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Tiny performance improvement with dma to copy the tile data

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This commit is contained in:
Gwilym Kuiper 2022-02-14 20:57:12 +00:00
parent 898b06110f
commit 63dd837518
2 changed files with 37 additions and 6 deletions
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39
agb/src/display/background.rs
View file

@ -20,7 +20,7 @@ use super::{
};
const TILE_BACKGROUND: MemoryMapped1DArray<u32, { 2048 * 8 }> =
unsafe { MemoryMapped1DArray::new(0x06000000) };
unsafe { MemoryMapped1DArray::new(0x0600_0000) };
const PALETTE_BACKGROUND: MemoryMapped1DArray<u16, 256> =
unsafe { MemoryMapped1DArray::new(0x0500_0000) };
@ -219,10 +219,16 @@ impl<'a> VRamManager<'a> {
unsafe { debug_unreachable_unchecked() };
};
let tile_size_in_words = TileFormat::FourBpp.tile_size() / 4;
let tile_size_in_half_words = TileFormat::FourBpp.tile_size() / 2;
for (i, &word) in tile_slice.iter().enumerate() {
TILE_BACKGROUND.set(index_to_copy_into * tile_size_in_words + i, word);
const TILE_BACKGROUND_ADDRESS: usize = 0x0600_0000;
unsafe {
dma_copy(
tile_slice.as_ptr() as *const u16,
(TILE_BACKGROUND_ADDRESS as *mut u16)
.add(index_to_copy_into * tile_size_in_half_words),
tile_size_in_half_words,
);
}
self.tile_set_to_vram.insert(
@ -703,3 +709,28 @@ impl<'a, T> Drop for MapLoan<'a, T> {
.set(self.background_id as usize, false);
}
}
const fn dma_source_addr(dma: usize) -> usize {
0x0400_00b0 + 0x0c * dma
}
const fn dma_dest_addr(dma: usize) -> usize {
0x0400_00b4 + 0x0c * dma
}
const fn dma_control_addr(dma: usize) -> usize {
0x0400_00b8 + 0x0c * dma
}
const DMA3_SOURCE_ADDR: MemoryMapped<u32> = unsafe { MemoryMapped::new(dma_source_addr(3)) };
const DMA3_DEST_ADDR: MemoryMapped<u32> = unsafe { MemoryMapped::new(dma_dest_addr(3)) };
const DMA3_CONTROL: MemoryMapped<u32> = unsafe { MemoryMapped::new(dma_control_addr(3)) };
unsafe fn dma_copy(src: *const u16, dest: *mut u16, count: usize) {
assert!(count < u16::MAX as usize);
DMA3_SOURCE_ADDR.set(src as u32);
DMA3_DEST_ADDR.set(dest as u32);
DMA3_CONTROL.set(count as u32 | (1 << 31));
}

4
examples/the-hat-chooses-the-wizard/src/main.rs
View file

@ -796,8 +796,8 @@ fn main(mut agb: agb::Gba) -> ! {
object.set_sprite_palettes(object_sheet::object_sheet.palettes);
object.set_sprite_tilemap(object_sheet::object_sheet.tiles);
for y in 0..20u16 {
for x in 0..30u16 {
for y in 0..32u16 {
for x in 0..32u16 {
world_display.set_tile(
&mut vram,
(x, y).into(),