WebGLRenderer: readRenderTargetPixels clean up.

@nraynaud do you mind double checking that I didn't break anything?

src/renderers/WebGLRenderer.js

@@ -3192,60 +3192,71 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 	};
 
-	this.readRenderTargetPixels = function( renderTarget, x, y, width, height, buffer ) {
+	this.readRenderTargetPixels = function ( renderTarget, x, y, width, height, buffer ) {
 
-		if ( ! ( renderTarget instanceof THREE.WebGLRenderTarget ) ) {
+		if ( renderTarget instanceof THREE.WebGLRenderTarget === false ) {
 
 			console.error( 'THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not THREE.WebGLRenderTarget.' );
 			return;
 
 		}
 
-		if ( properties.get( renderTarget ).__webglFramebuffer ) {
+		var framebuffer = properties.get( renderTarget ).__webglFramebuffer;
+
+		if ( framebuffer ) {
 
 			var restore = false;
 
-			if ( properties.get( renderTarget ).__webglFramebuffer !== _currentFramebuffer ) {
+			if ( framebuffer !== _currentFramebuffer ) {
 
-				_gl.bindFramebuffer( _gl.FRAMEBUFFER, properties.get( renderTarget ).__webglFramebuffer );
+				_gl.bindFramebuffer( _gl.FRAMEBUFFER, framebuffer );
 
 				restore = true;
 
 			}
-	            	try {
-	                	if (renderTarget.texture.format !== THREE.RGBAFormat && paramThreeToGL(renderTarget.texture.format) !== _gl.getParameter(_gl.IMPLEMENTATION_COLOR_READ_FORMAT)) {
-	
-	                    		console.error('THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not in RGBA or implementation defined format.');
-	                    		return;
-	
-	                	}
-	
-	                	if (renderTarget.texture.type !== THREE.UnsignedByteType
-	                    		&& paramThreeToGL(renderTarget.texture.type) !== _gl.getParameter(_gl.IMPLEMENTATION_COLOR_READ_TYPE)
-	                    		&& !(renderTarget.texture.type === THREE.FloatType && extensions.get('WEBGL_color_buffer_float'))
-	                    		&& !(renderTarget.texture.type === THREE.HalfFloatType && extensions.get('EXT_color_buffer_half_float'))) {
-	
-	                    		console.error('THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not in UnsignedByteType or implementation defined type.');
-	                    		return;
-	
-	                	}
-	
-	                	if (_gl.checkFramebufferStatus(_gl.FRAMEBUFFER) === _gl.FRAMEBUFFER_COMPLETE) {
-	
-	                    		_gl.readPixels(x, y, width, height, paramThreeToGL(renderTarget.texture.format), paramThreeToGL(renderTarget.texture.type), buffer);
-	
-	                	} else {
-	
-	                		 console.error('THREE.WebGLRenderer.readRenderTargetPixels: readPixels from renderTarget failed. Framebuffer not complete.');
-	
-	                	}
-	            	} finally {
-	                	if ( restore ) {
-	
-	                    		_gl.bindFramebuffer( _gl.FRAMEBUFFER, _currentFramebuffer );
-	
-	                	}
-	            	}
+
+			try {
+
+				var texture = renderTarget.texture;
+
+				if ( texture.format !== THREE.RGBAFormat
+					&& paramThreeToGL( texture.format ) !== _gl.getParameter( _gl.IMPLEMENTATION_COLOR_READ_FORMAT ) ) {
+
+					console.error( 'THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not in RGBA or implementation defined format.' );
+					return;
+
+				}
+
+				if ( texture.type !== THREE.UnsignedByteType
+					&& paramThreeToGL( texture.type ) !== _gl.getParameter( _gl.IMPLEMENTATION_COLOR_READ_TYPE )
+					&& ! ( texture.type === THREE.FloatType && extensions.get( 'WEBGL_color_buffer_float' ) )
+					&& ! ( texture.type === THREE.HalfFloatType && extensions.get( 'EXT_color_buffer_half_float' ) ) ) {
+
+					console.error( 'THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not in UnsignedByteType or implementation defined type.' );
+					return;
+
+				}
+
+				if ( _gl.checkFramebufferStatus( _gl.FRAMEBUFFER ) === _gl.FRAMEBUFFER_COMPLETE ) {
+
+					_gl.readPixels( x, y, width, height, paramThreeToGL( texture.format ), paramThreeToGL( texture.type ), buffer );
+
+				} else {
+
+					console.error( 'THREE.WebGLRenderer.readRenderTargetPixels: readPixels from renderTarget failed. Framebuffer not complete.' );
+
+				}
+
+			} finally {
+
+				if ( restore ) {
+
+					_gl.bindFramebuffer( _gl.FRAMEBUFFER, _currentFramebuffer );
+
+				}
+
+			}
+
 		}
 
 	};