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/Engines/NvGpuEngine2d.cs

@@ -0,0 +1,170 @@
+using Ryujinx.Graphics.Gal;
+using Ryujinx.HLE.Gpu.Memory;
+using Ryujinx.HLE.Gpu.Texture;
+using System.Collections.Generic;
+
+namespace Ryujinx.HLE.Gpu.Engines
+{
+    class NvGpuEngine2d : INvGpuEngine
+    {
+        private enum CopyOperation
+        {
+            SrcCopyAnd,
+            RopAnd,
+            Blend,
+            SrcCopy,
+            Rop,
+            SrcCopyPremult,
+            BlendPremult
+        }
+
+        public int[] Registers { get; private set; }
+
+        private NvGpu Gpu;
+
+        private Dictionary<int, NvGpuMethod> Methods;
+
+        public NvGpuEngine2d(NvGpu Gpu)
+        {
+            this.Gpu = Gpu;
+
+            Registers = new int[0xe00];
+
+            Methods = new Dictionary<int, NvGpuMethod>();
+
+            void AddMethod(int Meth, int Count, int Stride, NvGpuMethod Method)
+            {
+                while (Count-- > 0)
+                {
+                    Methods.Add(Meth, Method);
+
+                    Meth += Stride;
+                }
+            }
+
+            AddMethod(0xb5, 1, 1, TextureCopy);
+        }
+
+        public void CallMethod(NvGpuVmm Vmm, NvGpuPBEntry PBEntry)
+        {
+            if (Methods.TryGetValue(PBEntry.Method, out NvGpuMethod Method))
+            {
+                Method(Vmm, PBEntry);
+            }
+            else
+            {
+                WriteRegister(PBEntry);
+            }
+        }
+
+        private void TextureCopy(NvGpuVmm Vmm, NvGpuPBEntry PBEntry)
+        {
+            CopyOperation Operation = (CopyOperation)ReadRegister(NvGpuEngine2dReg.CopyOperation);
+
+            bool SrcLinear = ReadRegister(NvGpuEngine2dReg.SrcLinear) != 0;
+            int  SrcWidth  = ReadRegister(NvGpuEngine2dReg.SrcWidth);
+            int  SrcHeight = ReadRegister(NvGpuEngine2dReg.SrcHeight);
+
+            bool DstLinear = ReadRegister(NvGpuEngine2dReg.DstLinear) != 0;
+            int  DstWidth  = ReadRegister(NvGpuEngine2dReg.DstWidth);
+            int  DstHeight = ReadRegister(NvGpuEngine2dReg.DstHeight);
+            int  DstPitch  = ReadRegister(NvGpuEngine2dReg.DstPitch);
+            int  DstBlkDim = ReadRegister(NvGpuEngine2dReg.DstBlockDimensions);
+
+            TextureSwizzle DstSwizzle = DstLinear
+                ? TextureSwizzle.Pitch
+                : TextureSwizzle.BlockLinear;
+
+            int DstBlockHeight = 1 << ((DstBlkDim >> 4) & 0xf);
+
+            long Key = Vmm.GetPhysicalAddress(MakeInt64From2xInt32(NvGpuEngine2dReg.SrcAddress));
+
+            long SrcAddress = MakeInt64From2xInt32(NvGpuEngine2dReg.SrcAddress);
+            long DstAddress = MakeInt64From2xInt32(NvGpuEngine2dReg.DstAddress);
+
+            bool IsFbTexture = Gpu.Engine3d.IsFrameBufferPosition(Key);
+
+            if (IsFbTexture && DstLinear)
+            {
+                DstSwizzle = TextureSwizzle.BlockLinear;
+            }
+
+            TextureInfo DstTexture = new TextureInfo(
+                DstAddress,
+                DstWidth,
+                DstHeight,
+                DstBlockHeight,
+                DstBlockHeight,
+                DstSwizzle,
+                GalTextureFormat.A8B8G8R8);
+
+            if (IsFbTexture)
+            {
+                //TODO: Change this when the correct frame buffer resolution is used.
+                //Currently, the frame buffer size is hardcoded to 1280x720.
+                SrcWidth  = 1280;
+                SrcHeight = 720;
+
+                Gpu.Renderer.FrameBuffer.GetBufferData(Key, (byte[] Buffer) =>
+                {
+                    CopyTexture(
+                        Vmm,
+                        DstTexture,
+                        Buffer,
+                        SrcWidth,
+                        SrcHeight);
+                });
+            }
+            else
+            {
+                long Size = SrcWidth * SrcHeight * 4;
+
+                byte[] Buffer = Vmm.ReadBytes(SrcAddress, Size);
+
+                CopyTexture(
+                    Vmm,
+                    DstTexture,
+                    Buffer,
+                    SrcWidth,
+                    SrcHeight);
+            }
+        }
+
+        private void CopyTexture(
+            NvGpuVmm    Vmm,
+            TextureInfo Texture,
+            byte[]      Buffer,
+            int         Width,
+            int         Height)
+        {
+            TextureWriter.Write(Vmm, Texture, Buffer, Width, Height);
+        }
+
+        private long MakeInt64From2xInt32(NvGpuEngine2dReg Reg)
+        {
+            return
+                (long)Registers[(int)Reg + 0] << 32 |
+                (uint)Registers[(int)Reg + 1];
+        }
+
+        private void WriteRegister(NvGpuPBEntry PBEntry)
+        {
+            int ArgsCount = PBEntry.Arguments.Count;
+
+            if (ArgsCount > 0)
+            {
+                Registers[PBEntry.Method] = PBEntry.Arguments[ArgsCount - 1];
+            }
+        }
+
+        private int ReadRegister(NvGpuEngine2dReg Reg)
+        {
+            return Registers[(int)Reg];
+        }
+
+        private void WriteRegister(NvGpuEngine2dReg Reg, int Value)
+        {
+            Registers[(int)Reg] = Value;
+        }
+    }
+}