WIP - New metatile converter

src/reskit/level/system.rs

@@ -143,7 +143,7 @@ pub fn get_metatile_maps( tilemap: &TiledTilemap ) -> Result<Vec<u8>, Box<dyn Er
         subdefinitions.extend( metatile.width.to_be_bytes() );
         subdefinitions.extend( metatile.height.to_be_bytes() );
 
-        let ( tilemap_index, palettes ) = metatile_tilemap_index( &metatile.source, &tilemap.tileset )?;
+        let ( tilemap_index, palettes ) = get_tilemap_prefix_palette( &metatile.source, &tilemap.tileset )?;
         for tile in &metatile.tiles {
             let palette = {
                 if *tile == 0 {
@@ -235,7 +235,7 @@ pub fn get_metatile_maps( tilemap: &TiledTilemap ) -> Result<Vec<u8>, Box<dyn Er
     Ok( result )
 }
 
-fn metatile_tilemap_index( target_source: &str, tilesets: &Vec<TiledTileset> ) -> Result<(usize, Vec<Option<u8>>), Box<dyn Error>> {
+fn get_tilemap_prefix_palette( target_source: &str, tilesets: &Vec<TiledTileset> ) -> Result<(usize, Vec<Option<u8>>), Box<dyn Error>> {
     // Everything starts at 1 for the blank buffer tile
     let mut index: usize = 1;
 
@@ -325,23 +325,12 @@ pub fn get_objs( tilemap: &TiledTilemap, symbol_ids: &HashMap<String, u16> ) ->
 pub fn get_sprites( tilemap: &TiledTilemap, sprite_ids: &HashMap<String, u16> ) -> Result<Vec<u8>, Box<dyn Error>> {
     let mut result: Vec<u8> = Vec::new();
 
-    let tiles_before = {
-        let mut total_tiles = 1;
-
-        for tileset in &tilemap.tileset {
-            // do not include the sprite metadata
-            if tileset.sprite_metadata.is_none() {
-                total_tiles += ( tileset.image.width() / 8 ) * ( tileset.image.height() / 8 );
-            }
-        }
-
-        total_tiles
-    };
-    let mut tiles_after: u32 = 0;
-
     let sprites: Vec<&TiledTileset> = tilemap.tileset.iter().filter( | tileset | matches!( tileset.tile_order, TileOrder::Sprite ) ).collect();
     result.extend( ( sprites.len() as u16 ).to_be_bytes() );
     for sprite in sprites {
+        // Just find the prefix of this source (add up all the number of tiles before it)
+        let ( index, _ ) = get_tilemap_prefix_palette( &sprite.source, &tilemap.tileset )?;
+
         let sprite_metadata = sprite.sprite_metadata.as_ref().ok_or( "internal error: tile order is sprite but no sprite data" )?;
 
         let sprite_id = sprite_ids.get( &sprite_metadata.id ).ok_or( format!( "invalid file: undefined sprite id \"{}\"", sprite_metadata.id ) )?;
@@ -350,9 +339,7 @@ pub fn get_sprites( tilemap: &TiledTilemap, sprite_ids: &HashMap<String, u16> )
         let tiles_across = sprite.image.width() / 8;
         let frames: u16 = ( tiles_across / ( sprite_metadata.width as u32 ) ) as u16;
 
-        let tile_index_location = tiles_before + tiles_after;
+        result.extend( ( index as u16 ).to_be_bytes() );
-        result.extend( ( tile_index_location as u16 ).to_be_bytes() );
-        tiles_after += ( ( sprite_metadata.width as u16 * sprite_metadata.height as u16 ) * frames ) as u32;
 
         result.push( sprite_metadata.width );