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Add an example for a basic pong game with mode 3 graphics and drawing…
… on vblank. (#189) * Create mode3_pong_example_game.rs * Update mode3_pong_example_game.rs * Update mode3_pong_example_game.rs
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/* | ||
* Made by Evan Goemer | ||
* Discord: @evangoemer | ||
*/ | ||
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#![no_std] | ||
#![no_main] | ||
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use gba::{prelude::*, mem_fns::__aeabi_memset}; | ||
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const SCREEN_WIDTH: u16 = 240; | ||
const SCREEN_HEIGHT: u16 = 160; | ||
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const PADDLE_WIDTH: u16 = 4; | ||
const PADDLE_HEIGHT: u16 = 20; | ||
const BALL_SIZE: u16 = 2; | ||
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struct Paddle { | ||
x: u16, | ||
y: u16, | ||
} | ||
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struct Ball { | ||
x: u16, | ||
y: u16, | ||
dx: i16, | ||
dy: i16, | ||
} | ||
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impl Paddle { | ||
fn new(x: u16, y: u16) -> Self { | ||
Self { | ||
x, | ||
y, | ||
} | ||
} | ||
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fn update(&mut self) { | ||
let keys = KEYINPUT.read(); | ||
if keys.up() && self.y > 1 { | ||
self.y -= 1; | ||
} | ||
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if keys.down() && self.y + PADDLE_HEIGHT + 1 < SCREEN_HEIGHT { | ||
self.y += 1; | ||
} | ||
} | ||
} | ||
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impl Ball { | ||
fn new(x: u16, y: u16) -> Self { | ||
Self { x, y, dx: 1, dy: 1 } | ||
} | ||
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fn update(&mut self, paddle1: &Paddle, paddle2: &Paddle) { | ||
if self.y <= 0 || self.y + BALL_SIZE >= SCREEN_HEIGHT { | ||
self.dy = -self.dy; | ||
} | ||
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if self.x + BALL_SIZE >= paddle1.x | ||
&& self.x <= paddle1.x + PADDLE_WIDTH | ||
&& self.y + BALL_SIZE >= paddle1.y | ||
&& self.y <= paddle1.y + PADDLE_HEIGHT | ||
{ | ||
self.dx = -self.dx; | ||
self.dy = -self.dy; | ||
} | ||
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if self.x + BALL_SIZE >= paddle2.x | ||
&& self.x <= paddle2.x + PADDLE_WIDTH | ||
&& self.y + BALL_SIZE >= paddle2.y | ||
&& self.y <= paddle2.y + PADDLE_HEIGHT | ||
{ | ||
self.dx = -self.dx; | ||
self.dy = -self.dy; | ||
} | ||
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if self.x + BALL_SIZE <= 1 + BALL_SIZE { | ||
self.x = SCREEN_WIDTH / 2 - BALL_SIZE / 2; | ||
self.y = SCREEN_HEIGHT / 2 - BALL_SIZE / 2; | ||
self.dx = 1; | ||
self.dy = 1; | ||
} | ||
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if self.x >= SCREEN_WIDTH - BALL_SIZE - 1 { | ||
self.x = SCREEN_WIDTH / 2 - BALL_SIZE / 2; | ||
self.y = SCREEN_HEIGHT / 2 - BALL_SIZE / 2; | ||
self.dx = -1; | ||
self.dy = 1; | ||
} | ||
self.x = (self.x as i16 + self.dx) as u16; | ||
self.y = (self.y as i16 + self.dy) as u16; | ||
} | ||
} | ||
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static SPRITE_POSITIONS: [GbaCell<u16>; 6] = [ | ||
GbaCell::new(0), | ||
GbaCell::new(0), | ||
GbaCell::new(0), | ||
GbaCell::new(0), | ||
GbaCell::new(0), | ||
GbaCell::new(0), | ||
]; | ||
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#[panic_handler] | ||
fn panic_handler(_: &core::panic::PanicInfo) -> ! { | ||
loop {} | ||
} | ||
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#[no_mangle] | ||
fn main() -> ! { | ||
DISPCNT.write( | ||
DisplayControl::new().with_video_mode(VideoMode::_3).with_show_bg2(true), | ||
); | ||
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RUST_IRQ_HANDLER.write(Some(draw_sprites)); | ||
DISPSTAT.write(DisplayStatus::new().with_irq_vblank(true)); | ||
IE.write(IrqBits::VBLANK); | ||
IME.write(true); | ||
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let mut left_paddle = Paddle::new(10, SCREEN_HEIGHT as u16 / 2 - PADDLE_HEIGHT / 2); | ||
let mut right_paddle = Paddle::new(SCREEN_WIDTH as u16 - 10 - PADDLE_WIDTH, SCREEN_HEIGHT as u16 / 2 - PADDLE_HEIGHT / 2); | ||
let mut ball = Ball::new(SCREEN_WIDTH as u16 / 2, SCREEN_HEIGHT as u16 / 2); | ||
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loop { | ||
left_paddle.update(); | ||
right_paddle.update(); | ||
ball.update(&left_paddle, &right_paddle); | ||
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SPRITE_POSITIONS[0].write(left_paddle.x); | ||
SPRITE_POSITIONS[1].write(left_paddle.y); | ||
SPRITE_POSITIONS[2].write(right_paddle.x); | ||
SPRITE_POSITIONS[3].write(right_paddle.y); | ||
SPRITE_POSITIONS[4].write(ball.x); | ||
SPRITE_POSITIONS[5].write(ball.y); | ||
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VBlankIntrWait(); | ||
} | ||
} | ||
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extern "C" fn draw_sprites(_bits: IrqBits) { | ||
unsafe { | ||
let p = VIDEO3_VRAM.as_usize() as *mut u8; | ||
__aeabi_memset(p, 240*160*2, 0) | ||
} | ||
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draw_rect(SPRITE_POSITIONS[0].read(), SPRITE_POSITIONS[1].read(), PADDLE_WIDTH, PADDLE_HEIGHT, Color::WHITE); | ||
draw_rect(SPRITE_POSITIONS[2].read(), SPRITE_POSITIONS[3].read(), PADDLE_WIDTH, PADDLE_HEIGHT, Color::WHITE); | ||
draw_rect(SPRITE_POSITIONS[4].read(), SPRITE_POSITIONS[5].read(), BALL_SIZE, BALL_SIZE, Color::WHITE); | ||
} | ||
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fn draw_rect(x: u16, y: u16, width: u16, height: u16, color: Color) { | ||
for i in 0..width { | ||
for j in 0..height { | ||
VIDEO3_VRAM.index((x + i) as usize, (y + j) as usize).write(color); | ||
} | ||
} | ||
} |