Added lua exporting

Editor/LuaFileAssetEditor.cs

@@ -0,0 +1,15 @@
+using Splashedit.RuntimeCode;
+using UnityEditor;
+using UnityEngine;
+
+[CustomEditor(typeof(LuaFile))]
+public class LuaScriptAssetEditor : Editor
+{
+    public override void OnInspectorGUI()
+    {
+        LuaFile luaScriptAsset = (LuaFile)target;
+        
+        // Allow user to drag-and-drop the Lua file
+        luaScriptAsset.luaScript = (TextAsset)EditorGUILayout.ObjectField("Lua Script", luaScriptAsset.luaScript, typeof(TextAsset), false);
+    }
+}

Editor/LuaFileAssetEditor.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 32c0501d523345500be12e6e4214ec9d

Editor/LuaImporter.cs

@@ -0,0 +1,17 @@
+using UnityEngine;
+using System.IO;
+using UnityEditor.AssetImporters;
+
+namespace SplashEdit.EditorCode
+{
+    [ScriptedImporter(1, "lua")]
+    class LuaImporter : ScriptedImporter
+    {
+        public override void OnImportAsset(AssetImportContext ctx)
+        {
+            var asset = new TextAsset(File.ReadAllText(ctx.assetPath));
+            ctx.AddObjectToAsset("Text", asset);
+            ctx.SetMainObject(asset);
+        }
+    }
+}

Editor/LuaImporter.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: d364a1392e3bccd77aca824ac471f89c

Runtime/LuaFile.cs

@@ -0,0 +1,11 @@
+using UnityEngine;
+
+namespace Splashedit.RuntimeCode
+{
+
+    [CreateAssetMenu(fileName = "NewLuaScript", menuName = "Lua Script", order = 1)]
+    public class LuaFile : ScriptableObject
+    {
+        public TextAsset luaScript;
+    }
+}

Runtime/LuaFile.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: e3b07239f3beb7a87ad987c3fedae9c1

Runtime/PSXObjectExporter.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using Splashedit.RuntimeCode;
 using UnityEngine;
 
 namespace SplashEdit.RuntimeCode
@@ -7,6 +8,7 @@ namespace SplashEdit.RuntimeCode
     public class PSXObjectExporter : MonoBehaviour
     {
         public PSXBPP BitDepth = PSXBPP.TEX_8BIT; // Defines the bit depth of the texture (e.g., 4BPP, 8BPP)
+        public LuaFile luaFile;
 
         public List<PSXTexture2D> Textures { get; set; } = new List<PSXTexture2D>(); // Stores the converted PlayStation-style texture
         public PSXMesh Mesh { get; set; } // Stores the converted PlayStation-style mesh

Runtime/PSXSceneExporter.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using Splashedit.RuntimeCode;
 using UnityEditor;
 using UnityEngine;
 
@@ -83,6 +84,10 @@ namespace SplashEdit.RuntimeCode
             string path = EditorUtility.SaveFilePanel("Select Output File", "", "output", "bin");
             int totalFaces = 0;
 
+            // Lists for lua data offsets.
+            List<long> luaOffsetPlaceholderPositions = new List<long>();
+            List<long> luaDataOffsets = new List<long>();
+
             // Lists for mesh data offsets.
             List<long> meshOffsetPlaceholderPositions = new List<long>();
             List<long> meshDataOffsets = new List<long>();
@@ -100,6 +105,7 @@ namespace SplashEdit.RuntimeCode
             List<long> navmeshDataOffsets = new List<long>();
 
             int clutCount = 0;
+            List<LuaFile> luaFiles = new List<LuaFile>();
 
             // Cluts
             foreach (TextureAtlas atlas in _atlases)
@@ -113,12 +119,26 @@ namespace SplashEdit.RuntimeCode
                 }
             }
 
+            // Lua files 
+            foreach (PSXObjectExporter exporter in _exporters)
+            {
+                if (exporter.luaFile != null)
+                {
+                    //if not contains
+                    if (!luaFiles.Contains(exporter.luaFile))
+                    {
+                        luaFiles.Add(exporter.luaFile);
+                    }
+                }
+            }
+
             using (BinaryWriter writer = new BinaryWriter(File.Open(path, FileMode.Create)))
             {
                 // Header
                 writer.Write('S'); // 1 byte                                                                    // 1
                 writer.Write('P'); // 1 byte                                                                    // 2 
                 writer.Write((ushort)1); // 2 bytes - version                                                   // 4
+                writer.Write((ushort)luaFiles.Count); // 2 bytes - padding                                                      // 6
                 writer.Write((ushort)_exporters.Length); // 2 bytes                                             // 6
                 writer.Write((ushort)_navmeshes.Length);                                                        // 8
                 writer.Write((ushort)_atlases.Length); // 2 bytes                                               // 10
@@ -134,6 +154,16 @@ namespace SplashEdit.RuntimeCode
                 writer.Write((ushort)PSXTrig.ConvertCoordinateToPSX(_playerHeight, GTEScaling));                // 26
 
