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make the demo do a little more.

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Lokathor 2022-10-06 22:11:13 -06:00
parent 7ada0fa8e9
commit 64ab0f05f0
1 changed files with 37 additions and 12 deletions
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49
examples/hello.rs
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@ -15,16 +15,11 @@ fn panic_handler(info: &core::panic::PanicInfo) -> ! {
loop {} loop {}
} }
// GbaCell is non-freeze, so `.data` section, so this will default to IWRAM. static FRAME_KEYS: GbaCell<KeyInput> = GbaCell::new(KeyInput::new());
static KEYS: GbaCell<KeyInput> = GbaCell::new(KeyInput::new());
// We can also put things into EWRAM if we want to.
#[link_section = ".ewram"]
static VALUE: GbaCell<u16> = GbaCell::new(0);
extern "C" fn irq_handler(_: IrqBits) { extern "C" fn irq_handler(_: IrqBits) {
// just as a demo, we'll read the keys during vblank. // We'll read the keys during vblank and store it for later.
KEYS.write(KEYINPUT.read()); FRAME_KEYS.write(KEYINPUT.read());
} }
#[no_mangle] #[no_mangle]
@ -51,13 +46,43 @@ extern "C" fn main() -> ! {
unsafe { BitUnPack(CGA_8X8_THICK.as_ptr().cast::<u8>(), dest, &info) }; unsafe { BitUnPack(CGA_8X8_THICK.as_ptr().cast::<u8>(), dest, &info) };
} }
DISPCNT.write(DisplayControl::new().with_show_bg2(true)); let tsb = text_screenblock(31);
for y in 0..16_u16 {
for x in 0..16_u16 {
let tsb_i = y * 32 + x;
let t_i = y * 16 + x;
tsb.index(tsb_i as usize).write(TextEntry::new().with_tile_id(t_i));
}
}
BG0CNT.write(BackgroundControl::new().with_screenblock(31));
DISPCNT.write(DisplayControl::new().with_show_bg0(true));
let mut x_off = 0_u32;
let mut y_off = 0_u32;
let mut backdrop_color = Color(0);
loop { loop {
VBlankIntrWait(); VBlankIntrWait();
// show current frame
BACKDROP_COLOR.write(backdrop_color);
BG0HOFS.write(x_off as u16);
BG0VOFS.write(y_off as u16);
let k = KEYS.read(); // prep next frame
VALUE.write((k.to_u16() + 3) / k.to_u16()); // force a runtime division let k = FRAME_KEYS.read();
BACKDROP_COLOR.write(Color(k.to_u16())); backdrop_color = Color(k.to_u16());
if k.up() {
y_off = y_off.wrapping_add(1);
}
if k.down() {
y_off = y_off.wrapping_sub(1);
}
if k.left() {
x_off = x_off.wrapping_add(1);
}
if k.right() {
x_off = x_off.wrapping_sub(1);
}
} }
} }