kc3-lang/angle/src/tests/compiler_tests/APPLE_clip_distance_test.cpp

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• Hash : dadd1986
  Author :
  Date : 2020-04-21T01:50:00
  

  Implement GL_APPLE_clip_distance
  
  - Built-in variable gl_ClipDistance has been added to compiler.
  - Desktop GL: gl_ClipDistance is supported since GL 3.0. Enable/Disable
  each gl_ClipDistances[i] works out of the box via glEnable().
  - Vulkan/Metal: Use uniform variable to control writing to each
  gl_ClipDistance. One bit flag controls one element in the gl_ClipDistance
  array. The writing to the disabled element in vertex shader will be
  ignored, and turned into zero assignment instead.
  - Direct3D/Mobile GL: Not implemented yet.
  - Added ClipDistanceTest to gl_tests and compiler unittests.
  - GL_APPLE_clip_distance is a subset of GL_EXT_clip_cull_distance, so
  GL_EXT_clip_cull_distance could be implemented in future if needed.
  
  Bug: angleproject:4452
  Change-Id: I571ac8b56826989808a680226a04bec4cf59988e
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2084324
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• src/tests/compiler_tests/APPLE_clip_distance_test.cpp

• //
  // Copyright 2020 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.
  //
  // APPLE_clip_distance_test.cpp:
  //   Test for APPLE_clip_distance
  //
  
  #include "tests/test_utils/ShaderExtensionTest.h"
  
  namespace
  {
  const char EXTPragma[] = "#extension GL_APPLE_clip_distance : require\n";
  
  // Shader using gl_ClipDistance
  const char ESSL100_APPLEClipDistanceShader1[] =
      R"(
      uniform vec4 uPlane;
  
      attribute vec4 aPosition;
  
      void main()
      {
          gl_Position = aPosition;
          gl_ClipDistance[1] = dot(aPosition, uPlane);
      })";
  
  // Shader redeclares gl_ClipDistance
  const char ESSL100_APPLEClipDistanceShader2[] =
      R"(
      uniform vec4 uPlane;
  
      attribute vec4 aPosition;
  
      varying highp float gl_ClipDistance[4];
  
      void main()
      {
          gl_Position = aPosition;
          gl_ClipDistance[gl_MaxClipDistances - 6 + 1] = dot(aPosition, uPlane);
          gl_ClipDistance[gl_MaxClipDistances - int(aPosition.x)] = dot(aPosition, uPlane);
      })";
  
  class APPLEClipDistanceTest : public sh::ShaderExtensionTest
  {
    public:
      void InitializeCompiler() { InitializeCompiler(SH_GLSL_130_OUTPUT); }
      void InitializeCompiler(ShShaderOutput shaderOutputType)
      {
          DestroyCompiler();
  
          mCompiler = sh::ConstructCompiler(GL_VERTEX_SHADER, testing::get<0>(GetParam()),
                                            shaderOutputType, &mResources);
          ASSERT_TRUE(mCompiler != nullptr) << "Compiler could not be constructed.";
      }
  
      testing::AssertionResult TestShaderCompile(const char *pragma)
      {
          const char *shaderStrings[] = {testing::get<1>(GetParam()), pragma,
                                         testing::get<2>(GetParam())};
          bool success = sh::Compile(mCompiler, shaderStrings, 3, SH_VARIABLES | SH_OBJECT_CODE);
          if (success)
          {
              return ::testing::AssertionSuccess() << "Compilation success";
          }
          return ::testing::AssertionFailure() << sh::GetInfoLog(mCompiler);
      }
  };
  
  // Extension flag is required to compile properly. Expect failure when it is
  // not present.
  TEST_P(APPLEClipDistanceTest, CompileFailsWithoutExtension)
  {
      mResources.APPLE_clip_distance = 0;
      InitializeCompiler();
      EXPECT_FALSE(TestShaderCompile(EXTPragma));
  }
  
  // Extension directive is required to compile properly. Expect failure when
  // it is not present.
  TEST_P(APPLEClipDistanceTest, CompileFailsWithExtensionWithoutPragma)
  {
      mResources.APPLE_clip_distance = 1;
      InitializeCompiler();
      EXPECT_FALSE(TestShaderCompile(""));
  }
  
  // With extension flag and extension directive, compiling succeeds.
  // Also test that the extension directive state is reset correctly.
  TEST_P(APPLEClipDistanceTest, CompileSucceedsWithExtensionAndPragma)
  {
      mResources.APPLE_clip_distance = 1;
      mResources.MaxClipDistances    = 8;
      InitializeCompiler();
      EXPECT_TRUE(TestShaderCompile(EXTPragma));
      // Test reset functionality.
      EXPECT_FALSE(TestShaderCompile(""));
      EXPECT_TRUE(TestShaderCompile(EXTPragma));
  }
  
  #if defined(ANGLE_ENABLE_VULKAN)
  // With extension flag and extension directive, compiling using TranslatorVulkan succeeds.
  TEST_P(APPLEClipDistanceTest, CompileSucceedsVulkan)
  {
      mResources.APPLE_clip_distance = 1;
      mResources.MaxClipDistances    = 8;
  
      InitializeCompiler(SH_GLSL_VULKAN_OUTPUT);
      EXPECT_TRUE(TestShaderCompile(EXTPragma));
  }
  #endif
  
  #if defined(ANGLE_ENABLE_METAL)
  // With extension flag and extension directive, compiling using TranslatorMetal succeeds.
  TEST_P(APPLEClipDistanceTest, CompileSucceedsMetal)
  {
      mResources.APPLE_clip_distance = 1;
      mResources.MaxClipDistances    = 8;
  
      InitializeCompiler(SH_GLSL_METAL_OUTPUT);
      EXPECT_TRUE(TestShaderCompile(EXTPragma));
  }
  #endif
  
  // The SL #version 100 shaders that are correct work similarly
  // in both GL2 and GL3, with and without the version string.
  INSTANTIATE_TEST_SUITE_P(CorrectESSL100Shaders,
                           APPLEClipDistanceTest,
                           Combine(Values(SH_GLES2_SPEC),
                                   Values(sh::ESSLVersion100),
                                   Values(ESSL100_APPLEClipDistanceShader1,
                                          ESSL100_APPLEClipDistanceShader2)));
  
  }  // anonymous namespace
  

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