Support toggling lightmap layers

project/code/LGS/Database/Chunks/WorldRep.cs

@@ -149,57 +149,45 @@ public class WorldRep : IChunk
                 }
             }
 
-            public readonly byte[] AsBytesRgba()
+            public readonly byte[] AsBytesRgba(int layer)
             {
-                var length = Width * Height * 4;
+                if (layer >= Layers)
-                var bytes = new byte[length];
-                for (var i = 0; i < length; i++)
                 {
-                    bytes[i] = 0;
+                    throw new ArgumentOutOfRangeException(nameof(layer));
                 }
 
-                // TODO: might be faster to do these fors in the switch?
+                var length = Width * Height * 4;
-                for (var z = 0; z < Layers; z++)
+                var layerOffset = layer * Bpp * Width * Height;
-                {
+                var bytes = new byte[length];
                 for (var y = 0; y < Height; y++)
                 {
                     for (var x = 0; x < Width; x++)
                     {
-                            var pIdx = 0 + x * Bpp + y * Bpp * Width + z * Bpp * Width * Height;
+                        var bIdx = x * 4 + y * 4 * Width;
-                            var r = 0;
+                        var pIdx = x * Bpp + y * Bpp * Width + layerOffset;
-                            var g = 0;
-                            var b = 0;
-                            var a = 0;
                         switch (Bpp)
                         {
                             case 1:
                                 var raw1 = Pixels[pIdx];
-                                    r = raw1;
+                                bytes[bIdx] = raw1;
-                                    g = raw1;
+                                bytes[bIdx + 1] = raw1;
-                                    b = raw1;
+                                bytes[bIdx + 2] = raw1;
-                                    a = 255;
+                                bytes[bIdx + 3] = 255;
                                 break;
                             case 2:
                                 var raw2 = Pixels[pIdx] + (Pixels[pIdx + 1] << 8);
-                                    r = (int)(255 * (raw2 & 31) / 31.0f);
+                                bytes[bIdx] = (byte)(255 * (raw2 & 31) / 31.0f);
-                                    g = (int)(255 * ((raw2 >> 5) & 31) / 31.0f);
+                                bytes[bIdx + 1] = (byte)(255 * ((raw2 >> 5) & 31) / 31.0f);
-                                    b = (int)(255 * ((raw2 >> 10) & 31) / 31.0f);
+                                bytes[bIdx + 2] = (byte)(255 * ((raw2 >> 10) & 31) / 31.0f);
-                                    a = 255;
+                                bytes[bIdx + 3] = 255;
                                 break;
                             case 4:
-                                    r = Pixels[pIdx + 2];
+                                bytes[bIdx] = Pixels[pIdx + 2];
-                                    g = Pixels[pIdx + 1];
+                                bytes[bIdx + 1] = Pixels[pIdx + 1];
-                                    b = Pixels[pIdx];
+                                bytes[bIdx + 2] = Pixels[pIdx];
-                                    a = Pixels[pIdx + 3];
+                                bytes[bIdx + 3] = Pixels[pIdx + 3];
                                 break;
                         }
-
-                            var bIdx = x * 4 + y * 4 * Width;
-                            bytes[bIdx] = (byte)Math.Min(255, bytes[bIdx] + r);
-                            bytes[bIdx + 1] = (byte)Math.Min(255, bytes[bIdx + 1] + g);
-                            bytes[bIdx + 2] = (byte)Math.Min(255, bytes[bIdx + 2] + b);
-                            bytes[bIdx + 3] = (byte)Math.Min(255, bytes[bIdx + 3] + a);
-                        }
                     }
                 }
 

project/code/TMV/Mission.cs

@@ -45,12 +45,16 @@ public partial class Mission : Node3D
 	DbFile _file;
 	TextureLoader _textureLoader;
 	ModelLoader _modelLoader;
+	List<ShaderMaterial> _materials;
+	Vector2I _lmLayerMask;
 
 	public override void _Ready()
 	{
 		var extractPath = ProjectSettings.GlobalizePath($"user://extracted/tmp");
 		_installPaths = new ResourcePathManager(extractPath);
 		_modelLoader = new ModelLoader(_installPaths);
+		_materials = new List<ShaderMaterial>();
+		_lmLayerMask = new Vector2I(~0, ~0);
 		var missionSelector = GetNode<Control>("%MissionSelector") as MissionSelector;
 		missionSelector.pathManager = _installPaths;
 		missionSelector.MissionSelected += (string campaign, string mission) =>
@@ -84,6 +88,10 @@ public partial class Mission : Node3D
 			{
 				Build = true;
 			}
+			if (keyEvent.Keycode == Key.O)
+			{
+				ToggleLightmap();
+			}
 		}
 	}
 
