Add a no game (#427)

This adds a "no game" to replace the template.
* Inspired by how Love2D has a default game that says "No Game".
* This screen:
https://youtube.com/clip/Ugkx6atqwerxyyUSiVrFhmAh7pK2xNgjHxI9

- [x] Changelog updated

CHANGELOG.md

@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+- Changed the default template game
+
 ## [0.15.0] - 2023/04/25
 
 ### Added

agb-image-converter/src/lib.rs

@@ -239,9 +239,36 @@ impl ToTokens for ByteString<'_> {
     }
 }
 
+#[proc_macro]
+pub fn include_colours_inner(input: TokenStream) -> TokenStream {
+    let input_filename = parse_macro_input!(input as LitStr);
+    let input_filename = input_filename.value();
+
+    let root = std::env::var("CARGO_MANIFEST_DIR").expect("Failed to get cargo manifest dir");
+    let input_filename = Path::new(&root).join(input_filename);
+
+    let image = Image::load_from_file(Path::new(&input_filename));
+
+    let mut palette_data = Vec::with_capacity(image.width * image.height);
+    for y in 0..image.height {
+        for x in 0..image.width {
+            palette_data.push(image.colour(x, y).to_rgb15())
+        }
+    }
+
+    let filename = input_filename.to_string_lossy();
+
+    TokenStream::from(quote! {
+        {
+            const _: &[u8] = include_bytes!(#filename);
+            [#(#palette_data),*]
+        }
+    })
+}
+
 #[proc_macro]
 pub fn include_aseprite_inner(input: TokenStream) -> TokenStream {
-    let parser = Punctuated::<LitStr, syn::Token![,]>::parse_separated_nonempty;
+    let parser = Punctuated::<LitStr, syn::Token![,]>::parse_terminated;
     let parsed = match parser.parse(input) {
         Ok(e) => e,
         Err(e) => return e.to_compile_error().into(),
@@ -432,8 +459,8 @@ fn palette_tile_data(
 
     let mut tile_data = Vec::new();
 
-    for image in images {
-        add_image_to_tile_data(&mut tile_data, image, optimiser, 0)
+    for (image_idx, image) in images.iter().enumerate() {
+        add_image_to_tile_data(&mut tile_data, image, optimiser, image_idx)
     }
 
     let tile_data = collapse_to_4bpp(&tile_data);

agb-image-converter/src/palette16.rs

@@ -138,17 +138,7 @@ impl Palette16Optimiser {
         while !unsatisfied_palettes.is_empty() {
             let palette = self.find_maximal_palette_for(&unsatisfied_palettes);
 
-            for test_palette in unsatisfied_palettes.clone() {
-                if test_palette.is_satisfied_by(&palette) {
-                    unsatisfied_palettes.remove(&test_palette);
-                }
-            }
-
-            for (i, overall_palette) in self.palettes.iter().enumerate() {
-                if overall_palette.is_satisfied_by(&palette) {
-                    assignments[i] = optimised_palettes.len();
-                }
-            }
+            unsatisfied_palettes.retain(|test_palette| !test_palette.is_satisfied_by(&palette));
 
             optimised_palettes.push(palette);
 
@@ -157,6 +147,13 @@ impl Palette16Optimiser {
             }
         }
 
+        for (i, overall_palette) in self.palettes.iter().enumerate() {
+            assignments[i] = optimised_palettes
+                .iter()
+                .position(|palette| overall_palette.is_satisfied_by(palette))
+                .unwrap();
+        }
+
         Palette16OptimisationResults {
             optimised_palettes,
             assignments,

agb/examples/no_game.rs

@@ -0,0 +1,7 @@
+#![no_std]
+#![no_main]
+
+#[agb::entry]
+fn main(gba: agb::Gba) -> ! {
+    agb::no_game(gba);
+}

agb/src/display/object/sprites/sprite.rs

@@ -94,6 +94,7 @@ macro_rules! align_bytes {
 #[macro_export]
 macro_rules! include_aseprite {
     ($($aseprite_path: expr),*) => {{
+        #[allow(unused_imports)]
         use $crate::display::object::{Size, Sprite, Tag, TagMap, Graphics};
         use $crate::display::palette16::Palette16;
         use $crate::align_bytes;
@@ -367,4 +368,11 @@ impl Size {
             Size::S32x64 => (32, 64),
         }
     }
+
+    #[must_use]
+    /// Returns the width and height of the size in pixels.
+    pub const fn to_tiles_width_height(self) -> (usize, usize) {
+        let wh = self.to_width_height();
+        (wh.0 / 8, wh.1 / 8)
+    }
 }

agb/src/display/object/sprites/sprite_allocator.rs

@@ -1,6 +1,11 @@
-use core::ptr::NonNull;
+use core::{alloc::Allocator, ptr::NonNull};
 
