Add number of metatiles to dmapack structure

This reverts commit 31832e8882.

Cargo.toml

@@ -16,4 +16,9 @@ hound = "3.5.0"
 pitch_shift = "1.0.0"
 linked_hash_set = "0.1.4"
 linked-hash-map = "0.5.6"
-convert_case = "0.6.0"
+convert_case = "0.6.0"
+roxmltree = "0.18.0"
+regex = "1.9.5"
+euclid = "0.22.9"
+flo_curves = "0.7.2"
+fixed = "1.24.0"

README.md

@@ -1,24 +1,11 @@
-Reskit
+Reskit (stinkhead7ds edition)
 ======
 
-The **R**etro **E**ntertainment **S**oftware Tool**kit** (reskit) is a suite containing a variety of tools useful for creating 8-bit and 16-bit console homebrew software. Reskit allows you to easily generate tilemaps and convert soundtracks for import into your homebrew game projects.
+<font color="red">This is an internal branch used by Rivethead Interactive for the development of _Stinkhead & The Seven Deadly Sins._ No issues, pull requests, or support of any kind will be taken for `level`, `easing`, and other tools exclusive to this branch.</font>
 
-To get started, check out the [wiki](https://git.ne0ndrag0n.com/ashley/reskit/wiki/?action=_pages) or type `reskit --help` to view a list of supported tools and options.
+## Internal Tools
-
+* `level` - Generate a stinkhead7ds level from a Tiled editor module.
-**Reskit is beta software!** Please read important disclaimers for each tool.
+* `easing` - _Coming soon!_ Generate a cubic bezier easing curve for a given timespan e.g. for stylistic camera motion.
-
+   * Output will be in format:
-# Available Tools
+      * 2 bytes: Length of the curve, in 1/60 s increments.
-* `tileset` - Convert an image to a series of tiles for a given console.
+      * For each 1/60 increment: the value on the curve at the given 1/60 s increment.
-   * Supported consoles: Sega Mega Drive VDP (tile and sprite order)
-* `soundtrack` - Convert a music sequence to an on-console format/sound driver
-   * Supported input formats: DMF (Deflemask) Version 27 (1.1.8)
-   * Supported export formats: Echo Sound Engine (ESF) for Sega Mega Drive
-
-# Build
-Reskit is developed in Rust and provided as a cargo crate. Simply type `cargo build` to build the project. Output should be in `target/debug/reskit`.
-
-# Reporting Issues
-First [register](https://git.ne0ndrag0n.com/user/sign_up) for an account on Temple of the Neon Dragon, then see the [Issues page](https://git.ne0ndrag0n.com/ashley/reskit/issues).
-
-# Pull Requests/Contributing
-Contributions are welcome! Request a repository slot in [this issue](https://git.ne0ndrag0n.com/ashley/reskit/issues/4) and I will allocate a repository for your account so that you may fork Reskit.

src/reskit/cli/evaluator.rs

@@ -1,6 +1,6 @@
-use std::{error::Error, fs::File, io::Write, path::Path};
+use std::{error::Error, fs::File, io::Write, path::Path, collections::HashMap};
 use clap::Parser;
-use crate::reskit::{tileset, soundtrack::{formats::dmf::DmfModule, engines::echo::engine::{EchoFormat, EchoArtifact}}, utility::print_good};
+use crate::reskit::{tileset, soundtrack::{formats::dmf::DmfModule, engines::echo::engine::{EchoFormat, EchoArtifact}}, utility::print_good, level::{converter::get_tiled_tilemap, system::{get_tiles, get_code, get_metatile_maps, get_collision_map, get_objs, get_sprites}}, easing::get_cubic_bezier};
 use super::settings::{Args, Tools, TileOutputFormat, TileOrder};
 
 pub fn run_command() -> Result<(), Box<dyn Error>> {
@@ -19,7 +19,7 @@ pub fn run_command() -> Result<(), Box<dyn Error>> {
                     TileOrder::Tile => "tile",
                     TileOrder::Sprite => "sprite"
                 }
-            ),
+            )?,
         Tools::Soundtrack { input_files, output_directory, input_format: _, output_format: _, source_file_format: _, source_file_output_directory, artifact_output_directory } => {
             if input_files.is_empty() {
                 return Err( "no input files (see `reskit soundtrack --help` for more info)" )?;
@@ -65,6 +65,89 @@ pub fn run_command() -> Result<(), Box<dyn Error>> {
 
             print_good( "all files converted successfully" );
         }
+        Tools::Level { input_file, output_directory, fields, symbol_ids, sprite_ids, console: _ } => {
+            // Clap can't do it. Sad!
+            let mut all_symbols: HashMap<String, u16> = HashMap::new();
+            let mut all_sprites: HashMap<String, u16> = HashMap::new();
+            for pair in symbol_ids {
+                let symbols: Vec<&str> = pair.split( "=" ).collect();
+                if symbols.len() != 2 {
+                    return Err( format!( "invalid format for symbol_ids: {}", pair ) )?;
+                }
+
+                let symbol_name = symbols[ 0 ];
+                let symbol_id: u16 = symbols[ 1 ].parse()?;
+
+                all_symbols.insert( symbol_name.to_owned(), symbol_id );
+            }
+            for pair in sprite_ids {
+                let symbols: Vec<&str> = pair.split( "=" ).collect();
+                if symbols.len() != 2 {
+                    return Err( format!( "invalid format for symbol_ids: {}", pair ) )?;
+                }
+
+                let symbol_name = symbols[ 0 ];
+                let symbol_id: u16 = symbols[ 1 ].parse()?;
+
+                all_sprites.insert( symbol_name.to_owned(), symbol_id );
+            }
+
+            let symbol_ids = all_symbols;
+            let sprite_ids = all_sprites;
+            let fields: Vec<&str> = fields.split( "," ).collect();
+
+            let tiled_file = get_tiled_tilemap( &input_file, &fields )?;
+
+            // Get tile and palette files
+            let ( all_tiles, palettes ) = get_tiles( &tiled_file )?;
+
+            let mut tiles_bin = File::create( format!( "{}tiles.bin", output_directory ) )?;
+            tiles_bin.write_all( &all_tiles )?;
+            print_good( "exported tiles.bin" );
+
+            let mut palettes_bin = File::create( format!( "{}palettes.pal", output_directory ) )?;
+            palettes_bin.write_all( &palettes )?;
+            print_good( "exported palettes.pal" );
+
+            let mut nametables_bin = File::create( format!( "{}nametables.map", output_directory ) )?;
+            nametables_bin.write_all( &get_metatile_maps( &tiled_file )? )?;
+            print_good( "exported nametables.map" );
+
+            let mut nametables_bin = File::create( format!( "{}collision.lvc", output_directory ) )?;
+            nametables_bin.write_all( &get_collision_map( &tiled_file )? )?;
+            print_good( "exported collision.lvc" );
+
+            let mut objs_bin = File::create( format!( "{}objects.obs", output_directory ) )?;
+            objs_bin.write_all( &get_objs( &tiled_file, &symbol_ids )? )?;
+            print_good( "exported objects.obs" );
+
+            let mut sprites_bin = File::create( format!( "{}sprites.spt", output_directory ) )?;
+            sprites_bin.write_all( &get_sprites( &tiled_file, &sprite_ids )? )?;
+            print_good( "exported sprites.spt" );
+
+            let mut code_asm = File::create( format!( "{}level.asm", output_directory ) )?;
+            code_asm.write_all( &get_code( &tiled_file, "testlevel", "levels/" )?.as_bytes() )?;
+            print_good( "exported level.asm" );
+        }
+        Tools::Easing { output_directory, interval, point_1, point_2 } => {
+            let cp1: Vec<&str> = point_1.split( "," ).collect();
+            if cp1.len() != 2 {
+                return Err( format!( "invalid format for point_1: {}", point_1 ) )?;
+            }
+
+            let ( cp1_x, cp1_y ): ( f64, f64 ) = ( cp1[ 0 ].parse()?, cp1[ 1 ].parse()? );
+
+            let cp2: Vec<&str> = point_1.split( "," ).collect();
+            if cp2.len() != 2 {
+                return Err( format!( "invalid format for point_2: {}", point_2 ) )?;
+            }
+
+            let ( cp2_x, cp2_y ): ( f64, f64 ) = ( cp2[ 0 ].parse()?, cp2[ 1 ].parse()? );
+
+            let mut easing = File::create( format!( "{}curve.bin", output_directory ) )?;
+            easing.write_all( &get_cubic_bezier( ( 0.0, 0.0 ), ( cp1_x, cp1_y ), ( cp2_x, cp2_y ), ( 1.0, 1.0 ), interval )? )?;
+            print_good( "exported curve.bin" );
+        }
     };
 
     Ok( () )

src/reskit/cli/settings.rs

@@ -11,7 +11,7 @@ pub struct Args {
 
 }
 
-#[derive(Clone, ValueEnum)]
+#[derive(Clone, Debug, ValueEnum)]
 pub enum TileOrder {
     Tile,
     Sprite
@@ -38,6 +38,11 @@ pub enum ArtifactListFormat {
     Asmx
 }
 
+#[derive(Clone, ValueEnum)]
+pub enum SystemType {
+    Md
+}
+
 #[derive(Subcommand)]
 pub enum Tools {
 
