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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrGLBufferImpl.h"
#include "GrGpuGL.h"
#define GL_CALL(GPU, X) GR_GL_CALL(GPU->glInterface(), X)
#ifdef SK_DEBUG
#define VALIDATE() this->validate()
#else
#define VALIDATE() do {} while(false)
#endif
// GL_STREAM_DRAW triggers an optimization in Chromium's GPU process where a client's vertex buffer
// objects are implemented as client-side-arrays on tile-deferred architectures.
#define DYNAMIC_USAGE_PARAM GR_GL_STREAM_DRAW
GrGLBufferImpl::GrGLBufferImpl(GrGpuGL* gpu, const Desc& desc, GrGLenum bufferType)
: fDesc(desc)
, fBufferType(bufferType)
, fLockPtr(NULL) {
if (0 == desc.fID) {
fCPUData = sk_malloc_flags(desc.fSizeInBytes, SK_MALLOC_THROW);
} else {
fCPUData = NULL;
}
VALIDATE();
}
void GrGLBufferImpl::release(GrGpuGL* gpu) {
// make sure we've not been abandoned or already released
if (NULL != fCPUData) {
VALIDATE();
sk_free(fCPUData);
fCPUData = NULL;
} else if (fDesc.fID && !fDesc.fIsWrapped) {
VALIDATE();
GL_CALL(gpu, DeleteBuffers(1, &fDesc.fID));
if (GR_GL_ARRAY_BUFFER == fBufferType) {
gpu->notifyVertexBufferDelete(fDesc.fID);
} else {
SkASSERT(GR_GL_ELEMENT_ARRAY_BUFFER == fBufferType);
gpu->notifyIndexBufferDelete(fDesc.fID);
}
fDesc.fID = 0;
}
fLockPtr = NULL;
}
void GrGLBufferImpl::abandon() {
fDesc.fID = 0;
fLockPtr = NULL;
sk_free(fCPUData);
fCPUData = NULL;
}
void GrGLBufferImpl::bind(GrGpuGL* gpu) const {
VALIDATE();
if (GR_GL_ARRAY_BUFFER == fBufferType) {
gpu->bindVertexBuffer(fDesc.fID);
} else {
SkASSERT(GR_GL_ELEMENT_ARRAY_BUFFER == fBufferType);
gpu->bindIndexBufferAndDefaultVertexArray(fDesc.fID);
}
}
void* GrGLBufferImpl::lock(GrGpuGL* gpu) {
VALIDATE();
SkASSERT(!this->isLocked());
if (0 == fDesc.fID) {
fLockPtr = fCPUData;
} else if (gpu->caps()->bufferLockSupport()) {
this->bind(gpu);
// Let driver know it can discard the old data
GL_CALL(gpu, BufferData(fBufferType,
(GrGLsizeiptr) fDesc.fSizeInBytes,
NULL,
fDesc.fDynamic ? DYNAMIC_USAGE_PARAM : GR_GL_STATIC_DRAW));
GR_GL_CALL_RET(gpu->glInterface(),
fLockPtr,
MapBuffer(fBufferType, GR_GL_WRITE_ONLY));
}
return fLockPtr;
}
void GrGLBufferImpl::unlock(GrGpuGL* gpu) {
VALIDATE();
SkASSERT(this->isLocked());
if (0 != fDesc.fID) {
SkASSERT(gpu->caps()->bufferLockSupport());
this->bind(gpu);
GL_CALL(gpu, UnmapBuffer(fBufferType));
}
fLockPtr = NULL;
}
bool GrGLBufferImpl::isLocked() const {
VALIDATE();
return NULL != fLockPtr;
}
bool GrGLBufferImpl::updateData(GrGpuGL* gpu, const void* src, size_t srcSizeInBytes) {
SkASSERT(!this->isLocked());
VALIDATE();
if (srcSizeInBytes > fDesc.fSizeInBytes) {
return false;
}
if (0 == fDesc.fID) {
memcpy(fCPUData, src, srcSizeInBytes);
return true;
}
this->bind(gpu);
GrGLenum usage = fDesc.fDynamic ? DYNAMIC_USAGE_PARAM : GR_GL_STATIC_DRAW;
#if GR_GL_USE_BUFFER_DATA_NULL_HINT
if (fDesc.fSizeInBytes == srcSizeInBytes) {
GL_CALL(gpu, BufferData(fBufferType, (GrGLsizeiptr) 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(gpu, BufferData(fBufferType, (GrGLsizeiptr) fDesc.fSizeInBytes, NULL, usage));
GL_CALL(gpu, BufferSubData(fBufferType, 0, (GrGLsizeiptr) 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..))
bool doSubData = false;
#if GR_GL_MAC_BUFFER_OBJECT_PERFOMANCE_WORKAROUND
static int N = 0;
// 128 was chosen experimentally. At 256 a slight hitchiness was noticed
// when dragging a Chromium window around with a canvas tab backgrounded.
doSubData = 0 == (N % 128);
++N;
#endif
if (doSubData) {
// The workaround is to do a glBufferData followed by glBufferSubData.
// Chromium's command buffer may turn a glBufferSubData where the size
// exactly matches the buffer size into a glBufferData. So we tack 1
// extra byte onto the glBufferData.
GL_CALL(gpu, BufferData(fBufferType, srcSizeInBytes + 1, NULL, usage));
GL_CALL(gpu, BufferSubData(fBufferType, 0, srcSizeInBytes, src));
} else {
GL_CALL(gpu, BufferData(fBufferType, srcSizeInBytes, src, usage));
}
#endif
return true;
}
void GrGLBufferImpl::validate() const {
SkASSERT(GR_GL_ARRAY_BUFFER == fBufferType || GR_GL_ELEMENT_ARRAY_BUFFER == fBufferType);
// The following assert isn't valid when the buffer has been abandoned:
// SkASSERT((0 == fDesc.fID) == (NULL != fCPUData));
SkASSERT(0 != fDesc.fID || !fDesc.fIsWrapped);
SkASSERT(NULL == fCPUData || NULL == fLockPtr || fCPUData == fLockPtr);
}
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