Add instructions to README.md

README.md

@@ -8,3 +8,33 @@ A jelly-like ball bounces around.
 |
 [Slides](https://tobast.fr/m2/graphics/jelly.pdf)
 
+## Compiling
+
+The basic compilation is achieved by a simple `make`.
+
+You can add additional compilation flags with `ADD_FLAGS="..." make`.
+
+The produced binary is `./bounce.bin`
+
+## Compilation flags
+
+* `-DDEBUG_DISPLAY_WIREFRAME`: display the wireframe of meshes
+* `-DDEBUG_DISPLAY_NORMAL`: display the computed normal vectors for each
+  vertice
+* `-DMC_SHOW_PERF`: display Marching Cubes performance stats
+
+## Run flags
+
+* `-perlin`: replace flat ground by perlin noise
+* `-qwerty`, `-azerty`: change the used keymap
+
+For instance, `./bounce.bin -perlin -qwerty` will use perlin floor and a qwerty
+keymap.
+
+## In-app commands
+
+* space: play/pause
+* <, >: slow down/speed up animation
+* 0: reset to default speed
+* w, a, s, d (z, q, s, d in azerty): move camera
+* q, e (a, e in azerty): rotate camera around y axis