Gamma correction

examples/test/shaders/test.frag

@@ -96,5 +96,8 @@ void main() {
 	// color = colormap(iters/MAX_STEPS+0.5);
 	vec3 p = eye + dir * depth; // recast the ray
 	color = shade(p, mat_idx);
+
+    // gamma
+    color = vec4(pow(clamp(color.xyz, 0.0, 1.0), vec3(0.4545)), 1.0);
 }