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vram dma increments

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This commit is contained in:
Alex Janka 2023-04-24 20:12:27 +10:00
parent d3c67622eb
commit 2eae8875ca
1 changed files with 12 additions and 7 deletions
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19
lib/src/processor/memory/mmio/cgb/vram_dma.rs
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@ -86,22 +86,27 @@ where
let returning = if let Some(cgb_peripherals) = &mut self.cgb_peripherals {
match cgb_peripherals.vram_dma.mode {
DmaMode::Halt(l) => {
let length = 16 * ((l as u16) + 1);
copy = Some((
cgb_peripherals.vram_dma.destination,
cgb_peripherals.vram_dma.source,
16 * ((l as u16) + 1),
cgb_peripherals.vram_dma.destination,
length,
));
cgb_peripherals.vram_dma.source += length;
cgb_peripherals.vram_dma.destination += length;
cgb_peripherals.vram_dma.mode = DmaMode::Waiting;
((l as usize) + 1) * 8
}
DmaMode::Hblank(l, ref mut progress) => {
if self.gpu.get_mode() == DrawMode::HBlank {
let offset = *progress * 16;
let length = 16;
copy = Some((
cgb_peripherals.vram_dma.destination + offset,
cgb_peripherals.vram_dma.source + offset,
16,
cgb_peripherals.vram_dma.source,
cgb_peripherals.vram_dma.destination,
length,
));
cgb_peripherals.vram_dma.source += length;
cgb_peripherals.vram_dma.destination += length;
*progress += 1;
if *progress > (l as u16) {
cgb_peripherals.vram_dma.mode = DmaMode::Waiting
@ -118,7 +123,7 @@ where
};
if let Some((source, dest, length)) = copy {
for i in 0..length {
self.set(dest + i, self.get(source + i));
self.set(source + i, self.get(dest + i));
}
}
if self.is_double_speed() {