Allow SNorm buffer texture formats on Vulkan (#3957)

* Allow SNorm buffer texture formats on Vulkan

* Shader cache version bump

Ryujinx.Graphics.GAL/Capabilities.cs

@@ -17,6 +17,7 @@ namespace Ryujinx.Graphics.GAL
         public readonly bool Supports3DTextureCompression;
         public readonly bool SupportsBgraFormat;
         public readonly bool SupportsR4G4Format;
+        public readonly bool SupportsSnormBufferTextureFormat;
         public readonly bool SupportsFragmentShaderInterlock;
         public readonly bool SupportsFragmentShaderOrderingIntel;
         public readonly bool SupportsGeometryShaderPassthrough;
@@ -52,6 +53,7 @@ namespace Ryujinx.Graphics.GAL
             bool supports3DTextureCompression,
             bool supportsBgraFormat,
             bool supportsR4G4Format,
+            bool supportsSnormBufferTextureFormat,
             bool supportsFragmentShaderInterlock,
             bool supportsFragmentShaderOrderingIntel,
             bool supportsGeometryShaderPassthrough,
@@ -84,6 +86,7 @@ namespace Ryujinx.Graphics.GAL
             Supports3DTextureCompression = supports3DTextureCompression;
             SupportsBgraFormat = supportsBgraFormat;
             SupportsR4G4Format = supportsR4G4Format;
+            SupportsSnormBufferTextureFormat = supportsSnormBufferTextureFormat;
             SupportsFragmentShaderInterlock = supportsFragmentShaderInterlock;
             SupportsFragmentShaderOrderingIntel = supportsFragmentShaderOrderingIntel;
             SupportsGeometryShaderPassthrough = supportsGeometryShaderPassthrough;

Ryujinx.Graphics.Gpu/Image/TextureCache.cs

@@ -1088,10 +1088,9 @@ namespace Ryujinx.Graphics.Gpu.Image
         {
             FormatInfo formatInfo = TextureCompatibility.ToHostCompatibleFormat(info, caps);
 
-            if (info.Target == Target.TextureBuffer)
+            if (info.Target == Target.TextureBuffer && !caps.SupportsSnormBufferTextureFormat)
             {
-                // We assume that the host does not support signed normalized format
-                // (as is the case with OpenGL), so we just use a unsigned format.
+                // If the host does not support signed normalized formats, we use a signed integer format instead.
                 // The shader will need the appropriate conversion code to compensate.
                 switch (formatInfo.Format)
                 {

Ryujinx.Graphics.Gpu/Shader/DiskCache/DiskCacheHostStorage.cs

@@ -22,7 +22,7 @@ namespace Ryujinx.Graphics.Gpu.Shader.DiskCache
         private const ushort FileFormatVersionMajor = 1;
         private const ushort FileFormatVersionMinor = 2;
         private const uint FileFormatVersionPacked = ((uint)FileFormatVersionMajor << 16) | FileFormatVersionMinor;
-        private const uint CodeGenVersion = 3943;
+        private const uint CodeGenVersion = 3957;
 
         private const string SharedTocFileName = "shared.toc";
         private const string SharedDataFileName = "shared.data";

Ryujinx.Graphics.Gpu/Shader/GpuAccessorBase.cs

@@ -134,6 +134,8 @@ namespace Ryujinx.Graphics.Gpu.Shader
 
         public bool QueryHostSupportsShaderBallot() => _context.Capabilities.SupportsShaderBallot;
 
+        public bool QueryHostSupportsSnormBufferTextureFormat() => _context.Capabilities.SupportsSnormBufferTextureFormat;
+
         public bool QueryHostSupportsTextureShadowLod() => _context.Capabilities.SupportsTextureShadowLod;
 
         public bool QueryHostSupportsViewportIndex() => _context.Capabilities.SupportsViewportIndex;

Ryujinx.Graphics.OpenGL/OpenGLRenderer.cs

@@ -113,6 +113,7 @@ namespace Ryujinx.Graphics.OpenGL
                 supports3DTextureCompression: false,
                 supportsBgraFormat: false,
                 supportsR4G4Format: false,
+                supportsSnormBufferTextureFormat: false,
                 supportsFragmentShaderInterlock: HwCapabilities.SupportsFragmentShaderInterlock,
                 supportsFragmentShaderOrderingIntel: HwCapabilities.SupportsFragmentShaderOrdering,
                 supportsGeometryShaderPassthrough: HwCapabilities.SupportsGeometryShaderPassthrough,

Ryujinx.Graphics.Shader/IGpuAccessor.cs

@@ -285,6 +285,15 @@ namespace Ryujinx.Graphics.Shader
             return true;
         }
 
+        /// <summary>
+        /// Queries host GPU support for signed normalized buffer texture formats.
+        /// </summary>
+        /// <returns>True if the GPU and driver supports the formats, false otherwise</returns>
+        bool QueryHostSupportsSnormBufferTextureFormat()
+        {
+            return true;
+        }
+
         /// <summary>
         /// Queries host GPU texture shadow LOD support.
         /// </summary>

Ryujinx.Graphics.Shader/Translation/Rewriter.cs

@@ -14,6 +14,7 @@ namespace Ryujinx.Graphics.Shader.Translation
         {
             bool isVertexShader = config.Stage == ShaderStage.Vertex;
             bool hasConstantBufferDrawParameters = config.GpuAccessor.QueryHasConstantBufferDrawParameters();
+            bool supportsSnormBufferTextureFormat = config.GpuAccessor.QueryHostSupportsSnormBufferTextureFormat();
 
             for (int blkIndex = 0; blkIndex < blocks.Length; blkIndex++)
             {
@@ -52,7 +53,7 @@ namespace Ryujinx.Graphics.Shader.Translation
                         {
                             node = RewriteTextureSample(node, config);
 
-                            if (texOp.Type == SamplerType.TextureBuffer)
+                            if (texOp.Type == SamplerType.TextureBuffer && !supportsSnormBufferTextureFormat)
                             {
                                 node = InsertSnormNormalization(node, config);
                             }

Ryujinx.Graphics.Vulkan/VulkanRenderer.cs

@@ -402,6 +402,7 @@ namespace Ryujinx.Graphics.Vulkan
                 supports3DTextureCompression: true,
                 supportsBgraFormat: true,
                 supportsR4G4Format: false,
+                supportsSnormBufferTextureFormat: true,
                 supportsFragmentShaderInterlock: Capabilities.SupportsFragmentShaderInterlock,
                 supportsFragmentShaderOrderingIntel: false,
                 supportsGeometryShaderPassthrough: Capabilities.SupportsGeometryShaderPassthrough,