Merge pull request #92 from gwilymk/proc-macro-for-agb-image-converter

Proc macro for agb image converter

agb-image-converter/Cargo.lock

@@ -13,7 +13,11 @@ name = "agb_image_converter"
 version = "0.4.0"
 dependencies = [
  "image",
- "typed-builder",
+ "proc-macro2",
+ "quote",
+ "serde",
+ "syn",
+ "toml",
 ]
 
 [[package]]
@@ -166,6 +170,26 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "serde"
+version = "1.0.126"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec7505abeacaec74ae4778d9d9328fe5a5d04253220a85c4ee022239fc996d03"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.126"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "963a7dbc9895aeac7ac90e74f34a5d5261828f79df35cbed41e10189d3804d43"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "syn"
 version = "1.0.73"
@@ -178,14 +202,12 @@ dependencies = [
 ]
 
 [[package]]
-name = "typed-builder"
-version = "0.9.0"
+name = "toml"
+version = "0.5.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "345426c7406aa355b60c5007c79a2d1f5b605540072795222f17f6443e6a9c6f"
+checksum = "a31142970826733df8241ef35dc040ef98c679ab14d7c3e54d827099b3acecaa"
 dependencies = [
- "proc-macro2",
- "quote",
- "syn",
+ "serde",
 ]
 
 [[package]]

agb-image-converter/Cargo.toml

@@ -6,6 +6,13 @@ edition = "2018"
 license = "MPL-2.0"
 description = "Library for converting graphics for use on the Game Boy Advance"
 
+[lib]
+proc-macro = true
+
 [dependencies]
 image = { version = "0.23.14", default-features = false, features = [ "png", "bmp" ] }
-typed-builder = "0.9.0"
+toml = "0.5.8"
+serde = { version = "1.0", features = ["derive"] }
+syn = "1.0.73"
+proc-macro2 = "1.0.27"
+quote = "1.0.9"

agb-image-converter/src/bin/convert.rs

@@ -1,17 +0,0 @@
-use std::env;
-
-use agb_image_converter::{convert_image, ImageConverterConfig, TileSize};
-
-fn main() {
-    let args: Vec<_> = env::args().collect();
-
-    let file_path = &args[1];
-    let output_path = &args[2];
-    convert_image(
-        ImageConverterConfig::builder()
-            .tile_size(TileSize::Tile8)
-            .input_image(file_path.into())
-            .output_file(output_path.into())
-            .build(),
-    );
-}

agb-image-converter/src/config.rs

@@ -0,0 +1,105 @@
+use serde::Deserialize;
+use std::collections::HashMap;
+use std::fs;
+
+use crate::{Colour, TileSize};
+
+pub(crate) fn parse(filename: &str) -> Box<dyn Config> {
+    let config_toml =
+        fs::read_to_string(filename).unwrap_or_else(|_| panic!("Failed to read file {}", filename));
+
+    let config: ConfigV1 = toml::from_str(&config_toml).expect("Failed to parse file");
+
+    if config.version != "1.0" {
+        panic!(
+            "Expected version of {} to be 1.0, got {}",
+            filename, config.version
+        );
+    }
+
+    Box::new(config)
+}
+
+pub(crate) trait Config {
+    fn crate_prefix(&self) -> String;
+    fn images(&self) -> HashMap<String, &dyn Image>;
+}
+
+pub(crate) trait Image {
+    fn filename(&self) -> String;
+    fn transparent_colour(&self) -> Option<Colour>;
+    fn tilesize(&self) -> TileSize;
+}
+
+#[derive(Deserialize)]
+pub struct ConfigV1 {
+    version: String,
+    crate_prefix: Option<String>,
+
+    image: HashMap<String, ImageV1>,
+}
+
+impl Config for ConfigV1 {
+    fn crate_prefix(&self) -> String {
+        self.crate_prefix
+            .clone()
+            .unwrap_or_else(|| "agb".to_owned())
+    }
+
+    fn images(&self) -> HashMap<String, &dyn Image> {
+        self.image
+            .iter()
+            .map(|(filename, image)| (filename.clone(), image as &dyn Image))
+            .collect()
+    }
+}
+
+#[derive(Deserialize)]
+pub struct ImageV1 {
+    filename: String,
+    transparent_colour: Option<String>,
+    tile_size: TileSizeV1,
+}
+
+impl Image for ImageV1 {
+    fn filename(&self) -> String {
+        self.filename.clone()
+    }
+
+    fn transparent_colour(&self) -> Option<Colour> {
+        if let Some(colour) = &self.transparent_colour {
+            if colour.len() != 6 {
+                panic!("Expected colour to be 6 characters, got {}", colour);
+            }
+
+            let r = u8::from_str_radix(&colour[0..2], 16).unwrap();
+            let g = u8::from_str_radix(&colour[2..4], 16).unwrap();
+            let b = u8::from_str_radix(&colour[4..6], 16).unwrap();
+
+            return Some(Colour::from_rgb(r, g, b));
+        }
+
+        None
+    }
+
+    fn tilesize(&self) -> TileSize {
+        self.tile_size.into()
+    }
+}
+
+#[derive(Deserialize, Clone, Copy)]
+pub enum TileSizeV1 {
+    #[serde(rename = "8x8")]
+    Tile8,
+    #[serde(rename = "16x16")]
+    Tile16,
+}
+
+impl From<TileSizeV1> for TileSize {
+    fn from(item: TileSizeV1) -> Self {
+        match item {
+            TileSizeV1::Tile8 => TileSize::Tile8,
+            TileSizeV1::Tile16 => TileSize::Tile16,
+        }
+    }
+}

