Implement scaled vertex format emulation (#5564)

* Implement scaled vertex format emulation

* Auto-format (whitespace)

* Delete ToVec4Type

src/Ryujinx.Graphics.Shader/AttributeType.cs

@@ -9,6 +9,8 @@ namespace Ryujinx.Graphics.Shader
         Float,
         Sint,
         Uint,
+        Sscaled,
+        Uscaled,
     }
 
     static class AttributeTypeExtensions
@@ -23,5 +25,18 @@ namespace Ryujinx.Graphics.Shader
                 _ => throw new ArgumentException($"Invalid attribute type \"{type}\"."),
             };
         }
+
+        public static AggregateType ToAggregateType(this AttributeType type, bool supportsScaledFormats)
+        {
+            return type switch
+            {
+                AttributeType.Float => AggregateType.FP32,
+                AttributeType.Sint => AggregateType.S32,
+                AttributeType.Uint => AggregateType.U32,
+                AttributeType.Sscaled => supportsScaledFormats ? AggregateType.FP32 : AggregateType.S32,
+                AttributeType.Uscaled => supportsScaledFormats ? AggregateType.FP32 : AggregateType.U32,
+                _ => throw new ArgumentException($"Invalid attribute type \"{type}\"."),
+            };
+        }
     }
 }

src/Ryujinx.Graphics.Shader/IGpuAccessor.cs

@@ -266,6 +266,15 @@ namespace Ryujinx.Graphics.Shader
             return true;
         }
 
+        /// <summary>
+        /// Queries host support scaled vertex formats, where a integer value is converted to floating-point.
+        /// </summary>
+        /// <returns>True if the host support scaled vertex formats, false otherwise</returns>
+        bool QueryHostSupportsScaledVertexFormats()
+        {
+            return true;
+        }
+
         /// <summary>
         /// Queries host GPU shader ballot support.
         /// </summary>

src/Ryujinx.Graphics.Shader/Instructions/InstEmitAttribute.cs

@@ -61,7 +61,31 @@ namespace Ryujinx.Graphics.Shader.Instructions
                     }
                     else
                     {
-                        context.Copy(Register(rd), AttributeMap.GenerateAttributeLoad(context, primVertex, offset, isOutput, op.P));
+                        value = AttributeMap.GenerateAttributeLoad(context, primVertex, offset, isOutput, op.P);
+
+                        if (!context.TranslatorContext.Definitions.SupportsScaledVertexFormats &&
+                            context.TranslatorContext.Stage == ShaderStage.Vertex &&
+                            !op.O &&
+                            offset >= 0x80 &&
+                            offset < 0x280)
+                        {
+                            // The host does not support scaled vertex formats,
+                            // the emulator should use a integer format, and
+                            // we compensate here inserting the conversion to float.
+
+                            AttributeType type = context.TranslatorContext.Definitions.GetAttributeType((offset - 0x80) >> 4);
+
+                            if (type == AttributeType.Sscaled)
+                            {
+                                value = context.IConvertS32ToFP32(value);
+                            }
+                            else if (type == AttributeType.Uscaled)
+                            {
+                                value = context.IConvertU32ToFP32(value);
+                            }
+                        }
+
+                        context.Copy(Register(rd), value);
                     }
                 }
                 else

src/Ryujinx.Graphics.Shader/Translation/ShaderDefinitions.cs

@@ -53,6 +53,8 @@ namespace Ryujinx.Graphics.Shader.Translation
         public bool OmapSampleMask { get; }
         public bool OmapDepth { get; }
 
+        public bool SupportsScaledVertexFormats { get; }
+
         public bool TransformFeedbackEnabled { get; }
 
         private readonly TransformFeedbackOutput[] _transformFeedbackOutputs;
@@ -139,6 +141,7 @@ namespace Ryujinx.Graphics.Shader.Translation
             int omapTargets,
             bool omapSampleMask,
             bool omapDepth,
+            bool supportsScaledVertexFormats,
             bool transformFeedbackEnabled,
             ulong transformFeedbackVecMap,
             TransformFeedbackOutput[] transformFeedbackOutputs)
@@ -154,6 +157,7 @@ namespace Ryujinx.Graphics.Shader.Translation
             OmapSampleMask = omapSampleMask;
             OmapDepth = omapDepth;
             LastInVertexPipeline = stage < ShaderStage.Fragment;
+            SupportsScaledVertexFormats = supportsScaledVertexFormats;
             TransformFeedbackEnabled = transformFeedbackEnabled;
             _transformFeedbackOutputs = transformFeedbackOutputs;
             _transformFeedbackDefinitions = new();
@@ -302,7 +306,7 @@ namespace Ryujinx.Graphics.Shader.Translation
 
             if (Stage == ShaderStage.Vertex && !isOutput)
             {
-                type |= _graphicsState.AttributeTypes[location].ToAggregateType();
+                type |= _graphicsState.AttributeTypes[location].ToAggregateType(SupportsScaledVertexFormats);
             }
             else
             {
@@ -311,5 +315,10 @@ namespace Ryujinx.Graphics.Shader.Translation
 
             return type;
         }
+
+        public AttributeType GetAttributeType(int location)
+        {
+            return _graphicsState.AttributeTypes[location];
+        }
     }
 }

src/Ryujinx.Graphics.Shader/Translation/Translator.cs

@@ -116,6 +116,7 @@ namespace Ryujinx.Graphics.Shader.Translation
                 header.OmapTargets,
                 header.OmapSampleMask,
                 header.OmapDepth,
+                gpuAccessor.QueryHostSupportsScaledVertexFormats(),
                 transformFeedbackEnabled,
                 transformFeedbackVecMap,
                 transformFeedbackOutputs);