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chore(ppu): reimplement fifo pixel merging logic

This commit is contained in:
Rekai Nyangadzayi Musuka 2021-06-02 23:32:20 -05:00
parent cd21c90722
commit 112454aa59
1 changed files with 18 additions and 21 deletions
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39
src/ppu.rs
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@ -346,33 +346,30 @@ impl Ppu {
}
if self.fifo.is_enabled() {
use RenderPriority::*;
// Handle Background Pixel and Sprite FIFO
let bg_enabled = self.control.bg_win_enabled();
let i0_colour = self.monochrome.bg_palette.i0_colour();
// FIXME: Is this the correct behaviour
let bg_zero_colour = self.monochrome.bg_palette.i0_colour();
let rgba_opt = self.fifo.back.pop_front().map(|bg_info| {
let bg_shade = if bg_enabled { bg_info.shade } else { i0_colour };
let maybe_rgba =
self.fifo
.back
.pop_front()
.map(|bg_info| match self.fifo.obj.pop_front() {
Some(obj_info) => match obj_info.shade {
Some(obj_shade) => match obj_info.priority {
RenderPriority::BackgroundAndWindow => match bg_info.shade {
GrayShade::White => obj_shade.into_rgba(),
_ if bg_enabled => bg_info.shade.into_rgba(),
_ => bg_zero_colour.into_rgba(),
},
RenderPriority::Object => obj_shade.into_rgba(),
},
None if bg_enabled => bg_info.shade.into_rgba(),
None => bg_zero_colour.into_rgba(),
match self.fifo.obj.pop_front() {
Some(obj_info) => match (obj_info.shade, obj_info.priority) {
(Some(obj_shade), BackgroundAndWindow) => match bg_info.shade {
GrayShade::White => obj_shade.into_rgba(),
_ => bg_shade.into_rgba(),
},
None if bg_enabled => bg_info.shade.into_rgba(),
None => bg_zero_colour.into_rgba(),
});
(Some(obj_shade), Object) => obj_shade.into_rgba(),
(None, _) => bg_shade.into_rgba(),
},
None => bg_shade.into_rgba(),
}
});
if let Some(rgba) = maybe_rgba.as_ref() {
if let Some(rgba) = rgba_opt.as_ref() {
let y = self.pos.line_y as usize;
let x = self.x_pos as usize;