agb-image-converter/src/lib.rs

@@ -1,20 +1,22 @@
-use std::fs::File;
-use std::io::BufWriter;
-use std::path::PathBuf;
+use proc_macro::TokenStream;
+use syn::parse_macro_input;
 
-use typed_builder::TypedBuilder;
+use std::path::Path;
+
+use quote::{format_ident, quote};
 
 mod colour;
+mod config;
 mod image_loader;
 mod palette16;
 mod rust_generator;
 
 use image_loader::Image;
 
-pub use colour::Colour;
+use colour::Colour;
 
 #[derive(Debug, Clone, Copy)]
-pub enum TileSize {
+pub(crate) enum TileSize {
     Tile8,
     Tile16,
 }
@@ -28,40 +30,69 @@ impl TileSize {
     }
 }
 
-#[derive(TypedBuilder)]
-pub struct ImageConverterConfig {
-    #[builder(default, setter(strip_option))]
-    transparent_colour: Option<Colour>,
-    tile_size: TileSize,
-    input_image: PathBuf,
-    output_file: PathBuf,
+#[proc_macro]
+pub fn include_gfx(input: TokenStream) -> TokenStream {
+    let input = parse_macro_input!(input as syn::LitStr);
 
-    #[builder(default, setter(strip_option))]
-    crate_prefix: Option<String>,
+    let filename = input.value();
+
+    let root = std::env::var("CARGO_MANIFEST_DIR").expect("Failed to get cargo manifest dir");
+    let path = Path::new(&root).join(&*filename);
+    let parent = path
+        .parent()
+        .expect("Expected a parent directory for the path");
+
+    let config = config::parse(&path.to_string_lossy());
+
+    let module_name = format_ident!(
+        "{}",
+        path.file_stem()
+            .expect("Expected a file stem")
+            .to_string_lossy()
+    );
+    let include_path = path.to_string_lossy();
+
+    let images = config.images();
+    let image_code = images.iter().map(|(image_name, &image)| {
+        convert_image(image, parent, &image_name, &config.crate_prefix())
+    });
+
+    let module = quote! {
+        pub mod #module_name {
+            const _: &[u8] = include_bytes!(#include_path);
+
+            #(#image_code)*
+        }
+    };
+
+    TokenStream::from(module)
 }
 
-pub fn convert_image(settings: ImageConverterConfig) {
-    let image = Image::load_from_file(&settings.input_image);
+fn convert_image(
+    settings: &dyn config::Image,
+    parent: &Path,
+    variable_name: &str,
+    crate_prefix: &str,
+) -> proc_macro2::TokenStream {
+    let image_filename = &parent.join(&settings.filename());
+    let image = Image::load_from_file(image_filename);
 
