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Small PPU refactor for HDMA addresses

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This commit is contained in:
Franco Colmenarez 2022-10-12 08:07:25 -05:00
parent a69c5be762
commit 885bfea434
1 changed files with 17 additions and 12 deletions
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29
src/ppu.rs
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@ -390,17 +390,14 @@ impl PPU {
} }
pub fn get_register(&self, address: u16) -> u8 { pub fn get_register(&self, address: u16) -> u8 {
if address >= 0xFF51 && address <= 0xFF55 { if address >= HDMA1_ADDRESS && address <= HDMA5_ADDRESS {
if address == HDMA1_ADDRESS { return match address {
return self.hdma_source.to_be_bytes()[0]; HDMA1_ADDRESS => self.hdma_source.to_be_bytes()[0],
} else if address == HDMA2_ADDRESS { HDMA2_ADDRESS => self.hdma_source.to_be_bytes()[1],
return self.hdma_source.to_be_bytes()[1]; HDMA3_ADDRESS => self.hdma_destination.to_be_bytes()[0],
} else if address == HDMA3_ADDRESS { HDMA4_ADDRESS => self.hdma_destination.to_be_bytes()[1],
return self.hdma_destination.to_be_bytes()[0]; HDMA5_ADDRESS => self.hdma_start,
} else if address == HDMA4_ADDRESS { _ => 0x00,
return self.hdma_destination.to_be_bytes()[1];
} else if address == HDMA5_ADDRESS {
return self.hdma_start;
} }
} else if address >= 0xFF68 && address <= 0xFF6B { } else if address >= 0xFF68 && address <= 0xFF6B {
return self.cram_registers[(address as usize) - 0xFF68]; return self.cram_registers[(address as usize) - 0xFF68];
@ -415,7 +412,15 @@ impl PPU {
} }
pub fn set_register(&mut self, address: u16, data: u8) { pub fn set_register(&mut self, address: u16, data: u8) {
if address >= 0xFF51 && address <= 0xFF55 { if address >= HDMA1_ADDRESS && address <= HDMA5_ADDRESS {
match address {
HDMA1_ADDRESS => self.hdma_source = (self.hdma_source & 0xFF) | ((data as u16) << 8),
HDMA2_ADDRESS => self.hdma_source = (self.hdma_source & 0xFF00) | (data as u16),
HDMA3_ADDRESS => self.hdma_destination = (self.hdma_destination & 0xFF) | ((data as u16) << 8),
HDMA4_ADDRESS => self.hdma_destination = (self.hdma_destination & 0xFF00) | (data as u16),
HDMA5_ADDRESS => self.hdma_start = data,
_ => (),
};
if address == HDMA1_ADDRESS { if address == HDMA1_ADDRESS {
self.hdma_source = (self.hdma_source & 0xFF) | ((data as u16) << 8); self.hdma_source = (self.hdma_source & 0xFF) | ((data as u16) << 8);
} else if address == HDMA2_ADDRESS { } else if address == HDMA2_ADDRESS {