From d512ce122cb1c9a7fe7cb40d3f85d642ee37f897 Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Mon, 18 Oct 2021 18:38:04 -0300
Subject: 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    | 21 +++++++++++++++++++++
 .../Cache/Definition/GuestGpuAccessorHeader.cs      |  7 ++++++-
 2 files changed, 27 insertions(+), 1 deletion(-)

(limited to 'Ryujinx.Graphics.Gpu/Shader/Cache')

diff --git a/Ryujinx.Graphics.Gpu/Shader/Cache/CacheHelper.cs b/Ryujinx.Graphics.Gpu/Shader/Cache/CacheHelper.cs
index 33da42db..09107346 100644
--- a/Ryujinx.Graphics.Gpu/Shader/Cache/CacheHelper.cs
+++ b/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)
             };
         }
diff --git a/Ryujinx.Graphics.Gpu/Shader/Cache/Definition/GuestGpuAccessorHeader.cs b/Ryujinx.Graphics.Gpu/Shader/Cache/Definition/GuestGpuAccessorHeader.cs
index 610b2da1..2e044750 100644
--- a/Ryujinx.Graphics.Gpu/Shader/Cache/Definition/GuestGpuAccessorHeader.cs
+++ b/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.
-- 
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