-    let tile_size = settings.tile_size.to_size();
+    let tile_size = settings.tilesize().to_size();
     if image.width % tile_size != 0 || image.height % tile_size != 0 {
         panic!("Image size not a multiple of tile size");
     }
 
     let optimiser = optimiser_for_image(&image, tile_size);
-    let optimisation_results = optimiser.optimise_palettes(settings.transparent_colour);
-
-    let output_file = File::create(&settings.output_file).expect("Failed to create file");
-    let mut writer = BufWriter::new(output_file);
+    let optimisation_results = optimiser.optimise_palettes(settings.transparent_colour());
 
     rust_generator::generate_code(
-        &mut writer,
+        variable_name,
         &optimisation_results,
         &image,
-        settings.tile_size,
-        settings.crate_prefix.unwrap_or("agb".to_owned()),
+        &image_filename.to_string_lossy(),
+        settings.tilesize(),
+        crate_prefix.to_owned(),
     )
-    .expect("Failed to write data");
 }
 
 fn optimiser_for_image(image: &Image, tile_size: usize) -> palette16::Palette16Optimiser {

agb-image-converter/src/rust_generator.rs

@@ -1,97 +1,87 @@
-use std::io;
-use std::io::Write;
-
 use crate::image_loader::Image;
 use crate::palette16::Palette16OptimisationResults;
 use crate::TileSize;
 
+use proc_macro2::TokenStream;
+use quote::{format_ident, quote};
+
+use std::iter;
+
 pub(crate) fn generate_code(
-    output: &mut dyn Write,
+    output_variable_name: &str,
     results: &Palette16OptimisationResults,
     image: &Image,
+    image_filename: &str,
     tile_size: TileSize,
     crate_prefix: String,
-) -> io::Result<()> {
-    writeln!(
-        output,
-        "pub const PALETTE_DATA: &[{}::display::palette16::Palette16] = &[",
-        crate_prefix,
-    )?;
+) -> TokenStream {
+    let crate_prefix = format_ident!("{}", crate_prefix);
+    let output_variable_name = format_ident!("{}", output_variable_name);
 
-    for palette in &results.optimised_palettes {
-        write!(
-            output,
-            "    {}::display::palette16::Palette16::new([",
-            crate_prefix
-        )?;
+    let palette_data = results.optimised_palettes.iter().map(|palette| {
+        let colours = palette
+            .clone()
+            .into_iter()
+            .map(|colour| colour.to_rgb15())
+            .chain(iter::repeat(0))
+            .take(16)
+            .map(|colour| colour as u16);
 
-        for colour in palette.clone() {
-            write!(output, "0x{:08x}, ", colour.to_rgb15())?;
+        quote! {
+            #crate_prefix::display::palette16::Palette16::new([
+                #(#colours),*
+            ])
         }
-
-        for _ in palette.clone().into_iter().len()..16 {
-            write!(output, "0x00000000, ")?;
-        }
-
-        writeln!(output, "]),")?;
-    }
-
-    writeln!(output, "];")?;
-    writeln!(output)?;
-
-    writeln!(output, "pub const TILE_DATA: &[u32] = &[",)?;
+    });
 
     let tile_size = tile_size.to_size();
 
     let tiles_x = image.width / tile_size;
     let tiles_y = image.height / tile_size;
 
+    let mut tile_data = vec![];
+
     for y in 0..tiles_y {
         for x in 0..tiles_x {
             let palette_index = results.assignments[y * tiles_x + x];
             let palette = &results.optimised_palettes[palette_index];
-            writeln!(
-                output,
-                "    /* {}, {} (palette index {}) */",
-                x, y, palette_index
-            )?;
             
             for inner_y in 0..tile_size / 8 {
-                write!(output, "    ")?;
-
                 for inner_x in 0..tile_size / 8 {
                     for j in inner_y * 8..inner_y * 8 + 8 {                        
-                        write!(output, "0x")?;
-
                         for i in (inner_x * 8..inner_x * 8 + 8).rev() {
                             let colour = image.colour(x * tile_size + i, y * tile_size + j);
-                            let colour_index = palette.colour_index(colour);
-
-                            write!(output, "{:x}", colour_index)?;
+                            tile_data.push(palette.colour_index(colour));
+                        }
+                    }
                 }
-
-                        write!(output, ", ")?;
             }
         }
     }
 
