Fix shader textureSize with multisample and buffer textures (#3240)

* Fix shader textureSize with multisample and buffer textures

* Replace out param with tuple return value

Ryujinx.Graphics.Shader/CodeGen/Glsl/CodeGenContext.cs

@@ -70,6 +70,25 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Glsl
             AppendLine("}" + suffix);
         }
 
+        public (TextureDescriptor, int) FindTextureDescriptor(AstTextureOperation texOp)
+        {
+            TextureDescriptor[] descriptors = Config.GetTextureDescriptors();
+
+            for (int i = 0; i < descriptors.Length; i++)
+            {
+                var descriptor = descriptors[i];
+
+                if (descriptor.CbufSlot == texOp.CbufSlot &&
+                    descriptor.HandleIndex == texOp.Handle &&
+                    descriptor.Format == texOp.Format)
+                {
+                    return (descriptor, i);
+                }
+            }
+
+            return (default, -1);
+        }
+
         private static int FindDescriptorIndex(TextureDescriptor[] array, AstTextureOperation texOp)
         {
             for (int i = 0; i < array.Length; i++)

Ryujinx.Graphics.Shader/CodeGen/Glsl/Instructions/InstGenMemory.cs

@@ -756,27 +756,34 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Glsl.Instructions
 
             string samplerName = OperandManager.GetSamplerName(context.Config.Stage, texOp, indexExpr);
 
-            int lodSrcIndex = isBindless || isIndexed ? 1 : 0;
-
-            IAstNode lod = operation.GetSource(lodSrcIndex);
-
-            string lodExpr = GetSoureExpr(context, lod, GetSrcVarType(operation.Inst, lodSrcIndex));
-
             if (texOp.Index == 3)
             {
                 return $"textureQueryLevels({samplerName})";
             }
             else
             {
-                string texCall = $"textureSize({samplerName}, {lodExpr}){GetMask(texOp.Index)}";
+                (TextureDescriptor descriptor, int descriptorIndex) = context.FindTextureDescriptor(texOp);
+                bool hasLod = !descriptor.Type.HasFlag(SamplerType.Multisample) && descriptor.Type != SamplerType.TextureBuffer;
+                string texCall;
+
+                if (hasLod)
+                {
+                    int lodSrcIndex = isBindless || isIndexed ? 1 : 0;
+                    IAstNode lod = operation.GetSource(lodSrcIndex);
+                    string lodExpr = GetSoureExpr(context, lod, GetSrcVarType(operation.Inst, lodSrcIndex));
+
+                    texCall = $"textureSize({samplerName}, {lodExpr}){GetMask(texOp.Index)}";
+                }
+                else
+                {
+                    texCall = $"textureSize({samplerName}){GetMask(texOp.Index)}";
+                }
 
                 if (context.Config.Stage.SupportsRenderScale() &&
                     !isBindless &&
                     !isIndexed)
                 {
-                    int index = context.FindTextureDescriptorIndex(texOp);
-
-                    texCall = "Helper_TextureSizeUnscale(" + texCall + ", " + index + ")";
+                    texCall = $"Helper_TextureSizeUnscale({texCall}, {descriptorIndex})";
                 }
 
                 return texCall;