PSP: Flickering problem fix
|Reported by:||bluddy||Owned by:||joostp|
Sometimes Scummvm exhibited weird graphical artifacts like flickering or stretching of the image. This was a result (I believe) of reuse of vertex arrays in the PSP GU code. I separated the vertex arrays which seems to have taken care of the issue. In addition, I removed the seemingly unnecessary call to Cache Flush which is expensive, and converted some of the double constants to float which saves a few precious cycles :)
Ticket imported from: #2863653. Ticket imported from: patches/1192.