@@ -91,5 +96,55 @@ pub enum Tools {
         /// Directory to output artifacts (instruments and samples)
         #[arg(long, default_value_t=String::from( "./" ))]
         artifact_output_directory: String
+    },
+
+    #[command(name = "level")]
+    #[command(about = "Generate a level containing a tilemap and defining an entity-component system, from a selected Tiled Map Editor .tmx file.")]
+    Level {
+        /// Input filename
+        #[arg(short, long)]
+        input_file: String,
+
+        /// Output directory for artifacts
+        #[arg(short, long, default_value_t=String::from("./"))]
+        output_directory: String,
+
+        /// Zero or more fields in order to define objects' struct (after object ID, position x, and position y) (format: <field1>,<field2>,<field3>)
+        #[arg(long, default_value_t=String::from(""))]
+        fields: String,
+
+        /// Zero or more symbol ID definitions used for string identifiers in objects (format: <symbol_name>=<u8>)
+        #[arg(long, num_args(0..))]
+        symbol_ids: Vec<String>,
+
+        /// Zero or more sprite ID definitions (format: <sprite_name_1>=<sprite_id_1>, <sprite_name_2>=<sprite_id_2>, ... )
+        #[arg(long, num_args(0..))]
+        sprite_ids: Vec<String>,
+
+        /// Console system type
+        #[arg(short, long, value_enum, default_value_t=SystemType::Md)]
+        console: SystemType
+    },
+
+    #[command(name = "easing")]
+    #[command(about = "Generate an easing curve given a time interval and control points.")]
+    Easing {
+
+        /// Output directory for artifacts
+        #[arg(short, long, default_value_t=String::from("./"))]
+        output_directory: String,
+
+        /// Time span of the easing curve (in 1/60 s increments)
+        #[arg(short,long)]
+        interval: u16,
+
+        /// First control point of the cubic bezier (format: <x>,<y>)
+        #[arg(long)]
+        point_1: String,
+
+        /// Second control point of the cubic bezier (format: <x>,<y>)
+        #[arg(long)]
+        point_2: String
+
     }
 }

src/reskit/easing.rs

@@ -0,0 +1,65 @@
+use std::error::Error;
+use flo_curves::*;
+use flo_curves::{bezier, Coord2};
+
+use super::utility::print_info;
+
+/*
+stinkhead7ds easing curve description:
+
+e.g. going from 120 to 140
+easing function is cubic bezier going from 0.0 to 1.0
+
+140-120=20 increments
+0.0 is +0 and 1.0 is +20
+
+console has no floating point and fixed point will overflow 16-bit
+each curve tailored for use case. for camera motion:
+- generate the cubic bezier easing curve in my custom branch of reskit, converting 0.0-1.0 floating point spans to x/128 fractions equivalent to x/100 fractions.
+  literal grade school shit i realised i wasted a weekend re-deriving from first principles. these fparts even export as single bytes, so that's 3 less bytes per point
+  on the curve than if i were sticking with 16.16 fix. for a 1 second animation, 60 points are taken on the 0.0-1.0 curve, for a 2 second animation, 120 points are taken, etc.
+  equivalent PAL framerate curves can be export in the same curve file.
+- the camera animates moves by setting a new destination point and performing interpolation of intermediate positions along the curve - just like css easing functions, or
+  unity/unreal bezier curves. you restrict camera new position to +/- powers of two in any axis to eliminate mul[s/u].w. e.g. camera moves +2, +4, +8.... in the x direction.
+- for each axis, new position - current position = span of movement. so if you're starting at x = 30 and moving to x = 46, you're going +16 in the x direction
+- while the camera is animating, interpolate positions by reading the fractional on the curve for the current frame and doing fractional * span / 128. since new camera positions
+  in any axis are kept power of two this can all be done using asl/asr. take the remainder with the and 2^127 trick and bump the resulting value up 1 if the modulo is >= 64
+- ✨ cubic bezier animated camera motion
+*/
+
+
+/**
+ * Output a binary for a cubic bezier defined by the given four points and the
+ * time interval defined as number of 1/60 jiffies.
+ */
+pub fn get_cubic_bezier( p0: (f64, f64), c0: (f64, f64), c1: (f64, f64), p1: (f64, f64), jiffies: u16 ) -> Result<Vec<u8>, Box<dyn Error>> {
+    let mut result: Vec<u8> = Vec::new();
+
+    // 2 bytes: Number of frames this curve spans
+    result.extend( jiffies.to_be_bytes() );
+
+    let curve = bezier::Curve::from_points(
+        Coord2( p0.0, p0.1 ),
+        ( Coord2( c0.0, c0.1 ), Coord2( c1.0, c1.1 ) ),
+        Coord2( p1.0, p1.1 )
+    );
+
+    let mut current_jiffy = 0.0;
+    // For each point in curve: 1 byte fractional point in the curve at the given frame
+    for i in 0..jiffies {
+        let point = curve.point_at_pos( current_jiffy );
+        let x = point.1;
+
+        // Round and convert x to n/100 fraction, then equivalent n/128 fraction
+        let x = ( ( x * 100.0 ).round() / 100.0 ) * 100.0; // only get last two decimal places, then convert to whole number
+        let x = x * 128.0 / 100.0; // x / 100 = y / 128
+        let x = x.round() as u8;
+
+        print_info( &format!( "at iteration {}, curve is {:?}, fractional format will be {}", i, point, x ) );
+        current_jiffy += 1.0 / jiffies as f64;
+
+        result.push( x );
+    }
+
+    Ok( result )
+}

