Allow resetting material variable

GlitchyEngine/src/Renderer/Material.bf

@@ -248,6 +248,18 @@ public class Material : Asset
 		return .Ok;
 	}
 
+	public Result<void, SetVariableError> ResetVariable(StringView name)
+	{
+		if(!_variables.TryGetValue(name, let variable))
+		{
+			return .Err(.VariableNotFound);
+		}
+
+		variable.IsUnset = true;
+
+		return .Ok;
+	}
+
 	public void SetVariable(StringView name, bool value) => SetVariable!(name, value);
 	public void SetVariable(StringView name, bool2 value) => SetVariable!(name, value);
 	public void SetVariable(StringView name, bool3 value) => SetVariable!(name, value);

GlitchyEngine/src/Scripting/ScriptGlue.bf

@@ -1059,11 +1059,13 @@ static class ScriptGlue
 
 		if (!material.IsRuntimeInstance)
 		{
-			material = new Material(material, true);
+			using (material = new Material(material, true))
+			{
 				material.Identifier = scope $"(Instance) {material.Identifier}";
 				Content.ManageAsset(material);
 				spriteRenderer.Material = material.Handle;
 			}
+		}
 
 		assetId = spriteRenderer.Material;
 	}
@@ -1178,11 +1180,13 @@ static class ScriptGlue
 		
 		if (!material.IsRuntimeInstance)
 		{
-			material = new Material(material, true);
+			using (material = new Material(material, true))
+			{
 				material.Identifier = scope $"(Instance) {material.Identifier}";
 				Content.ManageAsset(material);
 				meshRenderer.Material = material.Handle;
 			}
+		}
 
 		assetId = meshRenderer.Material;
 	}
@@ -1420,11 +1424,22 @@ static class ScriptGlue
 		Material material = GetAssetOrThrow!<Material>(assetHandle);
 
 		char8* rawVariableName = Mono.mono_string_to_utf8(managedVariableName);
-		defer Mono.mono_free(rawVariableName);
 
-		StringView variableName = StringView(rawVariableName);
+		material.[Friend]SetVariableRaw(StringView(rawVariableName), elementType, rows, columns , arrayLength, Span<uint8>(rawData, dataLength));
 
-		material.[Friend]SetVariableRaw(variableName, elementType, rows, columns , arrayLength, Span<uint8>(rawData, dataLength));
+		Mono.mono_free(rawVariableName);
+	}
+
+	[RegisterCall("ScriptGlue::Material_ResetVariable")]
+	static void Material_ResetVariable(AssetHandle assetHandle, MonoString* managedVariableName)
+	{
+		Material material = GetAssetOrThrow!<Material>(assetHandle);
+
+		char8* rawVariableName = Mono.mono_string_to_utf8(managedVariableName);
+
+		material.ResetVariable(StringView(rawVariableName));
+
+		Mono.mono_free(rawVariableName);
 	}
 
 #endregion

ScriptCore/Graphics/Material.cs

@@ -15,4 +15,9 @@ public class Material : Asset
             ScriptGlue.Material_SetVariable(_uuid, name, ScriptGlue.ShaderVariableType.Float, 1, 4, 1, &value, sizeof(float4));
         }
     }
+
+    public void ResetVariable(string name)
+    {
+        ScriptGlue.Material_ResetVariable(_uuid, name);
+    }
 }

ScriptCore/ScriptGlue.cs

@@ -399,7 +399,10 @@ internal static class ScriptGlue
     }
 
     [MethodImpl(MethodImplOptions.InternalCall)]
-    internal static extern unsafe bool Material_SetVariable(UUID assetId, String variableName, ShaderVariableType elementType, int rows, int columns, int arrayLength, void* rawData, int dataLength);
+    internal static extern unsafe bool Material_SetVariable(UUID assetId, string variableName, ShaderVariableType elementType, int rows, int columns, int arrayLength, void* rawData, int dataLength);
+
+    [MethodImpl(MethodImplOptions.InternalCall)]
+    internal static extern bool Material_ResetVariable(UUID assetId, string variableName);
 
 #endregion