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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrGLIndexBuffer.h"
#include "GrGpuGL.h"
#define GPUGL static_cast<GrGpuGL*>(getGpu())
#define GL_CALL(X) GR_GL_CALL(GPUGL->glInterface(), X)
GrGLIndexBuffer::GrGLIndexBuffer(GrGpuGL* gpu,
GrGLuint id,
size_t sizeInBytes,
bool dynamic)
: INHERITED(gpu, sizeInBytes, dynamic)
, fBufferID(id)
, fLockPtr(NULL) {
}
void GrGLIndexBuffer::onRelease() {
// make sure we've not been abandoned
if (fBufferID) {
GPUGL->notifyIndexBufferDelete(this);
GL_CALL(DeleteBuffers(1, &fBufferID));
fBufferID = 0;
}
INHERITED::onRelease();
}
void GrGLIndexBuffer::onAbandon() {
fBufferID = 0;
fLockPtr = NULL;
INHERITED::onAbandon();
}
void GrGLIndexBuffer::bind() const {
GL_CALL(BindBuffer(GR_GL_ELEMENT_ARRAY_BUFFER, fBufferID));
GPUGL->notifyIndexBufferBind(this);
}
GrGLuint GrGLIndexBuffer::bufferID() const {
return fBufferID;
}
void* GrGLIndexBuffer::lock() {
GrAssert(fBufferID);
GrAssert(!isLocked());
if (this->getGpu()->getCaps().bufferLockSupport()) {
this->bind();
// Let driver know it can discard the old data
GL_CALL(BufferData(GR_GL_ELEMENT_ARRAY_BUFFER,
this->sizeInBytes(),
NULL,
this->dynamic() ? GR_GL_DYNAMIC_DRAW :
GR_GL_STATIC_DRAW));
GR_GL_CALL_RET(GPUGL->glInterface(),
fLockPtr,
MapBuffer(GR_GL_ELEMENT_ARRAY_BUFFER,
GR_GL_WRITE_ONLY));
return fLockPtr;
}
return NULL;
}
void* GrGLIndexBuffer::lockPtr() const {
return fLockPtr;
}
void GrGLIndexBuffer::unlock() {
GrAssert(fBufferID);
GrAssert(isLocked());
GrAssert(this->getGpu()->getCaps().bufferLockSupport());
this->bind();
GL_CALL(UnmapBuffer(GR_GL_ELEMENT_ARRAY_BUFFER));
fLockPtr = NULL;
}
bool GrGLIndexBuffer::isLocked() const {
// this check causes a lot of noise in the gl log
#if 0
if (this->isValid() && this->getGpu()->getCaps().fBufferLockSupport) {
this->bind();
GrGLint mapped;
GL_CALL(GetBufferParameteriv(GR_GL_ELEMENT_ARRAY_BUFFER,
GR_GL_BUFFER_MAPPED, &mapped));
GrAssert(!!mapped == !!fLockPtr);
}
#endif
return NULL != fLockPtr;
}
bool GrGLIndexBuffer::updateData(const void* src, size_t srcSizeInBytes) {
GrAssert(fBufferID);
GrAssert(!isLocked());
if (srcSizeInBytes > this->sizeInBytes()) {
return false;
}
this->bind();
GrGLenum usage = dynamic() ? GR_GL_DYNAMIC_DRAW : GR_GL_STATIC_DRAW;
#if GR_GL_USE_BUFFER_DATA_NULL_HINT
if (this->sizeInBytes() == srcSizeInBytes) {
GL_CALL(BufferData(GR_GL_ELEMENT_ARRAY_BUFFER,
srcSizeInBytes, src, usage));
} else {
// Before we call glBufferSubData we give the driver a hint using
// glBufferData with NULL. This makes the old buffer contents
// inaccessible to future draws. The GPU may still be processing
// draws that reference the old contents. With this hint it can
// assign a different allocation for the new contents to avoid
// flushing the gpu past draws consuming the old contents.
GL_CALL(BufferData(GR_GL_ELEMENT_ARRAY_BUFFER,
this->sizeInBytes(), NULL, usage));
GL_CALL(BufferSubData(GR_GL_ELEMENT_ARRAY_BUFFER,
0, srcSizeInBytes, src));
}
#else
// Note that we're cheating on the size here. Currently no methods
// allow a partial update that preserves contents of non-updated
// portions of the buffer (lock() does a glBufferData(..size, NULL..))
GL_CALL(BufferData(GR_GL_ELEMENT_ARRAY_BUFFER,
srcSizeInBytes, src, usage));
#endif
return true;
}
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