Separate GPU engines (part 2/2) (#2440)

* 3D engine now uses DeviceState too, plus new state modification tracking

* Remove old methods code

* Remove GpuState and friends

* Optimize DeviceState, force inline some functions

* This change was not supposed to go in

* Proper channel initialization

* Optimize state read/write methods even more

* Fix debug build

* Do not dirty state if the write is redundant

* The YControl register should dirty either the viewport or front face state too, to update the host origin

* Avoid redundant vertex buffer updates

* Move state and get rid of the Ryujinx.Graphics.Gpu.State namespace

* Comments and nits

* Fix rebase

* PR feedback

* Move changed = false to improve codegen

* PR feedback

* Carry RyuJIT a bit more

Ryujinx.Graphics.Gpu/Engine/Threed/DrawState.cs

@@ -0,0 +1,45 @@
+using Ryujinx.Graphics.GAL;
+
+namespace Ryujinx.Graphics.Gpu.Engine.Threed
+{
+    /// <summary>
+    /// Draw state.
+    /// </summary>
+    class DrawState
+    {
+        /// <summary>
+        /// First index to be used for the draw on the index buffer.
+        /// </summary>
+        public int FirstIndex;
+
+        /// <summary>
+        /// Number of indices to be used for the draw on the index buffer.
+        /// </summary>
+        public int IndexCount;
+
+        /// <summary>
+        /// Indicates if the next draw will be a indexed draw.
+        /// </summary>
+        public bool DrawIndexed;
+
+        /// <summary>
+        /// Indicates if any of the currently used vertex shaders reads the instance ID.
+        /// </summary>
+        public bool VsUsesInstanceId;
+
+        /// <summary>
+        /// Indicates if any of the currently used vertex buffers is instanced.
+        /// </summary>
+        public bool IsAnyVbInstanced;
+
+        /// <summary>
+        /// Primitive topology for the next draw.
+        /// </summary>
+        public PrimitiveTopology Topology;
+
+        /// <summary>
+        /// Index buffer data streamer for inline index buffer updates, such as those used in legacy OpenGL.
+        /// </summary>
+        public IbStreamer IbStreamer = new IbStreamer();
+    }
+}