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How to make OpenGL render to fb2 instead of fb0?

Dehuan Xin94
Intellectual 520 points
Other Parts Discussed in Thread: DM3730

I'm running DVSDK 4.03 on a DM3730 processor.

Currently application written in Qt runs on FB2 and OpenGL graphics renders to FB0. The blending of the two is done by setting key color in FB2 and setting DSS to "Normal" mode.

However, this approach does not offer satisfactory quality, and I'm trying to change DSS to "Alpha" mode.

When I do this, FB0 is then on top of FB1/2 and the final alpha is controlled by FB2, causing the OpenGL graphics covers Qt layer completely.

Question: is there a way to make GPU to render OpenGL graphics to FB2 as background, so that I can run Qt application in FB0 with UI widgets covering it?