From d1370b955f9a86c82f92d7368237ed96318de330 Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 19 Jul 2025 09:29:12 -0700
Subject: Allocate data from a stack allocator

---
 tools/mkasset.py | 53 ++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 36 insertions(+), 17 deletions(-)

(limited to 'tools/mkasset.py')

diff --git a/tools/mkasset.py b/tools/mkasset.py
index fd2ead7..ae27ead 100644
--- a/tools/mkasset.py
+++ b/tools/mkasset.py
@@ -51,10 +51,15 @@ def convert_tsx(input_filepath, output_filepath):
     print(f"Max width:  {max_tile_width}")
     print(f"Max height: {max_tile_height}")
 
+    pixels = []  # List of byte arrays
+    pixels_offset = 0
+
     with open(output_filepath, 'bw') as output:
+        # Write the header.
         output.write(ctypes.c_uint16(tile_count))
-        output.write(ctypes.c_uint16(max_tile_width))
-        output.write(ctypes.c_uint16(max_tile_height))
+        # output.write(ctypes.c_uint16(max_tile_width))
+        # output.write(ctypes.c_uint16(max_tile_height))
+        output.write(ctypes.c_uint16(0))  # Pad.
 
         num_tile = 0
         for tile in root:
@@ -72,12 +77,23 @@ def convert_tsx(input_filepath, output_filepath):
             tile_height = int(image.attrib["height"])
             tile_path = image.attrib["source"]
 
-            output.write(ctypes.c_uint16(tile_width))
-            output.write(ctypes.c_uint16(tile_height))
+            assert (tile_width > 0)
+            assert (tile_height > 0)
 
+            tile_pixels_offset = pixels_offset
             with Image.open(tile_path) as im:
                 bytes = im.convert('RGBA').tobytes()
-                output.write(bytes)
+                pixels.append(bytes)
+                pixels_offset += len(bytes)
+
+            # Write the tile.
+            output.write(ctypes.c_uint16(tile_width))
+            output.write(ctypes.c_uint16(tile_height))
+            output.write(ctypes.c_uint32(tile_pixels_offset))
+
+        # Write the pixel data.
+        for bytes in pixels:
+            output.write(bytes)
 
 
 def convert_tmx(input_filepath, output_filepath):
@@ -96,23 +112,27 @@ def convert_tmx(input_filepath, output_filepath):
     print(f"Tile width:  {base_tile_width}")
     print(f"Tile height: {base_tile_height}")
 
-    with open(output_filepath, 'bw') as output:
-        output.write(ctypes.c_uint16(map_width))
-        output.write(ctypes.c_uint16(map_height))
-        output.write(ctypes.c_uint16(base_tile_width))
-        output.write(ctypes.c_uint16(base_tile_height))
-        output.write(ctypes.c_uint16(num_layers))
-
-        tileset_path = None
+    tileset_path = None
 
+    with open(output_filepath, 'bw') as output:
         for child in root:
             if child.tag == "tileset":
+                assert (not tileset_path)  # Only supporting one tile set per map right now.
+
                 tileset = child
                 tileset_path = tileset.attrib["source"]
 
                 print(f"Tile set: {tileset_path}")
 
                 tileset_path = tileset_path.replace("tsx", "ts")
+
+                # Write the header.
+                output.write(to_char_array(tileset_path, MAX_PATH_LENGTH))
+                output.write(ctypes.c_uint16(map_width))
+                output.write(ctypes.c_uint16(map_height))
+                output.write(ctypes.c_uint16(base_tile_width))
+                output.write(ctypes.c_uint16(base_tile_height))
+                output.write(ctypes.c_uint16(num_layers))
             elif child.tag == "layer":
                 layer = child
                 layer_id = int(layer.attrib["id"])
@@ -123,9 +143,6 @@ def convert_tmx(input_filepath, output_filepath):
                 print(f"Width:  {layer_width}")
                 print(f"Height: {layer_height}")
 
-                assert (tileset_path)
-                output.write(to_char_array(tileset_path, MAX_PATH_LENGTH))
-
                 # Assume the layer's dimensions matches the map's.
                 assert (layer_width == map_width)
                 assert (layer_height == map_height)
@@ -139,7 +156,9 @@ def convert_tmx(input_filepath, output_filepath):
                 for row in rows:
                     tile_ids = [x.strip() for x in row.split(',') if x]
                     for tile_id in tile_ids:
-                        output.write(ctypes.c_uint16(int(tile_id)))
+                        # TODO: We need to handle 'firsgid' in TMX files.
+                        #  For now, assume it's 1 and do -1 to make the tiles 0-based.
+                        output.write(ctypes.c_uint16(int(tile_id) - 1))
 
 
 def get_num_cols(image, sprite_width):
-- 
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