Method Update

trinity/Shader/Utils/Tr2DataTextureManager.cpp:93–164

-------------------------------------------------------------------------------- Description: Syncronous update --------------------------------------------------------------------------------

//   Syncronous update
// --------------------------------------------------------------------------------
void Tr2DataTextureManager::Update( EveUpdateContext& updateContext )
{
	USE_MAIN_THREAD_RENDER_CONTEXT();

	// 0
	m_maxPixelCount = m_maxBlockCount = 0;

	// do not update anything if data is totally empty
	if( m_blockData.empty() )
	{
		return;
	}

	// update data texture and keep track of the pixel offsets!
	void* data = nullptr;
	uint32_t pitch = 0;
	int32_t pixelOffset = 0;
	m_dataTextureOffsets.clear();
	if( SUCCEEDED( m_dataTexture->GetTexture()->MapForWriting( Tr2TextureSubresource( 0 ), data, pitch, renderContext ) ) )
	{
		uint8_t* mem = (uint8_t*)data;

		// encode all the blocks in the texture, go through them by priority
		for( auto it = m_blockPriority.rbegin(); it != m_blockPriority.rend(); ++it )
		{
			auto finder = m_blockData.find( it->second );
			if( finder != m_blockData.end() )
			{
				int32_t blockID = finder->first;
				BlockData* block = &finder->second;

				// check if we still have room for one more block
				if( pixelOffset + block->blockLength + 1 >= m_textureWidth )
				{
					break;
				}

				// save pixeloffset
				m_dataTextureOffsets[blockID] = pixelOffset;

				// header
				for( uint32_t y = 0; y < m_textureHeight; ++y )
				{
					memcpy( &mem[y * pitch], &block->header[y], sizeof( Vector4 ) );
				}

				// data
				mem += sizeof( Vector4 );
				for( uint32_t y = 0; y < m_textureHeight; ++y )
				{
					for( uint32_t x = 0; x < block->blockLength; ++x )
					{
						memcpy( &mem[y * pitch + x * sizeof( Vector4 )], &block->data[x * m_textureHeight + y], sizeof( Vector4 ) );
					}
				}

				// next
				mem += block->blockLength * sizeof( Vector4 );