///////////////////////////////////////////////////////////////////////////////
// Allocate: try to allocate a buffer of given number of vertices (each of
// given size), with the given type, and using the given texture - return null
// if no free chunks available
CVertexBuffer::VBChunk* CVertexBufferManager::Allocate(size_t vertexSize, size_t numVertices, GLenum usage, GLenum target, void* backingStore)
{
CVertexBuffer::VBChunk* result=0;
ENSURE(usage == GL_STREAM_DRAW || usage == GL_STATIC_DRAW || usage == GL_DYNAMIC_DRAW);
ENSURE(target == GL_ARRAY_BUFFER || target == GL_ELEMENT_ARRAY_BUFFER);
if (CVertexBuffer::UseStreaming(usage))
ENSURE(backingStore != NULL);
// TODO, RC - run some sanity checks on allocation request
typedef std::list<CVertexBuffer*>::iterator Iter;
#if DUMP_VB_STATS
debug_printf("\n============================\n# allocate vsize=%d nverts=%d\n\n", vertexSize, numVertices);
for (Iter iter = m_Buffers.begin(); iter != m_Buffers.end(); ++iter) {
CVertexBuffer* buffer = *iter;
if (buffer->CompatibleVertexType(vertexSize, usage, target))
{
debug_printf("%p\n", buffer);
buffer->DumpStatus();
}
}
#endif
// iterate through all existing buffers testing for one that'll
// satisfy the allocation
for (Iter iter = m_Buffers.begin(); iter != m_Buffers.end(); ++iter) {
CVertexBuffer* buffer = *iter;
result = buffer->Allocate(vertexSize, numVertices, usage, target, backingStore);
if (result)
return result;
}
// got this far; need to allocate a new buffer
CVertexBuffer* buffer = new CVertexBuffer(vertexSize, usage, target);
m_Buffers.push_front(buffer);
result = buffer->Allocate(vertexSize, numVertices, usage, target, backingStore);
if (!result)
{
LOGERROR("Failed to create VBOs (%lu*%lu)", (unsigned long)vertexSize, (unsigned long)numVertices);
}
return result;
}
