1use jgenesis_proc_macros::{FakeDecode, FakeEncode};
2use std::ops::Deref;

5pub const NTSC_MASTER_CLOCK_FREQUENCY: u64 = 21_477_270;
6pub const PAL_MASTER_CLOCK_FREQUENCY: u64 = 21_281_370;

8pub const LOROM_CHIPSET_BYTE_ADDRESS: usize = 0x7FD6;
9
10#[derive(Debug, Clone, Default, FakeEncode, FakeDecode)]
11pub struct Rom(pub Box<[u8]>);
12
13impl Deref for Rom {
14    type Target = Box<[u8]>;
15
16    fn deref(&self) -> &Self::Target {
17        &self.0
18    }
19}
20
21pub fn lorom_map_rom_address(address: u32, rom_len: u32) -> u32 {
22    // LoROM mapping ignores A23 and A15, and A16-22 are shifted right 1
23    let rom_addr = ((address & 0x7F0000) >> 1) | (address & 0x007FFF);
24    rom_addr & (rom_len - 1)
25}
26
27macro_rules! impl_take_set_rom {
28    ($rom:ident) => {
29        #[must_use]
30        pub fn take_rom(&mut self) -> ::std::vec::Vec<u8> {
31            ::std::mem::take(&mut self.$rom.0).into_vec()
32        }
33
34        pub fn set_rom(&mut self, rom: ::std::vec::Vec<u8>) {
35            self.$rom.0 = rom.into_boxed_slice();
36        }
37    };
38}
39
40pub(crate) use impl_take_set_rom;