Implement RNG module

demo.c

@@ -1,6 +1,7 @@
 #include "camera.h"
 #include "ff.h"
 #include "obj.h"
+#include "rng.h"
 
 #include <unistd.h>
 
@@ -23,9 +24,13 @@ static pix_t pixbuf[W * H];
 
 int main()
 {
+	rng_init();
+
 	img_t img = { .pix = pixbuf };
 	camera_t camera = camera_init(camera_pos, FOCAL_LEN, VIEWPORT_H, W, H);
 	camera_render(&camera, scene, NELEMS(scene), &img);
+
 	ff_write(STDOUT_FILENO, img);
+
 	return 0;
 }