Made pixel upload alignment work as a calculation based on the pitch.  This seems to fix the odd alignment issues that have appeared since forever.
Made pixel upload alignment work as a calculation based on the pitch.  This seems to fix the odd alignment issues that have appeared since forever.

ademuri/sdl-gpu,Helios-vmg/sdl-gpu,grimfang4/sdl-gpu,Helios-vmg/sdl-gpu,ademuri/sdl-gpu,Helios-vmg/sdl-gpu,grimfang4/sdl-gpu,Helios-vmg/sdl-gpu,ademuri/sdl-gpu,masonwheeler/sdl-gpu,ademuri/sdl-gpu,masonwheeler/sdl-gpu,masonwheeler/sdl-gpu,masonwheeler/sdl-gpu,grimfang4/sdl-gpu,grimfang4/sdl-gpu