src/reskit/level/converter.rs

@@ -0,0 +1,517 @@
+use std::{error::Error, fs::read_to_string, path::Path, borrow::Cow, collections::HashSet, convert::TryInto};
+use euclid::default::Rect;
+use image::{DynamicImage, GenericImageView};
+use linked_hash_map::LinkedHashMap;
+use roxmltree::Node;
+use crate::reskit::{utility::print_warning, cli::settings::TileOrder};
+use super::dmapack;
+
+#[derive(Debug)]
+pub struct TiledTilemap {
+    pub tileset: Vec<TiledTileset>,
+    pub metatiles: Vec<Metatile>,
+    pub layers: Vec<Layer>,
+    pub objects: Vec<Object>,
+    pub collision: Vec<Rect<u16>>,
+    pub width: usize,
+    pub height: usize
+}
+
+#[derive(Debug, PartialEq)]
+pub struct Metatile {
+    pub id: u32,
+    pub source: String,
+    pub width: u16,
+    pub height: u16,
+    pub pack: dmapack::PackSettings,
+    pub tiles: Vec<u32>
+}
+
+#[derive(Debug)]
+pub struct Object {
+    pub id: String,
+    pub attributes: LinkedHashMap<String, String>
+}
+
+#[derive(Debug)]
+pub struct SpriteMetadata {
+    pub id: String,
+    pub width: u8,
+    pub height: u8,
+    pub palette: u16,
+    pub anim_interval: Option<u16>
+}
+
+#[derive(Debug)]
+pub struct TiledTileset {
+    pub source: String,
+    pub image: DynamicImage,
+    pub palettes: Vec<Option<u8>>,
+    pub tile_order: TileOrder,
+    pub sprite_metadata: Option<SpriteMetadata>
+}
+
+#[derive(Debug)]
+pub enum SystemPlane {
+    MdPlaneA,
+    MdPlaneB
+}
+
+#[derive(Debug)]
+pub enum Layer {
+    Metatile {
+        system_plane: SystemPlane,
+        tiles: Vec<u32>
+    }
+}
+
+fn get_layer( layer: Node, map_width: usize, map_height: usize ) -> Result<Option<Layer>, Box<dyn Error>> {
+    let layer_id = layer.attribute( "id" ).ok_or( "invalid file: on layer: no id" )?;
+    let layer_name = layer.attribute( "name" ).unwrap_or( "<no name>" );
+    let layer_name = format!( "({}, ID: {})", layer_name, layer_id );
+
+    // Validate layer is same as total map size
+    let ( layer_width, layer_height ): ( usize, usize ) = (
+        layer.attribute( "width" ).ok_or( format!( "invalid file: on layer {}: no width attribute", layer_name ) )?.parse()?,
+        layer.attribute( "height" ).ok_or( format!( "invalid file: on layer {}: no height attribute", layer_name ) )?.parse()?
+    );
+
+    if layer_width != map_width || layer_height != map_height {
+        return Err( format!( "invalid file: on layer {}: layer width must match map width", layer_name ) )?
+    }
+
+    let properties = layer.descendants().find( | node | node.tag_name() == "properties".into() );
+    if let Some( properties ) = properties {
+        let properties: Vec<Node> = properties.descendants().filter( | node | {
+            if let Some( name ) = node.attribute( "name" ) {
+                name == "reskit-layer"
+            } else {
+                false
+            }
+        } ).collect();
+
+        // Should be either one or none
+        if let Some( layer_property ) = properties.first() {
+            let layer_type = layer_property.attribute( "value" ).ok_or( format!( "invalid file: on layer {}: no value for property", layer_name ) )?;
+
+            let data = layer.descendants()
+                            .find( | node | node.tag_name() == "data".into() )
+                            .ok_or( format!( "invalid file: on layer {}: no data for layer", layer_name ) )?;
+
+            let encoding = data.attribute( "encoding" ).ok_or( format!( "invalid file: on layer {}: no encoding attribute", layer_name ) )?;
+            if encoding != "csv" {
+                return Err( format!( "invalid file: on layer {}: only csv is supported for layer encoding", layer_name ) )?
+            }
+
+            let data: Vec<&str> = data.text().ok_or( format!( "invalid file: on layer {}: no layer data", layer_name ) )?.split( "," ).collect();
+            let tiles: Vec<u32> = data.into_iter().map( | string | Ok( string.trim().parse()? ) ).collect::< Result< Vec<u32>, Box<dyn Error> > >()?;
+
+            match layer_type.to_lowercase().as_str() {
+                "a" => Ok( Some( Layer::Metatile {
+                    system_plane: SystemPlane::MdPlaneA,
+                    tiles
+                } ) ),
+                "b" => Ok( Some( Layer::Metatile {
+                    system_plane: SystemPlane::MdPlaneB,
+                    tiles
+                } ) ),
+                _ => {
+                    print_warning( &format!( "on layer {}: invalid reskit-layer value {}; ignoring this layer", layer_name, layer_type ) );
+                    Ok( None )
+                }
+            }
+        } else {
+            print_warning( &format!( "on layer {}: no reskit-layer property defining hardware layer or collision; ignoring this layer", layer_name ) );
+            Ok( None )
+        }
+    } else {
+        print_warning( &format!( "on layer {}: no properties defining hardware layer or collision; ignoring this layer", layer_name ) );
+        Ok( None )
+    }
+}
+
+fn get_tiles( tileset: Node, seen_sources: &mut HashSet<String>, working_directory: &str ) -> Result<Option<TiledTileset>, Box<dyn Error>> {
+    // Get the image for the tileset and its source
+    let image = tileset.descendants().find( | node | node.tag_name() == "image".into() ).ok_or( "invalid file: no image object" )?;
+    let source = image.attribute( "source" ).ok_or( "invalid file: no source attribute on image" )?.to_string();
+
+    // If the file path ends in .tmx, it's a metatile definition. We need to hop to the .tmx file in source, then redefine layer
+    // to the single tileset in that metatile .tmx.
+    let full_path = format!( "{}/{}", working_directory, source );
+    let formatted_path = Path::new( &full_path );
+    if let Some( extension ) = formatted_path.extension() {
+        let extension = extension.to_string_lossy();
+        if extension == "tmx" {
+            // Case where source is a nested tileset. Open the .tmx file
+            let file = read_to_string( full_path.clone() )?;
+            let tmx_document = roxmltree::Document::parse( &file )?;
+
+            // Obtain the single (first) <tileset>
+            let tileset = tmx_document.descendants().find( | node | node.tag_name() == "tileset".into() ).ok_or( "invalid file: metatile has no tileset" )?;
+            let tileset_source = tileset.attribute( "source" ).ok_or( "invalid file: metatile tileset has no source" )?.to_string();
+
+            // tileset_source should already point to the _actual_ source we need. Was this tileset source already seen? If so, bail
+            if seen_sources.contains( &tileset_source ) {
+                return Ok( None )
+            } else {
+                seen_sources.insert( tileset_source.clone() );
+            }
+
+            // Load nested tileset into roxmltree document
+            let file = read_to_string( format!( "{}/{}", working_directory, tileset_source ) )?;
+            let nested_tileset = roxmltree::Document::parse( &file )?;
+            let tileset = nested_tileset.descendants().find( | node | node.tag_name() == "tileset".into() ).ok_or( "invalid file: metatile tileset has no tileset" )?;
+
+            // Return nested tileset from tmx file
+            let result = get_tiles( tileset, seen_sources, working_directory )?;
+            if let Some( mut result ) = result {
+                result.source = tileset_source.to_owned();
+                return Ok( Some( result ) )
+            }
+
+            return Ok( result )
+        }
+    }
+
+    // Case where source is an actual image
+    let image = image::open( full_path )?;
+
+    // Image must be a multiple of 8 (--system md)
+    if image.width() % 8 != 0 { return Err( "invalid file: tileset width not multiple of 8" )? }
+    if image.height() % 8 != 0 { return Err( "invalid file: tileset height not multiple of 8" )? }
+
+    let tile_count: usize = tileset.attribute( "tilecount" ).ok_or( "invalid file: no tilecount attribute on tileset" )?.parse()?;
+    let mut palettes: Vec<Option<u8>> = vec![ None; tile_count ];
+
+    let defined_tiles = tileset.descendants().filter( | node | node.tag_name() == "tile".into() );
+    for defined_tile in defined_tiles {
+        let tile_id: usize = defined_tile.attribute( "id" ).ok_or( "invalid file: id attribute not defined on a tile" )?.parse()?;
+        let properties = defined_tile.descendants().find( | node | node.tag_name() == "properties".into() ).ok_or( "invalid file: no properties descendant in tileset" )?;
+        let property = properties.descendants().find( | node | node.tag_name() == "property".into() && node.attribute( "name" ).unwrap_or( "" ) == "reskit-palette" );
+        if let Some( property ) = property {
+            let property_type = property.attribute( "type" ).unwrap_or( "string" );
+            if property_type == "int" {
+                let palette_value: u8 = property.attribute( "value" ).ok_or( "invalid file: reskit-palette property has no value" )?.parse()?;
+                // --system md
+                if palette_value > 3 {
+                    print_warning( &format!( "reskit-palette property on tile {} is not valid palette (0 to 3) - leaving palette unset, this is probably not what you want...", tile_id ) );
+                } else {
+                    palettes[ tile_id ] = Some( palette_value );
+                }
+            } else {
+                print_warning( &format!( "reskit-palette property on tile {} is not int type - leaving palette unset, this is probably not what you want...", tile_id ) )
+            }
+        }
+    }
+
+    let sprite_metadata;
+
+    // Retrieve the tile order as specified by reskit-tile-order (if none is specified, fallback on Tile)
+    let tile_order = if let Some( properties ) = tileset.descendants().find( | node | node.tag_name() == "properties".into() ) {
+        if let Some( tile_order_property ) = properties.descendants().find( | node | node.attribute( "name" ) == Some( "reskit-tile-order" ) ) {
+            let tile_order_property = tile_order_property.attribute( "value" ).expect( "invalid file: no reskit-tile-order value" );
+            match tile_order_property.to_lowercase().as_str() {
+                "sprite" => {
+                    // If sprite, reskit-sprite-height and reskit-sprite-width must be defined
+                    let reskit_sprite_height = properties.descendants().find( | node | node.attribute( "name" ) == Some( "reskit-sprite-height" ) ).ok_or( "invalid file: for reskit-tile-order \"sprite\", reskit-sprite-height and reskit-sprite-width must be defined." )?;
+                    let reskit_sprite_width = properties.descendants().find( | node | node.attribute( "name" ) == Some( "reskit-sprite-width" ) ).ok_or( "invalid file: for reskit-tile-order \"sprite\", reskit-sprite-height and reskit-sprite-width must be defined." )?;
+                    let reskit_sprite_id = properties.descendants().find( | node | node.attribute( "name" ) == Some( "reskit-sprite-id" ) ).ok_or( "invalid file: for reskit-tile-order \"sprite\", reskit-sprite-id must be defined." )?;
+                    let reskit_palette = properties.descendants().find( | node | node.attribute( "name" ) == Some( "reskit-palette" ) ).ok_or( "invalid file: for reskit-tile-order \"sprite\", reskit-palette must be defined." )?;
+                    let reskit_anim_interval = properties.descendants().find( | node | node.attribute( "name" ) == Some( "reskit-anim-interval" ) );
+
+                    let reskit_sprite_height = reskit_sprite_height.attribute( "value" ).ok_or( "invalid file: no reskit-sprite-height value" )?;
+                    let reskit_sprite_width = reskit_sprite_width.attribute( "value" ).ok_or( "invalid file: no reskit-sprite-width value" )?;
+                    let reskit_palette = reskit_palette.attribute( "value" ).ok_or( "invalid file: no reskit-palette value" )?;
+
+                    let id: String = reskit_sprite_id.attribute( "value" ).ok_or( "invalid file: no reskit-sprite-id value" )?.to_owned();
+                    let width: u8 = reskit_sprite_width.parse()?;
+                    let height: u8 = reskit_sprite_height.parse()?;
+                    let palette: u16 = reskit_palette.parse()?;
+
+                    let anim_interval = if let Some( property ) = reskit_anim_interval {
+                        let value = property.attribute( "value" ).ok_or( "invalid file: no reskit-anim-interval value" )?;
+                        Some( value.parse()? )
+                    } else {
+                        None
+                    };
+
+                    sprite_metadata = Some( SpriteMetadata { id, width, height, palette, anim_interval } );
+
+                    TileOrder::Sprite
+                },
+                "tile" => {
+                    sprite_metadata = None;
+                    TileOrder::Tile
+                },
+                invalid => {
+                    sprite_metadata = None;
+                    print_warning( &format!( "invalid setting for property reskit-tile-order: {}. falling back on \"tile\"", invalid ) );
+                    TileOrder::Tile
+                }
+            }
+        } else {
+            sprite_metadata = None;
+            TileOrder::Tile
+        }
+    } else {
+        sprite_metadata = None;
+        TileOrder::Tile
+    };
+
+    Ok( Some( TiledTileset { source: format!( "" ), image, palettes, tile_order, sprite_metadata } ) )
+}
+
+pub fn get_metatile( id: u32, tileset: Node, working_directory: &str ) -> Result<Option<Metatile>, Box<dyn Error>> {
+    // Get the image for the tileset and its source
+    let image = tileset.descendants().find( | node | node.tag_name() == "image".into() ).ok_or( "invalid file: no image object" )?;