-use alloc::rc::{Rc, Weak};
+use alloc::{
+    alloc::Global,
+    boxed::Box,
+    rc::{Rc, Weak},
+    vec::Vec,
+};
 
 use crate::{
     agb_alloc::{block_allocator::BlockAllocator, bump_allocator::StartEnd},
@@ -285,34 +290,61 @@ impl Default for SpriteLoader {
 }
 
 /// Sprite data that can be used to create sprites in vram.
-pub struct DynamicSprite<'a> {
-    data: &'a [u8],
+pub struct DynamicSprite<A: Allocator = Global> {
+    data: Box<[u8], A>,
     size: Size,
 }
 
-impl DynamicSprite<'_> {
+impl DynamicSprite {
     #[must_use]
-    /// Creates a new dynamic sprite from underlying bytes. Note that despite
-    /// being an array of u8, this must be aligned to at least a 2 byte
-    /// boundary.
-    pub fn new(data: &[u8], size: Size) -> DynamicSprite {
-        let ptr = &data[0] as *const _ as usize;
-        if ptr % 2 != 0 {
-            panic!("data is not aligned to a 2 byte boundary");
-        }
-        if data.len() != size.number_of_tiles() * BYTES_PER_TILE_4BPP {
-            panic!(
-                "data is not of expected length, got {} expected {}",
-                data.len(),
-                size.number_of_tiles() * BYTES_PER_TILE_4BPP
-            );
-        }
+    /// Creates a new dynamic sprite.
+    pub fn new(size: Size) -> Self {
+        Self::new_in(size, Global)
+    }
+}
+
+impl<A: Allocator> DynamicSprite<A> {
+    #[must_use]
+    /// Creates a new dynamic sprite of a given size in a given allocator.
+    pub fn new_in(size: Size, allocator: A) -> Self {
+        let num_bytes = size.number_of_tiles() * BYTES_PER_TILE_4BPP;
+        let mut data = Vec::with_capacity_in(num_bytes, allocator);
+
+        data.resize(num_bytes, 0);
+
+        let data = data.into_boxed_slice();
+
         DynamicSprite { data, size }
     }
 
+    /// Set the pixel of a sprite to a given paletted pixel. Panics if the
+    /// coordinate is out of range of the sprite or if the paletted pixel is
+    /// greater than 4 bits.
+    pub fn set_pixel(&mut self, x: usize, y: usize, paletted_pixel: usize) {
+        assert!(paletted_pixel < 0x10);
+
+        let (sprite_pixel_x, sprite_pixel_y) = self.size.to_width_height();
+        assert!(x < sprite_pixel_x, "x too big for sprite size");
+        assert!(y < sprite_pixel_y, "y too big for sprite size");
+
+        let (sprite_tile_x, _) = self.size.to_tiles_width_height();
+
+        let (adjust_tile_x, adjust_tile_y) = (x / 8, y / 8);
+
+        let tile_number_to_modify = adjust_tile_x + adjust_tile_y * sprite_tile_x;
+
+        let byte_to_modify_in_tile = x / 2 + y * 4;
+        let byte_to_modify = tile_number_to_modify * BYTES_PER_TILE_4BPP + byte_to_modify_in_tile;
+        let mut byte = self.data[byte_to_modify];
+        let parity = (x & 0b1) * 4;
+
+        byte = (byte & !(0b1111 << parity)) | ((paletted_pixel as u8) << parity);
+        self.data[byte_to_modify] = byte;
+    }
+
     /// Tries to copy the sprite to vram to be used to set object sprites.
     pub fn try_vram(&self, palette: PaletteVram) -> Result<SpriteVram, LoaderError> {
-        SpriteVram::new(self.data, self.size, palette)
+        SpriteVram::new(&self.data, self.size, palette)
     }
 
     #[must_use]

agb/src/display/palette16.rs

@@ -27,3 +27,12 @@ impl Palette16 {
         Layout::new::<Self>()
     }
 }
+
+#[macro_export]
+macro_rules! include_palette {
+    ($palette:literal) => {
+        $crate::include_colours_inner!($palette)
+    };
+}
+
+pub use include_palette;

agb/src/lib.rs

@@ -104,6 +104,9 @@ pub use agb_image_converter::include_aseprite_inner;
 #[doc(hidden)]
 pub use agb_image_converter::include_font as include_font_inner;
 
+#[doc(hidden)]
+pub use agb_image_converter::include_colours_inner;
+
 #[macro_export]
 macro_rules! include_font {
     ($font_path: literal, $font_size: literal) => {{
@@ -165,6 +168,11 @@ pub mod syscall;
 /// Interactions with the internal timers
 pub mod timer;
 
