GLenum VertexDataManager::prepareVertexData(const gl::VertexAttribute attribs[], gl::ProgramBinary *programBinary, GLint start, GLsizei count, TranslatedAttribute *translated, GLsizei instances)
{
if (!mStreamingBuffer)
{
return GL_OUT_OF_MEMORY;
}
for (int attributeIndex = 0; attributeIndex < gl::MAX_VERTEX_ATTRIBS; attributeIndex++)
{
translated[attributeIndex].active = (programBinary->getSemanticIndex(attributeIndex) != -1);
}
// Invalidate static buffers that don't contain matching attributes
for (int i = 0; i < gl::MAX_VERTEX_ATTRIBS; i++)
{
if (translated[i].active && attribs[i].mArrayEnabled)
{
gl::Buffer *buffer = attribs[i].mBoundBuffer.get();
StaticVertexBufferInterface *staticBuffer = buffer ? buffer->getStaticVertexBuffer() : NULL;
if (staticBuffer && staticBuffer->getBufferSize() > 0 && staticBuffer->lookupAttribute(attribs[i]) == -1 &&
!directStoragePossible(staticBuffer, attribs[i]))
{
buffer->invalidateStaticData();
}
}
}
// Reserve the required space in the buffers
for (int i = 0; i < gl::MAX_VERTEX_ATTRIBS; i++)
{
if (translated[i].active && attribs[i].mArrayEnabled)
{
gl::Buffer *buffer = attribs[i].mBoundBuffer.get();
StaticVertexBufferInterface *staticBuffer = buffer ? buffer->getStaticVertexBuffer() : NULL;
VertexBufferInterface *vertexBuffer = staticBuffer ? staticBuffer : static_cast<VertexBufferInterface*>(mStreamingBuffer);
if (!directStoragePossible(vertexBuffer, attribs[i]))
{
if (staticBuffer)
{
if (staticBuffer->getBufferSize() == 0)
{
int totalCount = elementsInBuffer(attribs[i], buffer->size());
if (!staticBuffer->reserveVertexSpace(attribs[i], totalCount, 0))
{
return GL_OUT_OF_MEMORY;
}
}
}
else
{
if (!mStreamingBuffer->reserveVertexSpace(attribs[i], count, instances))
{
return GL_OUT_OF_MEMORY;
}
}
}
}
}
// Perform the vertex data translations
for (int i = 0; i < gl::MAX_VERTEX_ATTRIBS; i++)
{
if (translated[i].active)
{
if (attribs[i].mArrayEnabled)
{
gl::Buffer *buffer = attribs[i].mBoundBuffer.get();
if (!buffer && attribs[i].mPointer == NULL)
{
// This is an application error that would normally result in a crash, but we catch it and return an error
ERR("An enabled vertex array has no buffer and no pointer.");
return GL_INVALID_OPERATION;
}
StaticVertexBufferInterface *staticBuffer = buffer ? buffer->getStaticVertexBuffer() : NULL;
VertexBufferInterface *vertexBuffer = staticBuffer ? staticBuffer : static_cast<VertexBufferInterface*>(mStreamingBuffer);
BufferStorage *storage = buffer ? buffer->getStorage() : NULL;
bool directStorage = directStoragePossible(vertexBuffer, attribs[i]);
std::size_t streamOffset = -1;
unsigned int outputElementSize = 0;
if (directStorage)
{
outputElementSize = attribs[i].stride();
streamOffset = attribs[i].mOffset + outputElementSize * start;
storage->markBufferUsage();
}
else if (staticBuffer)
{
streamOffset = staticBuffer->lookupAttribute(attribs[i]);
outputElementSize = staticBuffer->getVertexBuffer()->getSpaceRequired(attribs[i], 1, 0);
if (streamOffset == -1)
{
// Convert the entire buffer
int totalCount = elementsInBuffer(attribs[i], storage->getSize());
int startIndex = attribs[i].mOffset / attribs[i].stride();
streamOffset = staticBuffer->storeVertexAttributes(attribs[i], -startIndex, totalCount, 0);
}
if (streamOffset != -1)
{
streamOffset += (attribs[i].mOffset / attribs[i].stride()) * outputElementSize;
if (instances == 0 || attribs[i].mDivisor == 0)
{
streamOffset += start * outputElementSize;
}
}
}
else
{
outputElementSize = mStreamingBuffer->getVertexBuffer()->getSpaceRequired(attribs[i], 1, 0);
streamOffset = mStreamingBuffer->storeVertexAttributes(attribs[i], start, count, instances);
}
if (streamOffset == -1)
{
return GL_OUT_OF_MEMORY;
}
translated[i].storage = directStorage ? storage : NULL;
translated[i].vertexBuffer = vertexBuffer->getVertexBuffer();
translated[i].serial = directStorage ? storage->getSerial() : vertexBuffer->getSerial();
translated[i].divisor = attribs[i].mDivisor;
translated[i].attribute = &attribs[i];
translated[i].stride = outputElementSize;
translated[i].offset = streamOffset;
}
else
{
if (!mCurrentValueBuffer[i])
{
mCurrentValueBuffer[i] = new StreamingVertexBufferInterface(mRenderer, CONSTANT_VERTEX_BUFFER_SIZE);
}
StreamingVertexBufferInterface *buffer = mCurrentValueBuffer[i];
if (mCurrentValue[i][0] != attribs[i].mCurrentValue[0] ||
mCurrentValue[i][1] != attribs[i].mCurrentValue[1] ||
mCurrentValue[i][2] != attribs[i].mCurrentValue[2] ||
mCurrentValue[i][3] != attribs[i].mCurrentValue[3])
{
unsigned int requiredSpace = sizeof(float) * 4;
if (!buffer->reserveRawDataSpace(requiredSpace))
{
return GL_OUT_OF_MEMORY;
}
int streamOffset = buffer->storeRawData(attribs[i].mCurrentValue, requiredSpace);
if (streamOffset == -1)
{
return GL_OUT_OF_MEMORY;
}
mCurrentValueOffsets[i] = streamOffset;
}
translated[i].storage = NULL;
translated[i].vertexBuffer = mCurrentValueBuffer[i]->getVertexBuffer();
translated[i].serial = mCurrentValueBuffer[i]->getSerial();
translated[i].divisor = 0;
translated[i].attribute = &attribs[i];
translated[i].stride = 0;
translated[i].offset = mCurrentValueOffsets[i];
}
}
}
for (int i = 0; i < gl::MAX_VERTEX_ATTRIBS; i++)
{
if (translated[i].active && attribs[i].mArrayEnabled)
{
gl::Buffer *buffer = attribs[i].mBoundBuffer.get();
if (buffer)
{
buffer->promoteStaticUsage(count * attribs[i].typeSize());
}
}
}
return GL_NO_ERROR;
}
