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<!DOCTYPE html>
<html>
<head>
<script id="vertex-shader" type="x-shader/x-vertex">
attribute vec4 vPosition;
void main()
{
    gl_Position = vPosition;
}
</script>
<script id="fragment-shader" type="x-shader/x-fragment">
precision mediump float;
void main()
{
    float rateX = 4.0;
    float rateY = 17.0;
    float sinScaleX = 30.0;
    float sinScaleY = 5200.0;

    float lerpValue = gl_FragCoord.y / 300.0;
    lerpValue = sin(lerpValue*sinScaleY);
    if (lerpValue>0.05) lerpValue = 0.5*lerpValue;

    float lerpValue2 = gl_FragCoord.x / 500.0;
    lerpValue2 = cos(lerpValue2*sinScaleX);
    if (lerpValue2>0.9) lerpValue2 = 0.8*lerpValue2;

    gl_FragColor = rateY * mix(vec4(22/255, 142/255, 100/255, 1.0), vec4(1.0, 0.0, 0.0, 1.0), lerpValue)
        + rateX * mix(vec4(2.0, 1.0, 7.0, 1.0), vec4(12.0, 0.0, 3.0, 1.0), lerpValue2);

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