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

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• Hash : 0946393d
  Author :
  Date : 2018-04-04T05:26:59
  

  Move Buffer Subject/Observer to front end.
  
  This makes BufferImpl into an Observer Subject. It also refactors
  the Vertex Array updates for the D3D11 backend use more of a dirty
  bit coding style.
  
  This change makes it so Buffer contents changes trigger front-end
  dirty bits from the back-end, which may be undesirable.
  
  Bug: angleproject:2389
  Change-Id: Iac8ce1171284a86851c18cd1373ddf24fcefe40b
  Reviewed-on: https://chromium-review.googlesource.com/979812
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• src/libANGLE/Buffer.cpp

• //
  // 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.cpp: Implements 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.
  
  #include "libANGLE/Buffer.h"
  
  #include "libANGLE/Context.h"
  #include "libANGLE/renderer/BufferImpl.h"
  #include "libANGLE/renderer/GLImplFactory.h"
  
  namespace gl
  {
  
  BufferState::BufferState()
      : mLabel(),
        mUsage(BufferUsage::StaticDraw),
        mSize(0),
        mAccessFlags(0),
        mAccess(GL_WRITE_ONLY_OES),
        mMapped(GL_FALSE),
        mMapPointer(nullptr),
        mMapOffset(0),
        mMapLength(0),
        mBindingCount(0),
        mTransformFeedbackBindingCount(0)
  {
  }
  
  BufferState::~BufferState()
  {
  }
  
  Buffer::Buffer(rx::GLImplFactory *factory, GLuint id)
      : RefCountObject(id), mImpl(factory->createBuffer(mState))
  {
  }
  
  Buffer::~Buffer()
  {
      SafeDelete(mImpl);
  }
  
  Error Buffer::onDestroy(const Context *context)
  {
      // In tests, mImpl might be null.
      if (mImpl)
          mImpl->destroy(context);
      return NoError();
  }
  
  void Buffer::setLabel(const std::string &label)
  {
      mState.mLabel = label;
  }
  
  const std::string &Buffer::getLabel() const
  {
      return mState.mLabel;
  }
  
  Error Buffer::bufferData(const Context *context,
                           BufferBinding target,
                           const void *data,
                           GLsizeiptr size,
                           BufferUsage usage)
  {
      const void *dataForImpl = data;
  
      // If we are using robust resource init, make sure the buffer starts cleared.
      // Note: the Context is checked for nullptr because of some testing code.
      // TODO(jmadill): Investigate lazier clearing.
      if (context && context->getGLState().isRobustResourceInitEnabled() && !data && size > 0)
      {
          angle::MemoryBuffer *scratchBuffer = nullptr;
          ANGLE_TRY(context->getZeroFilledBuffer(static_cast<size_t>(size), &scratchBuffer));
          dataForImpl = scratchBuffer->data();
      }
  
      ANGLE_TRY(mImpl->setData(context, target, dataForImpl, size, usage));
  
      mIndexRangeCache.clear();
      mState.mUsage = usage;
      mState.mSize  = size;
  
      // Notify when data changes.
      mImpl->onStateChange(context, angle::SubjectMessage::CONTENTS_CHANGED);
  
      return NoError();
  }
  
  Error Buffer::bufferSubData(const Context *context,
                              BufferBinding target,
                              const void *data,
                              GLsizeiptr size,
                              GLintptr offset)
  {
      ANGLE_TRY(mImpl->setSubData(context, target, data, size, offset));
  
      mIndexRangeCache.invalidateRange(static_cast<unsigned int>(offset), static_cast<unsigned int>(size));
  
      // Notify when data changes.
      mImpl->onStateChange(context, angle::SubjectMessage::CONTENTS_CHANGED);
  
      return NoError();
  }
  
  Error Buffer::copyBufferSubData(const Context *context,
                                  Buffer *source,
                                  GLintptr sourceOffset,
                                  GLintptr destOffset,
                                  GLsizeiptr size)
  {
      ANGLE_TRY(
          mImpl->copySubData(context, source->getImplementation(), sourceOffset, destOffset, size));
  
      mIndexRangeCache.invalidateRange(static_cast<unsigned int>(destOffset), static_cast<unsigned int>(size));
  
      // Notify when data changes.
      mImpl->onStateChange(context, angle::SubjectMessage::CONTENTS_CHANGED);
  
      return NoError();
  }
  
  Error Buffer::map(const Context *context, GLenum access)
  {
      ASSERT(!mState.mMapped);
  
      mState.mMapPointer = nullptr;
      ANGLE_TRY(mImpl->map(context, access, &mState.mMapPointer));
  
