phong-multi.frag

varying vec4 diffuse, ambientGlobal, ambient;
varying vec3 normal, lightDir, halfVector;
varying float dist;

uniform sampler2D tex0;

vec4 calcPointLight(){
    float d = length(lightDir);
    float att = 1.0 / ( gl_LightSource[0].constantAttenuation + (gl_LightSource[0].linearAttenuation*d) + (gl_LightSource[0].quadraticAttenuation*d*d) );

    vec4 color  = (gl_FrontLightModelProduct.sceneColor * gl_FrontMaterial.ambient)  +(gl_LightSource[0].ambient * gl_FrontMaterial.ambient * att);
    vec3 N = normalize(normal);
    vec3 L = normalize(lightDir);
    float lambertTerm = dot(N,L);

    if(lambertTerm > 0.0)
    {
        color += gl_LightSource[0].diffuse * gl_FrontMaterial.diffuse * lambertTerm * att;
        vec3 E = normalize(halfVector);
        vec3 R = reflect(-L, N);
        float specular = pow( max(dot(R, E), 0.0), gl_FrontMaterial.shininess );
        color += gl_LightSource[0].specular * gl_FrontMaterial.specular * specular * att;
    }

    return color;
}

void main()
{
    vec4 phong = calcPointLight();

    gl_FragData[0] = phong * texture2D(tex0, gl_TexCoord[0].st);  // ha ki kellene kapcsolni a texturat, a motor lecsereli azt egy ures feher texturara.
    gl_FragData[1] = vec4(normal,1.0); //ezt nem igy kellene
}