Add camera aperture / depth-of-field

include/camera.h

@@ -8,11 +8,13 @@
 typedef struct {
 	vec3_t pos;
 	vec3_t pix_origin, x_step, y_step;
+	vec3_t u_hat, v_hat;
 	uint32_t img_width, img_height;
+	double aperture;
 } camera_t;
 
 camera_t camera_init(
     vec3_t pos, vec3_t target, double fov, uint32_t img_width,
-    uint32_t img_height);
+    uint32_t img_height, double aperture, double focal_len);
 
 #endif