Drastically impove background rendering

Render glowmap to lower-resolution framebuffer

XIONControlPanel/Controllers/BackgroundViewController.swift

@@ -31,6 +31,7 @@ class BackgroundViewController: UIViewController {
         view.backgroundColor = UIColor.blackColor()
         view.scene = _scene
         view.allowsCameraControl = false
+        /* view.showsStatistics = true */
         
         _sceneView = view
         self.view = view

XIONControlPanel/Resources/CubletsTechnique.plist

@@ -81,7 +81,7 @@
 				<key>u_blurmapSampler</key>
 				<string>bothblurs_color</string>
 				<key>u_colorSampler</key>
-				<string>firstPass_color</string>
+				<string>COLOR</string>
 			</dict>
 			<key>outputs</key>
 			<dict>
@@ -94,16 +94,22 @@
 	<dict>
 		<key>firstPass_color</key>
 		<dict>
+			<key>size</key>
+			<string>512x512</string>
 			<key>type</key>
 			<string>color</string>
 		</dict>
 		<key>hblur_color</key>
 		<dict>
+			<key>size</key>
+			<string>512x512</string>
 			<key>type</key>
 			<string>color</string>
 		</dict>
 		<key>bothblurs_color</key>
 		<dict>
+			<key>size</key>
+			<string>512x512</string>
 			<key>type</key>
 			<string>color</string>
 		</dict>