+mod no_game;
+
+/// Default game
+pub use no_game::no_game;
+
 pub(crate) mod arena;
 
 pub use {agb_alloc::ExternalAllocator, agb_alloc::InternalAllocator};

agb/src/no_game.rs

@@ -0,0 +1,213 @@
+//! The no game screen is what is displayed if there isn't a game made yet.
+
+use agb_fixnum::{num, Num, Vector2D};
+use alloc::vec::Vec;
+use alloc::{boxed::Box, vec};
+
+use crate::display::object::{DynamicSprite, PaletteVram, Size, SpriteVram};
+use crate::display::palette16::Palette16;
+use crate::{
+    display::{object::ObjectUnmanaged, HEIGHT, WIDTH},
+    include_palette,
+    interrupt::VBlank,
+};
+
+const PALETTE: &[u16] = &include_palette!("gfx/pastel.png");
+
+fn letters() -> Vec<Vec<Vector2D<Num<i32, 8>>>> {
+    vec![
+        // N
+        vec![
+            (num!(0.), num!(0.)).into(),
+            (num!(1.), num!(1.)).into(),
+            (num!(2.), num!(2.)).into(),
+            (num!(3.), num!(3.)).into(),
+            (num!(0.), num!(1.)).into(),
+            (num!(0.), num!(2.)).into(),
+            (num!(0.), num!(3.)).into(),
+            (num!(3.), num!(0.)).into(),
+            (num!(3.), num!(1.)).into(),
+            (num!(3.), num!(2.)).into(),
+            (num!(3.), num!(3.)).into(),
+        ],
+        // O
+        vec![
+            (num!(0.), num!(0.)).into(),
+            (num!(0.), num!(1.)).into(),
+            (num!(0.), num!(2.)).into(),
+            (num!(0.), num!(3.)).into(),
+            (num!(1.), num!(3.)).into(),
+            (num!(2.), num!(3.)).into(),
+            (num!(3.), num!(3.)).into(),
+            (num!(3.), num!(2.)).into(),
+            (num!(3.), num!(1.)).into(),
+            (num!(3.), num!(0.)).into(),
+            (num!(2.), num!(0.)).into(),
+            (num!(1.), num!(0.)).into(),
+        ],
+        // G
+        vec![
+            (num!(3.), num!(0.)).into(),
+            (num!(2.), num!(0.)).into(),
+            (num!(1.), num!(0.)).into(),
+            (num!(0.), num!(0.)).into(),
+            (num!(0.), num!(1.)).into(),
+            (num!(0.), num!(2.)).into(),
+            (num!(0.), num!(3.)).into(),
+            (num!(1.), num!(3.)).into(),
+            (num!(2.), num!(3.)).into(),
+            (num!(3.), num!(3.)).into(),
+            (num!(3.), num!(2.25)).into(),
+            (num!(3.), num!(1.5)).into(),
+            (num!(2.), num!(1.5)).into(),
+        ],
+        // A
+        vec![
+            (num!(0.), num!(0.)).into(),
+            (num!(0.), num!(1.)).into(),
+            (num!(0.), num!(2.)).into(),
+            (num!(0.), num!(3.)).into(),
+            (num!(3.), num!(3.)).into(),
+            (num!(3.), num!(2.)).into(),
+            (num!(3.), num!(1.)).into(),
+            (num!(3.), num!(0.)).into(),
+            (num!(2.), num!(0.)).into(),
+            (num!(1.), num!(0.)).into(),
+            (num!(1.), num!(1.5)).into(),
+            (num!(2.), num!(1.5)).into(),
+        ],
+        // M
+        vec![
+            (num!(0.), num!(0.)).into(),
+            (num!(0.), num!(1.)).into(),
+            (num!(0.), num!(2.)).into(),
+            (num!(0.), num!(3.)).into(),
+            (num!(3.), num!(3.)).into(),
+            (num!(3.), num!(2.)).into(),
+            (num!(3.), num!(1.)).into(),
+            (num!(3.), num!(0.)).into(),
+            (num!(1.5), num!(1.5)).into(),
+            (num!(0.75), num!(0.75)).into(),
+            (num!(2.25), num!(0.75)).into(),
+        ],
+        // E
+        vec![
+            (num!(0.), num!(0.)).into(),
+            (num!(0.), num!(1.)).into(),
+            (num!(0.), num!(2.)).into(),
+            (num!(0.), num!(3.)).into(),
+            (num!(1.), num!(3.)).into(),
+            (num!(2.), num!(3.)).into(),
+            (num!(3.), num!(3.)).into(),
+            (num!(3.), num!(0.)).into(),
+            (num!(2.), num!(0.)).into(),
+            (num!(1.), num!(0.)).into(),
+            (num!(1.), num!(1.5)).into(),
+            (num!(2.), num!(1.5)).into(),
+        ],
