void VertexDataManager::prepareStaticBufferForAttribute(const gl::VertexAttribute &attrib,
const gl::VertexAttribCurrentValueData ¤tValue) const
{
gl::Buffer *buffer = attrib.buffer.get();
if (buffer)
{
BufferD3D *bufferImpl = GetImplAs<BufferD3D>(buffer);
// This will create the static buffer in the right circumstances
StaticVertexBufferInterface *staticBuffer = bufferImpl->getStaticVertexBufferForAttribute(attrib);
UNUSED_ASSERTION_VARIABLE(staticBuffer);
// This check validates that a valid static vertex buffer was returned above
ASSERT(!(staticBuffer &&
staticBuffer->getBufferSize() > 0 &&
!staticBuffer->lookupAttribute(attrib, NULL) &&
!staticBuffer->directStoragePossible(attrib, currentValue)));
}
}
gl::Error VertexDataManager::reserveSpaceForAttrib(const gl::VertexAttribute &attrib,
const gl::VertexAttribCurrentValueData ¤tValue,
GLsizei count,
GLsizei instances) const
{
gl::Buffer *buffer = attrib.buffer.get();
BufferD3D *bufferImpl = buffer ? GetImplAs<BufferD3D>(buffer) : NULL;
StaticVertexBufferInterface *staticBuffer = bufferImpl ? bufferImpl->getStaticVertexBufferForAttribute(attrib) : NULL;
VertexBufferInterface *vertexBuffer = staticBuffer ? staticBuffer : static_cast<VertexBufferInterface*>(mStreamingBuffer);
if (!vertexBuffer->directStoragePossible(attrib, currentValue))
{
if (staticBuffer)
{
if (staticBuffer->getBufferSize() == 0)
{
int totalCount = ElementsInBuffer(attrib, bufferImpl->getSize());
gl::Error error = staticBuffer->reserveVertexSpace(attrib, totalCount, 0);
if (error.isError())
{
return error;
}
}
}
else
{
int totalCount = StreamingBufferElementCount(attrib, count, instances);
ASSERT(!bufferImpl || ElementsInBuffer(attrib, bufferImpl->getSize()) >= totalCount);
gl::Error error = mStreamingBuffer->reserveVertexSpace(attrib, totalCount, instances);
if (error.isError())
{
return error;
}
}
}
return gl::Error(GL_NO_ERROR);
}
gl::Error VertexDataManager::storeAttribute(const gl::VertexAttribute &attrib,
const gl::VertexAttribCurrentValueData ¤tValue,
TranslatedAttribute *translated,
GLint start,
GLsizei count,
GLsizei instances)
{
gl::Buffer *buffer = attrib.buffer.get();
ASSERT(buffer || attrib.pointer);
BufferD3D *storage = buffer ? GetImplAs<BufferD3D>(buffer) : NULL;
StaticVertexBufferInterface *staticBuffer = storage ? storage->getStaticVertexBufferForAttribute(attrib) : NULL;
VertexBufferInterface *vertexBuffer = staticBuffer ? staticBuffer : static_cast<VertexBufferInterface*>(mStreamingBuffer);
bool directStorage = vertexBuffer->directStoragePossible(attrib, currentValue);
unsigned int streamOffset = 0;
unsigned int outputElementSize = 0;
// Instanced vertices do not apply the 'start' offset
GLint firstVertexIndex = (instances > 0 && attrib.divisor > 0 ? 0 : start);
if (directStorage)
{
outputElementSize = ComputeVertexAttributeStride(attrib);
streamOffset = static_cast<unsigned int>(attrib.offset + outputElementSize * firstVertexIndex);
}
else if (staticBuffer)
{
gl::Error error = staticBuffer->getVertexBuffer()->getSpaceRequired(attrib, 1, 0, &outputElementSize);
if (error.isError())
{
return error;
}
if (!staticBuffer->lookupAttribute(attrib, &streamOffset))
{
// Convert the entire buffer
int totalCount = ElementsInBuffer(attrib, storage->getSize());
int startIndex = attrib.offset / ComputeVertexAttributeStride(attrib);
error = staticBuffer->storeVertexAttributes(attrib, currentValue, -startIndex, totalCount,
0, &streamOffset);
// Each staticBuffer only contains the data for one attribute, so we know that it won't be modified again.
// We can therefore safely unmap it here without hurting perf.
staticBuffer->getVertexBuffer()->hintUnmapResource();
if (error.isError())
{
return error;
}
}
unsigned int firstElementOffset = (attrib.offset / ComputeVertexAttributeStride(attrib)) * outputElementSize;
unsigned int startOffset = (instances == 0 || attrib.divisor == 0) ? firstVertexIndex * outputElementSize : 0;
if (streamOffset + firstElementOffset + startOffset < streamOffset)
{
return gl::Error(GL_OUT_OF_MEMORY);
}
streamOffset += firstElementOffset + startOffset;
}
else
{
int totalCount = StreamingBufferElementCount(attrib, count, instances);
gl::Error error = mStreamingBuffer->getVertexBuffer()->getSpaceRequired(attrib, 1, 0, &outputElementSize);
if (error.isError())
{
return error;
}
error = mStreamingBuffer->storeVertexAttributes(attrib, currentValue, firstVertexIndex,
totalCount, instances, &streamOffset);
if (error.isError())
{
return error;
}
}
translated->storage = directStorage ? storage : NULL;
translated->vertexBuffer = vertexBuffer->getVertexBuffer();
translated->serial = directStorage ? storage->getSerial() : vertexBuffer->getSerial();
translated->divisor = attrib.divisor;
translated->attribute = &attrib;
translated->currentValueType = currentValue.Type;
translated->stride = outputElementSize;
translated->offset = streamOffset;
return gl::Error(GL_NO_ERROR);
}