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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
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<head>
<meta charset="utf-8">
<title>WebGL WEBGL_compressed_texture_etc1 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>
<script src="../../js/tests/compressed-texture-utils.js"></script>
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<body>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";
description("This test verifies the functionality of the WEBGL_compressed_texture_etc1 extension, if it is available.");

debug("");

var validFormats = {
  COMPRESSED_RGB_ETC1_WEBGL: 0x8D64,
};

function expectedByteLength(width, height, format) {
  return Math.floor((width + 3) / 4) * Math.floor((height + 3) / 4) * 8;
}

function getBlockDimensions(format) {
  return {width: 4, height: 4};
}

var wtu = WebGLTestUtils;
var ctu = CompressedTextureUtils;
var contextVersion = wtu.getDefault3DContextVersion();
var gl = wtu.create3DContext();
var WEBGL_compressed_texture_etc1;

var formats = null;

function runTest() {
  if (!gl) {
    testFailed("context does not exist");
  } else {
    testPassed("context exists");

    ctu.testCompressedFormatsUnavailableWhenExtensionDisabled(gl, validFormats, expectedByteLength, 4);

    WEBGL_compressed_texture_etc1 = gl.getExtension("WEBGL_compressed_texture_etc1");

    wtu.runExtensionSupportedTest(gl, "WEBGL_compressed_texture_etc1", WEBGL_compressed_texture_etc1 !== null);

    if (WEBGL_compressed_texture_etc1 !== null) {
      // Test that enum values are listed correctly in supported formats and in the extension object.
      ctu.testCompressedFormatsListed(gl, validFormats);
      ctu.testCorrectEnumValuesInExt(WEBGL_compressed_texture_etc1, validFormats);
      // Test that texture upload buffer size is validated correctly.
      ctu.testFormatRestrictionsOnBufferSize(gl, validFormats, expectedByteLength, getBlockDimensions);
    }
  }
}

runTest();

var successfullyParsed = true;
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