kc3-lang/angle/src/libANGLE/renderer/gl/BufferGL.cpp

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• Hash : 8f775607
  Author :
  Date : 2016-11-03T16:45:34
  

  Introduce a gl::BufferState class.
  
  This state can share vital pieces of information with the impl.
  The most elementary state is the buffer size, which then the
  impl doesn't need to replicate.
  
  BUG=angleproject:1579
  
  Change-Id: I341393c64a6e49de65c1d53b1bad2fa143209862
  Reviewed-on: https://chromium-review.googlesource.com/406644
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  

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• src/libANGLE/renderer/gl/BufferGL.cpp

• //
  // Copyright 2015 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.
  //
  
  // BufferGL.cpp: Implements the class methods for BufferGL.
  
  #include "libANGLE/renderer/gl/BufferGL.h"
  
  #include "common/debug.h"
  #include "common/utilities.h"
  #include "libANGLE/angletypes.h"
  #include "libANGLE/formatutils.h"
  #include "libANGLE/renderer/gl/FunctionsGL.h"
  #include "libANGLE/renderer/gl/StateManagerGL.h"
  #include "libANGLE/renderer/gl/renderergl_utils.h"
  
  namespace rx
  {
  
  // Use the GL_COPY_READ_BUFFER binding when two buffers need to be bound simultaneously.
  // GL_ELEMENT_ARRAY_BUFFER is supported on more versions but can modify the state of the currently
  // bound VAO.  Two simultaneous buffer bindings are only needed for glCopyBufferSubData which also
  // adds the GL_COPY_READ_BUFFER binding.
  static const GLenum SourceBufferOperationTarget = GL_COPY_READ_BUFFER;
  
  // Use the GL_ELEMENT_ARRAY_BUFFER binding for most operations since it's available on all
  // supported GL versions and doesn't affect any current state when it changes.
  static const GLenum DestBufferOperationTarget = GL_ARRAY_BUFFER;
  
  BufferGL::BufferGL(const gl::BufferState &state,
                     const FunctionsGL *functions,
                     StateManagerGL *stateManager)
      : BufferImpl(state),
        mIsMapped(false),
        mMapOffset(0),
        mMapSize(0),
        mShadowBufferData(!CanMapBufferForRead(functions)),
        mShadowCopy(),
        mBufferSize(0),
        mFunctions(functions),
        mStateManager(stateManager),
        mBufferID(0)
  {
      ASSERT(mFunctions);
      ASSERT(mStateManager);
  
      mFunctions->genBuffers(1, &mBufferID);
  }
  
  BufferGL::~BufferGL()
  {
      mStateManager->deleteBuffer(mBufferID);
      mBufferID = 0;
  }
  
  gl::Error BufferGL::setData(GLenum /*target*/, const void *data, size_t size, GLenum usage)
  {
      mStateManager->bindBuffer(DestBufferOperationTarget, mBufferID);
      mFunctions->bufferData(DestBufferOperationTarget, size, data, usage);
  
      if (mShadowBufferData)
      {
          if (!mShadowCopy.resize(size))
          {
              return gl::Error(GL_OUT_OF_MEMORY, "Failed to resize buffer data shadow copy.");
          }
  
          if (size > 0 && data != nullptr)
          {
              memcpy(mShadowCopy.data(), data, size);
          }
      }
  
      mBufferSize = size;
  
      return gl::Error(GL_NO_ERROR);
  }
  
  gl::Error BufferGL::setSubData(GLenum /*target*/, const void *data, size_t size, size_t offset)
  {
      mStateManager->bindBuffer(DestBufferOperationTarget, mBufferID);
      mFunctions->bufferSubData(DestBufferOperationTarget, offset, size, data);
  
      if (mShadowBufferData && size > 0)
      {
          memcpy(mShadowCopy.data() + offset, data, size);
      }
  
