Separate GPU engines and make state follow official docs (part 1/2) (#2422)

* Use DeviceState for compute and i2m

* Migrate 2D class, more comments

* Migrate DMA copy engine

* Remove now unused code

* Replace GpuState by GpuAccessorState on GpuAcessor, since compute no longer has a GpuState

* More comments

* Add logging (disabled)

* Add back i2m on 3D engine

Ryujinx.Graphics.Gpu/Shader/GpuAccessorState.cs

@@ -0,0 +1,43 @@
+namespace Ryujinx.Graphics.Gpu.Shader
+{
+    /// <summary>
+    /// State used by the <see cref="GpuAccessor"/>.
+    /// </summary>
+    struct GpuAccessorState
+    {
+        /// <summary>
+        /// GPU virtual address of the texture pool.
+        /// </summary>
+        public ulong TexturePoolGpuVa { get; }
+
+        /// <summary>
+        /// Maximum ID of the texture pool.
+        /// </summary>
+        public int TexturePoolMaximumId { get; }
+
+        /// <summary>
+        /// Constant buffer slot where the texture handles are located.
+        /// </summary>
+        public int TextureBufferIndex { get; }
+
+        /// <summary>
+        /// Early Z force enable.
+        /// </summary>
+        public bool EarlyZForce { get; }
+
+        /// <summary>
+        /// Creates a new instance of the GPU accessor state.
+        /// </summary>
+        /// <param name="texturePoolGpuVa">GPU virtual address of the texture pool</param>
+        /// <param name="texturePoolMaximumId">Maximum ID of the texture pool</param>
+        /// <param name="textureBufferIndex">Constant buffer slot where the texture handles are located</param>
+        /// <param name="earlyZForce">Early Z force enable</param>
+        public GpuAccessorState(ulong texturePoolGpuVa, int texturePoolMaximumId, int textureBufferIndex, bool earlyZForce)
+        {
+            TexturePoolGpuVa = texturePoolGpuVa;
+            TexturePoolMaximumId = texturePoolMaximumId;
+            TextureBufferIndex = textureBufferIndex;
+            EarlyZForce = earlyZForce;
+        }
+    }
+}