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index.html
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<!DOCTYPE html>
<html>
<!-- this file is public domain -->
<head>
<title>Subdivision Surfaces WebGL</title>
<style>
body, html {
margin: 0px;
width: 100%;
height: 100%;
overflow: hidden;
}
#canvas3d {
width: 100%;
height: 100%;
position: absolute;
background-color: rgba(255, 255, 255, 0);
opacity: 1.0;
}
</style>
<script id="ss_vshader" type="x-shader/x-vertex">
precision mediump float;
uniform mat4 projectionMatrix;
uniform mat4 normalMatrix;
uniform mat4 modelMatrix;
uniform float steps;
uniform float patch1;
uniform float data_size;
uniform vec3 lightDir1;
uniform vec4 face_color;
uniform sampler2D sampler2d;
uniform sampler2D util_sampler2d;
attribute vec2 position;
varying vec4 vColor;
varying vec4 vNormal;
varying vec4 vWorld;
vec3 get_patch1_point(float f, float fx, float fy)
{
float c; float ds;
ds = 0.0; //(0.5 / data_size);
c = floor(4.0*4.0*3.0*f + fy*4.0*3.0 + fx*3.0);
float cy1 = floor(c/data_size)+0.0001;
float cx1 = mod(c, data_size)+0.0001;
float cy2 = floor((c+1.0)/data_size)+0.0001;
float cx2 = mod(c+1.0, data_size)+0.0001;
float cy3 = floor((c+2.0)/data_size)+0.0001;
float cx3 = mod(c+2.0, data_size)+0.0001;
cx1 += ds; cy1 += ds; cx2 += ds; cy2 += ds;
cx3 += ds; cy3 += ds;
cx1 /= data_size; cx2 /= data_size; cx3 /= data_size;
cy1 /= data_size; cy2 /= data_size; cy3 /= data_size;
return vec3(texture2D(sampler2d, vec2(cx1, cy1))[3],
texture2D(sampler2d, vec2(cx2, cy2))[3],
texture2D(sampler2d, vec2(cx3, cy3))[3]);
}
float ptab(float i)
{
if (abs(i) < 0.01) return 1.0;
else if (abs(i-1.0) < 0.01) return 3.0;
else if (abs(i-2.0) < 0.01) return 3.0;
else return 1.0;
}
vec4 eval(float f, float u, float v)
{
vec3 p = vec3(0.0, 0.0, 0.0);
float bi; float bj;
vec3 c;
float di=0.0; float dj=0.0;
vec3 du, dv;
//optimized evaluation code, disabled by default due to firefox problems
/*
vec3 p00 = get_patch1_point(f, 0.0, 0.0);
vec3 p01 = get_patch1_point(f, 0.0, 1.0);
vec3 p02 = get_patch1_point(f, 0.0, 2.0);
vec3 p03 = get_patch1_point(f, 0.0, 3.0);
vec3 p10 = get_patch1_point(f, 1.0, 0.0);
vec3 p11 = get_patch1_point(f, 1.0, 1.0);
vec3 p12 = get_patch1_point(f, 1.0, 2.0);
vec3 p13 = get_patch1_point(f, 1.0, 3.0);
vec3 p20 = get_patch1_point(f, 2.0, 0.0);
vec3 p21 = get_patch1_point(f, 2.0, 1.0);
vec3 p22 = get_patch1_point(f, 2.0, 2.0);
vec3 p23 = get_patch1_point(f, 2.0, 3.0);
vec3 p30 = get_patch1_point(f, 3.0, 0.0);
vec3 p31 = get_patch1_point(f, 3.0, 1.0);
vec3 p32 = get_patch1_point(f, 3.0, 2.0);
vec3 p33 = get_patch1_point(f, 3.0, 3.0);
float u2=u*u, u3=u2*u, v2=v*v, v3=v2*v;
float u1 = u-1.0, v1 = v-1.0;
//evaluation equation optimized with REDUCE
for (int i=0; i<3; i++) {
p[i] = (((((u1*p00[i]-3.0*p10[i]*u)*u1+3.0*p20[i]*u2)*u1-
p30[i]*u3)*v1-3.0*(((u1*p01[i]-3.0*p11[i]*u)*u1+3.0*
p21[i]*u2)*u1-p31[i]*u3)*v)*v1+3.0*(((u1*p02[i]-3.0*
p12[i]*u)*u1+3.0*p22[i]*u2)*u1-p32[i]*u3)*v2)*v1-
(((u1*p03[i]-3.0*p13[i]*u)*u1+3.0*p23[i]*u2)*u1-p33[i]*
u3)*v3;
}
// */
/*original patch evaluation, based off of Wikipedia article*/