                 writer.Write((ushort)0);
+                writer.Write((ushort)0);
+
+                // Lua file section
+                foreach (LuaFile luaFile in luaFiles)
+                {
+                    // Write placeholder for lua file data offset and record its position.
+                    luaOffsetPlaceholderPositions.Add(writer.BaseStream.Position);
+                    writer.Write((int)0); // 4-byte placeholder for mesh data offset.
+                    writer.Write((uint)luaFile.luaScript.text.Length);
+                }
 
                 // GameObject section (exporters)
                 foreach (PSXObjectExporter exporter in _exporters)
@@ -159,7 +189,15 @@ namespace SplashEdit.RuntimeCode
                     writer.Write((int)rotationMatrix[2, 2]);
 
                     writer.Write((ushort)exporter.Mesh.Triangles.Count);
-                    writer.Write((ushort)0);
+                    if (exporter.luaFile != null)
+                    {
+                        int index = luaFiles.IndexOf(exporter.luaFile);
+                        writer.Write((short)index);
+                    }
+                    else
+                    {
+                        writer.Write((short)-1);
+                    }
                 }
 
                 // Navmesh metadata section
@@ -205,6 +243,17 @@ namespace SplashEdit.RuntimeCode
 
                 // Start of data section
 
+                // Lua data section: Write lua file data for each exporter.
+                foreach (LuaFile luaFile in luaFiles)
+                {
+                    AlignToFourBytes(writer);
+                    // Record the current offset for this lua file's data.
+                    long luaDataOffset = writer.BaseStream.Position;
+                    luaDataOffsets.Add(luaDataOffset);
+
+                    writer.Write(luaFile.luaScript.bytes);
+                }
+
                 // Mesh data section: Write mesh data for each exporter.
                 foreach (PSXObjectExporter exporter in _exporters)
                 {
@@ -337,6 +386,20 @@ namespace SplashEdit.RuntimeCode
 
                 }
 
+                // Bacfill the lua data offsets into the metadata section.
+                if (luaOffsetPlaceholderPositions.Count == luaDataOffsets.Count)
+                {
+                    for (int i = 0; i < luaOffsetPlaceholderPositions.Count; i++)
+                    {
+                        writer.Seek((int)luaOffsetPlaceholderPositions[i], SeekOrigin.Begin);
+                        writer.Write((int)luaDataOffsets[i]);
+                    }
+                }
+                else
+                {
+                    Debug.LogError("Mismatch between metadata lua offset placeholders and lua data blocks!");
+                }
+
                 // Backfill the mesh data offsets into the metadata section.
                 if (meshOffsetPlaceholderPositions.Count == meshDataOffsets.Count)
                 {

doc/splashbundle.md

@@ -10,24 +10,32 @@ All numeric values are stored in little‐endian format. All offsets are counted
 | ------ | ---- | ------ | ----------------------------------- |
 | 0x00   | 2    | char   | `'SP'` – File magic                 |
 | 0x02   | 2    | uint16 | Version number                      |
-| 0x04   | 2    | uint16 | Number of GameObjects               |
+| 0x04   | 2    | uint16 | Number of Lua Files                 |
-| 0x06   | 2    | uint16 | Number of Navmeshes                 |
+| 0x06   | 2    | uint16 | Number of GameObjects               |
-| 0x08   | 2    | uint16 | Number of Texture Atlases           |
+| 0x08   | 2    | uint16 | Number of Navmeshes                 |
-| 0x0A   | 2    | uint16 | Number of CLUTs                     |
+| 0x0A   | 2    | uint16 | Number of Texture Atlases           |
-| 0x0C   | 2    | uint16 | Player Start X                      |
+| 0x0C   | 2    | uint16 | Number of CLUTs                     |
-| 0x0E   | 2    | uint16 | Player Start Y                      |
+| 0x0E   | 2    | uint16 | Player Start X (Fixed-point)        |
-| 0x10   | 2    | uint16 | Player Start Z                      |
+| 0x10   | 2    | uint16 | Player Start Y (Fixed-point)        |
-| 0x12   | 2    | uint16 | Player Rotation X                   |
+| 0x12   | 2    | uint16 | Player Start Z (Fixed-point)        |
-| 0x14   | 2    | uint16 | Player Rotation Y                   |
+| 0x14   | 2    | uint16 | Player Rotation X (Fixed-point)     |
-| 0x16   | 2    | uint16 | Player Rotation Z                   |
+| 0x16   | 2    | uint16 | Player Rotation Y (Fixed-point)     |
-| 0x18   | 2    | uint16 | Player Height                       |
+| 0x18   | 2    | uint16 | Player Rotation Z (Fixed-point)     |
-| 0x1A   | 2    | uint16 | Reserved (always 0)                 |
+| 0x1A   | 2    | uint16 | Player Height (Fixed-point)         |
+| 0x1C   | 4    | uint32 | Reserved (always 0)                 |
 