+    let source = image.attribute( "source" ).ok_or( "invalid file: no source attribute on image" )?.to_string();
+    let full_path = format!( "{}/{}", working_directory, source );
+    let formatted_path = Path::new( &full_path );
+    if let Some( extension ) = formatted_path.extension() {
+        let extension = extension.to_string_lossy();
+        if extension == "tmx" {
+            // Before we discard tileset, obtain dmapack bucket and slot
+            let bucket: u16 = tileset.descendants()
+                                .find( | node | node.tag_name() == "property".into() && node.attribute( "name" ) == Some( "reskit-dmapack-bucket" ) )
+                                .ok_or( "invalid file: no dmapack bucket specified for metatile" )?
+                                .attribute( "value" )
+                                .ok_or( "invalid file: reskit-dmapack-bucket property has no value" )?
+                                .parse()?;
+            let slot: Vec<u16> = tileset.descendants()
+                .find( | node | node.tag_name() == "property".into() && node.attribute( "name" ) == Some( "reskit-dmapack" ) )
+                .ok_or( "invalid file: no dmapack slot specified for metatile" )?
+                .attribute( "value" )
+                .ok_or( "invalid file: reskit-dmapack property has no value" )?
+                .split( "," )
+                .map( | each | each.trim().parse::<u16>().expect( "fatal: non-u16 value specified for reskit-dmapack" ) )
+                .collect();
+            let slot: [u16; 2] = slot[0..2].try_into()?;
+
+            let pack = dmapack::PackSettings { bucket, slot };
+
+            // Case where source is a nested tileset. Open the .tmx file
+            let file = read_to_string( full_path.clone() )?;
+            let tmx_document = roxmltree::Document::parse( &file )?;
+
+            // Get width and height from <map> item
+            let map_item = tmx_document.descendants().find( | node | node.tag_name() == "map".into() ).ok_or( "invalid file: no map element in metatile" )?;
+            let width: u16 = map_item.attribute( "width" ).ok_or( "invalid file: map of metatile has no width attribute" )?.parse()?;
+            let height: u16 = map_item.attribute( "height" ).ok_or( "invalid file: map of metatile has no height attribute" )?.parse()?;
+
+            // Obtain the single (first) <tileset>
+            let tileset_count = tmx_document.descendants().filter( | node | node.tag_name() == "tileset".into() ).count();
+            if tileset_count > 1 {
+                return Err( "invalid file: only a single tileset is valid for a metatile file" )?
+            }
+            let tileset = tmx_document.descendants().find( | node | node.tag_name() == "tileset".into() ).ok_or( "invalid file: metatile has no tileset" )?;
+            let source = tileset.attribute( "source" ).ok_or( "invalid file: metatile tileset has no source" )?.to_string();
+
+            // Create metatile object here
+            let data = tmx_document.descendants().find( | node | node.tag_name() == "data".into() ).ok_or( "invalid file: metatile has no data" )?;
+            if data.attribute( "encoding" ) != Some( "csv" ) {
+                return Err( "invalid file: metatile data not in csv format" )?
+            }
+            let data = data.text().ok_or( "invalid file: data node has no text" )?;
+            let values: Vec<&str> = data.split( "," ).collect();
+            // Subtract 1 to each value to account for firstgid. This is a sane assumption because a valid metatile file only contains a single tileset.
+            let tiles: Vec<u32> = values.into_iter().map( | string | {
+                let val = string.trim().parse::<u32>().expect( "fatal: non-u32 value in metatile" );
+                if val == 0 {
+                    val
+                } else {
+                    val - 1
+                }
+            } ).collect();
+            return Ok( Some( Metatile { id, source, width, height, pack, tiles } ) )
+        }
+    }
+
+    Ok( None )
+}
+
+pub fn get_objs( node: &Node, object_fields: &Vec<&str> ) -> Result<Vec<Object>, Box<dyn Error>> {
+    let mut result = Vec::new();
+
+    let objects = node.descendants().filter( | node | node.tag_name() == "object".into() );
+    for object in objects {
+        let object_id = object.attribute( "id" ).ok_or( "invalid file: object in objectgroup has no id attribute" )?;
+
+        if let Some( properties ) = object.descendants().find( | node | node.tag_name() == "properties".into() ) {
+            if let Some( object_id_property ) = properties.descendants().find( | node | node.attribute( "name" ) == Some( "reskit-object-id" ) ) {
+                let id = object_id_property.attribute( "value" ).ok_or( "invalid file: property has no value attribute" )?.to_owned();
+
+                let mut attributes = LinkedHashMap::new();
+
+                // Get position x and y as beginning attributes
+                let ( x, y ) = (
+                    object.attribute( "x" ).ok_or( "invalid file: object has no x position" )?.to_owned(),
+                    object.attribute( "y" ).ok_or( "invalid file: object has no y position" )?.to_owned()
+                );
+
+                attributes.insert( "x".trim().to_owned(), x );
+                attributes.insert( "y".trim().to_owned(), y );
+
+                // Custom object fields - push these in order into the LinkedHashMap
+                for field in object_fields {
+                    let property = properties.descendants().find( | node | node.attribute( "name" ) == Some( &format!( "reskit-field[{}]", field ) ) );
+                    if let Some( property ) = property {
+                        let value = property.attribute( "value" ).ok_or( "invalid file: property has no value attribute" )?.to_owned();
+                        attributes.insert( field.to_string(), value );
+                    } else {
+                        print_warning( &format!( "object {} does not define a value for struct field \"{}\", this field will be filled in with 0x00 at export", id, field ) );
+                        attributes.insert( field.to_string(), "0".to_owned() );
+                    }
+                }
+
+                result.push( Object { id, attributes } );
+            } else {
+                print_warning( &format!( "object {} has no \"reskit-object-id\" property....ignoring this object. this is probably not what you want.", object_id ) );
+            }
+        } else {
+            print_warning( &format!( "object {} has no properties....ignoring this object. this is probably not what you want", object_id ) );
+        }
+    }
+
+    Ok( result )
+}
+
+pub fn get_tiled_tilemap( path: &str, object_fields: &Vec<&str> ) -> Result<TiledTilemap, Box<dyn Error>> {
+    let file = read_to_string( path )?;
+    let document = roxmltree::Document::parse( &file )?;
+    let working_directory = {
+        let result = Path::new( path ).parent().unwrap_or( Path::new( "." ) ).to_string_lossy();
+
+        if result == "" {
+            Cow::from( "." )
+        } else {
+            result
+        }
+    };
+
+    let map = document.descendants().find( | node | node.tag_name() == "map".into() );
+    if let Some( map ) = map {
+        // Validate version
+        let version = map.attribute( "version" ).ok_or( "invalid file: no version attribute" )?;
+        if version < "1.10" || !version.starts_with( "1." ) {
+            return Err( "invalid file: unsupported version" )?
+        }
+
+        // Validate orientation and render order
+        let orientation = map.attribute( "orientation" ).ok_or( "invalid file: no orientation attribute" )?;
+        if orientation != "orthogonal" {
+            return Err( "invalid file: only orthogonal orientation is supported" )?
+        }
+        let render_order = map.attribute( "renderorder" ).ok_or( "invalid file: no renderorder attribute" )?;
+        if render_order != "left-down" {
+            return Err( "invalid file: only left-down orientation is supported" )?
+        }
+
+        let ( width, height ): ( usize, usize ) = (
+            map.attribute( "width" ).ok_or( "invalid file: no width attribute" )?.parse()?,
+            map.attribute( "height" ).ok_or( "invalid file: no height attribute" )?.parse()?
+        );
+
+        let ( tile_width, tile_height ): ( usize, usize ) = (
+            map.attribute( "tilewidth" ).ok_or( "invalid file: no tilewidth attribute" )?.parse()?,
+            map.attribute( "tileheight" ).ok_or( "invalid file: no tileheight attribute" )?.parse()?
+        );
+
+        // --system md is 8x8
+        if tile_width != 8 {
+            return Err( "invalid file: tile width is not 8 for --system md" )?
+        }
+        if tile_height != 8 {
+            return Err( "invalid file: tile height is not 8 for --system md" )?
+        }
+
+        // Build tilesets (current version assumes one tileset per level)
+        let mut tilesets: Vec<TiledTileset> = vec![];
+        let mut metatiles: Vec<Metatile> = vec![];
+        let mut seen_sources: HashSet<String> = HashSet::new();
+        for tileset in map.descendants().filter( | node | node.tag_name() == "tileset".into() ) {
+            let tileset_first_gid = tileset.attribute( "firstgid" ).ok_or( "invalid file: no tileset firstgid" )?;
+            let tileset_source_path = tileset.attribute( "source" ).ok_or( "invalid file: no tileset source" )?;
+            let tileset_file = read_to_string( format!( "{}/{}", working_directory, tileset_source_path ) )?;
+            let tileset_document = roxmltree::Document::parse( &tileset_file )?;
+            let tileset = tileset_document.descendants().find( | node | node.tag_name() == "tileset".into() ).ok_or( "invalid file: no tileset origin object" )?;
+
+            // Tilesets may instead contain metatiles
+            // First, load tilesets instead of metatiles
+            // If tileset_source_path was seen, don't proceed
+            if !seen_sources.contains( tileset_source_path ) {
+                seen_sources.insert( tileset_source_path.to_owned() );
+
+                if let Some( mut tiles ) = get_tiles( tileset.clone(), &mut seen_sources, &working_directory )? {
+                    if tiles.source == "" {
+                        tiles.source = tileset_source_path.to_owned();
+                    }
+
+                    tilesets.push( tiles );
+                }
+            }
+
+            // Then, check for metatiles
+            if let Some( metatile ) = get_metatile( tileset_first_gid.parse()?, tileset, &working_directory )? {
+                metatiles.push( metatile );
+            }
+        }
+
+        let tileset = tilesets;
+        if tileset.is_empty() {
+            return Err( "invalid file: at least one tileset must be present in file" )?
+        }
+
+        // Get the layers
+        let layers: Vec<Layer> = map.descendants()
+                                         .filter( | node | node.tag_name() == "layer".into() )
+                                         .map( | node | get_layer( node, width, height ) )
+                                         .collect::< Result< Vec<Option<Layer>>, Box<dyn Error> > >()?
+                                         .into_iter()
+                                         .filter_map( | option | option )
+                                         .collect();
+
+        // Get the entity-component system
+        let object_group = map.descendants().find( | node |
+            node.tag_name() == "objectgroup".into() &&
+            node.descendants().find( | node | node.attribute( "name" ) == Some( "reskit-layer" ) && node.attribute( "value" ) == Some( "object" ) ).is_some()
+        );
+        let objects = if let Some( object_group ) = object_group {
+            get_objs( &object_group, object_fields )?
+        } else {
+            print_warning( "no object layer in this file, this is probably not what you want..." );
+            Vec::new()
+        };
+
+        // Get collision
+        let collision_group = map.descendants().find( | node |
+            node.tag_name() == "objectgroup".into() &&
+            node.descendants().find( | node | node.attribute( "name" ) == Some( "reskit-layer" ) && node.attribute( "value" ) == Some( "collision" ) ).is_some()
+        );
+        let collision = if let Some( collision_group ) = collision_group {
+            let mut result = Vec::new();
+            let objects = collision_group.descendants().filter( | node | node.tag_name() == "object".into() );
+
+            for object in objects {
+                let x: u16 = object.attribute( "x" ).ok_or( "invalid file: no \"x\" attribute in collision bounding box" )?.parse()?;
+                let y: u16 = object.attribute( "y" ).ok_or( "invalid file: no \"y\" attribute in collision bounding box" )?.parse()?;
+                let width: u16 = object.attribute( "width" ).ok_or( "invalid file: no \"width\" attribute in collision bounding box" )?.parse()?;
+                let height: u16 = object.attribute( "height" ).ok_or( "invalid file: no \"height\" attribute in collision bounding box" )?.parse()?;
+
+                result.push( euclid::rect( x, y, width, height ) );
+            }
+
+            if result.is_empty() {
+                print_warning( "collision layer present but no bounding boxes are defined, this is probably not what you want..." );
+            }
+
+            result
+        } else {
+            print_warning( "no collision layer in this file, this is probably not what you want..." );
+            Vec::new()
+        };
+
+        Ok( TiledTilemap { tileset, metatiles, layers, objects, collision, width, height } )
+    } else {
+        Err( "invalid file: this does not appear to be valid Tiled .tmx file" )?
+    }
+}

