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make mode3 clear a little speedier

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Lokathor 2018-11-20 03:41:42 -07:00
parent c05eae7f13
commit 62abc3cbd2
1 changed files with 4 additions and 5 deletions
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9
src/video_ram.rs
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@ -69,13 +69,12 @@ pub fn mode3_read_pixel(col: isize, row: isize) -> Option<u16> {
/// Clears the entire screen to the color specified.
pub unsafe fn mode3_clear_screen(color: u16) {
// TODO: use DMA?
let color = color as u32;
let bulk_color = color << 16 | color;
let mut ptr = VolatilePtr(VRAM_BASE_ADDRESS as *mut u32);
for _ in 0..SCREEN_HEIGHT {
for _ in 0..(SCREEN_WIDTH / 2) {
ptr.write(bulk_color);
ptr = ptr.offset(1);
}
for _ in 0..(SCREEN_HEIGHT * SCREEN_WIDTH / 2) {
ptr.write(bulk_color);
ptr = ptr.offset(1);
}
}