kc3-lang/angle/src/libGLESv2/geometry/backend.h

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• Hash : f8b58a0c
  Author :
  Date : 2010-03-26T04:08:45
  

  Support translating indices.
  
  TRAC #11393
  
  Signed-off-by: Nicolas Capens
  Signed-off-by: Daniel Koch
  Author:    Andrew Lewycky
  
  git-svn-id: https://angleproject.googlecode.com/svn/trunk@72 736b8ea6-26fd-11df-bfd4-992fa37f6226
  

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• src/libGLESv2/geometry/backend.h

• //
  // Copyright (c) 2002-2010 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.
  //
  
  // geometry/backend.h: Abstract classes BufferBackEnd, TranslatedVertexBuffer and TranslatedIndexBuffer
  // that must be implemented by any API-specific implementation of ANGLE.
  
  #ifndef LIBGLESV2_GEOMETRY_BACKEND_H_
  #define LIBGLESV2_GEOMETRY_BACKEND_H_
  
  #include <cstddef>
  
  #define GL_APICALL
  #include <GLES2/gl2.h>
  
  #include "Context.h"
  
  namespace gl
  {
  class TranslatedVertexBuffer;
  class TranslatedIndexBuffer;
  
  struct FormatConverter
  {
      bool identity;
      std::size_t outputVertexSize;
      void (*convertIndexed)(const void *in, std::size_t stride, Index minIndex, std::size_t n, const Index *indices, void *out);
      void (*convertArray)(const void *in, std::size_t stride, std::size_t n, void *out);
  };
  
  struct TranslatedAttribute
  {
      bool enabled;
  
      // These are the original untranslated values. (Or just have some sort of BufferBackEnd::TranslatedTypeKey.)
      GLenum type;
      std::size_t size;
      bool normalized;
  
      std::size_t offset;
  
      std::size_t stride; // 0 means not to advance the read pointer at all
  
      std::size_t programAttribute;
  
      TranslatedVertexBuffer *buffer;
  };
  
  class BufferBackEnd
  {
    public:
      virtual ~BufferBackEnd() { }
  
      virtual TranslatedVertexBuffer *createVertexBuffer(std::size_t size) = 0;
      virtual TranslatedIndexBuffer *createIndexBuffer(std::size_t size) = 0;
      virtual FormatConverter getFormatConverter(GLenum type, std::size_t size, bool normalize) = 0;
  
      virtual GLenum setupIndicesPreDraw(const TranslatedIndexData &indexInfo) = 0;
      virtual GLenum setupAttributesPreDraw(const TranslatedAttribute *attributes) = 0;
  };
  
  class TranslatedBuffer
  {
    public:
      explicit TranslatedBuffer(std::size_t size) : mBufferSize(size), mCurrentPoint(0) { }
      virtual ~TranslatedBuffer() { }
  
      std::size_t size() const { return mBufferSize; }
  
      virtual void *map() = 0;
      virtual void unmap() = 0;
  
      void reserveSpace(std::size_t requiredSpace);
  
      void *map(std::size_t requiredSpace, std::size_t *offset);
  
    protected:
      virtual void recycle() = 0;
      virtual void *streamingMap(std::size_t offset, std::size_t size) = 0;
  
    private:
      std::size_t mBufferSize;
      std::size_t mCurrentPoint;
  
      DISALLOW_COPY_AND_ASSIGN(TranslatedBuffer);
  };
  
  class TranslatedVertexBuffer : public TranslatedBuffer
  {
    public:
      explicit TranslatedVertexBuffer(std::size_t size) : TranslatedBuffer(size) { }
  };
  
  class TranslatedIndexBuffer : public TranslatedBuffer
  {
    public:
      explicit TranslatedIndexBuffer(std::size_t size) : TranslatedBuffer(size) { }
  };
  
  }
  
  #endif   // LIBGLESV2_GEOMETRY_BACKEND_H_
  

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