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+<!DOCTYPE html>
+<meta charset='UTF-8'>
+<!--
+Color Test
+
+Clear the four quadrants of the canvas as follows:
++------+------+
+| blue |black |
+| | |
++------+------+
+| red |green |
+| | |
++------+------+
+
+Clear with a given alpha value. What effect this has depends on the
+context-creation args passed to this page.
+-->
+<html class='reftest-wait'>
+
+<head>
+ <script type='text/javascript' src='webgl-utils.js'></script>
+ <script type='text/javascript'>
+'use strict';
+
+var COLOR_VALUE = 127.0 / 255.0;
+var ALPHA_VALUE = 127.0 / 255.0;
+
+function renderFrame(gl) {
+ gl.enable(gl.SCISSOR_TEST);
+
+ gl.scissor(0, 0, 100, 100);
+ gl.clearColor(COLOR_VALUE, 0.0, 0.0, ALPHA_VALUE);
+ gl.clear(gl.COLOR_BUFFER_BIT);
+
+ gl.scissor(100, 0, 100, 100);
+ gl.clearColor(0.0, COLOR_VALUE, 0.0, ALPHA_VALUE);
+ gl.clear(gl.COLOR_BUFFER_BIT);
+
+ gl.scissor(0, 100, 100, 100);
+ gl.clearColor(0.0, 0.0, COLOR_VALUE, ALPHA_VALUE);
+ gl.clear(gl.COLOR_BUFFER_BIT);
+
+ gl.scissor(100, 100, 100, 100);
+ gl.clearColor(0.0, 0.0, 0.0, ALPHA_VALUE);
+ gl.clear(gl.COLOR_BUFFER_BIT);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Boilerplate
+
+var TIMEOUT_MS = 30 * 1000;
+
+function setStatus(text) {
+ var elem = document.getElementById('status');
+ elem.innerHTML = text;
+}
+
+var gIsComplete = false;
+
+function markComplete(statusText) {
+ if (!statusText)
+ statusText = '';
+
+ if (gIsComplete)
+ return;
+ gIsComplete = true;
+
+ setStatus(statusText);
+ document.documentElement.removeAttribute('class');
+}
+
+function markError(text) {
+ markComplete('Error: ' + text);
+}
+
+function markTimedOut() {
+ markError('Timed out waiting on test completion.');
+}
+
+function runFrame(gl, frameCount, maxFrameCount) {
+ renderFrame(gl);
+ frameCount++;
+
+ if (frameCount >= maxFrameCount) {
+ console.log('Rendered ' + frameCount + ' frames.');
+ markComplete();
+ return;
+ }
+
+ requestAnimationFrame(function(){
+ runFrame(gl, frameCount, maxFrameCount);
+ });
+}
+
+function runTest() {
+ var canvas = document.getElementById('canvas');
+
+ var gl = initGL(canvas);
+ if (!gl) {
+ markError('WebGL context creation failed.');
+ return;
+ }
+
+ var maxFrameCount = arg('frame', 1);
+ if (maxFrameCount < 1) {
+ markError('Invalid `frame` arg: ' + maxFrameCount);
+ return;
+ }
+
+ setStatus('Waiting...');
+
+ runFrame(gl, 0, maxFrameCount);
+ setTimeout(markTimedOut, TIMEOUT_MS);
+}
+ </script>
+</head>
+
+<body onload='runTest();'>
+<canvas style="position:fixed; left: 0px; top: 0px;" id='canvas' width='200' height='200'></canvas>
+<div style="display:block; background-color: blue; position: fixed; top: 75px; left: 0px; width: 50px; height: 50px;"></div>
+<div id='status'></div>
+</body>
+
+</html>