Clear VRAM after Boot ROM

Fixes blank areas in some CGB Games
IsaacMarovitz · May 7, 2024 · d4b5bac · d4b5bac
1 parent 0a56aa9
commit d4b5bac
Show file tree

Hide file tree

Showing 2 changed files with 8 additions and 1 deletion.
diff --git a/src/components/mmu.rs b/src/components/mmu.rs
@@ -167,7 +167,10 @@ impl Memory for MMU {
  0xFF04..=0xFF07 => self.timer.write(a, v),
  0xFF10..=0xFF3F => self.apu.write(a, v),
  0xFF0F => self.intf = Interrupts::from_bits_truncate(v),
- 0xFF50 => self.boot_rom_enabled = false,
+ 0xFF50 => {
+ self.boot_rom_enabled = false;
+ self.ppu.clear_vram();
+ },
  // TODO: RP
  0xFF56 => { },
  0xFF51..=0xFF6F => self.ppu.write(a, v),

diff --git a/src/components/ppu/ppu.rs b/src/components/ppu/ppu.rs
@@ -445,6 +445,10 @@ impl PPU {
  }
  }
 
+ pub fn clear_vram(&mut self) {
+ self.vram = [0; 0x4000];
+ }
+
  fn read_vram(&self, a: u16, bank: usize) -> u8 {
  self.vram[(bank * 0x2000) + a as usize - 0x8000]
  }