Add enviromental samples per pixel

color.hpp

@@ -1,18 +1,27 @@
 #ifndef COLOR_H
 #define COLOR_H
 
-#include "vec3.hpp"
-
 #include <stdio.h>
 #include <stdint.h>
 
+#include "rtweekend.hpp"
+
 /* Writes color components as a space-delimited string of numbers in the range [0,255] */
-void write_color(FILE *fp, color c)
+void write_color(FILE *fp, color c, uint32_t samples_per_pixel)
 {
-    fprintf(fp, "%d %d %d\n",
-            (uint8_t) (255 * c.x),
-            (uint8_t) (255 * c.y),
-            (uint8_t) (255 * c.z));
+    double scale = 1.0 / samples_per_pixel;
+
+    // Divide the color by the number of samples
+    double r = c.x * scale;
+    double g = c.y * scale;
+    double b = c.z * scale;
+
+    /* Write output */
+    fprintf(fp,
+            "%d %d %d\n",
+            (uint8_t) (255 * clamp(r, 0, 1)),
+            (uint8_t) (255 * clamp(g, 0, 1)),
+            (uint8_t) (255 * clamp(b, 0, 1)));
 }
 
 #endif