demos/pentagon-class.html

<!DOCTYPE html>
<html>

<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 );

    // Remember: these 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;
    gl_Position.z = -gl_Position.z;
}
</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="../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="pentagon-class.js"></script>

<body>
    <canvas id="gl-canvas" width="512"" height=" 512">
        Oops ... your browser doesn't support the HTML5 canvas element
    </canvas>

    <br />

    <button id="xButton">Rotate X</button>
    <button id="yButton">Rotate Y</button>
    <button id="zButton">Rotate Z</button>

</body>

</html>