@xeokit/xeokit-sdk
Version:
3D BIM IFC Viewer SDK for AEC engineering applications. Open Source JavaScript Toolkit based on pure WebGL for top performance, real-world coordinates and full double precision
32 lines (31 loc) • 1.37 kB
JavaScript
/**
* @private
*/
function getExtension (gl, name) {
if (gl._cachedExtensions === undefined) {
gl._cachedExtensions = {};
}
if (gl._cachedExtensions[name] !== undefined) {
return gl._cachedExtensions[name];
}
let extension;
switch (name) {
case 'WEBGL_depth_texture':
extension = gl.getExtension('WEBGL_depth_texture') || gl.getExtension('MOZ_WEBGL_depth_texture') || gl.getExtension('WEBKIT_WEBGL_depth_texture');
break;
case 'EXT_texture_filter_anisotropic':
extension = gl.getExtension('EXT_texture_filter_anisotropic') || gl.getExtension('MOZ_EXT_texture_filter_anisotropic') || gl.getExtension('WEBKIT_EXT_texture_filter_anisotropic');
break;
case 'WEBGL_compressed_texture_s3tc':
extension = gl.getExtension('WEBGL_compressed_texture_s3tc') || gl.getExtension('MOZ_WEBGL_compressed_texture_s3tc') || gl.getExtension('WEBKIT_WEBGL_compressed_texture_s3tc');
break;
case 'WEBGL_compressed_texture_pvrtc':
extension = gl.getExtension('WEBGL_compressed_texture_pvrtc') || gl.getExtension('WEBKIT_WEBGL_compressed_texture_pvrtc');
break;
default:
extension = gl.getExtension(name);
}
gl._cachedExtensions[name] = extension;
return extension;
}
export {getExtension};