mirror of
https://github.com/italicsjenga/gba.git
synced 2024-12-24 11:11:31 +11:00
94 lines
2.3 KiB
Rust
94 lines
2.3 KiB
Rust
#![no_std]
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#![no_main]
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use core::{fmt::Write, mem::size_of_val};
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use gba::{
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mgba::{MgbaBufferedLogger, MgbaMessageLevel},
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prelude::*,
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};
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#[panic_handler]
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fn panic_handler(info: &core::panic::PanicInfo) -> ! {
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if let Ok(mut logger) = MgbaBufferedLogger::try_new(MgbaMessageLevel::Fatal) {
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write!(logger, "{info}").ok();
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}
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loop {}
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}
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static FRAME_KEYS: GbaCell<KeyInput> = GbaCell::new(KeyInput::new());
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extern "C" fn irq_handler(_: IrqBits) {
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// We'll read the keys during vblank and store it for later.
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FRAME_KEYS.write(KEYINPUT.read());
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}
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#[no_mangle]
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extern "C" fn main() -> ! {
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RUST_IRQ_HANDLER.write(Some(irq_handler));
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DISPSTAT.write(DisplayStatus::new().with_irq_vblank(true));
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IE.write(IrqBits::VBLANK);
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IME.write(true);
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if let Ok(mut logger) = MgbaBufferedLogger::try_new(MgbaMessageLevel::Debug) {
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writeln!(logger, "hello!").ok();
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}
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{
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// get our tile data into memory.
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let src = CGA_8X8_THICK.as_ptr().cast::<u8>();
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let dest = CHARBLOCK0_4BPP.index(0).as_usize() as *mut u32;
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let info = BitUnpackInfo {
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src_byte_len: size_of_val(&CGA_8X8_THICK) as u16,
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src_elem_width: 1,
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dest_elem_width: 4,
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offset_and_touch_zero: 0,
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};
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unsafe { BitUnPack(src, dest, &info) };
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}
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{
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// the the tilemap set up
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let tsb = TextScreenblock::new(31);
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for row in 0..16_usize {
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for col in 0..16_usize {
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let id = row * 16 + col;
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let entry = TextEntry::new().with_tile_id(id as u16);
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tsb.row_col(row, col).write(entry);
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}
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}
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}
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{
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// Set BG0 to use the tilemap we just made, and set it to be shown.
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BG0CNT.write(BackgroundControl::new().with_screenblock(31));
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DISPCNT.write(DisplayControl::new().with_show_bg0(true));
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}
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let mut x_off = 0_u32;
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let mut y_off = 0_u32;
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let mut backdrop_color = Color(0);
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loop {
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VBlankIntrWait();
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// show current frame
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BACKDROP_COLOR.write(backdrop_color);
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BG0HOFS.write(x_off as u16);
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BG0VOFS.write(y_off as u16);
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// prep next frame
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let k = FRAME_KEYS.read();
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backdrop_color = Color(k.to_u16());
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if k.up() {
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y_off = y_off.wrapping_add(1);
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}
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if k.down() {
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y_off = y_off.wrapping_sub(1);
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}
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if k.left() {
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x_off = x_off.wrapping_add(1);
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}
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if k.right() {
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x_off = x_off.wrapping_sub(1);
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}
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}
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}
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