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sndshooter is a (proof-of-concept) raycasted 3D engine that renders the player view as sound, thus allowing the world to be navigated without having to see the screen.
It works by mapping the different "pixels" of the screen to different frequencies, the center being at 200 Hz with the frequency being multiplied by 1.15 for each pixel further away. Pixels to the left of the center are sent to the left channel, to the right are sent to the right channel.
It could probably be made more usable by tweaking the parameters that go in the sound rendering.
The only dependencies are SDL2 and a D compiler.