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Bitmap4 fix (#487)

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Expands on #486 by updating example and updating changelog.

- [x] Changelog updated
This commit is contained in:
Corwin 2023-09-28 21:35:21 +01:00 committed by GitHub
parent 3539bf2fdc e2bff6dfff
commit fc721ea060
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3 changed files with 18 additions and 18 deletions
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3
CHANGELOG.md
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@ -96,6 +96,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
- Zero volume now plays no sound.
- Fixed issue where volume was incorrect for volumes which were powers of 2.
### Fixed
- Fixed a bug in bitmap4 that caused setting pixels to be always incorrect.
## [0.12.2] - 2022/10/22
This is a minor release to fix an alignment issue with background tiles.

29
agb/examples/bitmap4.rs
View file

@ -1,7 +1,7 @@
#![no_std]
#![no_main]
use agb::display;
use agb::display::{self, HEIGHT, WIDTH};
#[agb::entry]
fn main(mut gba: agb::Gba) -> ! {
@ -11,25 +11,22 @@ fn main(mut gba: agb::Gba) -> ! {
bitmap.set_palette_entry(1, 0x001F);
bitmap.set_palette_entry(2, 0x03E0);
bitmap.draw_point_page(
display::WIDTH / 2,
display::HEIGHT / 2,
1,
display::bitmap4::Page::Front,
);
bitmap.draw_point_page(
display::WIDTH / 2 + 5,
display::HEIGHT / 2,
2,
display::bitmap4::Page::Back,
);
for y in 0..HEIGHT {
for x in 0..WIDTH {
bitmap.draw_point_page(x, y, 0xF, display::bitmap4::Page::Front);
bitmap.draw_point_page(x, y, 1, display::bitmap4::Page::Front);
bitmap.draw_point_page(x, y, 0xFF, display::bitmap4::Page::Back);
bitmap.draw_point_page(x, y, 2, display::bitmap4::Page::Back);
}
}
let mut count = 0;
let mut input = agb::input::ButtonController::new();
loop {
vblank.wait_for_vblank();
count += 1;
if count % 6 == 0 {
input.update();
if input.is_just_pressed(agb::input::Button::A) {
bitmap.flip_page();
}
}

4
agb/src/display/bitmap4.rs
View file

@ -54,9 +54,9 @@ impl Bitmap4<'_> {
let c = addr.get(x_in_screen, y_in_screen);
if x & 0b1 != 0 {
addr.set(x_in_screen, y_in_screen, c | u16::from(colour) << 8);
addr.set(x_in_screen, y_in_screen, c & 0xff | u16::from(colour) << 8);
} else {
addr.set(x_in_screen, y_in_screen, c | u16::from(colour));
addr.set(x_in_screen, y_in_screen, c & 0xff00 | u16::from(colour));
}
}