mirror of
https://github.com/italicsjenga/agb.git
synced 2024-12-23 08:11:33 +11:00
somewhat mad left align renderer
This commit is contained in:
Corwin
parent
b75303863d
commit
ce7bcacb3c
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@ -8,11 +8,12 @@ use agb::{
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PaletteVram, Size,
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},
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palette16::Palette16,
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Font,
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Font, WIDTH,
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},
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include_font,
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input::Button,
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};
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use agb_fixnum::Rect;
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use core::fmt::Write;
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@ -31,12 +32,12 @@ fn main(mut gba: agb::Gba) -> ! {
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let palette = Palette16::new(palette);
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let palette = PaletteVram::new(&palette).unwrap();
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let config = Configuration::new(Size::S32x16, palette);
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let config = Configuration::new(Size::S16x16, palette);
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let mut wr = BufferedWordRender::new(&FONT, config);
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let _ = writeln!(
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wr,
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"Hello there!\nI spent this weekend\nwriting this text system!\nIs it any good?\n\nOh, by the way, you can\npress A to restart!"
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"Hello there!\nI spent this weekend writing this text system! Is it any good?\n\nOh, by the way, you can press A to restart!"
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);
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let vblank = agb::interrupt::VBlank::get();
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@ -46,7 +47,7 @@ fn main(mut gba: agb::Gba) -> ! {
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let mut timer: agb::timer::Timer = timer.timer2;
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timer.set_enabled(true);
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timer.set_divider(agb::timer::Divider::Divider64);
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timer.set_divider(agb::timer::Divider::Divider256);
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let mut num_letters = 0;
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let mut frame = 0;
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@ -54,20 +55,21 @@ fn main(mut gba: agb::Gba) -> ! {
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loop {
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vblank.wait_for_vblank();
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input.update();
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let oam_frmae = &mut unmanaged.iter();
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let oam = &mut unmanaged.iter();
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wr.commit(oam);
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let start = timer.value();
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wr.draw_partial(oam_frmae, (0, 0).into(), num_letters);
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wr.update(Rect::new((0, 0).into(), (WIDTH, 100).into()), num_letters);
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wr.process();
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let end = timer.value();
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agb::println!("Took {} cycles", 64 * (end.wrapping_sub(start) as u32));
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agb::println!("Took {} cycles", 256 * (end.wrapping_sub(start) as u32));
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frame += 1;
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if frame % 4 == 0 {
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num_letters += 1;
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}
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wr.process();
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if input.is_just_pressed(Button::A) {
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break;
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@ -1,6 +1,6 @@
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use core::fmt::Write;
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use core::{cell::Cell, fmt::Write, num::NonZeroUsize};
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use agb_fixnum::Vector2D;
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use agb_fixnum::{Rect, Vector2D};
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use alloc::{collections::VecDeque, vec::Vec};
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use crate::display::{object::ObjectUnmanaged, Font};
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@ -19,81 +19,208 @@ enum WhiteSpace {
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NewLine,
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}
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enum TextElement {
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LetterGroup(LetterGroup),
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enum TextElementReference<'text> {
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Word(Word<'text>),
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WhiteSpace(WhiteSpace),
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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struct Word<'letters> {
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letters: &'letters [LetterGroup],
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width: Cell<Option<NonZeroUsize>>,
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}
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#[test_case]
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fn check_size_of_text_element_is_expected(_: &mut crate::Gba) {
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assert_eq!(
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core::mem::size_of::<TextElement>(),
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core::mem::size_of::<LetterGroup>()
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);
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impl<'letters> Word<'letters> {
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fn new(letters: &'letters [LetterGroup]) -> Self {
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Self {
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letters,
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width: Cell::new(None),
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}
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}
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}
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pub struct TextBlock {
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elements: Vec<TextElement>,
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cache: CachedRender,
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impl Word<'_> {
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fn width(&self) -> usize {
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match self.width.get() {
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Some(width) => width.get(),
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None => {
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let width = self.letters.iter().fold(0, |acc, letter| {
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acc + (letter.width as i32 + letter.left as i32)
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});
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let width = width as usize;
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self.width.set(NonZeroUsize::new(width));
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width
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}
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}
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}
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}
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pub struct CachedRender {
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#[derive(Clone, Copy)]
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struct WordLength(u8);
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#[derive(Clone, Copy)]
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enum Element {
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Word(u8),
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NewLine,
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Space,
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}
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const NEW_LINE: u8 = 0xFF;
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const SPACE: u8 = 0xFE;
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impl WordLength {
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fn parse(self) -> Element {
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if self.0 == NEW_LINE {
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Element::NewLine
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} else if self.0 == SPACE {
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Element::Space
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} else {
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Element::Word(self.0)
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}
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}
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fn from_element(e: Element) -> Self {
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WordLength(match e {
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Element::Word(len) => len,
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Element::NewLine => NEW_LINE,
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Element::Space => SPACE,
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})
