inject: introduce OBJECT_3D editor

This adds the ability to edit OBJECT_3Ds (static mesh properties). It
alos addresses potential memory corruption in the scenario where a new
data type is present in an injection but it is being loaded into a
version of the game that doesn't recognise it.

src/libtrx/game/inject/common.c

@@ -125,7 +125,9 @@ static void M_InitialiseBlock(VFILE *const file)
     const INJECTION_DATA_TYPE data_type = VFile_ReadS32(file);
     const int32_t data_count = VFile_ReadS32(file);
     const int32_t data_size = VFile_ReadS32(file);
-    m_DataCounts[data_type] += data_count;
+    if (data_type >= 0 && data_type < IDT_NUMBER_OF) {
+        m_DataCounts[data_type] += data_count;
+    }
 
     switch (data_type) {
     case IDT_ROOM_EDIT_META: {

src/libtrx/game/inject/editors/meshes.c

@@ -37,6 +37,9 @@ static void M_ApplyFace3Edit(
     const FACE_EDIT *edit, FACE3 *faces, uint16_t texture);
 static uint16_t *M_GetMeshTexture(const FACE_EDIT *edit);
 
+static void M_Object3DEdits(const INJECTION *injection, int32_t data_count);
+static BOUNDS_16 M_ReadBounds16(VFILE *file);
+
 static void M_MeshEdits(
     const INJECTION *const injection, const int32_t data_count)
 {
@@ -207,4 +210,39 @@ static uint16_t *M_GetMeshTexture(const FACE_EDIT *const edit)
     return nullptr;
 }
 
+static void M_Object3DEdits(
+    const INJECTION *const injection, const int32_t data_count)
+{
+    for (int32_t i = 0; i < data_count; i++) {
+        const int32_t obj_id = VFile_ReadS32(injection->fp);
+        const bool collidable = VFile_ReadU8(injection->fp) == 1;
+        const bool visible = VFile_ReadU8(injection->fp) == 1;
+        const BOUNDS_16 collision_bounds = M_ReadBounds16(injection->fp);
+        const BOUNDS_16 draw_bounds = M_ReadBounds16(injection->fp);
+
+        STATIC_OBJECT_3D *const obj = Object_Get3DStatic(obj_id);
+        if (!obj->loaded) {
+            continue;
+        }
+
+        obj->collidable = collidable;
+        obj->visible = visible;
+        obj->collision_bounds = collision_bounds;
+        obj->draw_bounds = draw_bounds;
+    }
+}
+
+static BOUNDS_16 M_ReadBounds16(VFILE *const file)
+{
+    BOUNDS_16 bounds = {};
+    bounds.min.x = VFile_ReadS16(file);
+    bounds.max.x = VFile_ReadS16(file);
+    bounds.min.y = VFile_ReadS16(file);
+    bounds.max.y = VFile_ReadS16(file);
+    bounds.min.z = VFile_ReadS16(file);
+    bounds.max.z = VFile_ReadS16(file);
+    return bounds;
+}
+
 REGISTER_INJECT_EDITOR(IDT_MESH_EDITS, M_MeshEdits)
+REGISTER_INJECT_EDITOR(IDT_OBJECT_3D_EDITS, M_Object3DEdits)

src/libtrx/include/libtrx/game/inject/enum.h

@@ -65,7 +65,8 @@ typedef enum {
     IDT_VIS_PORTAL_EDITS = 23,
     IDT_CAMERA_EDITS     = 24,
     IDT_FRAME_EDITS      = 25,
-    IDT_NUMBER_OF        = 26,
+    IDT_OBJECT_3D_EDITS  = 26,
+    IDT_NUMBER_OF        = 27,
 } INJECTION_DATA_TYPE;
 
 typedef enum {