog::EndMessage;
84
85 if (tcu::boolAny(tcu::greaterThan(discreteFloatDiff, tcu::UVec4(1u))))
86 isOk = false;
87 }
88
89 if (isOk)
90 m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
91 else
92 m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, "Got ulp diffs greater than one.");
93
94 return STOP;
95 }
96 };
97
98 } // namespace
99
createSRGB8ConversionTest(tcu::TestContext & context)100 tcu::TestCase *createSRGB8ConversionTest(tcu::TestContext &context)
101 {
102 return new SRGB8ConversionTest(context);
103 }
104
105 } // namespace dit
106