Geometry shader emulation for macOS (#5551)

* Implement vertex and geometry shader conversion to compute

* Call InitializeReservedCounts for compute too

* PR feedback

* Set clip distance mask for geometry and tessellation shaders too

* Transform feedback emulation only for vertex

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

@@ -1,4 +1,5 @@
 using Ryujinx.Graphics.GAL;
+using Ryujinx.Graphics.Gpu.Shader;
 
 namespace Ryujinx.Graphics.Gpu.Engine.Threed
 {
@@ -61,5 +62,20 @@ namespace Ryujinx.Graphics.Gpu.Engine.Threed
         /// Index buffer data streamer for inline index buffer updates, such as those used in legacy OpenGL.
         /// </summary>
         public IbStreamer IbStreamer = new();
+
+        /// <summary>
+        /// If the vertex shader is emulated on compute, this should be set to the compute program, otherwise it should be null.
+        /// </summary>
+        public ShaderAsCompute VertexAsCompute;
+
+        /// <summary>
+        /// If a geometry shader exists and is emulated on compute, this should be set to the compute program, otherwise it should be null.
+        /// </summary>
+        public ShaderAsCompute GeometryAsCompute;
+
+        /// <summary>
+        /// If the vertex shader is emulated on compute, this should be set to the passthrough vertex program, otherwise it should be null.
+        /// </summary>
+        public IProgram VertexPassthrough;
     }
 }