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fix(ppu): implement slightly better SCX discarding

This commit is contained in:
Rekai Nyangadzayi Musuka 2021-06-17 18:29:22 -05:00
parent aa0e3399f6
commit 0b50e4eae9
1 changed files with 4 additions and 5 deletions
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9
src/ppu.rs
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@ -381,12 +381,11 @@ impl Ppu {
if self.fifo.is_enabled() { if self.fifo.is_enabled() {
use RenderPriority::*; use RenderPriority::*;
if self.x_pos == 0 { if self.x_pos == 0 && !self.fifo.back.is_empty() {
// Start of a Scanline let to_discard = self.pos.scroll_x % 8;
let discarded_count = self.pos.scroll_x % 8;
for _ in 0..discarded_count { for _ in 0..to_discard {
let _ = self.fifo.back.pop_back(); let _ = self.fifo.back.pop_front();
} }
} }