cartoon.frag

varying float intensity;

uniform float threshold1, threshold2, threshold3;
uniform vec4 color1, color2, color3, color4;

void main()
{
    if(intensity > threshold1) {
	gl_FragColor = color1;
    } else if (intensity > threshold2) {
	gl_FragColor = color2;
    } else if(intensity > threshold3) {
	gl_FragColor = color3;
    } else {
	gl_FragColor = color4;
    }
}