#version 430 core

uniform vec3 color;
uniform vec3 lightDir;
uniform vec3 lightColor;
uniform vec3 cameraPos;

uniform float time;

in vec3 vertexNormalOut;
in vec3 vertexPosOut;
out vec4 outColor;

void main()
{
	vec3 normalizedVertexNormal = normalize(vertexNormalOut);
	float intensity = dot(normalizedVertexNormal, -lightDir);
	intensity  = max(intensity, 0.0);
	
	vec3 viewDir = normalize(cameraPos - vertexPosOut);
	vec3 reflectDir = reflect(lightDir, normalizedVertexNormal);
	
	float glossPow = 8;
	float specular = pow(max(dot(viewDir, reflectDir), 0.0), glossPow);

	float diffuse = intensity;
	outColor = vec4(lightColor * (color * diffuse + specular ), 1.0);
}