Initial support for GPU channels (#2372)

* Ground work for separate GPU channels

* Rename TextureManager to TextureCache

* Decouple texture bindings management from the texture cache

* Rename BufferManager to BufferCache

* Decouple buffer bindings management from the buffer cache

* More comments and proper disposal

* PR feedback

* Force host state update on channel switch

* Typo

* PR feedback

* Missing using

Ryujinx.Graphics.Gpu/State/GpuState.cs

@@ -1,4 +1,5 @@
-using System;
+using Ryujinx.Graphics.Gpu.Image;
+using System;
 using System.Runtime.InteropServices;
 
 namespace Ryujinx.Graphics.Gpu.State
@@ -37,11 +38,19 @@ namespace Ryujinx.Graphics.Gpu.State
         /// </summary>
         public ShadowRamControl ShadowRamControl { get; set; }
 
+        /// <summary>
+        /// GPU channel for the sub-channel state.
+        /// </summary>
+        public GpuChannel Channel { get; }
+
         /// <summary>
         /// Creates a new instance of the GPU state.
         /// </summary>
-        public GpuState()
+        /// <param name="channel">Channel that the sub-channel state belongs to</param>
+        public GpuState(GpuChannel channel)
         {
+            Channel = channel;
+
             _memory = new int[RegistersCount];
             _shadow = new int[RegistersCount];
 
@@ -221,6 +230,21 @@ namespace Ryujinx.Graphics.Gpu.State
             }
         }
 
+        /// <summary>
+        /// Forces a full host state update by marking all state as modified,
+        /// and also requests all GPU resources in use to be rebound.
+        /// </summary>
+        public void ForceAllDirty()
+        {
+            for (int index = 0; index < _registers.Length; index++)
+            {
+                _registers[index].Modified = true;
+            }
+
+            Channel.BufferManager.Rebind();
+            Channel.TextureManager.Rebind();
+        }
+
         /// <summary>
         /// Checks if a given register has been modified since the last call to this method.
         /// </summary>