I plan to add new parameters to modeline settings to create something like letterbox image. Only 2 new parameters should be required, the number of lines to display as empty lines at top and bottom of screen.
I just committed code allowing creation of modelines with black border on top and bottom of the screen.
I also add a new 240MHz demo (puls) using such a modeline. The demo is a bit slow (~ 2 fps) because it uses a lot of floating computations and I think little teensy is a bit too underpower to perform realtime ray casting
This demo also uses a double buffering with a DMA channel copying the offscreen buffer to the frame buffer.
It is possible to activate fish eye mode by uncommenting #define FISH_EYE_LENS line.
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