kc3-lang/angle/src/tests/gl_tests/PackUnpackTest.cpp

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• Hash : 91d56945
  Author :
  Date : 2015-07-21T18:56:48
  

  Emulate the pack/unpack functions for unorms.
  
  BUG=angleproject:1044
  
  Change-Id: I2cfb792de43d3a6fddd750100c74f948948dc1f6
  Reviewed-on: https://chromium-review.googlesource.com/287290
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Commit-Queue: Geoff Lang <geofflang@chromium.org>
  

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• src/tests/gl_tests/PackUnpackTest.cpp

• //
  // Copyright 2015 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // PackUnpackTest:
  //   Tests the corrrectness of opengl 4.1 emulation of pack/unpack built-in functions.
  //
  
  #include "test_utils/ANGLETest.h"
  
  using namespace angle;
  
  namespace
  {
  
  class PackUnpackTest : public ANGLETest
  {
    protected:
      PackUnpackTest()
      {
          setWindowWidth(16);
          setWindowHeight(16);
          setConfigRedBits(8);
          setConfigGreenBits(8);
          setConfigBlueBits(8);
          setConfigAlphaBits(8);
      }
  
      void SetUp() override
      {
          ANGLETest::SetUp();
  
          // Vertex Shader source
          const std::string vs = SHADER_SOURCE
          (   #version 300 es\n
              precision mediump float;
              in vec4 position;
  
              void main()
              {
                  gl_Position = position;
              }
          );
  
          // clang-format off
          // Fragment Shader source
          const std::string sNormFS = SHADER_SOURCE
          (   #version 300 es\n
              precision mediump float;
              uniform mediump vec2 v;
              layout(location = 0) out mediump vec4 fragColor;
  
              void main()
              {
                  uint u = packSnorm2x16(v);
                  vec2 r = unpackSnorm2x16(u);
                  fragColor = vec4(r, 0.0, 1.0);
              }
          );
  
          // Fragment Shader source
          const std::string uNormFS = SHADER_SOURCE
          (   #version 300 es\n
              precision mediump float;
              uniform mediump vec2 v;
              layout(location = 0) out mediump vec4 fragColor;
  
              void main()
              {
                  uint u = packUnorm2x16(v);
                  vec2 r = unpackUnorm2x16(u);
                  fragColor = vec4(r, 0.0, 1.0);
              }
          );
  
          // Fragment Shader source
          const std::string halfFS = SHADER_SOURCE
          (   #version 300 es\n
              precision mediump float;
              uniform mediump vec2 v;
              layout(location = 0) out mediump vec4 fragColor;
  
               void main()
               {
                   uint u = packHalf2x16(v);
                   vec2 r = unpackHalf2x16(u);
                   fragColor = vec4(r, 0.0, 1.0);
               }
          );
          // clang-format on
  
          mSNormProgram = CompileProgram(vs, sNormFS);
          mUNormProgram = CompileProgram(vs, uNormFS);
          mHalfProgram = CompileProgram(vs, halfFS);
          if (mSNormProgram == 0 || mUNormProgram == 0 || mHalfProgram == 0)
          {
              FAIL() << "shader compilation failed.";
          }
  
          glGenTextures(1, &mOffscreenTexture2D);
          glBindTexture(GL_TEXTURE_2D, mOffscreenTexture2D);
          glTexStorage2D(GL_TEXTURE_2D, 1, GL_RG32F, getWindowWidth(), getWindowHeight());
  
          glGenFramebuffers(1, &mOffscreenFramebuffer);
          glBindFramebuffer(GL_FRAMEBUFFER, mOffscreenFramebuffer);
          glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mOffscreenTexture2D, 0);
  
          glViewport(0, 0, 16, 16);
  
          const GLfloat color[] = { 1.0f, 1.0f, 0.0f, 1.0f };
          glClearBufferfv(GL_COLOR, 0, color);
      }
  
      void TearDown() override
      {
          glDeleteTextures(1, &mOffscreenTexture2D);
          glDeleteFramebuffers(1, &mOffscreenFramebuffer);
          glDeleteProgram(mSNormProgram);
          glDeleteProgram(mUNormProgram);
          glDeleteProgram(mHalfProgram);
  
          ANGLETest::TearDown();
      }
  
      void compareBeforeAfter(GLuint program, float input1, float input2)
      {
          compareBeforeAfter(program, input1, input2, input1, input2);
      }
  
      void compareBeforeAfter(GLuint program, float input1, float input2, float expect1, float expect2)
      {
          GLint vec2Location = glGetUniformLocation(program, "v");
  
          glUseProgram(program);
          glUniform2f(vec2Location, input1, input2);
  
          drawQuad(program, "position", 0.5f);
  
          ASSERT_GL_NO_ERROR();
  
          GLfloat p[2] = { 0 };
          glReadPixels(8, 8, 1, 1, GL_RG, GL_FLOAT, p);
  
          ASSERT_GL_NO_ERROR();
  
          static const double epsilon = 0.0005;
          EXPECT_NEAR(p[0], expect1, epsilon);
          EXPECT_NEAR(p[1], expect2, epsilon);
      }
  
      GLuint mSNormProgram;
      GLuint mUNormProgram;
      GLuint mHalfProgram;
      GLuint mOffscreenFramebuffer;
      GLuint mOffscreenTexture2D;
  };
  
