NvServices refactoring (#120)

* Initial implementation of NvMap/NvHostCtrl

* More work on NvHostCtrl

* Refactoring of nvservices, move GPU Vmm, make Vmm per-process, refactor most gpu devices, move Gpu to Core, fix CbBind

* Implement GetGpuTime, support CancelSynchronization, fix issue on InsertWaitingMutex, proper double buffering support (again, not working properly for commercial games, only hb)

* Try to fix perf regression reading/writing textures, moved syncpts and events to a UserCtx class, delete global state when the process exits, other minor tweaks

* Remove now unused code, add comment about probably wrong result codes

Ryujinx.Core/Gpu/TextureWriter.cs

@@ -0,0 +1,48 @@
+using ChocolArm64.Memory;
+using Ryujinx.Graphics.Gal;
+using System;
+
+namespace Ryujinx.Core.Gpu
+{
+    public static class TextureWriter
+    {
+        public static void Write(IAMemory Memory, Texture Texture, byte[] Data)
+        {
+            switch (Texture.Format)
+            {
+                case GalTextureFormat.A8B8G8R8: Write4Bpp(Memory, Texture, Data); break;
+
+                default: throw new NotImplementedException(Texture.Format.ToString());
+            }
+        }
+
+        private unsafe static void Write4Bpp(IAMemory Memory, Texture Texture, byte[] Data)
+        {
+            int Width  = Texture.Width;
+            int Height = Texture.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;
+                }
+            }
+        }
+    }
+}