#version 400 core
uniform vec3 lDirection;

in vec3 fPosition;
in vec3 fNormal;
in vec4 ifColor;

out vec4 fColor;

void
main()
{
	// Get lighting vectors
	vec3 LightDirection = normalize(vec3(0, 1, 0));	// We assume light is at camera position
	vec3 nfNormal = normalize(fNormal);
	vec3 nviewDirection = normalize(fPosition);

	// Compute diffuse component
	float diffuse = max(0.0, dot(nfNormal, LightDirection));

	// Compute specular component
	vec3 Rl = normalize(-LightDirection+2.0*nfNormal*dot(nfNormal,LightDirection));
	float specular = 0.1*pow(max(0.0, dot(Rl, nviewDirection)), 16);

	// Fragment color (currently static, to be replaced with texture)
	vec3 color = ifColor.xyz;

	// Compute final color
	fColor = vec4(color * (0.1 + diffuse +  specular), 1);
//	fColor = vec4(fNormal, 1);
}