Fixed a stupid issue where GameCube models actually aren't meant to u…

…pdate the alpha channel.

FinModelUtility/Fin/Fin.Ui/src/rendering/gl/model/MergedMaterialPrimitivesAcrossMeshesRenderer.cs

@@ -88,6 +88,8 @@ public class MergedMaterialPrimitivesAcrossMeshesRenderer : IDisposable {
         this.material_?.DepthMode ?? DepthMode.USE_DEPTH_BUFFER,
         this.material_?.DepthCompareType ??
         DepthCompareType.LEqual);
+    GlUtil.SetChannelUpdateMask(this.material_?.UpdateColorChannel ?? true,
+                                this.material_?.UpdateAlphaChannel ?? true);
 
     this.bufferRenderer_.Render();
   }

FinModelUtility/Fin/Fin.Ui/src/rendering/gl/model/MergedMaterialPrimitivesByMeshRenderer.cs

@@ -88,6 +88,8 @@ public class MergedMaterialPrimitivesByMeshRenderer : IDisposable {
         this.material_?.DepthMode ?? DepthMode.USE_DEPTH_BUFFER,
         this.material_?.DepthCompareType ??
         DepthCompareType.LEqual);
+    GlUtil.SetChannelUpdateMask(this.material_?.UpdateColorChannel ?? true,
+                                this.material_?.UpdateAlphaChannel ?? true);
 
     this.bufferRenderer_.Render();
   }

FinModelUtility/Fin/Fin.Ui/src/rendering/gl/util/GlUtil_Channel.cs

@@ -0,0 +1,28 @@
+using System.Runtime.CompilerServices;
+
+using OpenTK.Graphics.OpenGL;
+
+namespace fin.ui.rendering.gl;
+
+public partial class GlState {
+  public bool UpdateColorChannel { get; set; } = true;
+  public bool UpdateAlphaChannel { get; set; } = true;
+}
+
+public static partial class GlUtil {
+  [MethodImpl(MethodImplOptions.AggressiveInlining)]
+  public static void SetChannelUpdateMask(bool updateColorChannel,
+                                          bool updateAlphaChannel) {
+    if (GlUtil.currentState_.UpdateColorChannel == updateColorChannel &&
+        GlUtil.currentState_.UpdateAlphaChannel == updateAlphaChannel) {
+      return;
+    }
+
+    GlUtil.currentState_.UpdateColorChannel = updateColorChannel;
+    GlUtil.currentState_.UpdateAlphaChannel = updateAlphaChannel;
+    GL.ColorMask(updateColorChannel,
+                 updateColorChannel,
+                 updateColorChannel,
+                 updateAlphaChannel);
+  }
+}

FinModelUtility/Fin/Fin/src/model/MaterialInterfaces.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Drawing;
 using System.IO;
 
@@ -66,7 +67,6 @@ public enum DepthCompareType {
   Never,
 }
 
-
 [GenerateReadOnly]
 public partial interface IMaterial {
   string? Name { get; set; }
@@ -82,6 +82,9 @@ public partial interface IMaterial {
   float Shininess { get; set; }
 
   TransparencyType TransparencyType { get; set; }
+
+  bool UpdateColorChannel { get; set; }
+  bool UpdateAlphaChannel { get; set; }
 }
 
 [GenerateReadOnly]

FinModelUtility/Fin/Fin/src/model/impl/material/BMaterialImpl.cs

@@ -21,5 +21,8 @@ private abstract class BMaterialImpl : IMaterial {
 
     public TransparencyType TransparencyType { get; set; }
       = TransparencyType.MASK;
+
+    public bool UpdateColorChannel { get; set; } = true;
+    public bool UpdateAlphaChannel { get; set; } = true;
   }
 }

FinModelUtility/Formats/Gx/src/impl/GxFixedFunctionMaterial.cs

@@ -47,6 +47,7 @@ public partial class GxFixedFunctionMaterial {
             GxCullMode.All   => CullingMode.SHOW_NEITHER,
             _                => throw new ArgumentOutOfRangeException(),
         };
+    material.UpdateAlphaChannel = false;
 
     var depthFunction = populatedMaterial.DepthFunction;
     material.DepthMode =