Improve gamma shader parity - fixes #611 (#790)

* Call gamma post process after `ui.render` #611

* Fixed "washed out" look.

* Improve gamma pass and cache viewport size

Minecraft.Client/PS3/PS3_Minecraft.cpp

@@ -86,6 +86,7 @@ char secureFileId[CELL_SAVEDATA_SECUREFILEID_SIZE] =
 #include "..\..\Minecraft.Client\Tesselator.h"
 #include "..\Common\Console_Awards_enum.h"
 #include "..\..\Minecraft.Client\Options.h"
+#include "..\GameRenderer.h"
 #include "Sentient\SentientManager.h"
 #include "..\..\Minecraft.World\IntCache.h"
 #include "..\Textures.h"
@@ -1245,6 +1246,8 @@ int main()
 		ui.tick();
 		ui.render();
 
+		pMinecraft->gameRenderer->ApplyGammaPostProcess();
+
 		// Present the frame.
 		PIXBeginNamedEvent(0,"Frame present");
 		RenderManager.Present();