texture-with-flip-y-and-premultiply-alpha.html

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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.

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<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>WebGL texture upload with FlipY and PremultiplyAlpha.</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="32" height="32" style="width: 40px; height: 40px;"></canvas>

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

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

<script>

// Regression test for crbug.com/765469

"use strict";

description("Checks uploading textures with FlipY and PremultiplyAlpha generates INVALID_OPERATION with invalid format/type");

var canvas;

var wtu = WebGLTestUtils;

var gl = wtu.create3DContext("example");

var tex = gl.createTexture();

gl.bindTexture(gl.TEXTURE_2D, tex);

function testUpload() {

  // Because WEBGL_depth_texture is enabled, UNSIGNED_SHORT becomes a valid type, but RGBA/UNSIGNED_SHORT is invalid.

  gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 2, 2, 0, gl.RGBA, gl.UNSIGNED_SHORT, new Uint16Array(2*2*4));

  wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "texImage2D() with invalid format/type combination");

var ext = gl.getExtension('WEBGL_depth_texture');

if (ext) {

  debug("");

  debug("Testing with FlipY = false, PremultiplyAlpha = false");

  testUpload();

  debug("");

  debug("Testing with FlipY = true, PremultiplyAlpha = false");

  gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, 1);

  gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, 0);

  testUpload();

  debug("");

  debug("Testing with FlipY = false, PremultiplyAlpha = true");

  gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, 0);

  gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, 1);

  testUpload();

  debug("");

  debug("Testing with FlipY = true, PremultiplyAlpha = true");

  gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, 1);

  gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, 1);

  testUpload();

} else {

  testPassed("WEBGL_depth_texture not supported, skipping tests.");

gl.deleteTexture(tex);

debug("");

var successfullyParsed = true;

</script>

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

</body>

</html>