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}
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}
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struct Letters(Vec<LetterGroup>);
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struct Words {
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letters: Letters,
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word_lengths: Vec<WordLength>,
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}
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struct WordRenderCache {
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objects: Vec<ObjectUnmanaged>,
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up_to: usize,
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head_position: Vector2D<i32>,
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origin: Vector2D<i32>,
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state: WordRenderCacheState,
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poison_condition: WordRenderPoisonCondition,
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}
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impl TextBlock {
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fn reset_cache(&mut self, position: Vector2D<i32>) {
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self.cache.objects.clear();
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self.cache.up_to = 0;
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self.cache.head_position = position;
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self.cache.origin = position;
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}
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struct WordRenderPoisonCondition {
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area: Rect<i32>,
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}
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fn generate_cache(&mut self, up_to: usize) {
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let mut head_position = self.cache.head_position;
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struct WordRenderCacheState {
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depth_in_word_iterator: usize,
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depth_in_word: usize,
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depth_in_elements: usize,
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head_position: Vector2D<i32>,
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}
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for element in self.elements.iter().take(up_to).skip(self.cache.up_to) {
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match element {
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TextElement::LetterGroup(group) => {
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let mut object = ObjectUnmanaged::new(group.sprite.clone());
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object.show();
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head_position.x += group.left as i32;
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object.set_position(head_position);
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head_position.x += group.width as i32;
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self.cache.objects.push(object);
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}
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TextElement::WhiteSpace(white) => match white {
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WhiteSpace::Space => head_position.x += 10,
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WhiteSpace::NewLine => {
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head_position.x = self.cache.origin.x;
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head_position.y += 15;
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}
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impl WordRenderCache {
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fn new() -> Self {
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WordRenderCache {
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objects: Vec::new(),
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state: WordRenderCacheState {
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depth_in_word_iterator: 0,
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depth_in_word: 0,
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depth_in_elements: 0,
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head_position: (0, 0).into(),
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},
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poison_condition: WordRenderPoisonCondition {
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area: Rect::new((0, 0).into(), (0, 0).into()),
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},
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}
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}
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self.cache.head_position = head_position;
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self.cache.up_to = up_to.min(self.elements.len());
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fn reset_state(&mut self, position: Rect<i32>) {
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self.state = WordRenderCacheState {
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depth_in_elements: 0,
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depth_in_word: 0,
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depth_in_word_iterator: 0,
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head_position: position.position,
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};
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self.poison_condition = WordRenderPoisonCondition { area: position };
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}
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fn draw(&mut self, oam: &mut OamIterator, position: Vector2D<i32>, up_to: usize) {
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if position != self.cache.origin {
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self.reset_cache(position);
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fn generate_cache(&mut self, words: &Words, desired_element_count: usize) {
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let position = self.poison_condition.area;
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if self.state.depth_in_elements >= desired_element_count {
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return;
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}
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self.generate_cache(up_to);
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'outer: for elem in words.iter_words().skip(self.state.depth_in_word_iterator) {
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match elem {
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TextElementReference::Word(word) => {
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let prospective_x = self.state.head_position.x + word.width() as i32;
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for (obj, slot) in self.cache.objects.iter().zip(oam) {
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slot.set(obj);
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if self.state.depth_in_word == 0
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&& prospective_x > position.position.x + position.size.x
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{
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self.state.head_position.x = position.position.x;
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self.state.head_position.y += 15;
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}
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for letter in word.letters.iter().skip(self.state.depth_in_word) {
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self.state.head_position.x += letter.left as i32;
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let mut object = ObjectUnmanaged::new(letter.sprite.clone());
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object.show();
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object.set_position(self.state.head_position);
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self.objects.push(object);
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self.state.head_position.x += letter.width as i32;
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self.state.depth_in_elements += 1;
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self.state.depth_in_word += 1;
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if self.state.depth_in_elements >= desired_element_count {
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break 'outer;
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}
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}
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self.state.depth_in_word = 0;
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}
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TextElementReference::WhiteSpace(space) => {
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match space {
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WhiteSpace::Space => self.state.head_position.x += 10,
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WhiteSpace::NewLine => {
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self.state.head_position.x = position.position.x;
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self.state.head_position.y += 15;
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}
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}
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self.state.depth_in_elements += 1;
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}
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}
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self.state.depth_in_word_iterator += 1;
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if self.state.depth_in_elements >= desired_element_count {
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break 'outer;
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}
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}
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}
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fn update(&mut self, words: &Words, desired_element_count: usize, position: Rect<i32>) {
