Add camera aperture / depth-of-field

demo.c

@@ -13,6 +13,8 @@
 #define MIN_RAD 1.0
 
 #define FOV 90
+#define APERTURE 0.5
+#define FOCAL_LEN 100.0
 #define SAMPLES_PER_PIXEL 100
 
 static const vec3_t camera_pos = { -100.0, 25.0, -100.0 };
@@ -62,7 +64,8 @@ int main()
 		rand_obj(objs + i, &rng);
 
 	img_t img = { .pix = pixbuf };
-	camera_t camera = camera_init(camera_pos, target, FOV, W, H, APERTURE);
+	camera_t camera
+	    = camera_init(camera_pos, target, FOV, W, H, APERTURE, FOCAL_LEN);
 
 	const scene_t scene = {
 		.sky_colour = sky,