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//
// 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)
{
// Do not begin directly, StateManagerGL will handle beginning and resuming transform feedback.
}
void TransformFeedbackGL::end()
{
syncActiveState(false, GL_NONE);
}
void TransformFeedbackGL::pause()
{
syncPausedState(true);
}
void TransformFeedbackGL::resume()
{
// Do not resume directly, StateManagerGL will handle beginning and resuming transform feedback.
}
void TransformFeedbackGL::bindGenericBuffer(const BindingPointer<gl::Buffer> &binding)
{
}
void TransformFeedbackGL::bindIndexedBuffer(size_t index, const 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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