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if self.poison_condition.area != position {
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self.reset_state(position);
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}
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self.generate_cache(words, desired_element_count);
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}
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fn commit(&self, oam: &mut OamIterator) {
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for (object, slot) in self.objects.iter().zip(oam) {
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slot.set(object);
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}
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}
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}
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impl Words {
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fn iter_words(&self) -> impl Iterator<Item = TextElementReference> {
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let mut letters_idx: usize = 0;
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self.word_lengths.iter().map(move |x| match x.parse() {
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Element::Word(length) => {
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let idx = letters_idx;
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let end_idx = idx + length as usize;
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letters_idx = end_idx;
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TextElementReference::Word(Word::new(&self.letters.0[idx..end_idx]))
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}
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Element::NewLine => TextElementReference::WhiteSpace(WhiteSpace::NewLine),
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Element::Space => TextElementReference::WhiteSpace(WhiteSpace::Space),
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})
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}
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}
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@ -138,8 +265,11 @@ impl Configuration {
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pub struct BufferedWordRender<'font> {
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word_render: WordRender<'font>,
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block: TextBlock,
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block: Words,
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current_word_length: usize,
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number_of_elements: usize,
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buffered_chars: VecDeque<char>,
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cache: WordRenderCache,
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}
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impl Write for BufferedWordRender<'_> {
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@ -157,16 +287,14 @@ impl<'font> BufferedWordRender<'font> {
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pub fn new(font: &'font Font, config: Configuration) -> Self {
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BufferedWordRender {
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word_render: WordRender::new(font, config),
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block: TextBlock {
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elements: Vec::new(),
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cache: CachedRender {
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objects: Vec::new(),
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up_to: 0,
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head_position: (0, 0).into(),
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origin: (0, 0).into(),
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},
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block: Words {
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letters: Letters(Vec::new()),
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word_lengths: Vec::new(),
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},
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current_word_length: 0,
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number_of_elements: 0,
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buffered_chars: VecDeque::new(),
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cache: WordRenderCache::new(),
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}
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}
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}
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@ -176,43 +304,51 @@ impl BufferedWordRender<'_> {
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if let Some(char) = self.buffered_chars.pop_front() {
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if char == '\n' {
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if let Some(group) = self.word_render.finalise_letter() {
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self.block.elements.push(TextElement::LetterGroup(group));
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self.block.letters.0.push(group);
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self.current_word_length += 1;
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}
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self.block
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.elements
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.push(TextElement::WhiteSpace(WhiteSpace::NewLine));
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.word_lengths
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.push(WordLength::from_element(Element::Word(
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self.current_word_length as u8,
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)));
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self.block
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.word_lengths
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.push(WordLength::from_element(Element::NewLine));
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self.number_of_elements += self.current_word_length + 1;
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self.current_word_length = 0;
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} else if char == ' ' {
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if let Some(group) = self.word_render.finalise_letter() {
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self.block.elements.push(TextElement::LetterGroup(group));
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self.block.letters.0.push(group);
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self.current_word_length += 1;
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}
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self.block
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.elements
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.push(TextElement::WhiteSpace(WhiteSpace::Space));
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.word_lengths
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.push(WordLength::from_element(Element::Word(
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self.current_word_length as u8,
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)));
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self.block
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.word_lengths
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.push(WordLength::from_element(Element::Space));
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self.number_of_elements += self.current_word_length + 1;
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self.current_word_length = 0;
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} else if let Some(group) = self.word_render.render_char(char) {
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self.block.elements.push(TextElement::LetterGroup(group));
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self.block.letters.0.push(group);
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self.current_word_length += 1;
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}
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}
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}
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pub fn draw_partial(
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&mut self,
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oam: &mut OamIterator,
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position: Vector2D<i32>,
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num_groups: usize,
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) {
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while self.block.elements.len() < num_groups && !self.buffered_chars.is_empty() {
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pub fn update(&mut self, position: Rect<i32>, number_of_elements: usize) {
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while !self.buffered_chars.is_empty() && self.number_of_elements < number_of_elements {
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self.process();
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}
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self.block.draw(oam, position, num_groups);
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self.cache.update(&self.block, number_of_elements, position);
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}
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pub fn draw(&mut self, oam: &mut OamIterator, position: Vector2D<i32>) {
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while !self.buffered_chars.is_empty() {
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self.process();
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}
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self.block.draw(oam, position, usize::MAX);
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pub fn commit(&self, oam: &mut OamIterator) {
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self.cache.commit(oam);
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}
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}
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