src/reskit/level/dmapack.rs

@@ -0,0 +1,99 @@
+use std::{error::Error, collections::HashMap, cmp::max};
+use crate::reskit::level::system::get_tilemap_prefix_palette;
+use super::converter::{Metatile, TiledTilemap, TiledTileset};
+
+#[derive(Debug, PartialEq)]
+pub struct PackSettings {
+    pub bucket: u16,
+    pub slot: [u16; 2]
+}
+
+pub type Bucket<'a> = Vec<Option<u16>>;
+
+pub fn get_buckets( tilemap: &TiledTilemap ) -> Result<Vec<(u16, Bucket)>, Box<dyn Error>> {
+    let mut buckets: HashMap<u16, Bucket> = tilemap.metatiles.iter().map( | metatile | ( metatile.pack.bucket, Bucket::new() ) ).collect();
+
+    // Prepare buckets. Each bucket is exactly 64 tiles wide, and as tall as the largest
+    // height in the bucket.
+    for ( bucket_id, bucket ) in &mut buckets {
+        let height = get_bucket_height( *bucket_id, &tilemap.metatiles );
+        bucket.resize_with( 64 * height, || None );
+    }
+
+    // Build definitions and stamp them into their respective buckets and bucket slots
+    for metatile in &tilemap.metatiles {
+        // Get definition (in Vec<u16> form) so we can stamp it into the bucket
+        let definition = get_metatile_definition( metatile, &tilemap.tileset )?;
+
+        // Get bucket to stamp definition into
+        let bucket: &mut Bucket = buckets.get_mut( &metatile.pack.bucket ).ok_or( "internal error: no dmapack bucket" )?;
+
+        // Stamp the definition into the appropriate slot of the bucket.
+        for y in 0..metatile.height {
+            for x in 0..metatile.width {
+                let metatile_tile = definition.get( ( ( y * metatile.width ) + x ) as usize ).ok_or( "internal error: metatile tile expected" )?;
+
+                let bucket_target_x = x + metatile.pack.slot[ 0 ];
+                let bucket_target_y = y + metatile.pack.slot[ 1 ];
+
+                let bucket_target_tile = bucket.get_mut( ( ( bucket_target_y * 64 ) + bucket_target_x ) as usize ).ok_or( "internal error: bucket not correct size" )?;
+
+                // At any point if we encounter an overlapping bucket segment, throw an error.
+                if let Some( _ ) = bucket_target_tile {
+                    return Err( format!( "invalid file: overlapping bucket segment at {},{}", metatile.pack.slot[ 0 ], metatile.pack.slot[ 1 ] ) )?;
+                }
+
+                // Stamp the segment
+                bucket_target_tile.replace( *metatile_tile );
+            }
+        }
+    }
+
+    let mut sorted_buckets: Vec<(u16, Bucket)> = buckets.into_iter().map( | pair | pair ).collect();
+    sorted_buckets.sort_by_key( | ( bucket_id, _ ) | *bucket_id );
+
+    Ok( sorted_buckets )
+}
+
+/**
+ * Get the metatile definition (the block of u16s in sega genesis vdp nametable format)
+ */
+fn get_metatile_definition( metatile: &Metatile, tileset: &Vec<TiledTileset> ) -> Result<Vec<u16>, Box<dyn Error>> {
+    let mut result: Vec<u16> = Vec::new();
+
+    let ( tile_id_prefix, palettes ) = get_tilemap_prefix_palette( &metatile.source, &tileset )?;
+    for tile in &metatile.tiles {
+        let palette = {
+            if *tile == 0 {
+                0
+            } else {
+                let palette = palettes.get( *tile as usize ).ok_or( "internal error: no correlation between tile index and palette index" )?;
+                if let Ok( palette ) = palette.ok_or( "" ) {
+                    palette
+                } else {
+                    println!( "{:?}", palettes );
+                    return Err( format!( "invalid file: tile \"{}\" in metatile tilemap does not name reskit-palette attribute", tile ) )?;
+                }
+            }
+        };
+
+        let tile_id: u16 = if *tile == 0 { 0 } else { ( tile + tile_id_prefix as u32 ) as u16 };
+        result.push( ( ( palette as u16 ) << 13 ) | tile_id );
+    }
+
+    Ok( result )
+}
+
+/**
+ * Get the height of a given dmapack bucket (the max of all heights of metatiles in the bucket)
+ */
+fn get_bucket_height( bucket_id: u16, metatiles: &Vec<Metatile> ) -> usize {
+    let filtered: Vec<&Metatile> = metatiles.iter().filter( | metatile | metatile.pack.bucket == bucket_id ).collect();
+    let mut max_height = 0;
+
+    for metatile in filtered {
+        max_height = max( max_height, metatile.height );
+    }
+
+    max_height as usize
+}

src/reskit/level/ecs.rs

@@ -0,0 +1,100 @@
+use std::{error::Error, collections::HashMap};
+use regex::Regex;
+use roxmltree::Node;
+use crate::reskit::utility::print_warning;
+
+#[derive(Debug)]
+pub struct Entity {
+    pub components: HashMap<String, Component>
+}
+
+#[derive(Debug)]
+pub struct Component {
+    pub attributes: HashMap<String, String>
+}
+
+pub fn get_ecs( object_group: Node ) -> Result<Vec<Entity>, Box<dyn Error>> {
+    let mut entities: Vec<Entity> = Vec::new();
+
+    let objects: Vec<Node> = object_group.descendants().filter( | node | node.tag_name() == "object".into() ).collect();
+    for object in objects {
+        let object_id = object.attribute( "id" ).ok_or( "invalid file: no id attribute set on object" )?;
+        let object_name = object.attribute( "name" ).unwrap_or( "<no name>" );
+        let object_name = format!( "({}, ID: {})", object_id, object_name );
+
+        let mut entity: Entity = Entity {
+            components: HashMap::new()
+        };
+
+        // Get attributes for implicit `position` component
+        let x = object.attribute( "x" ).ok_or( "invalid file: position property not present on object" )?;
+        let y = object.attribute( "y" ).ok_or( "invalid file: position property not present on object" )?;
+        let width = object.attribute( "width" ).ok_or( "invalid file: position property not present on object" )?;
+        let height = object.attribute( "height" ).ok_or( "invalid file: position property not present on object" )?;
+
+        entity.components.insert(
+            format!( "position" ),
+            Component {
+                attributes: HashMap::from( [
+                    ( format!( "x" ),      x.to_owned() ),
+                    ( format!( "y" ),      y.to_owned() ),
+                    ( format!( "width" ),  width.to_owned() ),
+                    ( format!( "height" ), height.to_owned() )
+                ] )
+            }
+        );
+
+        let properties = object.descendants().find( | node | node.tag_name() == "properties".into() ).ok_or( "invalid file: no properties in object" )?;
+        let properties = properties.descendants().filter( | node | node.tag_name() == "property".into() && node.attribute( "name" ).unwrap_or( "" ).starts_with( "reskit-component" ) );
+        for component_property in properties {
+            let name = component_property.attribute( "name" ).ok_or( "internal error: name attribute expected" )?;
+            let prop_type = component_property.attribute( "type" ).unwrap_or( "string" );
+            let value = component_property.attribute( "value" );
+
+            if let Some( value ) = value {
+                // Set up regex to remove individual parts
+                let regex = Regex::new( r#"reskit-component\[([a-z0-9_]+)\](\.[a-z0-9_]*)?"# )?;
+                if let Some( captures ) = regex.captures( name ) {
+                    let component_name = captures.get( 1 ).ok_or( "internal error: regex did not match properly" )?.as_str();
+                    let attribute_name = captures.get( 2 );
+
+                    if let Some( attribute_name ) = attribute_name {
+                        // Setting is a component attribute setting ("value" is the setting)
+                        let attribute_name = attribute_name.as_str().replace( ".", "" );
+                        if let Some( component ) = entity.components.get_mut( component_name ) {
+                            component.attributes.insert( attribute_name, value.to_owned() );
+                        } else {
+                            return Err( format!( "in object {}: undefined component in reskit-component definition \"{}\"", object_name, name ) )?;
+                        }
+                    } else {
+                        // Setting is a component definition
+                        if prop_type != "bool" {
+                            print_warning( &format!( "in object {}: non-bool type reskit-component definition \"{}\". ignoring...", object_name, name ) );
+                        } else {
+                            if value == "true" {
+                                if entity.components.contains_key( component_name ) {
+                                    print_warning( &format!( "in object {}: duplicate reskit-component definition \"{}\". ignoring...", object_name, name ) );
+                                } else {
+                                    entity.components.insert(
+                                        component_name.to_owned(),
+                                        Component { attributes: HashMap::new() }
+                                    );
+                                }
+                            } else {
+                                print_warning( &format!( "in object {}: reskit-component definition \"{}\" is set to false. ignoring...", object_name, name ) );
+                            }
+                        }
+                    }
+                } else {
+                    print_warning( &format!( "in object {}: invalid format for reskit-component attribute \"{}\". ignoring...", object_name, name ) );
+                }
+            } else {
+                print_warning( &format!( "in object {}: no value for reskit-component attribute \"{}\". ignoring...", object_name, name ) );
+            }
+        }
+
+        entities.push( entity );
+    }
+
+    Ok( entities )
+}

