Add fuzz parameter to reflective material

include/material.h

@@ -10,10 +10,10 @@
 		.params = { .lambertian = { .albedo = { r, g, b } } }, \
 	}
 
-#define REFLECTIVE(r, g, b) \
+#define REFLECTIVE(r, g, b, f) \
 	{ \
 		.scatter = scatter_reflective, \
-		.params = { .reflective = { .tint = { r, g, b } } }, \
+		.params = { .reflective = { .tint = { r, g, b }, .fuzz = f } }, \
 	}
 
 #define DIELECTRIC(e) \
@@ -34,6 +34,7 @@ typedef struct {
 
 typedef struct {
 	vec3_t tint;
+	double fuzz;
 } reflective_params_t;
 
 typedef struct {