Method UpdateSubresource

trinityal/dx12/Tr2TextureALDx12.cpp:1566–1621

}

ALResult Tr2TextureAL::UpdateSubresource( const Tr2TextureSubresource& region, const void* source, uint32_t pitch, uint32_t depthPitch, Tr2RenderContextAL& renderContext )
{
	if( !IsValid() )
	{
		return E_INVALIDCALL;
	}
	if( !renderContext.IsValid() )
	{
		return E_INVALIDARG;
	}

	if( HasFlag( m_cpuUsage, Tr2CpuUsage::WRITE_OFTEN ) )
	{
		return E_INVALIDCALL;
	}
	if( !HasFlag( m_cpuUsage, Tr2CpuUsage::WRITE ) && !IsWritable( m_gpuUsage ) )
	{
		return E_INVALIDCALL;
	}

	if( !region.IsValidForBitmap( m_desc ) )
	{
		return E_INVALIDARG;
	}
	if( !region.IsSingleSubresource() )
	{
		return E_INVALIDARG;
	}

	void* dest;
	uint32_t destPitch;
	FORWARD_HR( MapForWriting( region, dest, destPitch, renderContext ) );

	auto clamped = region;
	clamped.ClampToTexture( m_desc );

	auto bpp = Tr2RenderContextEnum::GetBytesPerPixel( m_desc.GetFormat() );
	auto width = clamped.m_box.GetWidth();
	width *= bpp;
	auto depthSlice = static_cast<const uint8_t*>( source );

	for( uint32_t j = clamped.m_box.front; j != clamped.m_box.back; ++j )
	{
		auto src = depthSlice;
		for( uint32_t i = clamped.m_box.top; i != clamped.m_box.bottom; ++i )
		{
			memcpy( dest, src, width );
			dest = static_cast<uint8_t*>( dest ) + destPitch;
			src += pitch;
		}
		depthSlice += depthPitch;
	}
	UnmapForWriting( renderContext );

	return S_OK;
}