#version 330 core

// material
uniform vec3 materialAmbient;
uniform vec3 materialKd;
uniform vec3 materialKs;
uniform float materialNs;

uniform vec3 dirLight[2];
uniform int nbPointLights;
uniform vec3 pointLights[8];

// fragment
in vec3 varNormal;
in vec2 varTexCoord;

in vec3 lightDirInView[5];
in vec3 halfVecInView[5];

// resultat
layout(location = 0)out vec4 outColor;

// --------------------

vec3 computeLight(in vec3 kd, in vec3 ks, in float ns, in vec3 color, in vec3 normal, in vec3 lightDir, in vec3 halfVec){
	float diffuse = 0;
	float specular = 0;

	diffuse = dot(normal, lightDir);
	diffuse = diffuse < 0 ? 0 : diffuse;
	specular = dot(halfVec, normal);
	specular = specular < 0 ? 0 : specular;

	return color*diffuse*(kd+ks*pow(specular, ns));
}

void main(void) {
	int i;
	vec3 kd = materialKd;
	vec3 light = 0.1*kd + computeLight(kd, materialKs, materialNs, dirLight[1], varNormal, lightDirInView[0], halfVecInView[0]);
	for(i=1; i<nbPointLights+1; ++i)
		light += computeLight(kd, materialKs, materialNs, pointLights[i*2 -1], varNormal, lightDirInView[i], halfVecInView[i]);

	outColor = vec4(materialAmbient + light, 1);
}