@@ -93,6 +101,8 @@ public partial class Mission : Node3D
 		{
 			node.QueueFree();
 		}
+
+		_materials.Clear();
 	}
 
 	public void RebuildMap()
@@ -111,6 +121,60 @@ public partial class Mission : Node3D
 		}
 	}
 
+	public void ToggleLightmap()
+	{
+		if (_lmLayerMask == Vector2I.Zero)
+		{
+			_lmLayerMask = new Vector2I(~0, ~0);
+		}
+		else
+		{
+			_lmLayerMask = Vector2I.Zero;
+		}
+
+		foreach (var mat in _materials)
+		{
+			mat.SetShaderParameter("lightmap_bitmask", _lmLayerMask);
+		}
+	}
+
+	public void ToggleLmLayer(uint layer)
+	{
+		if (layer >= 64)
+		{
+			throw new ArgumentOutOfRangeException(nameof(layer));
+		}
+
+		static int ToggleBit(int bitIdx, int val)
+		{
+			var mask = 1 << bitIdx;
+			var isEnabled = (val & mask) != 0;
+			if (isEnabled)
+			{
+				val &= ~mask;
+			}
+			else
+			{
+				val |= mask;
+			}
+			return val;
+		}
+
+		if (layer < 32)
+		{
+			_lmLayerMask.X = ToggleBit((int)layer, _lmLayerMask.X);
+		}
+		else
+		{
+			_lmLayerMask.Y = ToggleBit((int)layer - 32, _lmLayerMask.Y);
+		}
+
+		foreach (var mat in _materials)
+		{
+			mat.SetShaderParameter("lightmap_bitmask", _lmLayerMask);
+		}
+	}
+
 	// TODO: Make this less of a mess
 	private ObjectHierarchy BuildHierarchy()
 	{
@@ -239,10 +303,12 @@ public partial class Mission : Node3D
 			}
 
 			var albedoTexture = _textureLoader.Get(textureId);
+			var mat = BuildMaterial(albedoTexture, lightmapTexture, lmHdr, _lmLayerMask);
+			_materials.Add(mat);
 
 			var mesh = new ArrayMesh();
 			mesh.AddSurfaceFromArrays(Mesh.PrimitiveType.Triangles, surface.BuildSurfaceArray());
-			mesh.SurfaceSetMaterial(0, BuildMaterial(albedoTexture, lightmapTexture, lmHdr));
+			mesh.SurfaceSetMaterial(0, mat);
 
 			var meshInstance = new MeshInstance3D { Mesh = mesh };
 			AddChild(meshInstance);
@@ -282,7 +348,11 @@ public partial class Mission : Node3D
 		return new LightmapRectData(cellIdx, polyIdx, textureId, start, end);
 	}
 
-	private static Texture BuildLightmapTexture(WorldRep.Cell[] cells, PackingRectangle[] packingRects, Dictionary<int, LightmapRectData> rectDataMap, Dictionary<int, MeshSurfaceData> surfaceDataMap)
+	private static Texture2DArray BuildLightmapTexture(
+		WorldRep.Cell[] cells,
+		PackingRectangle[] packingRects,
+		Dictionary<int, LightmapRectData> rectDataMap,
+		Dictionary<int, MeshSurfaceData> surfaceDataMap)
 	{
 		var bounds = Timing.TimeStage("RectPack", () =>
 		{
@@ -290,7 +360,16 @@ public partial class Mission : Node3D
 			return bounds;
 		});
 		GD.Print($"Creating lightmap with bounds: ({bounds.Width}, {bounds.Height})");
-		var image = Image.CreateEmpty((int)bounds.Width, (int)bounds.Height, false, Image.Format.Rgba8);
+
+		var lightmapFormat = Image.Format.Rgba8;
+		var lmLayerCount = 33;
+		var lmImages = new Godot.Collections.Array<Image>();
+		lmImages.Resize(lmLayerCount);
+		for (var i = 0; i < lmLayerCount; i++)
+		{
+			lmImages[i] = Image.CreateEmpty((int)bounds.Width, (int)bounds.Height, false, lightmapFormat);
+		}
+
 		foreach (var rect in packingRects)
 		{
 			if (!rectDataMap.ContainsKey(rect.Id)) GD.Print("Invalid rectDataMap key");
@@ -298,9 +377,18 @@ public partial class Mission : Node3D
 
