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Sprite flip implementation

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Franco Colmenarez 2021-11-05 08:32:02 -05:00
parent 488f36272c
commit e490228c39
1 changed files with 18 additions and 2 deletions
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20
src/ppu.rs
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@ -114,7 +114,6 @@ impl Sprite {
} }
pub fn get_pixel(&self, lcd_x: u8, lcd_y: u8, bus: &Bus) -> Option<Pixel> { pub fn get_pixel(&self, lcd_x: u8, lcd_y: u8, bus: &Bus) -> Option<Pixel> {
// todo!("Implement sprite flipping");
if lcd_x < self.x.saturating_sub(8) || lcd_x >= self.x { if lcd_x < self.x.saturating_sub(8) || lcd_x >= self.x {
return None; return None;
} }
@ -127,8 +126,25 @@ impl Sprite {
let x = lcd_x.saturating_sub(self.x.saturating_sub(8)); let x = lcd_x.saturating_sub(self.x.saturating_sub(8));
let y = lcd_y.saturating_sub(self.y .saturating_sub(16)); let y = lcd_y.saturating_sub(self.y .saturating_sub(16));
let x = match self.x_flip {
true => 7 - x,
false => x,
};
let y = match self.y_flip {
true => height - 1 - y,
false => y,
};
let mut tile_number = self.tile_number;
if self.is_long && x <= 7 {
tile_number = tile_number & 0xFE;
} else if self.is_long && x > 7 {
tile_number = tile_number | 0x01;
}
let tile_line = y.rem_euclid(height) * 2; let tile_line = y.rem_euclid(height) * 2;
let addr = 0x8000 + (self.tile_number as u16 * 16) + tile_line as u16; let addr = 0x8000 + (tile_number as u16 * 16) + tile_line as u16;
let tile_byte_1 = bus.read(addr); let tile_byte_1 = bus.read(addr);
let tile_byte_2 = bus.read(addr + 1); let tile_byte_2 = bus.read(addr + 1);