// Copyright (C) 2007 Dave Griffiths
// Licence: GPLv2 (see COPYING)
// Fluxus Shader Library
// ---------------------
// BadPrint NPR Shader
// This shader tries to emulate the effect
// of a bad printing process. Can be controlled
// with different settings for RGB

uniform vec3 Scale;
uniform vec3 Offset;
uniform vec3 Register;
uniform vec3 Size;

varying vec3 N;
varying vec3 P;
varying vec4 S;
varying vec3 L;

void main()
{ 
    vec3 l = normalize(L);
    vec3 n = normalize(N);
    vec2 p = S.xy/S.w;

    vec2 sr = p*Size.r+Register.r;
    vec2 sg = p*Size.g+Register.g;
    vec2 sb = p*Size.b+Register.b;

    float diffuse = dot(l,n);
    
    float r = (sin(sr.x)+cos(sr.y))*Scale.r+Offset.r+diffuse;
    float g = (sin(sg.x)+cos(sg.y))*Scale.g+Offset.g+diffuse;
    float b = (sin(sb.x)+cos(sb.y))*Scale.b+Offset.b+diffuse;
 
    gl_FragColor = vec4(step(0.5,r),step(0.5,g),step(0.5,b),1);
}