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

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• Hash : 776c6015
  Author :
  Date : 2021-02-26T00:00:57
  

  Vulkan: Call glslang at compile time
  
  With this change, the ANGLE translator immediately compiles the
  generated GLSL into SPIR-V with glslang and discards the source.  This
  is in preparation for generating SPIR-V directly, by making the frontend
  and backend already able to digest it.
  
  This change also allows the expensive glslang calls to be parallelized,
  improving the following perf test by about 20%:
  
      LinkProgramBenchmark.Run/vulkan_compile_and_link_multi_thread
  
  Previously, the test was run as such in the Vulkan backend:
  
      Main           Thread 1          Thread 2
      Compile1 --->
      Compile2 --------------------->
                    Translator        Translator
               <---
               <---------------------
      Link
  
      glslang
       for
        shader1
  
      glslang
       for
        shader2
  
      Done
  
  With this change, it is run as such:
  
      Main           Thread 1          Thread 2
      Compile1 --->
      Compile2 --------------------->
                    Translator        Translator
                     glslang           glslang
               <---
               <---------------------
      Link
      Done
  
  glslang_wrapper_utils no longer interacts with glslang! A rename will
  follow.
  
  Bug: angleproject:4889
  Change-Id: If4303e8ba0ba43b1a2f47f8c0a9133d0bee1a19a
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2721195
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Tim Van Patten <timvp@google.com>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• src/compiler/translator/TranslatorVulkan.h

• //
  // Copyright 2016 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.
  //
  // TranslatorVulkan:
  //   A GLSL-based translator that outputs shaders that fit GL_KHR_vulkan_glsl and feeds them into
  //   glslang to spit out SPIR-V.
  //   See: https://www.khronos.org/registry/vulkan/specs/misc/GL_KHR_vulkan_glsl.txt
  //
  
  #ifndef COMPILER_TRANSLATOR_TRANSLATORVULKAN_H_
  #define COMPILER_TRANSLATOR_TRANSLATORVULKAN_H_
  
  #include "compiler/translator/Compiler.h"
  
  namespace sh
  {
  
  class TOutputVulkanGLSL;
  class SpecConst;
  class DriverUniform;
  
  class TranslatorVulkan : public TCompiler
  {
    public:
      TranslatorVulkan(sh::GLenum type, ShShaderSpec spec);
  
    protected:
      ANGLE_NO_DISCARD bool translate(TIntermBlock *root,
                                      ShCompileOptions compileOptions,
                                      PerformanceDiagnostics *perfDiagnostics) override;
      bool shouldFlattenPragmaStdglInvariantAll() override;
  
      // Subclass can call this method to transform the AST before writing the final output.
      // See TranslatorMetal.cpp.
      ANGLE_NO_DISCARD bool translateImpl(TInfoSinkBase &sink,
                                          TIntermBlock *root,
                                          ShCompileOptions compileOptions,
                                          PerformanceDiagnostics *perfDiagnostics,
                                          SpecConst *specConst,
                                          DriverUniform *driverUniforms,
                                          TOutputVulkanGLSL *outputGLSL);
  
      // Give subclass such as TranslatorMetal a chance to do depth transform before
      // TranslatorVulkan apply its own transform.
      ANGLE_NO_DISCARD virtual bool transformDepthBeforeCorrection(
          TIntermBlock *root,
          const DriverUniform *driverUniforms)
      {
          return true;
      }
  
      // Generate SPIR-V out of intermediate GLSL through glslang.
      ANGLE_NO_DISCARD bool compileToSpirv(const TInfoSinkBase &glsl);
  };
  
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_TRANSLATORVULKAN_H_
  

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