Small OpenGL Renderer refactoring (#177)

* Call OpenGL functions directly, remove the pfifo thread, some refactoring

* Fix PerformanceStatistics calculating the wrong host fps, remove wait event on PFIFO as this wasn't exactly was causing the freezes (may replace with an exception later)

* Organized the Gpu folder a bit more, renamed a few things, address PR feedback

* Make PerformanceStatistics thread safe

* Remove unused constant

* Use unlimited update rate for better pref

Ryujinx.Graphics/Gal/IGalBlend.cs

@@ -0,0 +1,22 @@
+namespace Ryujinx.Graphics.Gal
+{
+    public interface IGalBlend
+    {
+        void Enable();
+
+        void Disable();
+
+        void Set(
+            GalBlendEquation Equation,
+            GalBlendFactor   FuncSrc,
+            GalBlendFactor   FuncDst);
+
+        void SetSeparate(
+            GalBlendEquation EquationRgb,
+            GalBlendEquation EquationAlpha,
+            GalBlendFactor   FuncSrcRgb,
+            GalBlendFactor   FuncDstRgb,
+            GalBlendFactor   FuncSrcAlpha,
+            GalBlendFactor   FuncDstAlpha);
+    }
+}