multi-context-sampler-test.html

Enable keyboard shortcuts

<!--

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 Multi-Context Sampler Test</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="canvas_drawing" width="12" height="12"></canvas>

<div id="description"></div>

<div id="console"></div>

<script>

"use strict";

description("Tests that samplers' state doesn't leak across contexts");

debug("");

debug('Regression test for <a href="http://crbug.com/713127">http://crbug.com/713127</a>');

function runTest() {

    var wtu = WebGLTestUtils;

    var gl = wtu.create3DContext("canvas_drawing", undefined, 2);

    var texture = null;

    var color = [0, 255, 0, 255];

    if (!gl) {

        testFailed("WebGL context does not exist");

        return;

    testPassed("WebGL context exists");

    wtu.setupTexturedQuad(gl);

    texture = gl.createTexture();

    // Create a texture bigger than 1x1 so that it would need mipmaps in

    // order to be complete.

    wtu.fillTexture(gl, texture, 2, 2, color, 0,

                    gl.RGBA, gl.UNSIGNED_BYTE, gl.RGBA8);

    // Set texture parameters so that this texture is complete.

    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);

    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);

    // Set up a secondary context with a sampler bound to texture unit

    // 0. This should not interfere with the primary context.

    var altGL = wtu.create3DContext(undefined, undefined, 2);

    if (!altGL) {

        testFailed("Error creating secondary WebGL context");

        return;

    var sampler = altGL.createSampler();

    // Note that the sampler's default TEXTURE_MIN_FILTER is

    // NEAREST_MIPMAP_LINEAR.

    altGL.bindSampler(0, sampler);

    altGL.clearColor(1, 0, 0, 1);

    altGL.clear(altGL.COLOR_BUFFER_BIT);

    wtu.checkCanvasRect(altGL, 0, 0, 1, 1, [ 255, 0, 0, 255 ],

                        "should be red");

    // Now switch back to the main context and draw the texture.

    gl.clearColor(1, 1, 1, 1);

    gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

    wtu.drawUnitQuad(gl);

    // The presence of the sampler on the other context should not

    // have interfered with the completeness of the texture.

    wtu.checkCanvasRect(gl, 0, 0, 1, 1, color,

                        "should be green");

    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");

runTest();

var successfullyParsed = true;

</script>

<script src="../../js/js-test-post.js"></script>

</body>

</html>