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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL Lots of polygons example.</title>
<link rel="stylesheet" href="../resources/js-test-style.css"/>
<script src="../js/js-test-pre.js"></script>
<script src="../js/webgl-test-utils.js"> </script>
</head>
<body>
<canvas id="example" width="1024" height="1024" style="width: 40px; height: 40px;">
</canvas>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";
window.onload = init;
debug("Tests a WebGL program that draws a bunch of large polygons");
function init() {
if (confirm(
"After clicking OK your machine may become unresponsive or crash.")) {
main();
} else {
debug("cancelled");
}
}
function main() {
var wtu = WebGLTestUtils;
var canvas = document.getElementById("example");
canvas.addEventListener("webglcontextlost", function(e) { e.preventDefault(); }, false);
canvas.addEventListener("webglcontextrestored", function(e) { }, false);
var gl = wtu.create3DContext(canvas);
var program = wtu.setupTexturedQuad(gl);
assertMsg(gl.getError() == gl.NO_ERROR, "Should be no errors from setup.");
var tex = gl.createTexture();
gl.enable(gl.BLEND);
gl.disable(gl.DEPTH_TEST);
wtu.fillTexture(gl, tex, 4096, 4096, [0, 192, 128, 255], 0);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after creating texture");
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after setting texture params");
var loc = gl.getUniformLocation(program, "tex");
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after getting tex locations");
gl.uniform1i(loc, 0);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after setting tex uniform");
var numQuads = 100000;
var indexBuf = new ArrayBuffer(numQuads * 6);
var indices = new Uint8Array(indexBuf);
for (var ii = 0; ii < numQuads; ++ii) {
var offset = ii * 6;
indices[offset + 0] = 0;
indices[offset + 1] = 1;
indices[offset + 2] = 2;
indices[offset + 3] = 3;
indices[offset + 4] = 4;
indices[offset + 5] = 5;
}
var indexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after creating index buffer");
gl.drawElements(gl.TRIANGLES, numQuads * 6, gl.UNSIGNED_BYTE, 0);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after drawing");
var successfullyParsed = true;
}
</script>
</body>
</html>