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.HLE/Gpu/Texture/TextureWriter.cs

@@ -0,0 +1,55 @@
+using ChocolArm64.Memory;
+using Ryujinx.Graphics.Gal;
+using System;
+
+namespace Ryujinx.HLE.Gpu.Texture
+{
+    static class TextureWriter
+    {
+        public static void Write(
+            IAMemory    Memory,
+            TextureInfo Texture,
+            byte[]      Data,
+            int         Width,
+            int         Height)
+        {
+            switch (Texture.Format)
+            {
+                case GalTextureFormat.A8B8G8R8: Write4Bpp(Memory, Texture, Data, Width, Height); break;
+
+                default: throw new NotImplementedException(Texture.Format.ToString());
+            }
+        }
+
+        private unsafe static void Write4Bpp(
+            IAMemory    Memory,
+            TextureInfo Texture,
+            byte[]      Data,
+            int         Width,
+            int         Height)
+        {
+            ISwizzle Swizzle = TextureHelper.GetSwizzle(Texture, Width, 4);
+
+            (AMemory CpuMem, long Position) = TextureHelper.GetMemoryAndPosition(
+                Memory,
+                Texture.Position);
+
+            fixed (byte* BuffPtr = Data)
+            {
+                long InOffs = 0;
+
+                for (int Y = 0; Y < Height; Y++)
+                for (int X = 0; X < Width;  X++)
+                {
+                    long Offset = (uint)Swizzle.GetSwizzleOffset(X, Y);
+
+                    int Pixel = *(int*)(BuffPtr + InOffs);
+
+                    CpuMem.WriteInt32Unchecked(Position + Offset, Pixel);
+
+                    InOffs += 4;
+                }
+            }
+        }
+    }
+}