kc3-lang/angle/src/compiler/translator/glslang_wrapper.h

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• Hash : f3d5dac3
  Author :
  Date : 2021-08-23T17:25:15
  

  Vulkan: SPIR-V Gen: Drop dependency to glslang
  
  The SPIR-V gen path is now made default.  Compilation through glslang is
  still supported for debugging, and is enabled on the GLSL* end2end tests
  for smoke testing.  On release builds, glslang is not supported.
  
  To test with glslang, add the following gn arg (only necessary if dcheck
  is disabled):
  
      angle_enable_spirv_gen_through_glslang = true
  
  Then enable the generateSPIRVThroughGlslang feature.  This can be done
  by setting an environment variable:
  
      ANGLE_FEATURE_OVERRIDES_ENABLED=generateSPIRVThroughGlslang ./angle_deqp_gles2_tests
  
  Binary size saving:
  
  - 1.3MB on Linux (SPIR-V gen itself: 240KB)
  - 730KB on Android (SPIR-V gen itself: 140KB)
  
  Perf tests:
  
  - LinkProgramBenchmark.Run/vulkan_compile_single_thread
    * Through glslang:
        truncated mean: 1287033.36
    * Direct SPIR-V Gen:
        truncated mean: 244495.91  (~80% reduction)
  
  - LinkProgramBenchmark.Run/vulkan_compile_multi_thread
    * Through glslang:
        truncated mean: 4565894.83
    * Direct SPIR-V Gen:
        truncated mean: 1158164.10  (~75% reduction)
  
  Bug: angleproject:4889
  Bug: angleproject:6210
  Change-Id: I486342702977c8114e90073b97183aba115a8b2d
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3115140
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Tim Van Patten <timvp@google.com>
  

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• src/compiler/translator/glslang_wrapper.h

• //
  // 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.
  //
  // glslang_wrapper:
  //   A wrapper to compile GLSL strings to SPIR-V blobs.  glslang here refers to the Khronos
  //   compiler.
  //
  
  #ifndef COMPILER_TRANSLATOR_GLSLANG_WRAPPER_H_
  #define COMPILER_TRANSLATOR_GLSLANG_WRAPPER_H_
  
  #include "GLSLANG/ShaderLang.h"
  #include "common/PackedEnums.h"
  #include "common/spirv/spirv_types.h"
  
  #include <string>
  #include <vector>
  
  namespace sh
  {
  #if defined(ANGLE_ENABLE_SPIRV_GENERATION_THROUGH_GLSLANG)
  void GlslangInitialize();
  void GlslangFinalize();
  
  // Generate SPIR-V out of intermediate GLSL through glslang.
  ANGLE_NO_DISCARD bool GlslangCompileToSpirv(const ShBuiltInResources &resources,
                                              sh::GLenum shaderType,
                                              const std::string &shaderSource,
                                              angle::spirv::Blob *spirvBlobOut);
  #else
  ANGLE_INLINE void GlslangInitialize() {}
  ANGLE_INLINE void GlslangFinalize() {}
  ANGLE_INLINE bool GlslangCompileToSpirv(const ShBuiltInResources &resources,
                                          sh::GLenum shaderType,
                                          const std::string &shaderSource,
                                          angle::spirv::Blob *spirvBlobOut)
  {
      UNREACHABLE();
      return false;
  }
  #endif  // defined(ANGLE_ENABLE_VULKAN) || defined(ANGLE_ENABLE_METAL)
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_GLSLANG_WRAPPER_H_
  

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