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

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• Hash : ded7923b
  Author :
  Date : 2017-11-28T15:21:11
  

  GL backend: Only synchronize transform feedback state when it changes.
  
  BUG=angleproject:2188
  
  Change-Id: I5bfcc038c887dde0770564d103eb3cb234b248c9
  Reviewed-on: https://chromium-review.googlesource.com/794100
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  

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• src/libANGLE/renderer/gl/TransformFeedbackGL.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.
  //
  
  // TransformFeedbackGL.cpp: Implements the class methods for TransformFeedbackGL.
  
  #include "libANGLE/renderer/gl/TransformFeedbackGL.h"
  
  #include "common/debug.h"
  #include "libANGLE/ContextState.h"
  #include "libANGLE/renderer/gl/BufferGL.h"
  #include "libANGLE/renderer/gl/FunctionsGL.h"
  #include "libANGLE/renderer/gl/StateManagerGL.h"
  
  namespace rx
  {
  
  TransformFeedbackGL::TransformFeedbackGL(const gl::TransformFeedbackState &state,
                                           const FunctionsGL *functions,
                                           StateManagerGL *stateManager)
      : TransformFeedbackImpl(state),
        mFunctions(functions),
        mStateManager(stateManager),
        mTransformFeedbackID(0),
        mIsActive(false),
        mIsPaused(false)
  {
      mFunctions->genTransformFeedbacks(1, &mTransformFeedbackID);
  }
  
  TransformFeedbackGL::~TransformFeedbackGL()
  {
      mStateManager->deleteTransformFeedback(mTransformFeedbackID);
      mTransformFeedbackID = 0;
  }
  
  void TransformFeedbackGL::begin(GLenum primitiveMode)
  {
      mStateManager->onTransformFeedbackStateChange();
  }
  
  void TransformFeedbackGL::end()
  {
      mStateManager->onTransformFeedbackStateChange();
  
      // Immediately end the transform feedback so that the results are visible.
      syncActiveState(false, GL_NONE);
  }
  
  void TransformFeedbackGL::pause()
  {
      mStateManager->onTransformFeedbackStateChange();
  
      syncPausedState(true);
  }
  
  void TransformFeedbackGL::resume()
  {
      mStateManager->onTransformFeedbackStateChange();
  }
  
  void TransformFeedbackGL::bindGenericBuffer(const gl::BindingPointer<gl::Buffer> &binding)
  {
  }
  
  void TransformFeedbackGL::bindIndexedBuffer(size_t index,
                                              const gl::OffsetBindingPointer<gl::Buffer> &binding)
  {
      // Directly bind buffer (not through the StateManager methods) because the buffer bindings are
      // tracked per transform feedback object
      mStateManager->bindTransformFeedback(GL_TRANSFORM_FEEDBACK, mTransformFeedbackID);
      if (binding.get() != nullptr)
      {
          const BufferGL *bufferGL = GetImplAs<BufferGL>(binding.get());
          if (binding.getSize() != 0)
          {
              mFunctions->bindBufferRange(GL_TRANSFORM_FEEDBACK_BUFFER, static_cast<GLuint>(index),
                                          bufferGL->getBufferID(), binding.getOffset(),
                                          binding.getSize());
          }
          else
          {
              mFunctions->bindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, static_cast<GLuint>(index),
                                         bufferGL->getBufferID());
          }
      }
      else
      {
          mFunctions->bindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, static_cast<GLuint>(index), 0);
      }
  }
  
  GLuint TransformFeedbackGL::getTransformFeedbackID() const
  {
      return mTransformFeedbackID;
  }
  
  void TransformFeedbackGL::syncActiveState(bool active, GLenum primitiveMode) const
  {
      if (mIsActive != active)
      {
          mIsActive = active;
          mIsPaused = false;
  
          mStateManager->bindTransformFeedback(GL_TRANSFORM_FEEDBACK, mTransformFeedbackID);
          if (mIsActive)
          {
              mFunctions->beginTransformFeedback(primitiveMode);
          }
          else
          {
              mFunctions->endTransformFeedback();
          }
      }
  }
  
  void TransformFeedbackGL::syncPausedState(bool paused) const
  {
      if (mIsActive && mIsPaused != paused)
      {
          mIsPaused = paused;
  
          mStateManager->bindTransformFeedback(GL_TRANSFORM_FEEDBACK, mTransformFeedbackID);
          if (mIsPaused)
          {
              mFunctions->pauseTransformFeedback();
          }
          else
          {
              mFunctions->resumeTransformFeedback();
          }
      }
  }
  
  }
  

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