#version 460
layout(triangles, equal_spacing, ccw) in;
uniform mat4 mvp;
uniform mat4 model;
in vec4 fct[];
out vec4 fca;
//in vec4 cntr[];

vec4 n4_test(vec4 p){
	vec3 offset = p.xyz;
	return vec4(normalize(offset), 1);
}

void main(){
	vec4 p = 
			gl_TessCoord.r * gl_in[0].gl_Position +
			gl_TessCoord.g * gl_in[1].gl_Position +
			gl_TessCoord.b * gl_in[2].gl_Position;

	gl_Position = mvp * n4_test(p);

	// This ONLY works because we have a sphere!
	vec3 normal = (model * p).xyz;

	// This is the diffuse color AND the ambient color
	// They don't have to be the same
	vec3 material = vec3(1, 1, 1);
	
	vec3 Direction = vec3(10, 5, 3); // Light direction
	vec3 I = vec3(1, .4, 0.4); // Light Intensity
	vec3 R = material * I * clamp(dot(normalize(Direction), normalize(normal)), 0, 1);

	vec3 Direction2 = vec3(10, -5, 3); // Light direction
	vec3 I2 = vec3(.3, .3, .9); // Light Intensity
	// If you don't use clamp, then you can do this instead
	float dp =  dot(normalize(Direction2), normalize(normal));
	if(dp < 0)
		dp = 0;
	vec3 R2 = material * I2 * dp;
	
	vec3 A = material * vec3(.1, .2, .1);
	
	fca = vec4(R2 + R + A, 1.0);
}