From e6bf7e77797103ee7ab0eda57c360c38f1b2089c Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Tue, 2 Sep 2025 18:41:59 -0700
Subject: Add map orientation.

---
 include/isogfx/asset.h | 11 +++++++++++
 src/isogfx.c           |  2 ++
 tools/mkasset.py       | 10 ++++++++++
 3 files changed, 23 insertions(+)

diff --git a/include/isogfx/asset.h b/include/isogfx/asset.h
index 6050500..361ffcd 100644
--- a/include/isogfx/asset.h
+++ b/include/isogfx/asset.h
@@ -43,6 +43,16 @@ typedef struct Ts_TileSet {
 // Tile map (TM) file format.
 // -----------------------------------------------------------------------------
 
+typedef enum Tm_Orientation {
+  Tm_Orthogonal = 0,
+  Tm_Isometric  = 1,
+} Tm_Orientation;
+
+typedef struct Tm_Flags {
+  Tm_Orientation orientation : 1;
+  int            unused      : 15;
+} Tm_Flags;
+
 typedef struct Tm_Layer {
   Tile tiles[1]; // Count: world_width * world_height.
 } Tm_Layer;
@@ -54,6 +64,7 @@ typedef struct Tm_Map {
   uint16_t base_tile_width;
   uint16_t base_tile_height;
   uint16_t num_layers;
+  uint16_t flags;    // Tm_flagsFlags
   Tm_Layer layers[]; // Count: num_layers.
 } Tm_Map;
 
diff --git a/src/isogfx.c b/src/isogfx.c
index c3a87bf..865ebb4 100644
--- a/src/isogfx.c
+++ b/src/isogfx.c
@@ -267,6 +267,8 @@ bool isogfx_load_world(IsoGfx* iso, const char* filepath) {
   }
   Tm_Map* const map = iso->map;
 
+  printf("Map orientation: %d\n", ((Tm_Flags*)&map->flags)->orientation);
+
   // Load the tile set.
   //
   // Tile set path is relative to the tile map file. Make it relative to the
diff --git a/tools/mkasset.py b/tools/mkasset.py
index 62d1d88..f21a2f9 100644
--- a/tools/mkasset.py
+++ b/tools/mkasset.py
@@ -13,6 +13,7 @@
 import argparse
 import ctypes
 import sys
+from enum import IntEnum
 from typing import Generator
 from xml.etree import ElementTree
 
@@ -23,6 +24,12 @@ from PIL import Image
 MAX_PATH_LENGTH = 128
 
 
+class Orientation(IntEnum):
+    """Map orientation. Must match Tm_Orientation in asset.h"""
+    Orthogonal = 0
+    Isometric = 1
+
+
 def drop_extension(filepath):
     return filepath[:filepath.rfind('.')]
 
@@ -178,11 +185,13 @@ def convert_tmx(input_filepath, output_filepath):
     base_tile_width = int(root.attrib["tilewidth"])
     base_tile_height = int(root.attrib["tileheight"])
     num_layers = 1
+    flags = Orientation.Isometric if (root.attrib["orientation"] == "isometric") else Orientation.Orthogonal
 
     print(f"Map width:   {map_width}")
     print(f"Map height:  {map_height}")
     print(f"Tile width:  {base_tile_width}")
     print(f"Tile height: {base_tile_height}")
+    print(f"Orientation: {flags}")
 
     tileset_path = None
 
@@ -205,6 +214,7 @@ def convert_tmx(input_filepath, output_filepath):
                 output.write(ctypes.c_uint16(base_tile_width))
                 output.write(ctypes.c_uint16(base_tile_height))
                 output.write(ctypes.c_uint16(num_layers))
+                output.write(ctypes.c_uint16(flags))
             elif child.tag == "layer":
                 layer = child
                 layer_id = int(layer.attrib["id"])
-- 
cgit v1.2.3