src/reskit/level/mod.rs

@@ -0,0 +1,4 @@
+pub mod converter;
+pub mod dmapack;
+pub mod ecs;
+pub mod system;

src/reskit/level/system.rs

@@ -0,0 +1,432 @@
+use std::{error::Error, collections::HashMap};
+use image::GenericImageView;
+use crate::reskit::{tileset::image_to_tiles, utility::{symbol_to_pascal, print_info}, cli::settings::TileOrder};
+use super::{converter::{TiledTilemap, Layer, SystemPlane, TiledTileset}, dmapack::get_buckets};
+
+/**
+ * Output the .bin and .pal file (using `tileset` tool to build it) containing each of the tiles
+ * and palettes in the Tiled Editor tileset.
+ */
+pub fn get_tiles( tilemap: &TiledTilemap ) -> Result<(Vec<u8>, Vec<u8>), Box<dyn Error>> {
+    let mut system_pals: [[u16; 16]; 4] = [
+        [ 0; 16 ],
+        [ 0; 16 ],
+        [ 0; 16 ],
+        [ 0; 16 ]
+    ];
+    let mut all_tiles: Vec<u8> = vec![0; 32];   // --system md, start with a blank buffer tile
+
+    for tileset in &tilemap.tileset {
+        let tiles_height = tileset.image.height() / 8;  // --system md
+        let tiles_width = tileset.image.width() / 8;    // --system md
+
+        // all this copy pasted code, it's so over
+        if matches!( tileset.tile_order, TileOrder::Sprite ) {
+            // Sprite iteration order
+            for tile_x in 0..tiles_width {
+                for tile_y in 0..tiles_height {
+                    let tile_index = ( tile_y * tiles_width ) + tile_x;
+                    let tile = tileset.image.clone().crop( tile_x * 8, tile_y * 8, 8, 8 );
+
+                    // Fake palette (see below)
+                    let mut fake: [u16; 16] = [ 0; 16 ];
+                    let selected_pal = tileset.palettes[ tile_index as usize ];
+
+                    let tile_bin = image_to_tiles(
+                        &tile,
+                        {
+                            // Determine if palette is used here or it is a dummy palette
+                            if let Some( selected_pal ) = selected_pal {
+                                &mut system_pals[ selected_pal as usize ]
+                            } else {
+                                // Fake-a-palette
+                                // You will get an error in get_tilemap if you try to use this palette-less tile
+                                &mut fake
+                            }
+                        },
+                        "tile"  // this is not set to "sprite" because we're only doing one tile at a time
+                    );
+
+                    if let Err( _ ) = tile_bin {
+                        return Err( format!( "palette {:?} full (try moving tile {} to another palette)", selected_pal, tile_index ) )?
+                    }
+
+                    if let Ok( tile_bin ) = tile_bin {
+                        all_tiles.extend( tile_bin );
+                    }
+                }
+            }
+        } else {
+            // Tile iteration order
+            for tile_y in 0..tiles_height {
+                for tile_x in 0..tiles_width {
+                    let tile_index = ( tile_y * tiles_width ) + tile_x;
+                    let tile = tileset.image.clone().crop( tile_x * 8, tile_y * 8, 8, 8 );
+
+                    // Fake palette (see below)
+                    let mut fake: [u16; 16] = [ 0; 16 ];
+                    let selected_pal = tileset.palettes[ tile_index as usize ];
+
+                    let tile_bin = image_to_tiles(
+                        &tile,
+                        {
+                            // Determine if palette is used here or it is a dummy palette
+                            if let Some( selected_pal ) = selected_pal {
+                                &mut system_pals[ selected_pal as usize ]
+                            } else {
+                                // Fake-a-palette
+                                // You will get an error in get_tilemap if you try to use this palette-less tile
+                                &mut fake
+                            }
+                        },
+                        "tile"
+                    );
+
+                    if let Err( _ ) = tile_bin {
+                        return Err( format!( "palette {:?} full (try moving tile {} to another palette)", selected_pal, tile_index ) )?
+                    }
+
+                    if let Ok( tile_bin ) = tile_bin {
+                        all_tiles.extend( tile_bin );
+                    }
+                }
+            }
+        }
+    }
+
+    // Define result and write palettes
+    let mut palettes: Vec<u8> = Vec::new();
+    for pal in 0..system_pals.len() {
+        for i in 0..system_pals[ pal ].len() {
+            let bytes = system_pals[ pal ][ i ].to_be_bytes();
+            for i in 0..2 {
+                palettes.push( bytes[ i ] );
+            }
+        }
+    }
+
+    Ok( ( all_tiles, palettes ) )
+}
+
+/**
+ * Get the .map file containing `dmapack`-formatted metatiles, as well as B and A metatile-based maps.
+ *
+ * Format:
+ * <<< HEADER >>>
+ * 2 bytes: The offset to the instances table
+ * 2 bytes: The number of metatiles in the `dmapack` structure
+ * For each metatile:
+ * 2 bytes: Metatile width
+ * 2 bytes: Metatile height
+ * 2 bytes: Offset into `dmapack` buckets pointing directly to the metatile
+ *
+ * <<< DEFINITIONS >>>
+ * For each `dmapack` bucket:
+ * Contents of the `dmapack` bucket. Use offsets in headers to access metatiles in `dmapack`
+ * buckets located in this block.
+ *
+ * <<< INSTANCES >>>
+ * For B, then A layers:
+ * 2 bytes: Number of metatile instances in this layer.
+ * For each metatile instance:
+ * 2 bytes: Metatile ID.
+ * 2 bytes: X coordinate (world, divide by 8 to get tile coordinate).
+ * 2 bytes: Y coordinate (world, divide by 8 to get tile coordinate).
+ */
+pub fn get_metatile_maps( tilemap: &TiledTilemap ) -> Result<Vec<u8>, Box<dyn Error>> {
+    print_info( &format!( "number of metatiles: {}", tilemap.metatiles.len() ) );
+
+    // Assemble header of offsets
+    let header_offset = ( tilemap.metatiles.len() * 6 ) + 4;
+    let mut header: Vec<u8> = vec![];
+
+    // Get offsets for each bucket
+    let buckets = get_buckets( tilemap )?;
+    let mut bucket_offsets: HashMap<u16, usize> = HashMap::new();
+    let mut total_offset = header_offset;
+    for ( bucket_id, bucket ) in &buckets {
+        print_info( &format!( "bucket {} is of size {}", bucket_id, bucket.len() ) );
+        bucket_offsets.insert( *bucket_id, total_offset );
+        total_offset += bucket.len();
+    }
+
+    // Get the offset for each metatile within the buckets
+    let mut index = 0;
+    for metatile in &tilemap.metatiles {
+        let bucket_offset = bucket_offsets.get( &metatile.pack.bucket ).ok_or( "internal error: no offset for dmapack bucket" )?;
+        let cell_x = metatile.pack.slot[ 0 ];
+        let cell_y = metatile.pack.slot[ 1 ];
+
+        let metatile_byte_offset: u16 = *bucket_offset as u16 + ( ( ( cell_y * 64 ) + cell_x ) * 2 );
+        header.extend( metatile.width.to_be_bytes() );
+        header.extend( metatile.height.to_be_bytes() );
+        header.extend( metatile_byte_offset.to_be_bytes() );
+
+        print_info( &format!( "metatile {}: width {} height {} file offset {}", index, metatile.width, metatile.height, metatile_byte_offset ) );
+        index += 1;
+    }
+
+    // Assemble definitions
+    let mut definitions: Vec<u8> = vec![];
+    let mut wasted_space: usize = 0;
+    for ( _, bucket ) in &buckets {
+        for cell in bucket {
+            if let Some( nametable_entry ) = cell {
+                definitions.extend( nametable_entry.to_be_bytes() );
+            } else {
+                definitions.extend( ( 0 as u16 ).to_be_bytes() );
+                wasted_space += 1;
+            }
+        }
+    }
+
+    print_info( &format!( "total dmapack unused space is {} bytes", wasted_space ) );
+
+    // Assemble instances
+    let mut instances: Vec<u8> = vec![];
+
+    let layer_b: Option<&Layer> = tilemap.layers.iter().find( | layer | matches!( layer, Layer::Metatile { system_plane: SystemPlane::MdPlaneB, tiles: _ } ) );
+    if let Some( layer_b ) = layer_b {
+        let tiles = match layer_b { Layer::Metatile { system_plane: _, tiles } => tiles };
+        let mut subdefinitions: Vec<u8> = vec![];
+
+        for tile_y in 0..tilemap.height {
+            for tile_x in 0..tilemap.width {
+                let item_at = tiles.get( ( tile_y * tilemap.width ) + tile_x ).ok_or( "internal error: tilemap does not correlate to width/height" )?;
+                if *item_at != 0 {
+                    let metatile = tilemap.metatiles.iter().find( | metatile | metatile.id == *item_at ).ok_or( "invalid file: metatile definition not found" )?;
+
+                    // What index-ID was that?