+    ]
+}
+
+fn generate_sprites() -> Box<[SpriteVram]> {
+    let mut sprites = Vec::new();
+
+    // generate palettes
+
+    let palettes: Vec<PaletteVram> = PALETTE
+        .chunks(15)
+        .map(|x| {
+            core::iter::once(0)
+                .chain(x.iter().copied())
+                .chain(core::iter::repeat(0))
+                .take(16)
+                .collect::<Vec<_>>()
+        })
+        .map(|palette| {
+            let palette = Palette16::new(palette.try_into().unwrap());
+            PaletteVram::new(&palette).unwrap()
+        })
+        .collect();
+
+    // generate sprites
+    let mut sprite = DynamicSprite::new(Size::S8x8);
+    for (palette, colour) in (0..PALETTE.len()).map(|x| (x / 15, x % 15)) {
+        for y in 0..8 {
+            for x in 0..8 {
+                sprite.set_pixel(x, y, colour + 1);
+            }
+        }
+        sprites.push(sprite.to_vram(palettes[palette].clone()));
+    }
+
+    sprites.into_boxed_slice()
+}
+
+pub fn no_game(mut gba: crate::Gba) -> ! {
+    let (mut oam, _) = gba.display.object.get_unmanaged();
+
+    let squares = generate_sprites();
+
+    let mut letter_positons = Vec::new();
+
+    let square_positions = {
+        let mut s = letters();
+        for letter in s.iter_mut() {
+            letter.sort_by_key(|a| a.magnitude_squared());
+        }
+        s
+    };
+    for (letter_idx, letter_parts) in square_positions.iter().enumerate() {
+        for part in letter_parts.iter() {
+            let position = part
+                .hadamard((8, 10).into())
+                .hadamard((num!(3.) / 2, num!(3.) / 2).into());
+
+            let letter_pos = Vector2D::new(
+                60 * (1 + letter_idx as i32 - ((letter_idx >= 2) as i32 * 3)),
+                70 * ((letter_idx >= 2) as i32),
+            );
+
+            letter_positons.push(position + letter_pos.change_base());
+        }
+    }
+
+    let bottom_right = letter_positons
+        .iter()
+        .copied()
+        .max_by_key(|x| x.manhattan_distance())
+        .unwrap();
+
+    let difference = (Vector2D::new(WIDTH - 8, HEIGHT - 8).change_base() - bottom_right) / 2;
+
+    for pos in letter_positons.iter_mut() {
+        *pos += difference;
+    }
+
+    let mut time: Num<i32, 8> = num!(0.);
+    let time_delta: Num<i32, 8> = num!(0.025);
+
+    let vblank = VBlank::get();
+
+    loop {
+        time += time_delta;
+        time %= 1;
+        let letters: Vec<ObjectUnmanaged> = letter_positons
+            .iter()
+            .enumerate()
+            .map(|(idx, position)| {
+                let time = time + Num::<i32, 8>::new(idx as i32) / 128;
+                (idx, *position + Vector2D::new(time.sin(), time.cos()) * 10)
+            })
+            .map(|(idx, pos)| {
+                let mut obj = ObjectUnmanaged::new(squares[idx % squares.len()].clone());
+                obj.show().set_position(pos.floor());
+                obj
+            })
+            .collect();
+
+        vblank.wait_for_vblank();
+        for (obj, slot) in letters.iter().zip(oam.iter()) {
+            slot.set(obj);
+        }
+    }
+}

template/src/main.rs

@@ -14,22 +14,10 @@
 #![cfg_attr(test, reexport_test_harness_main = "test_main")]
 #![cfg_attr(test, test_runner(agb::test_runner::test_runner))]
 
-use agb::{display, syscall};
-
 // The main function must take 1 arguments and never return. The agb::entry decorator
 // ensures that everything is in order. `agb` will call this after setting up the stack
 // and interrupt handlers correctly. It will also handle creating the `Gba` struct for you.
 #[agb::entry]
 fn main(mut gba: agb::Gba) -> ! {
-    let mut bitmap = gba.display.video.bitmap3();
-
-    for x in 0..display::WIDTH {
-        let y = syscall::sqrt(x << 6);
-        let y = (display::HEIGHT - y).clamp(0, display::HEIGHT - 1);
-        bitmap.draw_point(x, y, 0x001F);
-    }
-
-    loop {
-        syscall::halt();
-    }
+    agb::no_game(gba);
 }