/*-------------------------------------------------------------------------
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* drawElements Internal Test Module
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* ---------------------------------
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*
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* Copyright 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*//*!
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* \file
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* \brief 8-bit sRGB conversion test.
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*//*--------------------------------------------------------------------*/
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#include "ditSRGB8ConversionTest.hpp"
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#include "tcuFloat.hpp"
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#include "tcuTestLog.hpp"
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#include "tcuTextureUtil.hpp"
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#include "tcuVectorUtil.hpp"
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namespace dit
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{
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namespace
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{
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deUint32 calculateDiscreteFloatDistance (float a, float b)
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{
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const deUint32 au = tcu::Float32(a).bits();
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const deUint32 bu = tcu::Float32(b).bits();
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const bool asign = (au & (0x1u << 31u)) != 0u;
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const bool bsign = (bu & (0x1u << 31u)) != 0u;
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const deUint32 avalue = (au & ((0x1u << 31u) - 1u));
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const deUint32 bvalue = (bu & ((0x1u << 31u) - 1u));
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if (asign != bsign)
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return avalue + bvalue + 1u;
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else if (avalue < bvalue)
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return bvalue - avalue;
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else
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return avalue - bvalue;
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}
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const tcu::UVec4 calculateDiscreteFloatDistance (const tcu::Vec4& ref, const tcu::Vec4& res)
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{
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return tcu::UVec4(calculateDiscreteFloatDistance(ref[0], res[0]), calculateDiscreteFloatDistance(ref[1], res[1]), calculateDiscreteFloatDistance(ref[2], res[2]), calculateDiscreteFloatDistance(ref[3], res[3]));
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}
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class SRGB8ConversionTest : public tcu::TestCase
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{
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public:
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SRGB8ConversionTest (tcu::TestContext& context)
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: tcu::TestCase (context, "srgb8", "SRGB8 conversion test")
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{
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}
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IterateResult iterate (void)
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{
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bool isOk = true;
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tcu::TestLog& log = m_testCtx.getLog();
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for (int i = 0; i < 256; i++)
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{
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const tcu::UVec4 src (i);
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const tcu::Vec4 res (tcu::sRGBA8ToLinear(src));
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const tcu::Vec4 ref (tcu::sRGBToLinear(src.cast<float>() / tcu::Vec4(255.0f)));
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const tcu::Vec4 diff (res - ref);
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const tcu::UVec4 discreteFloatDiff (calculateDiscreteFloatDistance(ref, res));
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if (tcu::anyNotEqual(res, ref))
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log << tcu::TestLog::Message << i << ", Res: " << res << ", Ref: " << ref << ", Diff: " << diff << ", Discrete float diff: " << discreteFloatDiff << tcu::TestLog::EndMessage;
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if (tcu::boolAny(tcu::greaterThan(discreteFloatDiff, tcu::UVec4(1u))))
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isOk = false;
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}
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if (isOk)
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m_testCtx.setTestResult(QP_TEST_RESULT_PASS, "Pass");
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else
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m_testCtx.setTestResult(QP_TEST_RESULT_FAIL, "Got ulp diffs greater than one.");
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return STOP;
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}
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};
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} // anonymous
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tcu::TestCase* createSRGB8ConversionTest (tcu::TestContext& context)
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{
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return new SRGB8ConversionTest(context);
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}
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} // dit
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