Pool

#ifdef GL_ES
  precision mediump float;
#endif

uniform vec3 lightWorldPosition;
  uniform vec3 eyeWorldPosition;
  uniform float factor;
  uniform float shadowOn;

uniform sampler2D textureSampler;

uniform vec2 ballCenter;

varying vec4 vposition;
  varying vec4 vobjectPosition;
  varying vec3 vworldPosition;
  varying vec4 vscreenPosition;
  varying vec3 vnormal;

vec4 roomColor(vec3 p, vec3 r) {
    vec2 c = vec2(1.0 / 15.0, 1.0 / 30.0) *
        (p.xy + r.xy * (lightWorldPosition.z - p.z) / r.z);

float temp = (abs(c.x + c.y) + abs(c.y - c.x));
    float t = min(0.15 * max(7.0 - temp, 0.0) +
              ((temp < 5.0) ? 1.0 : 0.0), 1.0);
    return vec4(t, t, t, 1.0);
  }

vec4 lighting(vec4 pigment, float shininess) {
    vec3 p = vworldPosition;
    vec3 l = normalize(lightWorldPosition - p);  // Toward light.
    vec3 n = normalize(vnormal);                 // Normal.
    vec3 v = normalize(eyeWorldPosition - p);    // Toward eye.
    vec3 r = normalize(-reflect(v, n));          // Reflection of v across n.

return vec4(max(dot(l, n), 0.0) * pigment.xyz +
        0.2 * pow(max(dot(l, r), 0.0), shininess) * vec3(1, 1, 1), 1.0);
  }

vec4 woodPigment(vec3 p) {
    vec3 core = normalize(
        (abs(p.y) > abs(p.x) + 1.0) ?
            vec3(1.0, 0.2, 0.3) : vec3(0.2, 1.0, 0.3));
    float grainThickness = 0.02;
    float t =
        mod(length(p - dot(p,core)*core), grainThickness) / grainThickness;

return mix(vec4(0.15, 0.05, 0.0, 0.1), vec4(0.1, 0.0, 0.0, 0.1), t);
  }

vec4 feltPigment(vec3 p) {
    return vec4(0.1, 0.45, 0.15, 1.0);
  }

vec4 environmentColor(vec3 p, vec3 r) {
    vec4 upColor = 0.1 * roomColor(p, r);
    vec4 downColor = -r.z * 0.3 * feltPigment(p);
    float t = smoothstep(0.0, 0.05, r.z);
    return mix(downColor, upColor, t);
  }

vec4 solidPixelShader() {
    return vec4(1.0, 1.0, 1.0, 0.2);
  }

vec4 feltPixelShader() {
    vec2 tex = vscreenPosition.xy / vscreenPosition.w;

vec3 p = factor * vworldPosition;
    vec3 c = factor * eyeWorldPosition.xyz;
    float width = 0.3;
    float height = 0.3;
    float d =
        1.0 * (smoothstep(1.0 - width, 1.0 + width, abs(p.x)) +
               smoothstep(2.0 - height, 2.0 + height, abs(p.y)));
    p = vworldPosition;

return (1.0 - texture2D(textureSampler, tex).x - d) *
        lighting(feltPigment(p), 4.0);
  }

vec4 woodPixelShader() {
    vec3 p = factor * vworldPosition;
    return lighting(woodPigment(p), 50.0);
  }

vec4 cushionPixelShader() {
    vec3 p = factor * vworldPosition;
    return lighting(feltPigment(p), 4.0);
  }

vec4 billiardPixelShader() {
    vec3 p = factor * vworldPosition;
    return lighting(vec4(0.5, 0.5, 0.2, 1), 30.0);
  }

vec4 ballPixelShader() {
    vec3 p = normalize(vobjectPosition.xyz);
    vec4 u = 0.5 * vec4(p.x, p.y, p.x, -p.y);
    u = clamp(u, -0.45, 0.45);
    u += vec4(0.5, 0.5, 0.5, 0.5);

float t = clamp(5.0 * p.z, 0.0, 1.0);

p = vworldPosition;
    vec3 l = normalize(lightWorldPosition - p); // Toward light.
    vec3 n = normalize(vnormal);                // Normal.
    vec3 v = normalize(eyeWorldPosition - p);   // Toward eye.
    vec3 r = normalize(-reflect(v, n));         // Reflection of v across n.

vec4 pigment =
        mix(texture2D(textureSampler, u.zw),
            texture2D(textureSampler, u.xy), t);

return 0.4 * environmentColor(p, r) +
        pigment * (0.3 * smoothstep(0.0, 1.1, dot(n, l)) +
                   0.3 * (p.z + 1.0));
  }

vec4 shadowPlanePixelShader() {
    vec2 p = vworldPosition.xy - ballCenter;
    vec2 q = (vworldPosition.xy / lightWorldPosition.z);

vec2 offset = (1.0 - 1.0 / (vec2(1.0, 1.0) + abs(q))) * sign(q);
    float t = mix(smoothstep(0.9, 0.0, length(p - length(p) * offset) / 2.0),
                  smoothstep(1.0, 0.0, length(p) / 10.0), 0.15);
    return shadowOn * vec4(t, t, t, t);
  }

Click and drag to move the view.	spacebar : Hold down to shoot.	t : Table view mode.	* : Rack for 8-Ball.
+/- : Zoom in / out.	asdw : Position the cue ball.	c : Cue ball view mode.	( : Rack for 9-Ball.