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[platform/upstream/VK-GL-CTS.git] / modules / internal / ditSRGB8ConversionTest.cpp
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
36 deUint32 calculateDiscreteFloatDistance (float a, float b)
37 {
38         const deUint32          au              = tcu::Float32(a).bits();
39         const deUint32          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 deUint32          avalue  = (au & ((0x1u << 31u) - 1u));
45         const deUint32          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
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]), calculateDiscreteFloatDistance(ref[2], res[2]), calculateDiscreteFloatDistance(ref[3], res[3]));
58 }
59
60 class SRGB8ConversionTest : public tcu::TestCase
61 {
62 public:
63         SRGB8ConversionTest (tcu::TestContext& context)
64                 : tcu::TestCase (context, "srgb8", "SRGB8 conversion test")
65         {
66         }
67
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 << ", Discrete float diff: " << discreteFloatDiff << tcu::TestLog::EndMessage;
83
84                         if (tcu::boolAny(tcu::greaterThan(discreteFloatDiff, tcu::UVec4(1u))))
85                                 isOk = false;
86                 }
87
88                 if (isOk)
89                         m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
90                 else
91                         m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, "Got ulp diffs greater than one.");
92
93                 return STOP;
94         }
95 };
96
97 } // anonymous
98
99 tcu::TestCase* createSRGB8ConversionTest (tcu::TestContext& context)
100 {
101         return new SRGB8ConversionTest(context);
102 }
103
104 } // dit