-            writeln!(output)?;
+    let tile_data = tile_data.chunks(8)
+        .map(|chunk| chunk.iter().fold(0u32, |acc, &x| (acc << 4) | (x as u32)));
+
+    let assignments = results.assignments.iter().map(|&x| x as u8);
+
+    quote! {
+        #[allow(non_upper_case_globals)]
+        pub const #output_variable_name: #crate_prefix::display::tile_data::TileData = {
+            const _: &[u8] = include_bytes!(#image_filename);
+
+            const PALETTE_DATA: &[#crate_prefix::display::palette16::Palette16] = &[
+                #(#palette_data),*
+            ];
+
+            const TILE_DATA: &[u32] = &[
+                #(#tile_data),*
+            ];
+
+            const PALETTE_ASSIGNMENT: &[u8] = &[
+                #(#assignments),*
+            ];
+
+            #crate_prefix::display::tile_data::TileData::new(PALETTE_DATA, TILE_DATA, PALETTE_ASSIGNMENT)
+        };
     }
 }
-
-    writeln!(output, "];")?;
-    writeln!(output)?;
-
-    write!(output, "pub const PALETTE_ASSIGNMENT: &[u8] = &[")?;
-
-    for (i, assignment) in results.assignments.iter().enumerate() {
-        if i % 16 == 0 {
-            write!(output, "\n    ")?;
-        }
-        write!(output, "{}, ", assignment)?;
-    }
-
-    writeln!(output, "\n];")?;
-
-    Ok(())
-}

agb/Cargo.lock

@@ -19,11 +19,13 @@ dependencies = [
 [[package]]
 name = "agb_image_converter"
 version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "63c48ea2b7f5bb3c4605234f6355218401a840055ce703602b8266076a1e6f30"
 dependencies = [
  "image",
- "typed-builder",
+ "proc-macro2",
+ "quote",
+ "serde",
+ "syn",
+ "toml",
 ]
 
 [[package]]
@@ -176,6 +178,26 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "serde"
+version = "1.0.126"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec7505abeacaec74ae4778d9d9328fe5a5d04253220a85c4ee022239fc996d03"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.126"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "963a7dbc9895aeac7ac90e74f34a5d5261828f79df35cbed41e10189d3804d43"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "syn"
 version = "1.0.73"
@@ -188,14 +210,12 @@ dependencies = [
 ]
 
 [[package]]
-name = "typed-builder"
-version = "0.9.0"
+name = "toml"
+version = "0.5.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "345426c7406aa355b60c5007c79a2d1f5b605540072795222f17f6443e6a9c6f"
+checksum = "a31142970826733df8241ef35dc040ef98c679ab14d7c3e54d827099b3acecaa"
 dependencies = [
- "proc-macro2",
- "quote",
- "syn",
+ "serde",
 ]
 
 [[package]]

agb/Cargo.toml

@@ -18,9 +18,7 @@ lto = true
 
 [dependencies]
 bitflags = "1.2"
-
-[build-dependencies]
-agb_image_converter = "0.4.0"
+agb_image_converter = { version = "0.4.0", path = "../agb-image-converter" }
 
 [package.metadata.docs.rs]
 default-target = "thumbv6m-none-eabi"

agb/build.rs

@@ -1,5 +1,3 @@
-use agb_image_converter::{convert_image, Colour, ImageConverterConfig, TileSize};
-
 fn main() {
     println!("cargo:rerun-if-changed=crt0.s");
     println!("cargo:rerun-if-changed=gba_mb.ld");
@@ -24,14 +22,4 @@ fn main() {
     }
 
     println!("cargo:rustc-link-search={}", out_dir);
-
-    convert_image(
-        ImageConverterConfig::builder()
-            .transparent_colour(Colour::from_rgb(1, 1, 1))
-            .tile_size(TileSize::Tile8)
-            .input_image("gfx/test_logo.png".into())
-            .output_file(format!("{}/test_logo.rs", out_dir).into())
-            .crate_prefix("crate".to_owned())
-            .build(),
-    );
 }

agb/examples/test_logo.rs

@@ -10,19 +10,7 @@ pub fn main() -> ! {
     let mut gba = agb::Gba::new();
     let mut gfx = gba.display.video.tiled0();
 
