Hi all, I'm working on the GUI aspect of my DX9 un-managed C++ project. I've rendered my GUI to a surface, created like this: g_pD3DDevice->CreateRenderTarget(RESX,RESY,D3DFMT_X8R8G8B8, D3DMULTISAMPLE_NONE,0,FALSE,&g_GUISurface,NULL); I'm trying to copy it to the backbuffer with transparency (so the 3D stuff underneath is visible), but no matter what i try it doesn't work. I've tried using UpdateSurface (with the GUISurface, and backbuffer) and creating a texture from my render target, then drawing a textured quad but nothing i try works. I've tried searching but i keep getting threads suggesting the above, but i just can't get it to work. :( Any help would be much appreciated. Edited by Coder: Wide line break [Edited by - Coder on September 12, 2004 11:25:41 PM]

Thanks for your very quick response.

I've now changed my format from x8r8g8b8 to A2R10G10G10, but now my app crashes when trying to create a device.
I also tried changing the backbuffer's AutoDepthStencilFormat to D3DFMT_D16, but that didn't work either. :(

I am running in 32bit display mode now, so i know my graphics card (geforce3) can handle that.

Thanks a lot for your help, i've got it working now. I'll take a look at debugging now. Cheers!