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

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• Hash : 1a5c7a16
  Author :
  Date : 2020-02-25T12:02:31
  

  Reland "Vulkan:Include precision qualifier in GLSL"
  
  Currently still ignoring precision qualifiers for Vulkan shaders by
  default, but have added feature "enablePrecisionQualifiers" that can be
  enabled in order to include precision qualifiers.
  
  With this initial implementation, it's possible to get precision
  qualifier mis-matches in the generated GLSL 4.50. According to the
  spec this is allowed. From GLSLangSpec 4.50 section 4.7 "Precision and
  Precision Qualifiers":
  
  For the purposes of determining if an output from one shader stage
  matches an input of the next stage, the precision qualifier need not
  match.
  
  However, when converted to SPIR-V and run through the shader validation
  any mismatches will cause shader validation errors. Initially just
  ignoring those errors with this commit.
  
  Bug: angleproject:3078
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2057749
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Tobin Ehlis <tobine@google.com>
  Reviewed-by: Tim Van Patten <timvp@google.com>
  Commit-Queue: Tobin Ehlis <tobine@google.com>
  Change-Id: Ieecca604bb2c834c9b1c2bcab85279d1f8755dfa
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2086280
  

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• src/compiler/translator/OutputVulkanGLSL.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.
  //
  // OutputVulkanGLSL:
  //   Code that outputs shaders that fit GL_KHR_vulkan_glsl.
  //   The shaders are then fed into glslang to spit out SPIR-V (libANGLE-side).
  //   See: https://www.khronos.org/registry/vulkan/specs/misc/GL_KHR_vulkan_glsl.txt
  //
  
  #include "compiler/translator/OutputGLSL.h"
  
  namespace sh
  {
  
  class TOutputVulkanGLSL : public TOutputGLSL
  {
    public:
      TOutputVulkanGLSL(TInfoSinkBase &objSink,
                        ShArrayIndexClampingStrategy clampingStrategy,
                        ShHashFunction64 hashFunction,
                        NameMap &nameMap,
                        TSymbolTable *symbolTable,
                        sh::GLenum shaderType,
                        int shaderVersion,
                        ShShaderOutput output,
                        bool forceHighp,
                        bool enablePrecision,
                        ShCompileOptions compileOptions);
  
      void writeStructType(const TStructure *structure);
  
      uint32_t nextUnusedBinding() { return mNextUnusedBinding++; }
      uint32_t nextUnusedInputLocation(uint32_t consumedCount)
      {
          uint32_t nextUnused = mNextUnusedInputLocation;
          mNextUnusedInputLocation += consumedCount;
          return nextUnused;
      }
      uint32_t nextUnusedOutputLocation(uint32_t consumedCount)
      {
          uint32_t nextUnused = mNextUnusedOutputLocation;
          mNextUnusedOutputLocation += consumedCount;
          return nextUnused;
      }
  
    protected:
      void writeLayoutQualifier(TIntermTyped *variable) override;
      void writeVariableType(const TType &type,
                             const TSymbol *symbol,
                             bool isFunctionArgument) override;
      bool writeVariablePrecision(TPrecision) override;
  
      // Every resource that requires set & binding layout qualifiers is assigned set 0 and an
      // arbitrary binding when outputting GLSL.  Every input/output that requires a location
      // layout qualifiers is assigned an arbitrary location as well.
      //
      // Glslang wrapper modifies set, binding and location decorations in SPIR-V directly.
      uint32_t mNextUnusedBinding;
      uint32_t mNextUnusedInputLocation;
      uint32_t mNextUnusedOutputLocation;
  
    private:
      bool mForceHighp;
      bool mEnablePrecision;
  };
  
  }  // namespace sh
  

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