Method GetBuffer

trinity/Shader/Tr2Material.cpp:17–66

std::pair<Tr2SharedConstantBuffers::Key, Tr2ConstantBufferAL> Tr2SharedConstantBuffers::GetBuffer( const void* contents, uint32_t size )
{
	if( !size || !contents )
	{
		return std::make_pair( Key(), Tr2ConstantBufferAL() );
	}
	Key key;
	key.size = size;
	key.hash = CcpHashFNV1( contents, size );
	key.contents = contents;

	auto found = m_buffers.find( key );
	if( found != m_buffers.end() )
	{
		auto& value = found->second;
		if( !value.buffer.IsValid() )
		{
			USE_MAIN_THREAD_RENDER_CONTEXT();
			if( FAILED( value.buffer.Create( size, Tr2ConstantUsageAL::ONE_SHOT, contents, renderContext ) ) )
			{
				return std::make_pair( Key(), Tr2ConstantBufferAL() );
			}
		}
		++value.refCount;
		return std::make_pair( found->first, value.buffer );
	}

	if( size % sizeof( Vector4 ) )
	{
		size += sizeof( Vector4 ) - size % sizeof( Vector4 );
	}

	Value value;
	{
		USE_MAIN_THREAD_RENDER_CONTEXT();
		if( FAILED( value.buffer.Create( size, Tr2ConstantUsageAL::ONE_SHOT, contents, renderContext ) ) )
		{
			return std::make_pair( Key(), Tr2ConstantBufferAL() );
		}
	}

	value.refCount = 1;

	auto copy = new uint8_t[size];
	memcpy( copy, contents, size );
	key.contents = copy;

	m_buffers[key] = value;
	return std::make_pair( key, value.buffer );
}

void Tr2SharedConstantBuffers::ReleaseBuffer( const Key& key )
{