webgl-compressed-texture-etc1.html

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<title>WebGL WEBGL_compressed_texture_etc1 Conformance Tests</title>

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<script src="../../js/tests/compressed-texture-utils.js"></script>

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"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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