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Fix cycling through buffers in buffer alloc pool

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Review URL: http://codereview.appspot.com/5716050/



git-svn-id: http://skia.googlecode.com/svn/trunk@3296 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
bsalomon@google.com 2012-03-01 20:59:28 +00:00
parent 9c88bafd28
commit b665a6b148
2 changed files with 26 additions and 9 deletions
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31
src/gpu/GrBufferAllocPool.cpp
View File

@ -40,9 +40,9 @@ GrBufferAllocPool::GrBufferAllocPool(GrGpu* gpu,
fMinBlockSize = GrMax(GrBufferAllocPool_MIN_BLOCK_SIZE, blockSize);
fBytesInUse = 0;
fPreallocBuffersInUse = 0;
fFirstPreallocBuffer = 0;
fPreallocBufferStartIdx = 0;
for (int i = 0; i < preallocBufferCnt; ++i) {
GrGeometryBuffer* buffer = this->createBuffer(fMinBlockSize);
if (NULL != buffer) {
@ -82,13 +82,16 @@ void GrBufferAllocPool::reset() {
buffer->unlock();
}
}
// fPreallocBuffersInUse will be decremented down to zero in the while loop
int preallocBuffersInUse = fPreallocBuffersInUse;
while (!fBlocks.empty()) {
destroyBlock();
this->destroyBlock();
}
if (fPreallocBuffers.count()) {
// must set this after above loop.
fFirstPreallocBuffer = (fFirstPreallocBuffer + fPreallocBuffersInUse) %
fPreallocBuffers.count();
fPreallocBufferStartIdx = (fPreallocBufferStartIdx +
preallocBuffersInUse) %
fPreallocBuffers.count();
}
// we may have created a large cpu mirror of a large VB. Reset the size
// to match our pre-allocated VBs.
@ -216,6 +219,12 @@ int GrBufferAllocPool::preallocatedBufferCount() const {
void GrBufferAllocPool::putBack(size_t bytes) {
VALIDATE();
// if the putBack unwinds all the preallocated buffers then we will
// advance the starting index. As blocks are destroyed fPreallocBuffersInUse
// will be decremented. I will reach zero if all blocks using preallocated
// buffers are released.
int preallocBuffersInUse = fPreallocBuffersInUse;
while (bytes) {
// caller shouldnt try to put back more than they've taken
GrAssert(!fBlocks.empty());
@ -237,6 +246,11 @@ void GrBufferAllocPool::putBack(size_t bytes) {
break;
}
}
if (!fPreallocBuffersInUse && fPreallocBuffers.count()) {
fPreallocBufferStartIdx = (fPreallocBufferStartIdx +
preallocBuffersInUse) %
fPreallocBuffers.count();
}
VALIDATE();
}
@ -252,8 +266,9 @@ bool GrBufferAllocPool::createBlock(size_t requestSize) {
if (size == fMinBlockSize &&
fPreallocBuffersInUse < fPreallocBuffers.count()) {
uint32_t nextBuffer = (fPreallocBuffersInUse + fFirstPreallocBuffer) %
fPreallocBuffers.count();
uint32_t nextBuffer = (fPreallocBuffersInUse +
fPreallocBufferStartIdx) %
fPreallocBuffers.count();
block.fBuffer = fPreallocBuffers[nextBuffer];
block.fBuffer->ref();
++fPreallocBuffersInUse;
@ -301,7 +316,7 @@ void GrBufferAllocPool::destroyBlock() {
BufferBlock& block = fBlocks.back();
if (fPreallocBuffersInUse > 0) {
uint32_t prevPreallocBuffer = (fPreallocBuffersInUse +
fFirstPreallocBuffer +
fPreallocBufferStartIdx +
(fPreallocBuffers.count() - 1)) %
fPreallocBuffers.count();
if (block.fBuffer == fPreallocBuffers[prevPreallocBuffer]) {

4
src/gpu/GrBufferAllocPool.h
View File

@ -176,7 +176,9 @@ private:
SkTArray<BufferBlock> fBlocks;
int fPreallocBuffersInUse;
int fFirstPreallocBuffer;
// We attempt to cycle through the preallocated buffers rather than
// always starting from the first.
int fPreallocBufferStartIdx;
SkAutoMalloc fCpuData;
void* fBufferPtr;
};