required-extensions.html

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"use strict";

const wtu = WebGLTestUtils;

let gl;

description("Ensure that required extensions are supported");

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

const supportedExts = gl.getSupportedExtensions();

function hasExt(name) {

    return supportedExts.indexOf(name) >= 0;

const has_s3tc = hasExt('WEBGL_compressed_texture_s3tc');

const has_s3tc_srgb = hasExt('WEBGL_compressed_texture_s3tc_srgb');

const has_rgtc = hasExt('EXT_texture_compression_rgtc');

const has_etc = hasExt('WEBGL_compressed_texture_etc');

debug(`has_s3tc: ${has_s3tc}`);

debug(`has_s3tc_srgb: ${has_s3tc_srgb}`);

debug(`has_rgtc: ${has_rgtc}`);

debug(`has_etc: ${has_etc}`);

shouldBeTrue("((has_s3tc && has_s3tc_srgb && has_rgtc) || has_etc)");

// ETC1 extension must not be exposed on WebGL 2.0 contexts without ETC2.

debug("");

const has_etc1 = hasExt('WEBGL_compressed_texture_etc1');

debug(`has_etc1: ${has_etc1}`);

shouldBeTrue("has_etc1 == has_etc");

debug("");

var successfullyParsed = true;

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