<script id="vertex-shader" type="x-shader/x-vertex">

attribute vec4 vPosition;

attribute vec4 vColor;

varying vec4 fColor;

uniform vec3 theta;

void main()

// Compute the sines and cosines of theta for each of

// the three axes in one computation.

vec3 angles = radians( theta );

vec3 c = cos( angles );

vec3 s = sin( angles );

// Remeber: thse matrices are column-major

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 );

fColor = vColor;

gl_Position = rz * ry * rx * vPosition;

}

<script id="fragment-shader" type="x-shader/x-fragment">

precision mediump float;

uniform int i;

varying vec4 fColor;

vec4 c[7];

c[0] = fColor;

c[1] = vec4(1.0, 0.0, 0.0, 1.0);

c[2] = vec4(0.0, 1.0, 0.0, 1.0);

c[3] = vec4(0.0, 0.0, 1.0, 1.0);

c[4] = vec4(1.0, 1.0, 0.0, 1.0);

c[5] = vec4(0.0, 1.0, 1.0, 1.0);

c[6] = vec4(1.0, 0.0, 1.0, 1.0);

if(i==0) gl_FragColor = c[0];

else if(i==1) gl_FragColor = c[1];

else if(i==2) gl_FragColor = c[2];

else if(i==3) gl_FragColor = c[3];

else if(i==4) gl_FragColor = c[4];

else if(i==5) gl_FragColor = c[5];

else if(i==6) gl_FragColor = c[6];

<script type="text/javascript" src="../Common/webgl-utils.js"></script>

<script type="text/javascript" src="../Common/initShaders.js"></script>

<script type="text/javascript" src="../Common/MV.js"></script>

<script type="text/javascript" src="pickCube.js"></script>

<canvas id="gl-canvas" width="512" height="512">

Oops ... your browser doesn't support the HTML5 canvas element

<button id = "ButtonX">Rotate X</button>

<button id = "ButtonY">Rotate Y</button>

<button id = "ButtonZ">Rotate Z</button>

<button id = "ButtonT">Toggle Rotation</button>