      return gl::Error(GL_NO_ERROR);
  }
  
  gl::Error BufferGL::copySubData(BufferImpl* source, GLintptr sourceOffset, GLintptr destOffset, GLsizeiptr size)
  {
      BufferGL *sourceGL = GetAs<BufferGL>(source);
  
      mStateManager->bindBuffer(DestBufferOperationTarget, mBufferID);
      mStateManager->bindBuffer(SourceBufferOperationTarget, sourceGL->getBufferID());
  
      mFunctions->copyBufferSubData(SourceBufferOperationTarget, DestBufferOperationTarget, sourceOffset, destOffset, size);
  
      if (mShadowBufferData && size > 0)
      {
          ASSERT(sourceGL->mShadowBufferData);
          memcpy(mShadowCopy.data() + destOffset, sourceGL->mShadowCopy.data() + sourceOffset, size);
      }
  
      return gl::Error(GL_NO_ERROR);
  }
  
  gl::Error BufferGL::map(GLenum access, GLvoid **mapPtr)
  {
      if (mShadowBufferData)
      {
          *mapPtr = mShadowCopy.data();
      }
      else
      {
          mStateManager->bindBuffer(DestBufferOperationTarget, mBufferID);
          *mapPtr = mFunctions->mapBuffer(DestBufferOperationTarget, access);
      }
  
      mIsMapped = true;
      mMapOffset = 0;
      mMapSize   = mBufferSize;
  
      return gl::Error(GL_NO_ERROR);
  }
  
  gl::Error BufferGL::mapRange(size_t offset, size_t length, GLbitfield access, GLvoid **mapPtr)
  {
      if (mShadowBufferData)
      {
          *mapPtr = mShadowCopy.data() + offset;
      }
      else
      {
          mStateManager->bindBuffer(DestBufferOperationTarget, mBufferID);
          *mapPtr = mFunctions->mapBufferRange(DestBufferOperationTarget, offset, length, access);
      }
  
      mIsMapped = true;
      mMapOffset = offset;
      mMapSize   = length;
  
      return gl::Error(GL_NO_ERROR);
  }
  
  gl::Error BufferGL::unmap(GLboolean *result)
  {
      ASSERT(result);
      ASSERT(mIsMapped);
  
      if (mShadowBufferData)
      {
          mStateManager->bindBuffer(DestBufferOperationTarget, mBufferID);
          mFunctions->bufferSubData(DestBufferOperationTarget, mMapOffset, mMapSize,
                                    mShadowCopy.data() + mMapOffset);
          *result = GL_TRUE;
      }
      else
      {
          mStateManager->bindBuffer(DestBufferOperationTarget, mBufferID);
          *result = mFunctions->unmapBuffer(DestBufferOperationTarget);
      }
  
      mIsMapped = false;
      return gl::Error(GL_NO_ERROR);
  }
  
  gl::Error BufferGL::getIndexRange(GLenum type,
                                    size_t offset,
                                    size_t count,
                                    bool primitiveRestartEnabled,
                                    gl::IndexRange *outRange)
  {
      ASSERT(!mIsMapped);
  
      if (mShadowBufferData)
      {
          *outRange = gl::ComputeIndexRange(type, mShadowCopy.data() + offset, count,
                                            primitiveRestartEnabled);
      }
      else
      {
          mStateManager->bindBuffer(DestBufferOperationTarget, mBufferID);
  
          const gl::Type &typeInfo  = gl::GetTypeInfo(type);
          const uint8_t *bufferData = MapBufferRangeWithFallback(
              mFunctions, DestBufferOperationTarget, offset, count * typeInfo.bytes, GL_MAP_READ_BIT);
          *outRange = gl::ComputeIndexRange(type, bufferData, count, primitiveRestartEnabled);
          mFunctions->unmapBuffer(DestBufferOperationTarget);
      }
  
      return gl::Error(GL_NO_ERROR);
  }
  
  GLuint BufferGL::getBufferID() const
  {
      return mBufferID;
  }
  
  }
  

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