Method CreateAndCopyFromRenderTarget

trinity/Resources/TriTextureRes.cpp:894–958

}

bool TriTextureRes::CreateAndCopyFromRenderTarget( Tr2RenderTarget* renderTarget )
{
	USE_MAIN_THREAD_RENDER_CONTEXT();

	DestroyOwnTexture();

	ON_BLOCK_EXIT( [&] { SetTexture( m_ownTexture ); } );

	if( !renderTarget || !renderTarget->IsValid() )
	{
		return false;
	}

	auto& rt = renderTarget->GetRenderTarget();

	auto width = rt.GetWidth();
	auto height = rt.GetHeight();

	// With mipmaps there may be staging resources involved, so just defer the problem to Tr2TextureAL::CopySubresourcRegion
	if( rt.GetMipCount() != 1 )
	{
		Tr2BitmapDimensions bd( width, height, 0, rt.GetFormat() ); // use this to compute true mipcount of new texture

		{
			USE_MAIN_THREAD_RENDER_CONTEXT();
			CR_RETURN_VAL( m_ownTexture.Create(
							   Tr2BitmapDimensions( width, height, bd.GetTrueMipCount(), rt.GetFormat() ),
							   Tr2GpuUsage::SHADER_RESOURCE | Tr2GpuUsage::COPY_DESTINATION,
							   Tr2CpuUsage::READ | Tr2CpuUsage::WRITE,
							   renderContext ),
						   false );
		}

		Tr2TextureSubresource dst;
		dst.SetRect( 0, 0, width, height );
		if( FAILED( m_ownTexture.CopySubresourceRegion( Tr2TextureSubresource(), *renderTarget, dst, renderContext ) ) )
		{
			m_ownTexture = Tr2TextureAL();
			return false;
		}
	}
	else
	{
		// No mipmaps, just locking the RT and initializing a new texture with its contents using initialData should work.
		Tr2SubresourceData srd;
		if( FAILED( rt.MapForReading( Tr2TextureSubresource( 0 ), srd.m_sysMem, srd.m_sysMemPitch, renderContext ) ) )
		{
			return false;
		}
		ON_BLOCK_EXIT( [&] { rt.UnmapForReading( renderContext ); } );

		srd.m_sysMemSlicePitch = rt.GetHeight() * srd.m_sysMemPitch;

		CR_RETURN_VAL( m_ownTexture.Create(
						   Tr2BitmapDimensions( width, height, 1, rt.GetFormat() ),
						   Tr2GpuUsage::SHADER_RESOURCE | Tr2GpuUsage::COPY_DESTINATION,
						   Tr2CpuUsage::READ,
						   &srd,