for (int i=0; i<4; i++) {
dj = 0.0;
for (int j=0; j<4; j++) {
bi = ptab(di)*pow(u, di)*pow(1.0-u, 3.0-di);
bj = ptab(dj)*pow(v, dj)*pow(1.0-v, 3.0-dj);
c = get_patch1_point(f, di, dj);
p[0] += c[0]*bi*bj;
p[1] += c[1]*bi*bj;
p[2] += c[2]*bi*bj;
dj += 1.0;
}
di += 1.0;
}
return vec4(p[0], p[1], p[2], 1.0);
}
//factorial(3-i)
float ntab1(float i)
{
if (abs(i) < 0.01) return 36.0;
else if (abs(i-1.0) < 0.01) return 12.0;
else if (abs(i-2.0) < 0.01) return 6.0;
else return 6.0;
}
//factorial(i)
float ntab2(float i)
{
if (abs(i) < 0.01) return 1.0;
else if (abs(i-1.0) < 0.01) return 1.0;
else if (abs(i-2.0) < 0.01) return 2.0;
else return 6.0;
}
vec4 normal(float f, vec4 pos, float u, float v)
{
u = clamp(u, 0.01, 0.99);
v = clamp(v, 0.01, 0.99);
float du = 0.001;
float dv = 0.001;
if (u > 0.5) du = -du;
if (v > 0.5) dv = -dv;
vec3 p = pos.xyz;
vec3 p1 = eval(f, u+du, v).xyz - p;
vec3 p2 = eval(f, u, v+dv).xyz - p;
if (u > 0.5)
p1 = -p1;
if (v > 0.5)
p2 = -p2;
vec3 n = normalize(cross(p1, p2));
return vec4(n[0], n[1], n[2], 1.0);
}
void main()
{
float eps1 = 0.9999;
float eps2 = 0.00005;
vec4 pos = eval(patch1, abs(position[0]*eps1+eps2), abs(position[1]*eps1+eps2));
vec4 normal1 = normal(patch1, pos, position[0], position[1]);
vec4 transNormal = normalMatrix * vec4(normal1.xyz, 1.0);
gl_Position = projectionMatrix * pos;
gl_PointSize = 9.0;
vColor = face_color;
vNormal = vec4(normalize(transNormal.xyz), 1.0);
vWorld = pos;
}
</script>
<script id="simple_vshader" type="x-shader/x-vertex">
precision mediump float;
uniform mat4 projectionMatrix;
uniform mat4 modelMatrix;
uniform mat4 normalMatrix;
attribute vec4 position;
attribute vec4 color;
attribute vec4 normal;
varying vec4 vColor;
varying vec4 vNormal;
varying vec4 vWorld;
void main() {
gl_Position = projectionMatrix * position;
vColor = color;
vNormal = normalMatrix * normal;
vWorld = position;
}
</script>
<script id="simple_fshader" type="x-shader/x-fragment">
precision mediump float;
uniform mat4 projectionMatrix;
uniform mat4 modelMatrix;
uniform mat4 normalMatrix;
varying vec4 vColor;
varying vec4 vNormal;
varying vec4 vWorld;
void main() {
vec4 color = vColor;
vec3 light = vec4(0.0, 0.0, 1.0, 1.0).xyz;
light = normalize(light);
vec3 normal = normalize(vNormal.xyz);
float d = abs(dot(normal, light.xyz));
gl_FragColor = vec4(color.xyz*d, color[3]);
}
</script>
<script id="flat_vshader" type="x-shader/x-vertex">
precision mediump float;
uniform mat4 projectionMatrix;
uniform mat4 modelMatrix;
uniform mat4 normalMatrix;
attribute vec4 position;
attribute vec4 color;
varying vec4 vColor;
varying vec4 vWorld;
void main() {
gl_Position = projectionMatrix * position;
vColor = color;
vWorld = position;
}
</script>
<script id="flat_fshader" type="x-shader/x-fragment">
precision mediump float;
uniform mat4 projectionMatrix;
uniform mat4 modelMatrix;
uniform mat4 normalMatrix;
varying vec4 vColor;
void main() {
vec4 color = vColor;
gl_FragColor = color;
}
</script>
<script data-main="scripts/app" src="scripts/require.js"></script>
</head>
<body>
<canvas id="canvas3d">
</canvas>
</html>