Initial tessellation shader support (#2534)

* Initial tessellation shader support

* Nits

* Re-arrange built-in table

* This is not needed anymore

* PR feedback

Ryujinx.Graphics.Gpu/Shader/Cache/CacheHelper.cs

@@ -349,6 +349,26 @@ namespace Ryujinx.Graphics.Gpu.Shader.Cache
             return flags;
         }
 
+        /// <summary>
+        /// Packs the tessellation parameters from the gpu accessor.
+        /// </summary>
+        /// <param name="gpuAccessor">The gpu accessor</param>
+        /// <returns>The packed tessellation parameters</returns>
+        private static byte GetTessellationModePacked(IGpuAccessor gpuAccessor)
+        {
+            byte value;
+
+            value = (byte)((int)gpuAccessor.QueryTessPatchType() & 3);
+            value |= (byte)(((int)gpuAccessor.QueryTessSpacing() & 3) << 2);
+
+            if (gpuAccessor.QueryTessCw())
+            {
+                value |= 0x10;
+            }
+
+            return value;
+        }
+
         /// <summary>
         /// Create a new instance of <see cref="GuestGpuAccessorHeader"/> from an gpu accessor.
         /// </summary>
@@ -364,6 +384,7 @@ namespace Ryujinx.Graphics.Gpu.Shader.Cache
                 ComputeLocalMemorySize = gpuAccessor.QueryComputeLocalMemorySize(),
                 ComputeSharedMemorySize = gpuAccessor.QueryComputeSharedMemorySize(),
                 PrimitiveTopology = gpuAccessor.QueryPrimitiveTopology(),
+                TessellationModePacked = GetTessellationModePacked(gpuAccessor),
                 StateFlags = GetGpuStateFlags(gpuAccessor)
             };
         }

Ryujinx.Graphics.Gpu/Shader/Cache/Definition/GuestGpuAccessorHeader.cs

@@ -49,10 +49,15 @@ namespace Ryujinx.Graphics.Gpu.Shader.Cache.Definition
         /// </summary>
         public InputTopology PrimitiveTopology;
 
+        /// <summary>
+        /// Tessellation parameters (packed to fit on a byte).
+        /// </summary>
+        public byte TessellationModePacked;
+
         /// <summary>
         /// Unused/reserved.
         /// </summary>
-        public ushort Reserved2;
+        public byte Reserved2;
 
         /// <summary>
         /// GPU boolean state that can influence shader compilation.

Ryujinx.Graphics.Gpu/Shader/CachedGpuAccessor.cs

@@ -134,6 +134,33 @@ namespace Ryujinx.Graphics.Gpu.Shader
             return _header.PrimitiveTopology;
         }
 
+        /// <summary>
+        /// Queries the tessellation evaluation shader primitive winding order.
+        /// </summary>
+        /// <returns>True if the primitive winding order is clockwise, false if counter-clockwise</returns>
+        public bool QueryTessCw()
+        {
+            return (_header.TessellationModePacked & 0x10) != 0;
+        }
+
+        /// <summary>
+        /// Queries the tessellation evaluation shader abstract patch type.
+        /// </summary>
+        /// <returns>Abstract patch type</returns>
+        public TessPatchType QueryTessPatchType()
+        {
+            return (TessPatchType)(_header.TessellationModePacked & 3);
+        }
+
+        /// <summary>
+        /// Queries the tessellation evaluation shader spacing between tessellated vertices of the patch.
+        /// </summary>
+        /// <returns>Spacing between tessellated vertices of the patch</returns>
+        public TessSpacing QueryTessSpacing()
+        {
+            return (TessSpacing)((_header.TessellationModePacked >> 2) & 3);
+        }
+
         /// <summary>
         /// Gets the texture descriptor for a given texture on the pool.
         /// </summary>

Ryujinx.Graphics.Gpu/Shader/GpuAccessor.cs

@@ -168,10 +168,31 @@ namespace Ryujinx.Graphics.Gpu.Shader
                 PrimitiveTopology.TriangleFan => InputTopology.Triangles,
                 PrimitiveTopology.TrianglesAdjacency or
                 PrimitiveTopology.TriangleStripAdjacency => InputTopology.TrianglesAdjacency,
-                _ => InputTopology.Points,
+                PrimitiveTopology.Patches => _state.TessellationMode.UnpackPatchType() == TessPatchType.Isolines
+                    ? InputTopology.Lines
+                    : InputTopology.Triangles,
+                _ => InputTopology.Points
             };
         }
 
+        /// <summary>
+        /// Queries the tessellation evaluation shader primitive winding order.
+        /// </summary>
+        /// <returns>True if the primitive winding order is clockwise, false if counter-clockwise</returns>
+        public bool QueryTessCw() => _state.TessellationMode.UnpackCw();
+
+        /// <summary>
+        /// Queries the tessellation evaluation shader abstract patch type.
+        /// </summary>
+        /// <returns>Abstract patch type</returns>
+        public TessPatchType QueryTessPatchType() => _state.TessellationMode.UnpackPatchType();
+
+        /// <summary>
+        /// Queries the tessellation evaluation shader spacing between tessellated vertices of the patch.
+        /// </summary>
+        /// <returns>Spacing between tessellated vertices of the patch</returns>
+        public TessSpacing QueryTessSpacing() => _state.TessellationMode.UnpackSpacing();
+
         /// <summary>
         /// Gets the texture descriptor for a given texture on the pool.
         /// </summary>

Ryujinx.Graphics.Gpu/Shader/GpuAccessorState.cs

@@ -1,4 +1,5 @@
 using Ryujinx.Graphics.GAL;
+using Ryujinx.Graphics.Gpu.Engine.Threed;
 
 namespace Ryujinx.Graphics.Gpu.Shader
 {
@@ -32,6 +33,11 @@ namespace Ryujinx.Graphics.Gpu.Shader
         /// </summary>
         public PrimitiveTopology Topology { get; }
 
+        /// <summary>
+        /// Tessellation mode.
+        /// </summary>
+        public TessMode TessellationMode { get; }
+
         /// <summary>
         /// Creates a new instance of the GPU accessor state.
         /// </summary>
@@ -40,18 +46,21 @@ namespace Ryujinx.Graphics.Gpu.Shader
         /// <param name="textureBufferIndex">Constant buffer slot where the texture handles are located</param>
         /// <param name="earlyZForce">Early Z force enable</param>
         /// <param name="topology">Primitive topology</param>
+        /// <param name="tessellationMode">Tessellation mode</param>
         public GpuAccessorState(
             ulong texturePoolGpuVa,
             int texturePoolMaximumId,
             int textureBufferIndex,
             bool earlyZForce,
-            PrimitiveTopology topology)
+            PrimitiveTopology topology,
+            TessMode tessellationMode)
         {
             TexturePoolGpuVa = texturePoolGpuVa;
             TexturePoolMaximumId = texturePoolMaximumId;
             TextureBufferIndex = textureBufferIndex;
             EarlyZForce = earlyZForce;
             Topology = topology;
+            TessellationMode = tessellationMode;
         }
     }
 }

Ryujinx.Graphics.Gpu/Shader/ShaderCache.cs

@@ -40,7 +40,7 @@ namespace Ryujinx.Graphics.Gpu.Shader
         /// <summary>
         /// Version of the codegen (to be changed when codegen or guest format change).
         /// </summary>
-        private const ulong ShaderCodeGenVersion = 2702;
+        private const ulong ShaderCodeGenVersion = 2534;
 
         // Progress reporting helpers
         private volatile int _shaderCount;