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first draft of an unpack wrapper, we probably want to use VolRegion or similar

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This commit is contained in:
Lokathor 2022-10-09 12:21:23 -06:00
parent 1af762bde6
commit 335d8c0455
2 changed files with 31 additions and 10 deletions
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12
examples/hello.rs
View file

@ -1,7 +1,7 @@
#![no_std]
#![no_main]
use core::{fmt::Write, mem::size_of_val};
use core::fmt::Write;
use gba::{
mgba::{MgbaBufferedLogger, MgbaMessageLevel},
prelude::*,
@ -63,15 +63,7 @@ extern "C" fn main() -> ! {
{
// get our tile data into memory.
let src = CGA_8X8_THICK.as_ptr().cast::<u8>();
let dest = CHARBLOCK0_4BPP.index(0).as_usize() as *mut u32;
let info = BitUnpackInfo {
src_byte_len: size_of_val(&CGA_8X8_THICK) as u16,
src_elem_width: 1,
dest_elem_width: 4,
offset_and_touch_zero: 0,
};
unsafe { BitUnPack(src, dest, &info) };
Cga8x8Thick.bitunpack_to_4bpp(CHARBLOCK0_4BPP, 0);
}
{

29
src/builtin_art/cga_8x8_thick.rs
View file

@ -1,3 +1,12 @@
use core::mem::size_of_val;
use voladdress::{Safe, VolBlock};
use crate::{
bios::{BitUnPack, BitUnpackInfo},
video::Tile4,
};
/// The CGA [Code Page 437][cp437] type face, with thick lines.
///
/// There's 256 tiles, packed down to 1bpp. To decompress this into 4bpp tile
@ -131,3 +140,23 @@ pub static CGA_8X8_THICK: [u32; 512] = [
0x3636361E, 0x00000036, 0x060C180E, 0x0000001E, 0x3C3C0000, 0x00003C3C,
0x00000000, 0x00000000,
];
#[derive(Debug, Clone, Copy)]
pub struct Cga8x8Thick;
impl Cga8x8Thick {
#[inline]
pub fn bitunpack_to_4bpp(
self, b: VolBlock<Tile4, Safe, Safe, 512>, offset_and_touch_zero: u32,
) {
let src = CGA_8X8_THICK.as_ptr();
let dest = b.index(0).as_usize() as *mut u32;
let info = BitUnpackInfo {
src_byte_len: size_of_val(&CGA_8X8_THICK) as u16,
src_elem_width: 1,
dest_elem_width: 4,
offset_and_touch_zero,
};
unsafe { BitUnPack(src.cast(), dest, &info) };
}
}