 			if (info.cellIndex >= cells.Length) GD.Print($"CellIndex too big: {info.cellIndex}/{cells.Length}");
 			if (info.lightmapIndex >= cells[info.cellIndex].Lightmaps.Length) GD.Print($"LightmapIndex too big: {info.lightmapIndex}/{cells[info.cellIndex].Lightmaps.Length}");
+
 			var lightmap = cells[info.cellIndex].Lightmaps[info.lightmapIndex];
-			var cellLm = Image.CreateFromData(lightmap.Width, lightmap.Height, false, Image.Format.Rgba8, lightmap.AsBytesRgba());
+			var width = lightmap.Width;
-			image.BlitRect(cellLm, new Rect2I(0, 0, lightmap.Width, lightmap.Height), new Vector2I((int)rect.X, (int)rect.Y));
+			var height = lightmap.Height;
+			var layerCount = lightmap.Layers;
+			var srcRect = new Rect2I(0, 0, width, height);
+			var dst = new Vector2I((int)rect.X, (int)rect.Y);
+			for (var i = 0; i < layerCount; i++)
+			{
+				var cellLm = Image.CreateFromData(width, height, false, lightmapFormat, lightmap.AsBytesRgba(i));
+				lmImages[i].BlitRect(cellLm, srcRect, dst);
+			}
 
 			if (!surfaceDataMap.ContainsKey(info.textureId)) GD.Print("Invalid SurfaceDataMap key");
 			surfaceDataMap[info.textureId].TransformUv2s(info.uvStart, info.uvEnd, (uv) =>
@@ -321,7 +409,9 @@ public partial class Mission : Node3D
 			});
 		}
 
-		return ImageTexture.CreateFromImage(image);
+		var lightmapTexture = new Texture2DArray();
+		lightmapTexture.CreateFromImages(lmImages);
+		return lightmapTexture;
 	}
 
 	private int CalcBaseUV(
@@ -448,12 +538,17 @@ public partial class Mission : Node3D
 	}
 
 	const string MATERIAL_PATH = "res://project/materials/base.tres";
-	private static Material BuildMaterial(Texture albedoTexture, Texture lightmapTexture, bool lmHdr)
+	private static ShaderMaterial BuildMaterial(
+		Texture2D albedoTexture,
+		Texture2DArray lightmapTexture,
+		bool lmHdr,
+		Vector2I layerMask)
 	{
 		var material = ResourceLoader.Load<ShaderMaterial>(MATERIAL_PATH).Duplicate() as ShaderMaterial;
 		material.SetShaderParameter("texture_albedo", albedoTexture);
 		material.SetShaderParameter("lightmap_albedo", lightmapTexture);
 		material.SetShaderParameter("lightmap_2x", lmHdr);
+		material.SetShaderParameter("lightmap_bitmask", layerMask);
 		return material;
 	}
 }

project/materials/base.tres

@@ -4,8 +4,9 @@
 code = "shader_type spatial;
 render_mode blend_mix,depth_draw_opaque,cull_back,unshaded;
 uniform sampler2D texture_albedo : filter_linear_mipmap_anisotropic,repeat_enable;
-uniform sampler2D lightmap_albedo : filter_linear_mipmap_anisotropic,repeat_enable;
+uniform sampler2DArray lightmap_albedo : filter_linear_mipmap_anisotropic,repeat_enable;
 uniform bool lightmap_2x;
+uniform ivec2 lightmap_bitmask;
 
 float srgb_to_linear_e(float input) {
 	float output;
@@ -28,11 +29,27 @@ vec3 srgb_to_linear(vec3 input) {
 
 void fragment() {
 	vec4 albedo_tex = texture(texture_albedo,UV);
-	vec4 lightmap_tex = texture(lightmap_albedo,UV2);
+	if (lightmap_bitmask.x == 0 && lightmap_bitmask.y == 0) {
+		ALBEDO = srgb_to_linear(albedo_tex.rgb);
+	} else {
+		vec4 lightmap_tex = vec4(0.0);
+		int mask = lightmap_bitmask.x;
+		for (int i = 0; i < 33; i++) {
+			if (i == 32) {
+				mask = lightmap_bitmask.y;
+			}
+			bool layer_enabled = (mask & (1 << (i % 32))) != 0;
+			if (layer_enabled) {
+				lightmap_tex += texture(lightmap_albedo, vec3(UV2, float(i)));
+			}
+		}
+		lightmap_tex = min(vec4(1.0), lightmap_tex);
+		
 		if (lightmap_2x) {
 			lightmap_tex *= 2.0f;
 		}
 		ALBEDO = srgb_to_linear((albedo_tex * lightmap_tex).rgb);
+	}
 }
 "
 
@@ -40,3 +57,4 @@ void fragment() {
 render_priority = 0
 shader = SubResource("Shader_eumy4")
 shader_parameter/lightmap_2x = null
+shader_parameter/lightmap_bitmask = null