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

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• Author : Geoff Lang
  Date : 2015-05-05 13:12:36
  Hash : 520c4ae2
  Message : Add a Buffer::getIndexRange function. Instead of exposing the index range cache, add a more generic method that allows the buffers to handle their own caching of index ranges. BufferImpl::getData can be hard to implement for BufferGL because there isn't a way to tell the buffer to unmap and glGetBufferSubData can be very expensive, requiring an extra copy of the data. BUG=angleproject:881 Change-Id: Idec645219056132e0d72a410fbe7b971fa02c9e9 Reviewed-on: https://chromium-review.googlesource.com/261892 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Olli Etuaho <oetuaho@nvidia.com> Tested-by: Geoff Lang <geofflang@chromium.org>

• src/libANGLE/Buffer.h

• //
  // Copyright (c) 2002-2014 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.
  //
  
  // Buffer.h: Defines the gl::Buffer class, representing storage of vertex and/or
  // index data. Implements GL buffer objects and related functionality.
  // [OpenGL ES 2.0.24] section 2.9 page 21.
  
  #ifndef LIBANGLE_BUFFER_H_
  #define LIBANGLE_BUFFER_H_
  
  #include "common/angleutils.h"
  #include "libANGLE/Error.h"
  #include "libANGLE/IndexRangeCache.h"
  #include "libANGLE/RefCountObject.h"
  
  namespace rx
  {
  class BufferImpl;
  };
  
  namespace gl
  {
  
  class Buffer : public RefCountObject
  {
    public:
      Buffer(rx::BufferImpl *impl, GLuint id);
  
      virtual ~Buffer();
  
      Error bufferData(const void *data, GLsizeiptr size, GLenum usage);
      Error bufferSubData(const void *data, GLsizeiptr size, GLintptr offset);
      Error copyBufferSubData(Buffer* source, GLintptr sourceOffset, GLintptr destOffset, GLsizeiptr size);
      Error map(GLenum access);
      Error mapRange(GLintptr offset, GLsizeiptr length, GLbitfield access);
      Error unmap(GLboolean *result);
  
      void onTransformFeedback();
      void onPixelUnpack();
  
      Error getIndexRange(GLenum type, size_t offset, size_t count, RangeUI *outRange) const;
  
      GLenum getUsage() const { return mUsage; }
      GLbitfield getAccessFlags() const { return mAccessFlags; }
      GLenum getAccess() const { return mAccess; }
      GLboolean isMapped() const { return mMapped; }
      GLvoid *getMapPointer() const { return mMapPointer; }
      GLint64 getMapOffset() const { return mMapOffset; }
      GLint64 getMapLength() const { return mMapLength; }
      GLint64 getSize() const { return mSize; }
  
      rx::BufferImpl *getImplementation() const { return mBuffer; }
  
    private:
      rx::BufferImpl *mBuffer;
  
      GLenum mUsage;
      GLint64 mSize;
      GLbitfield mAccessFlags;
      GLenum mAccess;
      GLboolean mMapped;
      GLvoid *mMapPointer;
      GLint64 mMapOffset;
      GLint64 mMapLength;
  
      mutable IndexRangeCache mIndexRangeCache;
  };
  
  }
  
  #endif   // LIBANGLE_BUFFER_H_