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

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• Hash : 7ef9ecf0
  Author :
  Date : 2021-10-15T14:38:03
  

  Add GL_ANGLE_robust_fragment_shader_output.
  
  This extension codifies expected behaviour on Android, where some
  applications don't declare shader outputs that are active with the
  Framebuffer.
  
  Bug: angleproject:6566
  Change-Id: I3538a0aca25b6567e4b11e40d4611f1b240579c7
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3226724
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Cody Northrop <cnorthrop@google.com>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Tim Van Patten <timvp@google.com>
  

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• src/tests/gl_tests/RobustFragmentShaderOutputTest.cpp

• //
  // Copyright 2021 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.
  //
  // RobustFragmentShaderOutputTest: Tests for the custom ANGLE extension.
  
  #include "test_utils/ANGLETest.h"
  #include "test_utils/gl_raii.h"
  
  #include "util/random_utils.h"
  
  #include <stdint.h>
  
  using namespace angle;
  
  namespace
  {
  bool ExtEnabled()
  {
      return IsGLExtensionEnabled("GL_ANGLE_robust_fragment_shader_output");
  }
  }  // namespace
  
  class RobustFragmentShaderOutputTest : public ANGLETest
  {
    public:
      RobustFragmentShaderOutputTest() {}
  };
  
  // Basic behaviour from the extension.
  TEST_P(RobustFragmentShaderOutputTest, Basic)
  {
      ANGLE_SKIP_TEST_IF(!ExtEnabled());
  
      const char kFS[] = R"(#version 300 es
  precision mediump float;
  out vec4 outvar;
  void main() {
      outvar = vec4(0.0, 1.0, 0.0, 1.0);
  })";
      ANGLE_GL_PROGRAM(testProgram, essl3_shaders::vs::Simple(), kFS);
  
      GLFramebuffer framebuffer;
      glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
  
      constexpr GLsizei kSize = 2;
      std::vector<GLColor> bluePixels(kSize * kSize, GLColor::blue);
  
      GLTexture texA;
      glBindTexture(GL_TEXTURE_2D, texA);
      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                   bluePixels.data());
      glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texA, 0);
  
      GLTexture texB;
      glBindTexture(GL_TEXTURE_2D, texB);
      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kSize, kSize, 0, GL_RGBA, GL_UNSIGNED_BYTE,
                   bluePixels.data());
      glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D, texB, 0);
  
      ASSERT_GL_FRAMEBUFFER_COMPLETE(GL_FRAMEBUFFER);
  
      // Verify initial attachment colors (blue).
      glReadBuffer(GL_COLOR_ATTACHMENT0);
      EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::blue);
  
      glReadBuffer(GL_COLOR_ATTACHMENT1);
      EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::blue);
  
      constexpr std::array<GLenum, 2> kDrawBuffers = {GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1};
      glDrawBuffers(2, kDrawBuffers.data());
      glViewport(0, 0, kSize, kSize);
      glUseProgram(testProgram);
      ASSERT_GL_NO_ERROR();
  
      // Draw, verify first attachment is updated (green) and second is unchanged (blue).
      drawQuad(testProgram, essl3_shaders::PositionAttrib(), 0.5f, 1.0f, true);
      ASSERT_GL_NO_ERROR();
  
      glReadBuffer(GL_COLOR_ATTACHMENT0);
      EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::green);
  
      glReadBuffer(GL_COLOR_ATTACHMENT1);
      EXPECT_PIXEL_COLOR_EQ(0, 0, GLColor::blue);
  }
  
  ANGLE_INSTANTIATE_TEST_ES3(RobustFragmentShaderOutputTest);
  

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