+                    let index_id = tilemap.metatiles.iter().position( | metatile | metatile.id == *item_at ).ok_or( "invalid file: metatile id not found" )?;
+
+                    // Write the data to subdefinitions
+                    print_info( &format!( "plane B metatile instance: id {}, x {}, y {}", index_id, ( ( tile_x * 8 ) as u16 ), ( ( ( tile_y - ( metatile.height as usize - 1 ) ) * 8 ) as u16 ) ) );
+                    subdefinitions.extend( ( index_id as u16 ).to_be_bytes() );
+                    subdefinitions.extend( ( ( tile_x * 8 ) as u16 ).to_be_bytes() );
+                    subdefinitions.extend( ( ( ( tile_y - ( metatile.height as usize - 1 ) ) * 8 ) as u16 ).to_be_bytes() );
+                }
+            }
+        }
+
+        instances.extend( ( ( subdefinitions.len() / 6 ) as u16 ).to_be_bytes() );
+        instances.extend( subdefinitions );
+    } else {
+        instances.extend( ( 0 as u16 ).to_be_bytes() );
+    }
+
+    let layer_a: Option<&Layer> = tilemap.layers.iter().find( | layer | matches!( layer, Layer::Metatile { system_plane: SystemPlane::MdPlaneA, tiles: _ } ) );
+    if let Some( layer_a ) = layer_a {
+        let tiles = match layer_a { Layer::Metatile { system_plane: _, tiles } => tiles };
+        let mut subdefinitions: Vec<u8> = vec![];
+
+        for tile_y in 0..tilemap.height {
+            for tile_x in 0..tilemap.width {
+                let item_at = tiles.get( ( tile_y * tilemap.width ) + tile_x ).ok_or( "internal error: tilemap does not correlate to width/height" )?;
+                if *item_at != 0 {
+                    let metatile = tilemap.metatiles.iter().find( | metatile | metatile.id == *item_at ).ok_or( "invalid file: metatile definition not found" )?;
+
+                    // What index-ID was that?
+                    let index_id = tilemap.metatiles.iter().position( | metatile | metatile.id == *item_at ).ok_or( "invalid file: metatile id not found" )?;
+
+                    // Write the data to subdefinitions
+                    print_info( &format!( "plane A metatile instance: id {}, x {}, y {}", index_id, ( ( tile_x * 8 ) as u16 ), ( ( ( tile_y - ( metatile.height as usize - 1 ) ) * 8 ) as u16 ) ) );
+                    subdefinitions.extend( ( index_id as u16 ).to_be_bytes() );
+                    subdefinitions.extend( ( ( tile_x * 8 ) as u16 ).to_be_bytes() );
+                    subdefinitions.extend( ( ( ( tile_y - ( metatile.height as usize - 1 ) ) * 8 ) as u16 ).to_be_bytes() );
+                }
+            }
+        }
+
+        instances.extend( ( ( subdefinitions.len() / 6 ) as u16 ).to_be_bytes() );
+        instances.extend( subdefinitions );
+    } else {
+        instances.extend( ( 0 as u16 ).to_be_bytes() );
+    }
+
+    // Write the final result
+    let mut result: Vec<u8> = vec![];
+    let offset_to_instances = header_offset + definitions.len();
+    result.extend( ( offset_to_instances as u16 ).to_be_bytes() );
+    let num_metatiles: u16 = tilemap.metatiles.len() as u16;
+    result.extend( num_metatiles.to_be_bytes() );
+    result.extend( header );
+    result.extend( definitions );
+    result.extend( instances );
+
+    Ok( result )
+}
+
+pub 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;
+
+    for tileset in tilesets {
+        if tileset.source == target_source {
+            return Ok( ( index, tileset.palettes.clone() ) )
+        } else {
+            index += ( ( tileset.image.width() / 8 ) * ( tileset.image.height() / 8 ) ) as usize;
+        }
+    }
+
+    Err( format!( "internal error: could not find metatile with target source \"{}\"", target_source ) )?
+}
+
+/**
+ * Get the .lvc collision map (u8 sized for the map dimensions, collision areas are either 0 or 1)
+ */
+pub fn get_collision_map( tilemap: &TiledTilemap ) -> Result<Vec<u8>, Box<dyn Error>> {
+    let mut result: Vec<u8> = Vec::new();
+
+    // 2 bytes: Number of bounding boxes
+    result.extend( ( tilemap.collision.len() as u16 ).to_be_bytes() );
+
+    // For (Number of bounding boxes):
+    for bounding_box in &tilemap.collision {
+        // 2 bytes: X dimension
+        result.extend( bounding_box.origin.x.to_be_bytes() );
+
+        // 2 bytes: Y dimension
+        result.extend( bounding_box.origin.y.to_be_bytes() );
+
+        // 2 bytes: X2 dimension (x + width)
+        result.extend( ( bounding_box.origin.x + bounding_box.size.width ).to_be_bytes() );
+
+        // 2 bytes: Y2 dimension (y + height)
+        result.extend( ( bounding_box.origin.y + bounding_box.size.height ).to_be_bytes() );
+    }
+
+    Ok( result )
+}
+
+pub fn get_objs( tilemap: &TiledTilemap, symbol_ids: &HashMap<String, u16> ) -> Result<Vec<u8>, Box<dyn Error>> {
+    let mut result: Vec<u8> = Vec::new();
+
+    // 2 bytes: Number of objects
+    result.extend( ( tilemap.objects.len() as u16 ).to_be_bytes() );
+
+    if tilemap.objects.len() > 0 {
+        let archetype = tilemap.objects.first().ok_or( "internal error: no first object" )?;
+
+        // 2 bytes: Object struct size
+        result.extend( ( ( archetype.attributes.len() + 1 ) as u16 ).to_be_bytes() );
+
+        // For (number of objects):
+        for object in &tilemap.objects {
+            // (Object struct size * 2): Data for object, ordered by --fields option, each one 16-bit field
+
+            // First output the object ID
+            let object_id = symbol_ids.get( &object.id ).ok_or( format!( "invalid file: undefined symbol \"{}\"", object.id ) )?;
+            result.extend( object_id.to_be_bytes() );
+
+            // Then output the attributes in the order provided via LinkedHashMap
+            for ( _attribute, value ) in &object.attributes {
+                let value: u16 = match value.as_str() {
+                    "true" => 0x01,
+                    "false" => 0x00,
+                    all_else => {
+                        if let Ok( valid_u16 ) = all_else.parse::<u16>() {
+                            valid_u16
+                        } else {
+                            *symbol_ids.get( all_else ).ok_or( format!( "invalid file: undefined symbol \"{}\"", all_else ) )?
+                        }
+                    }
+                };
+
+                result.extend( value.to_be_bytes() );
+            }
+        }
+    }
+
+    Ok( result )
+}
+
+/**
+ * Get the sprite table.
+ */
+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 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 ) )?;
+        result.extend( sprite_id.to_be_bytes() );
+
+        let tiles_across = sprite.image.width() / 8;
+        let frames: u16 = ( tiles_across / ( sprite_metadata.width as u32 ) ) as u16;
+
+        result.extend( ( index as u16 ).to_be_bytes() );
+
+        result.push( sprite_metadata.width );
+
+        result.push( sprite_metadata.height );
+
+        result.extend( sprite_metadata.palette.to_be_bytes() );
+
+        // One animation per .tsx file
+        // Animations run like a filmstrip across, never down
+        result.extend( frames.to_be_bytes() );
+
+        if let Some( jiffies ) = sprite_metadata.anim_interval {
+            result.extend( jiffies.to_be_bytes() );
+        } else {
+            result.extend( ( 0 as u16 ).to_be_bytes() );
+        };
+    }
+
+    Ok( result )
+}
+
+/**
+ * Get a helper .asm or .c file that ties all the level components together
+ */
+pub fn get_code( tilemap: &TiledTilemap, level_name: &str, path_prefix: &str ) -> Result<String, Box<dyn Error>> {
+    let version = env!( "CARGO_PKG_VERSION" );
+    let level_label = symbol_to_pascal( level_name );
+    let ( width, height ) = ( tilemap.width, tilemap.height );
+    let num_tiles = {
+        let mut total_tiles = 1;
+
+        for tileset in &tilemap.tileset {
+            total_tiles += ( tileset.image.width() / 8 ) * ( tileset.image.height() / 8 );     // --system md
+        }
+
+        total_tiles
+    };
+    let file = format!( r#"; Level definition file
+; Generated by reskit v{version}
+
+{level_label}Tiles:
+    incbin '{path_prefix}{level_name}/tiles.bin'
+
+{level_label}Palettes:
+    incbin '{path_prefix}{level_name}/palettes.pal'
+
+{level_label}Nametables:
+    incbin '{path_prefix}{level_name}/nametables.map'
+
+{level_label}Collision:
+    incbin '{path_prefix}{level_name}/collision.lvc'
+
+{level_label}Objects:
+    incbin '{path_prefix}{level_name}/objects.obs'
+
+{level_label}Sprites:
+    incbin  '{path_prefix}{level_name}/sprites.spt'
+
+{level_label}:
+    dc.w    {width}, {height}, {num_tiles}
+    dc.l    {level_label}Tiles
+    dc.l    {level_label}Palettes
+    dc.l    {level_label}Nametables
+    dc.l    {level_label}Collision
+    dc.l    {level_label}Objects
+    dc.l    {level_label}Sprites"# );
+
+    Ok( file )
+}

