#version 330 core

uniform mat4 mWorld;
uniform mat4 mView;
uniform mat4 mProjection;
uniform vec3 vEye;

layout (location = 0) in vec3 position;
layout (location = 1) in vec3 normal;

smooth out vec3 color;

vec3 hsv_to_rgb(float h, float s, float v)
{
	float c = v * s;
	h = mod((h * 6.0), 6.0);
	float x = c * (1.0 - abs(mod(h, 2.0) - 1.0));
	vec3 color;

	if (0.0 <= h && h < 1.0) {
		color = vec3(c, x, 0.0);
	} else if (1.0 <= h && h < 2.0) {
		color = vec3(x, c, 0.0);
	} else if (2.0 <= h && h < 3.0) {
		color = vec3(0.0, c, x);
	} else if (3.0 <= h && h < 4.0) {
		color = vec3(0.0, x, c);
	} else if (4.0 <= h && h < 5.0) {
		color = vec3(x, 0.0, c);
	} else if (5.0 <= h && h < 6.0) {
		color = vec3(c, 0.0, x);
	} else {
		color = vec3(0.0, 0.0, 0.0);
	}

	color.rgb += v - c;

	return color;
}

void main () {
	gl_Position = mProjection*mView*mWorld*vec4(position, 1.0);

    vec3 materialColor = hsv_to_rgb(position.z, 1, 1);
	float brightness = clamp(dot(normalize(normal), normalize(vEye)), 0.4, 0.6);
	color = materialColor*brightness;
}