WebGLRenderer: Clean up setupRenderBufferStorage (#32456)

src/renderers/webgl/WebGLTextures.js

@@ -1575,7 +1575,7 @@ function WebGLTextures( _gl, extensions, state, properties, capabilities, utils,
 	}
 
 	// Setup storage for internal depth/stencil buffers and bind to correct framebuffer
-	function setupRenderBufferStorage( renderbuffer, renderTarget, isMultisample ) {
+	function setupRenderBufferStorage( renderbuffer, renderTarget, useMultisample ) {
 
 		_gl.bindRenderbuffer( _gl.RENDERBUFFER, renderbuffer );
 
@@ -1588,15 +1588,13 @@ function WebGLTextures( _gl, extensions, state, properties, capabilities, utils,
 			const glAttachmentType = renderTarget.stencilBuffer ? _gl.DEPTH_STENCIL_ATTACHMENT : _gl.DEPTH_ATTACHMENT;
 
 			// set up the attachment
-			const samples = getRenderTargetSamples( renderTarget );
-			const isUseMultisampledRTT = useMultisampledRTT( renderTarget );
-			if ( isUseMultisampledRTT ) {
+			if ( useMultisampledRTT( renderTarget ) ) {
 
-				multisampledRTTExt.renderbufferStorageMultisampleEXT( _gl.RENDERBUFFER, samples, glInternalFormat, renderTarget.width, renderTarget.height );
+				multisampledRTTExt.renderbufferStorageMultisampleEXT( _gl.RENDERBUFFER, getRenderTargetSamples( renderTarget ), glInternalFormat, renderTarget.width, renderTarget.height );
 
-			} else if ( isMultisample ) {
+			} else if ( useMultisample ) {
 
-				_gl.renderbufferStorageMultisample( _gl.RENDERBUFFER, samples, glInternalFormat, renderTarget.width, renderTarget.height );
+				_gl.renderbufferStorageMultisample( _gl.RENDERBUFFER, getRenderTargetSamples( renderTarget ), glInternalFormat, renderTarget.width, renderTarget.height );
 
 			} else {
 
@@ -1617,15 +1615,14 @@ function WebGLTextures( _gl, extensions, state, properties, capabilities, utils,
 				const glFormat = utils.convert( texture.format, texture.colorSpace );
 				const glType = utils.convert( texture.type );
 				const glInternalFormat = getInternalFormat( texture.internalFormat, glFormat, glType, texture.colorSpace );
-				const samples = getRenderTargetSamples( renderTarget );
 
-				if ( isMultisample && useMultisampledRTT( renderTarget ) === false ) {
+				if ( useMultisampledRTT( renderTarget ) ) {
 
-					_gl.renderbufferStorageMultisample( _gl.RENDERBUFFER, samples, glInternalFormat, renderTarget.width, renderTarget.height );
+					multisampledRTTExt.renderbufferStorageMultisampleEXT( _gl.RENDERBUFFER, getRenderTargetSamples( renderTarget ), glInternalFormat, renderTarget.width, renderTarget.height );
 
-				} else if ( useMultisampledRTT( renderTarget ) ) {
+				} else if ( useMultisample ) {
 
-					multisampledRTTExt.renderbufferStorageMultisampleEXT( _gl.RENDERBUFFER, samples, glInternalFormat, renderTarget.width, renderTarget.height );
+					_gl.renderbufferStorageMultisample( _gl.RENDERBUFFER, getRenderTargetSamples( renderTarget ), glInternalFormat, renderTarget.width, renderTarget.height );
 
 				} else {