-    gfx.set_background_palettes(example_logo::PALETTE_DATA);
-    gfx.set_background_tilemap(0, example_logo::TILE_DATA);
-
-    let mut back = gfx.get_background().unwrap();
-
-    let mut entries: [u16; 30 * 20] = [0; 30 * 20];
-    for tile_id in 0..(30 * 20) {
-        let palette_entry = example_logo::PALETTE_ASSIGNMENT[tile_id as usize] as u16;
-        entries[tile_id as usize] = tile_id | (palette_entry << 12);
-    }
-
-    back.draw_full_map(&entries, (30_u32, 20_u32).into(), 0);
-    back.show();
+    example_logo::display_logo(&mut gfx);
 
     loop {}
 }

agb/gfx/agb_logo.toml

@@ -0,0 +1,9 @@
+version = "1.0"
+
+# Only needed for within the agb crate
+crate_prefix = "crate"
+
+[image.test_logo]
+filename = "test_logo.png"
+transparent_colour = "010101"
+tile_size = "8x8"

agb/src/display/example_logo.rs

@@ -1,22 +1,28 @@
-include!(concat!(env!("OUT_DIR"), "/test_logo.rs"));
+use crate::display::tiled0::Tiled0;
 
-#[test_case]
-fn logo_display(gba: &mut crate::Gba) {
-    let mut gfx = gba.display.video.tiled0();
+crate::include_gfx!("gfx/agb_logo.toml");
 
-    gfx.set_background_palettes(PALETTE_DATA);
-    gfx.set_background_tilemap(0, TILE_DATA);
+pub fn display_logo(gfx: &mut Tiled0) {
+    gfx.set_background_palettes(agb_logo::test_logo.palettes);
+    gfx.set_background_tilemap(0, agb_logo::test_logo.tiles);
 
     let mut back = gfx.get_background().unwrap();
 
     let mut entries: [u16; 30 * 20] = [0; 30 * 20];
     for tile_id in 0..(30 * 20) {
-        let palette_entry = PALETTE_ASSIGNMENT[tile_id as usize] as u16;
+        let palette_entry = agb_logo::test_logo.palette_assignments[tile_id as usize] as u16;
         entries[tile_id as usize] = tile_id | (palette_entry << 12);
     }
 
     back.draw_full_map(&entries, (30_u32, 20_u32).into(), 0);
     back.show();
+}
+
+#[test_case]
+fn logo_display(gba: &mut crate::Gba) {
+    let mut gfx = gba.display.video.tiled0();
+
+    display_logo(&mut gfx);
 
     crate::assert_image_output("gfx/test_logo.png");
 }

agb/src/display/mod.rs

@@ -16,6 +16,8 @@ pub mod example_logo;
 pub mod object;
 /// Palette type.
 pub mod palette16;
+/// Data produced by agb-image-converter
+pub mod tile_data;
 /// Graphics mode 0. Four regular backgrounds.
 pub mod tiled0;
 /// Syscall for waiting for vblank.

agb/src/display/tile_data.rs

@@ -0,0 +1,21 @@
+use crate::display::palette16::Palette16;
+
+pub struct TileData {
+    pub palettes: &'static [Palette16],
+    pub tiles: &'static [u32],
+    pub palette_assignments: &'static [u8],
+}
+
+impl TileData {
+    pub const fn new(
+        palettes: &'static [Palette16],
+        tiles: &'static [u32],
+        palette_assignments: &'static [u8],
+    ) -> Self {
+        TileData {
+            palettes,
+            tiles,
+            palette_assignments,
+        }
+    }
+}

agb/src/lib.rs

@@ -20,6 +20,8 @@ pub mod input;
 /// Implements sound output.
 pub mod sound;
 
+pub use agb_image_converter::include_gfx;
+
 mod bitarray;
 mod interrupt;
 mod memory_mapped;