mirror of
https://github.com/italicsjenga/gba.git
synced 2024-12-24 03:11:29 +11:00
fd3a308e8a
* . * more updates, much more to do soon. * hello world works again. * fix key interrupts. * remove the old book * don't forget timers. * we can just use search, duh. * cleanup * more bios * finished most mmio, finished bios. * dump some old macros that shouldn't have been pub to begin with. * Update README.md * for now, just make this a u16 * timers * fix hello_world * timer fix * docs on timers * block resetting work ram for now. * put preserves_flags on bios calls as appropriate * add a code page 437 tile sheet. * docs. * sound :( it's all bad but we'll fix it in 0.5 * move most backup files back into the lib. * CI might work now? * fix up non-serial examples. * oops, gotta check out the repo. * readme.
80 lines
2.1 KiB
Rust
80 lines
2.1 KiB
Rust
#![no_std]
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#![no_main]
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use gba::prelude::*;
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#[panic_handler]
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#[allow(unused)]
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fn panic(info: &core::panic::PanicInfo) -> ! {
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// This kills the emulation with a message if we're running inside an
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// emulator we support (mGBA or NO$GBA), or just crashes the game if we
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// aren't.
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//fatal!("{}", info);
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loop {
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DISPCNT.read();
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}
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}
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/// Performs a busy loop until VBlank starts.
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///
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/// This is very inefficient, and please keep following the lessons until we
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/// cover how interrupts work!
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pub fn spin_until_vblank() {
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while VCOUNT.read() < 160 {}
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}
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/// Performs a busy loop until VDraw starts.
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///
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/// This is very inefficient, and please keep following the lessons until we
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/// cover how interrupts work!
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pub fn spin_until_vdraw() {
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while VCOUNT.read() >= 160 {}
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}
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#[no_mangle]
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pub fn main() -> ! {
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const SETTING: DisplayControl = DisplayControl::new().with_display_mode(3).with_display_bg2(true);
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DISPCNT.write(SETTING);
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let mut px = mode3::WIDTH / 2;
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let mut py = mode3::HEIGHT / 2;
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let mut color = Color::from_rgb(31, 3, 1);
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loop {
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// read our keys for this frame
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let keys: Keys = KEYINPUT.read().into();
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// adjust game state and wait for vblank
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px = px.wrapping_add((2 * keys.x_signum()) as usize);
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py = py.wrapping_add((2 * keys.y_signum()) as usize);
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if keys.l() {
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color = Color(color.0.rotate_left(5));
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}
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if keys.r() {
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color = Color(color.0.rotate_right(5));
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}
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// now we wait
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spin_until_vblank();
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// draw the new game and wait until the next frame starts.
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if (px + 1) >= mode3::WIDTH || (py + 1) >= mode3::HEIGHT {
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// out of bounds, reset the screen and position.
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mode3::dma3_clear_to(Color::from_rgb(0, 0, 0));
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px = mode3::WIDTH / 2;
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py = mode3::HEIGHT / 2;
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color = Color(color.0.rotate_left(7));
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} else {
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// draw the new part of the line
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mode3::bitmap_xy(px, py).write(color);
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mode3::bitmap_xy(px, py + 1).write(color);
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mode3::bitmap_xy(px + 1, py).write(color);
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mode3::bitmap_xy(px + 1, py + 1).write(color);
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}
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// now we wait again
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spin_until_vdraw();
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}
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}
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