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tetrix.html
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<!DOCTYPE html>
<html>
<head>
<script id="vertex-shader" type="x-shader/x-vertex">
attribute vec4 vPosition;
attribute vec4 vColor;
varying vec4 fColor;
uniform vec3 theta;
void
main()
{
vec3 angles = radians(theta);
vec3 c = cos(angles);
vec3 s = sin(angles);
//column major matrices
mat4 rx = mat4(1.0, 0.0, 0.0, 0.0,
0.0, c.x, s.x, 0.0,
0.0, -s.x, c.x, 0.0,
0.0, 0.0, 0.0, 1.0);
mat4 ry = mat4(c.y, 0.0, -s.y, 0.0,
0.0, 1.0, 0.0, 0.0,
s.y, 0.0, c.y, 0.0,
0.0, 0.0, 0.0, 1.0);
mat4 rz = mat4(c.z, -s.z, 0.0, 0.0,
s.z, c.z, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0);
gl_Position = rz * ry * rx * vPosition;
fColor = vColor;
}
</script>
<script id="fragment-shader" type="x-shader/x-fragment">
precision mediump float;
varying vec4 fColor;
void
main()
{
gl_FragColor = fColor;
}
</script>
<script type="text/javascript" src="https://www.cs.unm.edu/~angel/WebGL/Common/webgl-utils.js"></script>
<script type="text/javascript" src="https://www.cs.unm.edu/~angel/WebGL/Common/initShaders.js"></script>
<script type="text/javascript" src="https://www.cs.unm.edu/~angel/WebGL/Common/MV.js"></script>
<script type="text/javascript" src="tetrix.js"></script>
</head>
<body>
<div>
recursive steps 0 <input id="slider" type="range"
min="0" max="8" step="1" value="0" />
8
</div>
<canvas id="gl-canvas" width="512" height="512">
Oops ... your browser doesn't support the HTML5 canvas element
</canvas>
<button id= "xButton">Rotate X</button>
<button id= "yButton">Rotate Y</button>
<button id= "zButton">Rotate Z</button>
</body>
</html>