src/reskit/mod.rs

@@ -1,4 +1,6 @@
 pub mod cli;
+pub mod easing;
+pub mod level;
 pub mod soundtrack;
 pub mod tileset;
 pub mod utility;

src/reskit/tileset.rs

@@ -1,20 +1,50 @@
 use crate::reskit::utility;
-use std::process::exit;
+use std::{error::Error, ops::RangeInclusive};
 use std::fs;
 use std::fs::File;
 use std::io::Write;
 use image::{ GenericImageView, DynamicImage };
 
-fn color_to_palette( r: u16, g: u16, b: u16, palette: &mut [u16; 16] ) -> u32 {
+/**
+ * Get a particular RGB component adjusted for the Mega Drive VDP colour ramp.
+ * See colour ramp at https://plutiedev.com/vdp-color-ramp
+ */
+fn rgb_component_to_ramp( component: u16 ) -> Result<u16, Box<dyn Error>> {
+	let ramp: [(RangeInclusive<u16>, (u16,u16)); 7] = [
+		(0..=52,    (0x0, 0x2)),
+		(52..=87,   (0x2, 0x4)),
+		(87..=116,  (0x4, 0x6)),
+		(116..=144, (0x6, 0x8)),
+		(144..=172,	(0x8, 0xA)),
+		(172..=206, (0xA, 0xC)),
+		(206..=255, (0xC, 0xE))
+	];
+
+	for i in 0..ramp.len() {
+		let ( ramp_range, ( cram_round_down, cram_round_up ) ) = &ramp[ i ];
+		if ramp_range.contains( &component ) {
+			let range_midpoint = ramp_range.start() + ( ( ramp_range.end() - ramp_range.start() ) / 2 );
+			return if component >= range_midpoint {
+				Ok( *cram_round_up )
+			} else {
+				Ok( *cram_round_down )
+			}
+		}
+	}
+
+	Err( "rgb component not in range 0-255" )?
+}
+
+pub fn color_to_palette( r: u16, g: u16, b: u16, palette: &mut [u16; 16] ) -> Result<u32, Box<dyn Error>> {
 	let final_val =
-		( ( r & 0x00F0 ) >> 4 ) |
+		( rgb_component_to_ramp( b )? << 8 ) |
-		( g & 0x00F0 ) |
+		( rgb_component_to_ramp( g )? << 4 ) |
-		( ( b & 0x00F0 ) << 4 );
+		( rgb_component_to_ramp( r )? );
 
 	// Does the color already exist?
 	for i in 0..palette.len() {
 		if palette[ i ] == final_val {
-			return i as u32;
+			return Ok( i as u32 );
 		}
 	}
 
@@ -22,26 +52,26 @@ fn color_to_palette( r: u16, g: u16, b: u16, palette: &mut [u16; 16] ) -> u32 {
 	for i in 1..palette.len() {
 		if palette[ i ] == 0 {
 			palette[ i ] = final_val;
-			return i as u32;
+			return Ok( i as u32 );
 		}
 	}
 
-	utility::print_error( "image contains greater than 15 colours, exiting..." );
+	utility::print_error( "attempted to insert greater than 15 colours in a palette" );
-	exit( 3 );
+	Err( "no more room in this palette!" )?
 }
 
-fn get_pixel( image: &DynamicImage, palette: &mut [u16; 16], x: u32, y: u32 ) -> u32 {
+fn get_pixel( image: &DynamicImage, palette: &mut [u16; 16], x: u32, y: u32 ) -> Result<u32, Box<dyn Error>> {
 	let ( max_x, max_y ) = image.dimensions();
 
 	if x >= max_x || y >= max_y {
-		return 0;
+		return Ok( 0 );
 	}
 
 	let pixel = image.get_pixel( x, y );
 	color_to_palette( pixel[ 0 ].into(), pixel[ 1 ].into(), pixel[ 2 ].into(), palette )
 }
 
-fn output_bin( image_filename: &str, output_filename: &str, palette: [u16; 16], body: Vec<u8> ) {
+pub fn output_bin( output_filename: &str, palette: [u16; 16], body: Vec<u8> ) -> Result<(), Box<dyn Error>> {
 	let mut output_palette: Vec< u8 > = Vec::new();
 	for i in 0..palette.len() {
 		let bytes = palette[ i ].to_be_bytes();
@@ -54,13 +84,14 @@ fn output_bin( image_filename: &str, output_filename: &str, palette: [u16; 16],
 	if let Ok( mut output_file ) = output_try {
 		output_file.write( &output_palette ).unwrap();
 		output_file.write( &body ).unwrap();
-		utility::print_good( format!( "converted file {}", image_filename ).as_str() );
+
+		Ok( () )
 	} else {
-		utility::print_error( format!( "could not open filename for output {}", output_filename ).as_str() );
+		return Err( format!( "could not open filename for output {}", output_filename ).as_str() )?;
 	}
 }
 
-fn output_inc( image_filename: &str, output_filename: &str, palette: [u16; 16], body: Vec<u8> ) {
+pub fn output_inc( output_filename: &str, palette: [u16; 16], body: Vec<u8> ) -> Result<(), Box<dyn Error>> {
 	let mut output_palette: Vec< u8 > = Vec::new();
 	for i in 0..palette.len() {
 		let bytes = palette[ i ].to_be_bytes();
@@ -111,75 +142,91 @@ fn output_inc( image_filename: &str, output_filename: &str, palette: [u16; 16],
 	fs::write( output_filename.to_string() + ".h", output_h ).expect( "Could not write header file" );
 	fs::write( output_filename.to_string() + ".c", output_c ).expect( "Could not write source file" );
 
-	utility::print_good( format!( "converted file {}", image_filename ).as_str() );
+	Ok( () )
 }
 
-pub fn generate( image_filename: &str, output_filename: &str, output_mode: &str, tile_order: &str ) {
+pub fn image_to_tiles( img: &DynamicImage, palette: &mut [u16; 16], tile_order: &str ) -> Result<Vec<u8>, Box<dyn Error>> {
-	let img = image::open( image_filename );
+	let ( mut max_x, mut max_y ) = img.dimensions();
-	if let Ok( img ) = img {
+	if max_x % 8 != 0 { max_x = ( 8 * ( max_x / 8 ) ) + ( 8 - ( max_x % 8 ) ); }
-		let ( mut max_x, mut max_y ) = img.dimensions();
+	if max_y % 8 != 0 {	max_y = ( 8 * ( max_y / 8 ) ) + ( 8 - ( max_y % 8 ) ); }
-		if max_x % 8 != 0 { max_x = ( 8 * ( max_x / 8 ) ) + ( 8 - ( max_x % 8 ) ); }
-		if max_y % 8 != 0 {	max_y = ( 8 * ( max_y / 8 ) ) + ( 8 - ( max_y % 8 ) ); }
 
-		let mut palette: [u16; 16] = [ 0; 16 ];
+	let mut body: Vec<u8> = Vec::new();
-		let mut body: Vec< u8 > = Vec::new();
 
-		if tile_order == "sprite" {
+	if tile_order == "sprite" {
-			/*
+		/*
-			 * Tile order:
+		 * Sprite order:
-			 * 1 3
+		 * 1 3
-			 * 2 4
+		 * 2 4
-			 */
+		 */
-			 for x in ( 0..max_x ).step_by( 8 ) {
+		 for x in ( 0..max_x ).step_by( 8 ) {
-				for y in ( 0..max_y ).step_by( 8 ) {
-					for cell_y in 0..8 {
-						let mut series: u32 = 0;
-
-						for cell_x in 0..8 {
-							let nibble: u32 = get_pixel( &img, &mut palette, cell_x + x, cell_y + y ) << ( ( 7 - cell_x ) * 4 );
-							series = series | nibble;
-						}
-
-						let bytes = series.to_be_bytes();
-						for i in 0..4 {
-							body.push( bytes[ i ] );
-						}
-					}
-				}
-			}
-		} else {
-			/*
-			 * Tile order:
-			 * 1 2
-			 * 3 4
-			 */
 			for y in ( 0..max_y ).step_by( 8 ) {
-				for x in ( 0..max_x ).step_by( 8 ) {
+				for cell_y in 0..8 {
-					for cell_y in 0..8 {
+					let mut series: u32 = 0;
-						let mut series: u32 = 0;
 
-						for cell_x in 0..8 {
+					for cell_x in 0..8 {
-							let nibble: u32 = get_pixel( &img, &mut palette, cell_x + x, cell_y + y ) << ( ( 7 - cell_x ) * 4 );
+						let nibble: u32 = get_pixel( &img, palette, cell_x + x, cell_y + y )? << ( ( 7 - cell_x ) * 4 );
-							series = series | nibble;
+						series = series | nibble;
-						}
+					}
 
-						let bytes = series.to_be_bytes();
+					let bytes = series.to_be_bytes();
-						for i in 0..4 {
+					for i in 0..4 {
-							body.push( bytes[ i ] );
+						body.push( bytes[ i ] );
-						}
 					}
 				}
 			}
 		}
+	} else {
+		/*
+		 * Tile order:
+		 * 1 2
+		 * 3 4
+		 */
+		for y in ( 0..max_y ).step_by( 8 ) {
+			for x in ( 0..max_x ).step_by( 8 ) {
+				for cell_y in 0..8 {
+					let mut series: u32 = 0;
+
+					for cell_x in 0..8 {
+						let nibble: u32 = get_pixel( &img, palette, cell_x + x, cell_y + y )? << ( ( 7 - cell_x ) * 4 );
+						series = series | nibble;
+					}
+
+					let bytes = series.to_be_bytes();
+					for i in 0..4 {
+						body.push( bytes[ i ] );
+					}
+				}
+			}
+		}
+	}
+
+	Ok( body )
+}
+
+pub fn generate( image_filename: &str, output_filename: &str, output_mode: &str, tile_order: &str ) -> Result<(), Box<dyn Error>> {
+	let img = image::open( image_filename );
+	if let Ok( img ) = img {
+		let mut palette: [u16; 16] = [ 0; 16 ];
+		let body = image_to_tiles( &img, &mut palette, tile_order )?;
 
 		if output_mode == "bin" {
-			output_bin( image_filename, output_filename, palette, body );
+			if let Err( err ) = output_bin( output_filename, palette, body ) {
+				utility::print_error( &format!( "{}", err ) );
+			}
+
+			utility::print_good( format!( "converted file {}", image_filename ).as_str() );
 		} else if output_mode == "inc" {
-			output_inc( image_filename, output_filename, palette, body );
+			if let Err( err ) = output_inc( output_filename, palette, body ) {
+				utility::print_error( &format!( "{}", err ) );
+			}
+
+			utility::print_good( format!( "converted file {}", image_filename ).as_str() );
 		} else {
 			utility::print_error( format!( "invalid output mode {}", output_mode ).as_str() );
 		}
 	} else {
 		utility::print_error( format!( "could not open filename {}", image_filename ).as_str() );
 	}
+
+	Ok( () )
 }