kc3-lang/angle/src/libANGLE/Uniform.h

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• Hash : 8b79410b
  Author :
  Date : 2023-04-02T22:25:12
  

  Vulkan: Treat readonly SSBOs as readonly!
  
  Instead of assuming SSBOs are always written to, this change adds
  plumbing for the backend to know when an SSBO is declared readonly and
  marks the buffer readonly accordingly.
  
  With this change, BufferVk can optimize uploads and copies to and from
  the buffer with the knowledge that it can be safely mapped on the CPU
  for read while it's being used by the GPU.
  
  Bug: b/276002151
  Change-Id: I75342148c07949a83436054a738395bbd88caec5
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4392720
  Reviewed-by: Charlie Lao <cclao@google.com>
  Reviewed-by: Yuxin Hu <yuxinhu@google.com>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• src/libANGLE/Uniform.h

• //
  // Copyright 2010 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.
  //
  
  #ifndef LIBANGLE_UNIFORM_H_
  #define LIBANGLE_UNIFORM_H_
  
  #include <string>
  #include <vector>
  
  #include "angle_gl.h"
  #include "common/MemoryBuffer.h"
  #include "common/debug.h"
  #include "common/utilities.h"
  #include "compiler/translator/blocklayout.h"
  #include "libANGLE/angletypes.h"
  
  namespace gl
  {
  struct UniformTypeInfo;
  
  struct ActiveVariable
  {
      ActiveVariable();
      ActiveVariable(const ActiveVariable &rhs);
      virtual ~ActiveVariable();
  
      ActiveVariable &operator=(const ActiveVariable &rhs);
  
      ShaderType getFirstShaderTypeWhereActive() const;
      void setActive(ShaderType shaderType, bool used);
      void unionReferencesWith(const ActiveVariable &other);
      bool isActive(ShaderType shaderType) const
      {
          ASSERT(shaderType != ShaderType::InvalidEnum);
          return mActiveUseBits[shaderType];
      }
      ShaderBitSet activeShaders() const { return mActiveUseBits; }
      GLuint activeShaderCount() const;
  
    private:
      ShaderBitSet mActiveUseBits;
  };
  
  // Helper struct representing a single shader uniform
  struct LinkedUniform : public sh::ShaderVariable, public ActiveVariable
  {
      LinkedUniform();
      LinkedUniform(GLenum type,
                    GLenum precision,
                    const std::string &name,
                    const std::vector<unsigned int> &arraySizes,
                    const int binding,
                    const int offset,
                    const int location,
                    const int bufferIndex,
                    const sh::BlockMemberInfo &blockInfo);
      LinkedUniform(const sh::ShaderVariable &uniform);
      LinkedUniform(const LinkedUniform &uniform);
      LinkedUniform &operator=(const LinkedUniform &uniform);
      ~LinkedUniform() override;
  
      bool isSampler() const { return typeInfo->isSampler; }
      bool isImage() const { return typeInfo->isImageType; }
      bool isAtomicCounter() const { return IsAtomicCounterType(type); }
      bool isInDefaultBlock() const { return bufferIndex == -1; }
      bool isField() const { return name.find('.') != std::string::npos; }
      size_t getElementSize() const { return typeInfo->externalSize; }
      size_t getElementComponents() const { return typeInfo->componentCount; }
  
      const UniformTypeInfo *typeInfo;
  
      // Identifies the containing buffer backed resource -- interface block or atomic counter buffer.
      int bufferIndex;
      sh::BlockMemberInfo blockInfo;
      std::vector<unsigned int> outerArraySizes;
      unsigned int outerArrayOffset;
  };
  
  struct BufferVariable : public sh::ShaderVariable, public ActiveVariable
  {
      BufferVariable();
      BufferVariable(GLenum type,
                     GLenum precision,
                     const std::string &name,
                     const std::vector<unsigned int> &arraySizes,
                     const int bufferIndex,
                     const sh::BlockMemberInfo &blockInfo);
      ~BufferVariable() override;
  
      int bufferIndex;
      sh::BlockMemberInfo blockInfo;
  
      int topLevelArraySize;
  };
  
  // Parent struct for atomic counter, uniform block, and shader storage block buffer, which all
  // contain a group of shader variables, and have a GL buffer backed.
  struct ShaderVariableBuffer : public ActiveVariable
  {
      ShaderVariableBuffer();
      ShaderVariableBuffer(const ShaderVariableBuffer &other);
      ~ShaderVariableBuffer() override;
      int numActiveVariables() const;
  
      int binding;
      unsigned int dataSize;
      std::vector<unsigned int> memberIndexes;
  };
  
  using AtomicCounterBuffer = ShaderVariableBuffer;
  
  // Helper struct representing a single shader interface block
  struct InterfaceBlock : public ShaderVariableBuffer
  {
      InterfaceBlock();
      InterfaceBlock(const std::string &nameIn,
                     const std::string &mappedNameIn,
                     bool isArrayIn,
                     bool isReadOnlyIn,
                     unsigned int arrayElementIn,
                     unsigned int firstFieldArraySizeIn,
                     int bindingIn);
      InterfaceBlock(const InterfaceBlock &other);
  
      std::string nameWithArrayIndex() const;
      std::string mappedNameWithArrayIndex() const;
  
      std::string name;
      std::string mappedName;
      bool isArray;
      // Only valid for SSBOs, specifies whether it has the readonly qualifier.
      bool isReadOnly;
      unsigned int arrayElement;
      unsigned int firstFieldArraySize;
  };
  
  }  // namespace gl
  
  #endif  // LIBANGLE_UNIFORM_H_
  

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