Part 1: OpenGL Overlay Scaling, using GL_NEAREST

88games without proportional overlay scaling (normal)

88games with proportional overlay scaling, 1600x1200

SWAT with proportional overlay scaling, beehive overlay 1600x1200

SWAT with proportional overlay scaling, realistic-v overlay 1600x1200

A fluke? SWAT with proportional overlay scaling, realistic-v overlay 1280x1024

SWAT without proportional overlay scaling, realistic-v overlay 1280x1024 (normal)

Part 2: OpenGL Overlay Scaling, using GL_LINEAR compared to normal arcade mode using GL_NEAREST

Part 2 - Screenshots

MacMAME - Emuversal Bulletin Board