WebGLExtensions: Introduce init().

src/renderers/WebGLRenderer.js

@@ -276,25 +276,7 @@ function WebGLRenderer( parameters ) {
 
 		capabilities = new WebGLCapabilities( _gl, extensions, parameters );
 
-		if ( capabilities.isWebGL2 ) {
-
-			extensions.get( 'EXT_color_buffer_float' );
-
-		} else {
-
-			extensions.get( 'WEBGL_depth_texture' );
-			extensions.get( 'OES_texture_float' );
-			extensions.get( 'OES_texture_half_float' );
-			extensions.get( 'OES_texture_half_float_linear' );
-			extensions.get( 'OES_standard_derivatives' );
-			extensions.get( 'OES_element_index_uint' );
-			extensions.get( 'OES_vertex_array_object' );
-			extensions.get( 'ANGLE_instanced_arrays' );
-
-		}
-
-		extensions.get( 'OES_texture_float_linear' );
-		extensions.get( 'EXT_color_buffer_half_float' );
+		extensions.init( capabilities );
 
 		utils = new WebGLUtils( _gl, extensions, capabilities );
 

src/renderers/webgl/WebGLExtensions.d.ts

@@ -1,8 +1,11 @@
+import { WebGLCapabilities } from './WebGLCapabilities';
+
 export class WebGLExtensions {
 
 	constructor( gl: WebGLRenderingContext );
 
 	has( name: string ): boolean;
+	init( capabilities: WebGLCapabilities ): void;
 	get( name: string ): any;
 
 }

src/renderers/webgl/WebGLExtensions.js

@@ -2,56 +2,88 @@ function WebGLExtensions( gl ) {
 
 	const extensions = {};
 
-	return {
+	function getExtension( name ) {
 
-		has: function ( name ) {
+		if ( extensions[ name ] !== undefined ) {
+
+			return extensions[ name ];
 
-			if ( extensions[ name ] !== undefined ) {
+		}
 
-				return extensions[ name ] !== null;
+		let extension;
 
-			}
+		switch ( name ) {
 
-			let extension;
+			case 'WEBGL_depth_texture':
+				extension = gl.getExtension( 'WEBGL_depth_texture' ) || gl.getExtension( 'MOZ_WEBGL_depth_texture' ) || gl.getExtension( 'WEBKIT_WEBGL_depth_texture' );
+				break;
 
-			switch ( name ) {
+			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_depth_texture':
-					extension = gl.getExtension( 'WEBGL_depth_texture' ) || gl.getExtension( 'MOZ_WEBGL_depth_texture' ) || gl.getExtension( 'WEBKIT_WEBGL_depth_texture' );
-					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 '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_pvrtc':
+				extension = gl.getExtension( 'WEBGL_compressed_texture_pvrtc' ) || gl.getExtension( 'WEBKIT_WEBGL_compressed_texture_pvrtc' );
+				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;
+			default:
+				extension = gl.getExtension( name );
 
-				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 ( capabilities ) {
+
+			if ( capabilities.isWebGL2 ) {
 
-			extensions[ name ] = extension;
+				getExtension( 'EXT_color_buffer_float' );
 
-			return extension !== null;
+			} else {
+
+				getExtension( 'WEBGL_depth_texture' );
+				getExtension( 'OES_texture_float' );
+				getExtension( 'OES_texture_half_float' );
+				getExtension( 'OES_texture_half_float_linear' );
+				getExtension( 'OES_standard_derivatives' );
+				getExtension( 'OES_element_index_uint' );
+				getExtension( 'OES_vertex_array_object' );
+				getExtension( 'ANGLE_instanced_arrays' );
+
+			}
+
+			getExtension( 'OES_texture_float_linear' );
+			getExtension( 'EXT_color_buffer_half_float' );
 
 		},
 
 		get: function ( name ) {
 
-			if ( ! this.has( name ) ) {
+			const extension = getExtension( name );
+
+			if ( extension === null ) {
 
 				console.warn( 'THREE.WebGLRenderer: ' + name + ' extension not supported.' );
 
 			}
 
-			return extensions[ name ];
+			return extension;
 
 		}