      ASSERT(access == GL_WRITE_ONLY_OES);
  
      mState.mMapped      = GL_TRUE;
      mState.mMapOffset   = 0;
      mState.mMapLength   = mState.mSize;
      mState.mAccess      = access;
      mState.mAccessFlags = GL_MAP_WRITE_BIT;
      mIndexRangeCache.clear();
  
      return NoError();
  }
  
  Error Buffer::mapRange(const Context *context,
                         GLintptr offset,
                         GLsizeiptr length,
                         GLbitfield access)
  {
      ASSERT(!mState.mMapped);
      ASSERT(offset + length <= mState.mSize);
  
      mState.mMapPointer = nullptr;
      ANGLE_TRY(mImpl->mapRange(context, offset, length, access, &mState.mMapPointer));
  
      mState.mMapped      = GL_TRUE;
      mState.mMapOffset   = static_cast<GLint64>(offset);
      mState.mMapLength   = static_cast<GLint64>(length);
      mState.mAccess      = GL_WRITE_ONLY_OES;
      mState.mAccessFlags = access;
  
      // The OES_mapbuffer extension states that GL_WRITE_ONLY_OES is the only valid
      // value for GL_BUFFER_ACCESS_OES because it was written against ES2.  Since there is
      // no update for ES3 and the GL_READ_ONLY and GL_READ_WRITE enums don't exist for ES,
      // we cannot properly set GL_BUFFER_ACCESS_OES when glMapBufferRange is called.
  
      if ((access & GL_MAP_WRITE_BIT) > 0)
      {
          mIndexRangeCache.invalidateRange(static_cast<unsigned int>(offset), static_cast<unsigned int>(length));
      }
  
      return NoError();
  }
  
  Error Buffer::unmap(const Context *context, GLboolean *result)
  {
      ASSERT(mState.mMapped);
  
      *result = GL_FALSE;
      ANGLE_TRY(mImpl->unmap(context, result));
  
      mState.mMapped      = GL_FALSE;
      mState.mMapPointer  = nullptr;
      mState.mMapOffset   = 0;
      mState.mMapLength   = 0;
      mState.mAccess      = GL_WRITE_ONLY_OES;
      mState.mAccessFlags = 0;
  
      // Notify when data changes.
      mImpl->onStateChange(context, angle::SubjectMessage::CONTENTS_CHANGED);
  
      return NoError();
  }
  
  void Buffer::onTransformFeedback(const Context *context)
  {
      mIndexRangeCache.clear();
  
      // Notify when data changes.
      mImpl->onStateChange(context, angle::SubjectMessage::CONTENTS_CHANGED);
  }
  
  void Buffer::onPixelPack(const Context *context)
  {
      mIndexRangeCache.clear();
  
      // Notify when data changes.
      mImpl->onStateChange(context, angle::SubjectMessage::CONTENTS_CHANGED);
  }
  
  Error Buffer::getIndexRange(const gl::Context *context,
                              GLenum type,
                              size_t offset,
                              size_t count,
                              bool primitiveRestartEnabled,
                              IndexRange *outRange) const
  {
      if (mIndexRangeCache.findRange(type, offset, count, primitiveRestartEnabled, outRange))
      {
          return NoError();
      }
  
      ANGLE_TRY(
          mImpl->getIndexRange(context, type, offset, count, primitiveRestartEnabled, outRange));
  
      mIndexRangeCache.addRange(type, offset, count, primitiveRestartEnabled, *outRange);
  
      return NoError();
  }
  
  bool Buffer::isBound() const
  {
      return mState.mBindingCount;
  }
  
  bool Buffer::isBoundForTransformFeedbackAndOtherUse() const
  {
      return mState.mTransformFeedbackBindingCount > 0 &&
             mState.mTransformFeedbackBindingCount != mState.mBindingCount;
  }
  
  void Buffer::onBindingChanged(bool bound, BufferBinding target)
  {
      ASSERT(bound || mState.mBindingCount > 0);
      mState.mBindingCount += bound ? 1 : -1;
      if (target == BufferBinding::TransformFeedback)
      {
          ASSERT(bound || mState.mTransformFeedbackBindingCount > 0);
          mState.mTransformFeedbackBindingCount += bound ? 1 : -1;
      }
  }
  
  }  // namespace gl
  

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