~pbatch/sdf2d

2d SDF shader functions by Inigo Quilez, ported to C 
-lm
vmdemo cleanup
sdfvm initial implementation with demo

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#sdf2d

Various 2d shapes with rainbow colors arranged in a grid

Tiny Rainbow Shapes Sprinkled On a Canvas

2d SDF shader functions by Inigo Quilez, ported to C.

https://iquilezles.org/articles/distfunctions2d/

To build, run "make", then "./demo" to run the demo.

The demo will produce 2 PPM files: "demo.ppm" and "sprinkles.ppm".