WebGLRenderer: Remove unnecessary `__hasExternalTextures` check. (#27684)

* fix: remove unnecessasy if statement

* lint: fix lint

* lint: fix lint

* fix: revert `vaoAvailable`

src/renderers/WebGLRenderer.js

@@ -2171,20 +2171,16 @@ class WebGLRenderer {
 			const renderTargetProperties = properties.get( renderTarget );
 			renderTargetProperties.__hasExternalTextures = true;
 
-			if ( renderTargetProperties.__hasExternalTextures ) {
+			renderTargetProperties.__autoAllocateDepthBuffer = depthTexture === undefined;
 
-				renderTargetProperties.__autoAllocateDepthBuffer = depthTexture === undefined;
+			if ( ! renderTargetProperties.__autoAllocateDepthBuffer ) {
 
-				if ( ! renderTargetProperties.__autoAllocateDepthBuffer ) {
+				// The multisample_render_to_texture extension doesn't work properly if there
+				// are midframe flushes and an external depth buffer. Disable use of the extension.
+				if ( extensions.has( 'WEBGL_multisampled_render_to_texture' ) === true ) {
 
-					// The multisample_render_to_texture extension doesn't work properly if there
-					// are midframe flushes and an external depth buffer. Disable use of the extension.
-					if ( extensions.has( 'WEBGL_multisampled_render_to_texture' ) === true ) {
-
-						console.warn( 'THREE.WebGLRenderer: Render-to-texture extension was disabled because an external texture was provided' );
-						renderTargetProperties.__useRenderToTexture = false;
-
-					}
+					console.warn( 'THREE.WebGLRenderer: Render-to-texture extension was disabled because an external texture was provided' );
+					renderTargetProperties.__useRenderToTexture = false;
 
 				}
 

src/renderers/webgl/WebGLTextures.js

@@ -626,8 +626,6 @@ function WebGLTextures( _gl, extensions, state, properties, capabilities, utils,
 
 		if ( extensions.has( 'EXT_texture_filter_anisotropic' ) === true ) {
 
-			const extension = extensions.get( 'EXT_texture_filter_anisotropic' );
-
 			if ( texture.magFilter === NearestFilter ) return;
 			if ( texture.minFilter !== NearestMipmapLinearFilter && texture.minFilter !== LinearMipmapLinearFilter ) return;
 			if ( texture.type === FloatType && extensions.has( 'OES_texture_float_linear' ) === false ) return; // verify extension for WebGL 1 and WebGL 2
@@ -635,6 +633,7 @@ function WebGLTextures( _gl, extensions, state, properties, capabilities, utils,
 
 			if ( texture.anisotropy > 1 || properties.get( texture ).__currentAnisotropy ) {
 
+				const extension = extensions.get( 'EXT_texture_filter_anisotropic' );
 				_gl.texParameterf( textureType, extension.TEXTURE_MAX_ANISOTROPY_EXT, Math.min( texture.anisotropy, capabilities.getMaxAnisotropy() ) );
 				properties.get( texture ).__currentAnisotropy = texture.anisotropy;