ADSPhong.fp

// ADS Point lighting Shader
// Fragment Shader
#version 330

out vec4 vFragColor;

uniform vec4 ambientColor;
uniform vec4 diffuseColor;   
uniform vec4 specularColor;

smooth in vec3 vVaryingNormal;
smooth in vec3 vVaryingLightDir;

void main(void)
{ 
    float diff = max(0.0, dot(normalize(vVaryingNormal), normalize(vVaryingLightDir)));

    vFragColor = diff * diffuseColor;

    vFragColor += ambientColor;

	if (diff > 0)
	{
		vec3 vReflection = normalize(reflect(-normalize(vVaryingLightDir), normalize(vVaryingNormal)));
		float spec = max(0.0, dot(normalize(vVaryingNormal), vReflection));

		float fSpec = pow(spec, 128.0);
		vFragColor.rgb += vec3(fSpec, fSpec, fSpec);
	}
}