Bug with screenRect vs bufferSize

[clobber]

Currently both screenRect and bufferSize need to match up otherwise you'll get some distortion: http://cl.ly/image/0u1b0P2C0v39

For example, a "match" being OESizeMake(GPU_DISPLAY_WIDTH, GPU_DISPLAY_HEIGHT * 2) for the buffer and OERectMake(0, 0, GPU_DISPLAY_WIDTH, GPU_DISPLAY_HEIGHT * 2) for the screen.

Changing screenRect to OERectMake(0, 0, GPU_DISPLAY_WIDTH, GPU_DISPLAY_HEIGHT) will cause the wrong aspect ratio as seen in the screenshot above.

We should be able to change screenRect without having to adjust bufferSize. With git bisect I tracked down the problem to this commit which coincidentally was also to correct aspect ratio issues with resolution switching: 14a7279

[clobber]

Fixed here 0c58f6f