  // Test the correctness of packSnorm2x16 and unpackSnorm2x16 functions calculating normal floating numbers.
  TEST_P(PackUnpackTest, PackUnpackSnormNormal)
  {
      // Expect the shader to output the same value as the input
      compareBeforeAfter(mSNormProgram, 0.5f, -0.2f);
      compareBeforeAfter(mSNormProgram, -0.35f, 0.75f);
      compareBeforeAfter(mSNormProgram, 0.00392f, -0.99215f);
      compareBeforeAfter(mSNormProgram, 1.0f, -0.00392f);
  }
  
  // Test the correctness of packSnorm2x16 and unpackSnorm2x16 functions calculating normal floating
  // numbers.
  TEST_P(PackUnpackTest, PackUnpackUnormNormal)
  {
      // Expect the shader to output the same value as the input
      compareBeforeAfter(mUNormProgram, 0.5f, 0.2f, 0.5f, 0.2f);
      compareBeforeAfter(mUNormProgram, 0.35f, 0.75f, 0.35f, 0.75f);
      compareBeforeAfter(mUNormProgram, 0.00392f, 0.99215f, 0.00392f, 0.99215f);
      compareBeforeAfter(mUNormProgram, 1.0f, 0.00392f, 1.0f, 0.00392f);
  }
  
  // Test the correctness of packHalf2x16 and unpackHalf2x16 functions calculating normal floating numbers.
  TEST_P(PackUnpackTest, PackUnpackHalfNormal)
  {
      // TODO(cwallez) figure out why it is broken on Intel on Mac
  #if defined(ANGLE_PLATFORM_APPLE)
      if (IsIntel() && getPlatformRenderer() == EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE)
      {
          std::cout << "Test skipped on Intel on Mac." << std::endl;
          return;
      }
  #endif
  
      // Expect the shader to output the same value as the input
      compareBeforeAfter(mHalfProgram, 0.5f, -0.2f);
      compareBeforeAfter(mHalfProgram, -0.35f, 0.75f);
      compareBeforeAfter(mHalfProgram, 0.00392f, -0.99215f);
      compareBeforeAfter(mHalfProgram, 1.0f, -0.00392f);
  }
  
  // Test the correctness of packSnorm2x16 and unpackSnorm2x16 functions calculating subnormal floating numbers.
  TEST_P(PackUnpackTest, PackUnpackSnormSubnormal)
  {
      // Expect the shader to output the same value as the input
      compareBeforeAfter(mSNormProgram, 0.00001f, -0.00001f);
  }
  
  // Test the correctness of packUnorm2x16 and unpackUnorm2x16 functions calculating subnormal
  // floating numbers.
  TEST_P(PackUnpackTest, PackUnpackUnormSubnormal)
  {
      // Expect the shader to output the same value as the input for positive numbers and clamp
      // to [0, 1]
      compareBeforeAfter(mUNormProgram, 0.00001f, -0.00001f, 0.00001f, 0.0f);
  }
  
  // Test the correctness of packHalf2x16 and unpackHalf2x16 functions calculating subnormal floating numbers.
  TEST_P(PackUnpackTest, PackUnpackHalfSubnormal)
  {
      // Expect the shader to output the same value as the input
      compareBeforeAfter(mHalfProgram, 0.00001f, -0.00001f);
  }
  
  // Test the correctness of packSnorm2x16 and unpackSnorm2x16 functions calculating zero floating numbers.
  TEST_P(PackUnpackTest, PackUnpackSnormZero)
  {
      // Expect the shader to output the same value as the input
      compareBeforeAfter(mSNormProgram, 0.00000f, -0.00000f);
  }
  
  // Test the correctness of packUnorm2x16 and unpackUnorm2x16 functions calculating zero floating
  // numbers.
  TEST_P(PackUnpackTest, PackUnpackUnormZero)
  {
      compareBeforeAfter(mUNormProgram, 0.00000f, -0.00000f, 0.00000f, 0.00000f);
  }
  
  // Test the correctness of packHalf2x16 and unpackHalf2x16 functions calculating zero floating numbers.
  TEST_P(PackUnpackTest, PackUnpackHalfZero)
  {
      // Expect the shader to output the same value as the input
      compareBeforeAfter(mHalfProgram, 0.00000f, -0.00000f);
  }
  
  // Test the correctness of packUnorm2x16 and unpackUnorm2x16 functions calculating overflow floating
  // numbers.
  TEST_P(PackUnpackTest, PackUnpackUnormOverflow)
  {
      // Expect the shader to clamp the input to [0, 1]
      compareBeforeAfter(mUNormProgram, 67000.0f, -67000.0f, 1.0f, 0.0f);
  }
  
  // Test the correctness of packSnorm2x16 and unpackSnorm2x16 functions calculating overflow floating numbers.
  TEST_P(PackUnpackTest, PackUnpackSnormOverflow)
  {
      // Expect the shader to clamp the input to [-1, 1]
      compareBeforeAfter(mSNormProgram, 67000.0f, -67000.0f, 1.0f, -1.0f);
  }
  
  // Use this to select which configurations (e.g. which renderer, which GLES major version) these tests should be run against.
  ANGLE_INSTANTIATE_TEST(PackUnpackTest,
                         ES3_OPENGL(3, 3),
                         ES3_OPENGL(4, 0),
                         ES3_OPENGL(4, 1),
                         ES3_OPENGL(4, 2),
                         ES3_OPENGL(4, 3),
                         ES3_OPENGL(4, 4),
                         ES3_OPENGL(4, 5),
                         ES3_OPENGLES());
  }
  

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