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<!--
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL 2 Texture Switch Conformance Tests</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>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";
description("Ensures that switching the texture referenced by a sampler uniform performs reasonably well.");
var wtu = WebGLTestUtils;
var canvas = document.createElement('canvas');
canvas.width = 32;
canvas.height = 32;
var gl = wtu.create3DContext(canvas, undefined, 2);
if (!gl) {
testFailed("context does not exist");
finishTest();
} else {
var program = wtu.setupTexturedQuad(gl);
var tex = gl.createTexture();
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, tex);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
var tex2 = gl.createTexture();
gl.activeTexture(gl.TEXTURE1);
gl.bindTexture(gl.TEXTURE_2D, tex);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
var loc = gl.getUniformLocation(program, "tex");
var RUNTIME = 2000;
var THRESHOLD = 0.8;
var baseStartTime = 0;
var baseFrameCount = 0;
var testStartTime = 0;
var testFrameCount = 0;
baseStartTime = Date.now();
function drawBaseline() {
for (var i = 0; i < 400; ++i) {
gl.uniform1i(loc, 0);
gl.drawArrays(gl.TRIANGLES, 0, 6);
gl.uniform1i(loc, 0);
gl.drawArrays(gl.TRIANGLES, 0, 6);
}
++baseFrameCount;
if (Date.now() - baseStartTime > RUNTIME) {
testStartTime = Date.now();
requestAnimationFrame(drawTest);
} else {
requestAnimationFrame(drawBaseline);
}
}
function drawTest() {
for (var i = 0; i < 400; ++i) {
gl.uniform1i(loc, 0);
gl.drawArrays(gl.TRIANGLES, 0, 6);
gl.uniform1i(loc, 1);
gl.drawArrays(gl.TRIANGLES, 0, 6);
}
++testFrameCount;
if (Date.now() - testStartTime > RUNTIME) {
var perfString = " - achieved " + testFrameCount + " frames in " + ((Date.now() - testStartTime) / 1000.0) +
" seconds (" + (testFrameCount / baseFrameCount).toFixed(2) + " times baseline performance)";
if (testFrameCount > baseFrameCount * THRESHOLD) {
testPassed("Texture switching did not significantly hurt performance" + perfString);
} else {
testFailed("Texture switching significantly hurt performance" + perfString);
}
console.log(testFrameCount);
finishTest();
} else {
requestAnimationFrame(drawTest);
}
}
requestAnimationFrame(drawBaseline);
}
var successfullyParsed = true;
</script>
</body>
</html>
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