 ---
 
 ## 2. Metadata Section
 
-### 2.1 GameObject Descriptors (56 bytes each)
+### 2.1 Lua File Descriptors (8 bytes each)
+
+| Offset (per entry) | Size | Type   | Description                       |
+| ------------------ | ---- | ------ | --------------------------------- |
+| 0x00               | 4    | uint32 | Lua File Data Offset              |
+| 0x04               | 4    | uint32 | Lua File Size                     |
+
+### 2.2 GameObject Descriptors (56 bytes each)
 
 | Offset (per entry) | Size | Type     | Description                       |
 | ------------------ | ---- | -------- | --------------------------------- |
@@ -37,21 +45,17 @@ All numeric values are stored in little‐endian format. All offsets are counted
 | 0x0C               | 4    | int32    | Z position (Fixed-point)          |
 | 0x10               | 36   | int32[9] | 3×3 Rotation Matrix (Fixed-point) |
 | 0x34               | 2    | uint16   | Triangle count                    |
-| 0x36               | 2    | int16    | Padding                           |
+| 0x36               | 2    | int16    | Lua File Index (-1 if none)       |
 
-> Mesh data for each GameObject is located at `meshDataOffset`.
+### 2.3 Navmesh Descriptors (8 bytes each)
-
-### 2.2 Navmesh Descriptors (8 bytes each)
 
 | Offset (per entry) | Size | Type   | Description                       |
 | ------------------ | ---- | ------ | --------------------------------- |
 | 0x00               | 4    | uint32 | Navmesh Data Offset               |
-| 0x04               | 2    | int16  | Triangle count                    |
+| 0x04               | 2    | uint16 | Triangle count                    |
-| 0x06               | 2    | int16  | Padding                           |
+| 0x06               | 2    | uint16 | Padding                           |
 
-> Each triangle in a navmesh is defined by 3 `int16` vertices (6 bytes per vertex).
+### 2.4 Texture Atlas Descriptors (12 bytes each)
-
-### 2.3 Texture Atlas Descriptors (12 bytes each)
 
 | Offset (per entry) | Size | Type   | Description                      |
 | ------------------ | ---- | ------ | -------------------------------- |
@@ -61,9 +65,7 @@ All numeric values are stored in little‐endian format. All offsets are counted
 | 0x08               | 2    | uint16 | Atlas Position X (VRAM origin)   |
 | 0x0A               | 2    | uint16 | Atlas Position Y (VRAM origin)   |
 
-> Pixel data is stored as `uint16[width * height]`.
+### 2.5 CLUT Descriptors (12 bytes each)
-
-### 2.4 CLUT Descriptors (12 bytes each)
 
 | Offset (per entry) | Size | Type   | Description                                           |
 | ------------------ | ---- | ------ | ----------------------------------------------------- |
@@ -73,13 +75,17 @@ All numeric values are stored in little‐endian format. All offsets are counted
 | 0x08               | 2    | uint16 | Palette entry count                                   |
 | 0x0A               | 2    | uint16 | Padding                                               |
 
-> CLUT pixel data is stored as `uint16[length]`.
-
 ---
 
 ## 3. Data Section
 
-### 3.1 Mesh Data Block (per GameObject)
+### 3.1 Lua Data Block
+
+Each Lua file is stored as raw bytes. The size of each Lua file is specified in the Lua File Descriptor.
+
+---
+
+### 3.2 Mesh Data Block (per GameObject)
 
 Each mesh is made of triangles:
 
@@ -105,20 +111,27 @@ Each mesh is made of triangles:
 
 ---
 
-### 3.2 Navmesh Data Block
+### 3.3 Navmesh Data Block
 
 Each triangle is 3 vertices (`int16` x/y/z), total 18 bytes per triangle.
 
 ---
 
-### 3.3 Texture Atlas Data Block
+### 3.4 Texture Atlas Data Block
 
 Pixel data stored as `uint16[width * height]`.
 
 ---
 
-### 3.4 CLUT Data Block
+### 3.5 CLUT Data Block
 
 Pixel data stored as `uint16[length]`.
 
 ---
+
+## Notes
+
+- All offsets are aligned to 4-byte boundaries.
+- Fixed-point values are scaled by the `GTEScaling` factor.
+- Lua file indices in GameObject descriptors are `-1` if no Lua file is associated with the object.
+- Navmesh triangles are stored as raw vertex data without additional attributes.