Updated to the new extension name

src/renderers/WebGLRenderer.js

@@ -1275,7 +1275,7 @@ function WebGLRenderer( parameters = {} ) {
 				magFilter: NearestFilter,
 				wrapS: ClampToEdgeWrapping,
 				wrapT: ClampToEdgeWrapping,
-				useRenderToTexture: extensions.has( 'EXT_multisampled_render_to_texture' )
+				useRenderToTexture: extensions.has( 'WEBGL_multisampled_render_to_texture' )
 			} );
 
 		}

src/renderers/webgl/WebGLExtensions.js

@@ -65,12 +65,12 @@ function WebGLExtensions( gl ) {
 				getExtension( 'OES_element_index_uint' );
 				getExtension( 'OES_vertex_array_object' );
 				getExtension( 'ANGLE_instanced_arrays' );
-				getExtension( 'EXT_multisampled_render_to_texture' );
 
 			}
 
 			getExtension( 'OES_texture_float_linear' );
 			getExtension( 'EXT_color_buffer_half_float' );
+			getExtension( 'WEBGL_multisampled_render_to_texture' );
 
 		},
 

src/renderers/webgl/WebGLTextures.js

@@ -9,8 +9,8 @@ function WebGLTextures( _gl, extensions, state, properties, capabilities, utils,
 	const maxCubemapSize = capabilities.maxCubemapSize;
 	const maxTextureSize = capabilities.maxTextureSize;
 	const maxSamples = capabilities.maxSamples;
-	const hasMultisampledRenderToTexture = extensions.has( 'EXT_multisampled_render_to_texture' );
-	const MultisampledRenderToTextureExtension = hasMultisampledRenderToTexture ? extensions.get( 'EXT_multisampled_render_to_texture' ) : undefined;
+	const hasMultisampledRenderToTexture = extensions.has( 'WEBGL_multisampled_render_to_texture' );
+	const MultisampledRenderToTextureExtension = hasMultisampledRenderToTexture ? extensions.get( 'WEBGL_multisampled_render_to_texture' ) : undefined;
 
 	const _videoTextures = new WeakMap();
 	let _canvas;

src/renderers/webxr/WebXRManager.js

@@ -31,7 +31,7 @@ class WebXRManager extends EventDispatcher {
 
 		let referenceSpace = null;
 		let referenceSpaceType = 'local-floor';
-		const hasMultisampledRenderToTexture = renderer.extensions.has( 'EXT_multisampled_render_to_texture' );
+		const hasMultisampledRenderToTexture = renderer.extensions.has( 'WEBGL_multisampled_render_to_texture' );
 
 		let pose = null;
 		let glBinding = null;