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

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• Hash : 03f3caec
  Author :
  Date : 2015-03-16T02:01:21
  

  Emulate Missing pack_unpack functions from OpenGL 4.1
  
  BUG=angleproject:947
  
  TEST=angle_unittests, angle_end2end_tests
  
  Change-Id: Id1afd7630d9720b6701225b7abf1ce4a3bf528b6
  Reviewed-on: https://chromium-review.googlesource.com/260232
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Olli Etuaho <oetuaho@nvidia.com>
  Tested-by: Olli Etuaho <oetuaho@nvidia.com>
  

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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;
              }
          );
  
          // 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);
                  if (r.x < 0.0) r.x = 1.0 + r.x;
                  if (r.y < 0.0) r.y = 1.0 + r.y;
                  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);
                   if (r.x < 0.0) r.x = 1.0 + r.x;
                   if (r.y < 0.0) r.y = 1.0 + r.y;
                   fragColor = vec4(r, 0.0, 1.0);
               }
          );
  
          mSNormProgram = CompileProgram(vs, sNormFS);
          mHalfProgram = CompileProgram(vs, halfFS);
          if (mSNormProgram == 0 || mHalfProgram == 0)
          {
              FAIL() << "shader compilation failed.";
          }
  
          glGenFramebuffers(1, &mOffscreenFramebuffer);
          glGenTextures(1, &mOffscreenTexture2D);
      }
  
      void TearDown() override
      {
          glDeleteTextures(1, &mOffscreenTexture2D);
          glDeleteFramebuffers(1, &mOffscreenFramebuffer);
          glDeleteProgram(mSNormProgram);
          glDeleteProgram(mHalfProgram);
  
          ANGLETest::TearDown();
      }
  
      double computeOutput(float input)
      {
          if (input <= -1.0)
              return 0;
          else if (input >= 1.0)
              return 255;
          else if (input < -6.10E-05 && input > -1.0)
              return 255 * (1.0 + input);
          else
              return 255 * input;
      }
  
      void compareBeforeAfter(GLuint program, float input1, float input2)
      {
          glBindTexture(GL_TEXTURE_2D, mOffscreenTexture2D);
          glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, getWindowWidth(), getWindowHeight(), 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
          glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
          glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  
          glBindFramebuffer(GL_FRAMEBUFFER, mOffscreenFramebuffer);
          glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mOffscreenTexture2D, 0);
          glBindFramebuffer(GL_FRAMEBUFFER, mOffscreenFramebuffer);
          glViewport(0, 0, 16, 16);
          const GLfloat color[] = { 1.0f, 1.0f, 0.0f, 1.0f };
          glClearBufferfv(GL_COLOR, 0, color);
  
          GLfloat vertexLocations[] =
          {
              -1.0f, 1.0f, 0.0f,
              -1.0f, -1.0f, 0.0f,
              1.0f, 1.0f, 0.0f,
              1.0f, -1.0f, 0.0f,
          };
  
          GLint positionLocation = glGetAttribLocation(program, "position");
          GLint vec2Location = glGetUniformLocation(program, "v");
          glUseProgram(program);
          glUniform2f(vec2Location, input1, input2);
          glVertexAttribPointer(positionLocation, 3, GL_FLOAT, GL_FALSE, 0, vertexLocations);
          glEnableVertexAttribArray(positionLocation);
          glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
          glUseProgram(0);
  
          ASSERT_GL_NO_ERROR();
          EXPECT_PIXEL_NEAR(8, 8, computeOutput(input1), computeOutput(input2), 0, 255, 1.0);
      }
  
      GLuint mSNormProgram;
      GLuint mHalfProgram;
      GLuint mOffscreenFramebuffer;
      GLuint mOffscreenTexture2D;
  };
  
  // Test the correctness of packSnorm2x16 and unpackSnorm2x16 functions calculating normal floating numbers.
  TEST_P(PackUnpackTest, PackUnpackSnormNormal)
  {
      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 packHalf2x16 and unpackHalf2x16 functions calculating normal floating numbers.
  TEST_P(PackUnpackTest, PackUnpackHalfNormal)
  {
      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)
  {
      compareBeforeAfter(mSNormProgram, 0.00001f, -0.00001f);
  }
  
  // Test the correctness of packHalf2x16 and unpackHalf2x16 functions calculating subnormal floating numbers.
  TEST_P(PackUnpackTest, PackUnpackHalfSubnormal)
  {
      compareBeforeAfter(mHalfProgram, 0.00001f, -0.00001f);
  }
  
  // Test the correctness of packSnorm2x16 and unpackSnorm2x16 functions calculating zero floating numbers.
  TEST_P(PackUnpackTest, PackUnpackSnormZero)
  {
      compareBeforeAfter(mSNormProgram, 0.00000f, -0.00000f);
  }
  
  // Test the correctness of packHalf2x16 and unpackHalf2x16 functions calculating zero floating numbers.
  TEST_P(PackUnpackTest, PackUnpackHalfZero)
  {
      compareBeforeAfter(mHalfProgram, 0.00000f, -0.00000f);
  }
  
  // Test the correctness of packSnorm2x16 and unpackSnorm2x16 functions calculating overflow floating numbers.
  TEST_P(PackUnpackTest, PackUnpackSnormOverflow)
  {
      compareBeforeAfter(mHalfProgram, 67000.0f, -67000.0f);
  }
  
  // Test the correctness of packHalf2x16 and unpackHalf2x16 functions calculating overflow floating numbers.
  TEST_P(PackUnpackTest, PackUnpackHalfOverflow)
  {
      compareBeforeAfter(mHalfProgram, 67000.0f, -67000.0f);
  }
  
  // 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());
  
  }

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