Hue / refraction code

gistfile1.txt

void main() 
{
	const int steps = 10;

	float max_hue = rgb2hsv(vec3(1.0, 0.0, 1.0)).x;
	float min_hue = rgb2hsv(vec3(1.0, 0.0, 0.0)).x;

	const float max_eta = 0.9;
	const float min_eta = 0.6;

	float hue_diff = max_hue - min_hue;
	const float hue_step_size = hue_diff / (steps - 1);

	float eta_diff = max_eta - min_eta;
	const float eta_step_size = eta_diff / (steps - 1);

	float curr_hue = min_hue;
	float curr_eta = min_eta;

	vec3 color = vec3(0.0);

	for(int i = 0; i < steps; i++, curr_hue += hue_step_size, curr_eta += eta_step_size)
	{
		const float f = get_ray0(curr_hue, curr_eta);
	
		vec3 mask = hsv2rgb(vec3(curr_hue, 1.0, 1.0));

		color.r += f*mask.r;
		color.g += f*mask.g;
		color.b += f*mask.b;	
	}

	color /= steps;

	imageStore(color_image, pixel_pos, vec4(color, 0.0));
}