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

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• Hash : dde78e8c
  Author :
  Date : 2017-05-22T14:13:27
  

  ES31: Implement Vertex Attrib Binding on OpenGL
  
  This patch intends to implement Vertex Attrib Binding on OpenGL
  back-ends:
  
  1. Add supports for updating vertex attributes by Vertex Attrib
  Binding APIs.
  2. Refactor the process of updating vertex attribtues in class
  VertexArray to make it easier to implement this feature.
  
  BUG=angleproject:1593
  TEST=dEQP-GLES31.functional.vertex_attribute_binding.*
  
  Change-Id: I800e61518c552b94b84c415895ad31668b0a84b2
  Reviewed-on: https://chromium-review.googlesource.com/510251
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• src/libANGLE/VertexArray.h

• //
  // Copyright (c) 2013 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.
  //
  // This class contains prototypes for representing GLES 3 Vertex Array Objects:
  //
  //   The buffer objects that are to be used by the vertex stage of the GL are collected
  //   together to form a vertex array object. All state related to the definition of data used
  //   by the vertex processor is encapsulated in a vertex array object.
  //
  
  #ifndef LIBANGLE_VERTEXARRAY_H_
  #define LIBANGLE_VERTEXARRAY_H_
  
  #include "libANGLE/RefCountObject.h"
  #include "libANGLE/Constants.h"
  #include "libANGLE/Debug.h"
  #include "libANGLE/State.h"
  #include "libANGLE/VertexAttribute.h"
  
  #include <vector>
  
  namespace rx
  {
  class GLImplFactory;
  class VertexArrayImpl;
  }  // namespace rx
  
  namespace gl
  {
  class Buffer;
  
  class VertexArrayState final : angle::NonCopyable
  {
    public:
      VertexArrayState(size_t maxAttribs, size_t maxBindings);
      ~VertexArrayState();
  
      const std::string &getLabel() const { return mLabel; }
  
      const BindingPointer<Buffer> &getElementArrayBuffer() const { return mElementArrayBuffer; }
      size_t getMaxAttribs() const { return mVertexAttributes.size(); }
      size_t getMaxBindings() const { return mVertexBindings.size(); }
      size_t getMaxEnabledAttribute() const { return mMaxEnabledAttribute; }
      const std::vector<VertexAttribute> &getVertexAttributes() const { return mVertexAttributes; }
      const VertexAttribute &getVertexAttribute(size_t attribIndex) const
      {
          return mVertexAttributes[attribIndex];
      }
      const std::vector<VertexBinding> &getVertexBindings() const { return mVertexBindings; }
      const VertexBinding &getVertexBinding(size_t bindingIndex) const
      {
          return mVertexBindings[bindingIndex];
      }
      const VertexBinding &getBindingFromAttribIndex(size_t attribIndex) const
      {
          return mVertexBindings[mVertexAttributes[attribIndex].bindingIndex];
      }
      size_t getBindingIndexFromAttribIndex(size_t attribIndex) const
      {
          return mVertexAttributes[attribIndex].bindingIndex;
      }
  
    private:
      friend class VertexArray;
      std::string mLabel;
      std::vector<VertexAttribute> mVertexAttributes;
      BindingPointer<Buffer> mElementArrayBuffer;
      std::vector<VertexBinding> mVertexBindings;
      size_t mMaxEnabledAttribute;
  };
  
  class VertexArray final : public LabeledObject
  {
    public:
      VertexArray(rx::GLImplFactory *factory, GLuint id, size_t maxAttribs, size_t maxAttribBindings);
  
      void onDestroy(const Context *context);
  
      GLuint id() const;
  
      void setLabel(const std::string &label) override;
      const std::string &getLabel() const override;
  
      const VertexBinding &getVertexBinding(size_t bindingIndex) const;
      const VertexAttribute &getVertexAttribute(size_t attribIndex) const;
      const VertexBinding &getBindingFromAttribIndex(size_t attribIndex) const
      {
          return mState.getBindingFromAttribIndex(attribIndex);
      }
  
