import { warnOnce } from '../../utils.js';
function WebGLExtensions( gl ) {
const extensions = {};
function getExtension( name ) {
if ( extensions[ name ] !== undefined ) {
return extensions[ 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 );
}
extensions[ name ] = extension;
return extension;
}
return {
has: function ( name ) {
return getExtension( name ) !== null;
},
init: function () {
getExtension( 'EXT_color_buffer_float' );
getExtension( 'WEBGL_clip_cull_distance' );
getExtension( 'OES_texture_float_linear' );
getExtension( 'EXT_color_buffer_half_float' );
getExtension( 'WEBGL_multisampled_render_to_texture' );
getExtension( 'WEBGL_render_shared_exponent' );
},
get: function ( name ) {
const extension = getExtension( name );
if ( extension === null ) {
warnOnce( 'THREE.WebGLRenderer: ' + name + ' extension not supported.' );
}
return extension;
}
};
}
export { WebGLExtensions };