State and cache optimization (#27)

* WIP pipeline/depth state cache rework

* Fix some issues

* Fix some more default values

* Reduce allocations for state changes

* fix helpershader stuff

* explanation comment

* fix depth bias

src/Ryujinx.Graphics.Metal/TextureBase.cs

@@ -21,6 +21,7 @@ namespace Ryujinx.Graphics.Metal
         public int Width => Info.Width;
         public int Height => Info.Height;
         public int Depth => Info.Depth;
+        public MTLPixelFormat MtlFormat { get; protected set; }
 
         public TextureBase(MTLDevice device, MetalRenderer renderer, Pipeline pipeline, TextureCreateInfo info)
         {