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index3.php
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<!doctype html>
<html>
<head>
<title>Tutorial 3 - Load shaders from script tags</title>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<script src = 'http://www.tigrisgames.com/js/jquery.js' type = 'text/javascript'></script>
<script src = 'http://www.tigrisgames.com/js/ui.js' type = 'text/javascript'></script>
<script src = 'http://www.tigrisgames.com/fx/gl.js'></script>
<script src = 'http://www.tigrisgames.com/fx/shaders.js'></script>
<script src = 'http://www.tigrisgames.com/fx/gl-1.js'></script>
<!-- Standard vertex shader //-->
<script type = "glsl" id = "standard-vs">void main() {
gl_Position = vec4(0.0, 0.0, 0.0, 1);
gl_PointSize = 10.0;
}
</script>
<!-- Fragment vertex shader //-->
<script type = "glsl" id = "standard-frag">void main() {
gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
}
</script>
<script type = "text/javascript">
/* -- Gl functions -- */
var canvas = null;
var gl = null;
$(document).ready(function() {
var canvas = document.getElementById('gl');
gl = GetWebGLContext(canvas);
if (!gl)
console.log('Failed to set up WebGL.');
else { // Load a shader from script tags
var vs = document.getElementById("standard-vs").innerHTML;
var fs = document.getElementById("standard-frag").innerHTML;
Shader.standardProgram = InitializeShader(gl, vs, fs);
gl.useProgram( Shader.standardProgram );
gl.drawArrays(gl.POINTS, 0, 1);
}
});
// An event that fires when all shader resources finish loading in CreateShadersFromFile
window.webGLResourcesLoaded = function() {
console.log("webGLResourcesLoaded(): All webGL shaders have finished loading!");
// Start main drawing loop
var T = setInterval(function() {
if (!gl)
return;
// Create WebGL canvas
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
// Draw a point
gl.useProgram( Shader.standardProgram );
gl.drawArrays(gl.POINTS, 0, 1);
});
}
</script>
</head>
<style>
#fx { position: relative; margin: 0 auto; width: 1000px; height: 500px; border: 1px solid gray; }
#gl { width: 800px; height: 600px; }
</style>
<body style = "background: #202020; padding: 32px;">
<canvas id = "gl" width = "800" height = "600"></canvas>
</body>
</html>