Examples: Fix resizing in post-processing examples.

examples/webgl_postprocessing_backgrounds.html

@@ -241,8 +241,8 @@
 				renderer.setSize( width, height );
 
 				var pixelRatio = renderer.getPixelRatio();
-				var newWidth = Math.floor( width / pixelRatio ) || 1;
-				var newHeight = Math.floor( height / pixelRatio ) || 1;
+				var newWidth = Math.floor( width * pixelRatio ) || 1;
+				var newHeight = Math.floor( height * pixelRatio ) || 1;
 				composer.setSize( newWidth, newHeight );
 
 			}

examples/webgl_postprocessing_ssaa.html

@@ -145,8 +145,8 @@
 				renderer.setSize( width, height );
 
 				var pixelRatio = renderer.getPixelRatio();
-				var newWidth = Math.floor( width / pixelRatio ) || 1;
-				var newHeight = Math.floor( height / pixelRatio ) || 1;
+				var newWidth = Math.floor( width * pixelRatio ) || 1;
+				var newHeight = Math.floor( height * pixelRatio ) || 1;
 				composer.setSize( newWidth, newHeight );
 
 			}

examples/webgl_postprocessing_ssaa_unbiased.html

@@ -206,8 +206,8 @@
 				renderer.setSize( width, height );
 
 				var pixelRatio = renderer.getPixelRatio();
-				var newWidth = Math.floor( width / pixelRatio ) || 1;
-				var newHeight = Math.floor( height / pixelRatio ) || 1;
+				var newWidth = Math.floor( width * pixelRatio ) || 1;
+				var newHeight = Math.floor( height * pixelRatio ) || 1;
 				composer.setSize( newWidth, newHeight );
 
 			}

examples/webgl_postprocessing_taa.html

@@ -174,8 +174,8 @@
 				renderer.setSize( width, height );
 
 				var pixelRatio = renderer.getPixelRatio();
-				var newWidth = Math.floor( width / pixelRatio ) || 1;
-				var newHeight = Math.floor( height / pixelRatio ) || 1;
+				var newWidth = Math.floor( width * pixelRatio ) || 1;
+				var newHeight = Math.floor( height * pixelRatio ) || 1;
 				composer.setSize( newWidth, newHeight );
 
 			}