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early plane drawing stuff

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kirjavascript 2021-05-05 23:39:38 +01:00
parent 08f3a07e07
commit 0a52184b3e
1 changed files with 6 additions and 5 deletions
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11
emu/src/lib.rs
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@ -111,7 +111,6 @@ impl Megadrive {
};
}
#[allow(unused_variables)]
fn fire_beam(&mut self, line: usize) {
let (cellw, cellh) = self.core.mem.vdp.scroll_size();
let screen_width = self.core.mem.vdp.screen_width();
@ -139,11 +138,12 @@ impl Megadrive {
let planeb_nametable =
(self.core.mem.vdp.registers[4] as u32 & 3) << 10;
let planeb = &self.core.mem.vdp.VRAM[planeb_nametable as usize..];
let planeb = &self.core.mem.vdp.VRAM[planea_nametable as usize..];
let tiles = (0..cellw).map(|i| {
let offset = (i as usize * 2) ;
let mut offset = i as usize * 2;
offset += (line / 8) * cellw as usize * 2;
if i as usize + 1 > planeb.len() { return 0 }
(planeb[offset] as usize & 7) << 8 | planeb[offset + 1] as usize
}).collect::<Vec<_>>();
@ -153,6 +153,7 @@ impl Megadrive {
let tile_y = line & 7;
let y_offset = tile_y * 4;
// let y_offset = 0;
// for i in 0..0xFF {
@ -165,10 +166,10 @@ impl Megadrive {
for pixel in 0..screen_width {
if let Some(tile) = tiles.get(pixel / 8) {
let x_offset = pixel & 6;
let x_offset = (pixel & 6) >> 1;
let px = self.core.mem.vdp.VRAM[(tile * 32) + x_offset + y_offset];
let px = if pixel & 1 == 1 {
let px = if pixel & 1 == 0 {
px >> 4
} else {
px & 0xF