texture-copying-and-deletion.html

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Copyright (c) 2020 The Khronos Group Inc.

Use of this source code is governed by an MIT-style license that can be

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<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>WebGL Texture Copying and Deletion 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="example" width="1" height="1" style="width: 40px; height: 40px;"></canvas>

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

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

<script>

"use strict";

description('Checks that texture copying and deletion work correctly together.');

debug('Regression test for <a href="http://anglebug.com/4267">http://anglebug.com/4267</a>');

const wtu = WebGLTestUtils;

const canvas = document.getElementById("example");

canvas.addEventListener('webglcontextlost', contextLost, false);

let contextWasLost = false;

function contextLost(e) {

  e.preventDefault();

  contextWasLost = true;

  debug("***context lost -- should not happen***");

const gl = wtu.create3DContext(canvas);

const texture = gl.createTexture();

gl.bindTexture(gl.TEXTURE_2D, texture);

gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 2, 2, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);

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);

const texture2 = gl.createTexture();

gl.bindTexture(gl.TEXTURE_2D, texture2);

gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 2, 2, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);

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);

const framebuffer = gl.createFramebuffer();

gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);

gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);

assertMsg(gl.checkFramebufferStatus(gl.FRAMEBUFFER) == gl.FRAMEBUFFER_COMPLETE,

    "framebuffer should be FRAMEBUFFER_COMPLETE.");

wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after setup");

// This test does not call getError, because doing so seems to cause

// an implicit flush which intermittently masks the bug.

debug("");

debug("testing copyTexImage2D");

gl.bindTexture(gl.TEXTURE_2D, texture);

gl.copyTexImage2D(gl.TEXTURE_2D, 1, gl.RGBA, 0, 0, 2, 2, 0);

// Not necessary to do any CopyTexImage2D operations to texture2.

debug("");

debug("testing copyTexSubImage2D");

gl.bindTexture(gl.TEXTURE_2D, texture);

gl.copyTexSubImage2D(gl.TEXTURE_2D, 1, 0, 0, 0, 0, 1, 1);

gl.bindTexture(gl.TEXTURE_2D, texture2);

gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, 0, 0, 1, 1);

debug('deleting framebuffer');

gl.deleteFramebuffer(framebuffer);

debug('deleting texture');

gl.deleteTexture(texture);

debug('deleting texture2');

// On buggy driver, crashes during this deleteTexture call.

gl.deleteTexture(texture2);

setTimeout(function() {

  shouldBe("contextWasLost", "false");

  finishTest();

}, 1000);

</script>

</body>

</html>