OpenGL dev for RaspberryPI

I’m trying to run PianoBooster (a game that teaches kids to play piano) on a RaspberryPi 3. It requires OpenGL (not OpenGL ES). Pianobooster works wonderfully on my AMD64 Desktop machine, and almost works perfectly my Raspberry Pi except for the rendering of the musical score. It displays a three lined score.

Please see RaspPi screen capture.
Desktop screen capture:

Interestingly the game “works” on RaspPi; however, players need to make an educated guess about what piano key needs to be played next.

I believe the problem lies in the developmental OpenGL driver for Rasp Pi, and there is little I can do but wait for further progress. But perhaps there is a coding error that needs fixing? The code can be found here:

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