      void detachBuffer(const Context *context, GLuint bufferName);
      void setVertexAttribDivisor(const Context *context, size_t index, GLuint divisor);
      void enableAttribute(size_t attribIndex, bool enabledState);
      void setVertexAttribPointer(const Context *context,
                                  size_t attribIndex,
                                  Buffer *boundBuffer,
                                  GLint size,
                                  GLenum type,
                                  bool normalized,
                                  bool pureInteger,
                                  GLsizei stride,
                                  const void *pointer);
      void setVertexAttribFormat(size_t attribIndex,
                                 GLint size,
                                 GLenum type,
                                 bool normalized,
                                 bool pureInteger,
                                 GLuint relativeOffset);
      void bindVertexBuffer(const Context *context,
                            size_t bindingIndex,
                            Buffer *boundBuffer,
                            GLintptr offset,
                            GLsizei stride);
      void setVertexAttribBinding(const Context *context, size_t attribIndex, GLuint bindingIndex);
      void setVertexBindingDivisor(size_t bindingIndex, GLuint divisor);
      void setVertexAttribFormatImpl(size_t attribIndex,
                                     GLint size,
                                     GLenum type,
                                     bool normalized,
                                     bool pureInteger,
                                     GLuint relativeOffset);
      void bindVertexBufferImpl(const Context *context,
                                size_t bindingIndex,
                                Buffer *boundBuffer,
                                GLintptr offset,
                                GLsizei stride);
  
      void setElementArrayBuffer(const Context *context, Buffer *buffer);
  
      const BindingPointer<Buffer> &getElementArrayBuffer() const
      {
          return mState.getElementArrayBuffer();
      }
      size_t getMaxAttribs() const { return mState.getMaxAttribs(); }
      size_t getMaxBindings() const { return mState.getMaxBindings(); }
  
      const std::vector<VertexAttribute> &getVertexAttributes() const
      {
          return mState.getVertexAttributes();
      }
      const std::vector<VertexBinding> &getVertexBindings() const
      {
          return mState.getVertexBindings();
      }
  
      rx::VertexArrayImpl *getImplementation() const { return mVertexArray; }
  
      size_t getMaxEnabledAttribute() const { return mState.getMaxEnabledAttribute(); }
  
      enum DirtyBitType
      {
          DIRTY_BIT_ELEMENT_ARRAY_BUFFER,
  
          // Reserve bits for enabled flags
          DIRTY_BIT_ATTRIB_0_ENABLED,
          DIRTY_BIT_ATTRIB_MAX_ENABLED = DIRTY_BIT_ATTRIB_0_ENABLED + gl::MAX_VERTEX_ATTRIBS,
  
          // Reserve bits for attrib pointers
          DIRTY_BIT_ATTRIB_0_POINTER   = DIRTY_BIT_ATTRIB_MAX_ENABLED,
          DIRTY_BIT_ATTRIB_MAX_POINTER = DIRTY_BIT_ATTRIB_0_POINTER + gl::MAX_VERTEX_ATTRIBS,
  
          // Reserve bits for changes to VertexAttribFormat
          DIRTY_BIT_ATTRIB_0_FORMAT   = DIRTY_BIT_ATTRIB_MAX_POINTER,
          DIRTY_BIT_ATTRIB_MAX_FORMAT = DIRTY_BIT_ATTRIB_0_FORMAT + gl::MAX_VERTEX_ATTRIBS,
  
          // Reserve bits for changes to VertexAttribBinding
          DIRTY_BIT_ATTRIB_0_BINDING   = DIRTY_BIT_ATTRIB_MAX_FORMAT,
          DIRTY_BIT_ATTRIB_MAX_BINDING = DIRTY_BIT_ATTRIB_0_BINDING + gl::MAX_VERTEX_ATTRIBS,
  
          // Reserve bits for changes to BindVertexBuffer
          DIRTY_BIT_BINDING_0_BUFFER   = DIRTY_BIT_ATTRIB_MAX_BINDING,
          DIRTY_BIT_BINDING_MAX_BUFFER = DIRTY_BIT_BINDING_0_BUFFER + gl::MAX_VERTEX_ATTRIB_BINDINGS,
  
          // Reserve bits for binding divisors
          DIRTY_BIT_BINDING_0_DIVISOR = DIRTY_BIT_BINDING_MAX_BUFFER,
          DIRTY_BIT_BINDING_MAX_DIVISOR =
              DIRTY_BIT_BINDING_0_DIVISOR + gl::MAX_VERTEX_ATTRIB_BINDINGS,
  
          DIRTY_BIT_UNKNOWN = DIRTY_BIT_BINDING_MAX_DIVISOR,
          DIRTY_BIT_MAX     = DIRTY_BIT_UNKNOWN,
      };
  
      using DirtyBits = angle::BitSet<DIRTY_BIT_MAX>;
  
      static size_t GetVertexIndexFromDirtyBit(size_t dirtyBit);
  
      void syncImplState(const Context *context);
      bool hasAnyDirtyBit() const { return mDirtyBits.any(); }
  
    private:
      ~VertexArray();
  
      GLuint mId;
  
      VertexArrayState mState;
      DirtyBits mDirtyBits;
  
      rx::VertexArrayImpl *mVertexArray;
  };
  
  }  // namespace gl
  
  #endif // LIBANGLE_VERTEXARRAY_H_
  

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