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fix(ppu): improve accuracy of SCX discard

This commit is contained in:
Rekai Nyangadzayi Musuka 2021-08-14 22:03:01 -05:00
parent e27d6dc25b
commit d68257bb29
1 changed files with 2 additions and 2 deletions
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4
src/ppu.rs
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@ -381,12 +381,12 @@ impl Ppu {
} }
if self.fifo.is_enabled() { if self.fifo.is_enabled() {
if self.x_pos == 0 && !self.fifo.back.is_empty() && self.scanline_start { if self.x_pos == 0 && self.scanline_start {
self.to_discard = self.pos.scroll_x % 8; self.to_discard = self.pos.scroll_x % 8;
self.scanline_start = false; self.scanline_start = false;
} }
if self.to_discard > 0 { if self.to_discard > 0 && !self.fifo.back.is_empty() {
let _ = self.fifo.back.pop_front(); let _ = self.fifo.back.pop_front();
self.to_discard -= 1; self.to_discard -= 1;