From 5808f00555c48e1cc1cc110af6a5cd73ddf13010 Mon Sep 17 00:00:00 2001 From: Peter Fors Date: Fri, 2 May 2025 23:15:47 +0200 Subject: cleanup and rewrite of ppu_registers.c --- mappers/mapper_000_0.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 mappers/mapper_000_0.c (limited to 'mappers/mapper_000_0.c') diff --git a/mappers/mapper_000_0.c b/mappers/mapper_000_0.c new file mode 100644 index 0000000..b79cdbf --- /dev/null +++ b/mappers/mapper_000_0.c @@ -0,0 +1,22 @@ + + +__attribute__((hot)) +static uint8_t mapper_000_0_prg_read(struct nes_state *state, uint32_t addr) { + struct mapper_000_0 *mapper = (struct mapper_000_0 *)&state->map; + + return state->prg_rom[addr & mapper->mask]; +} + +__attribute__((hot)) +static uint8_t mapper_000_0_chr_read(struct nes_state *state, uint32_t addr) { + return state->chr_rom[addr]; +} + +static void mapper_000_0_init(struct nes_state *state) { + struct mapper_000_0 *mapper = (struct mapper_000_0 *)&state->map; + state->mapper.prg_read = mapper_000_0_prg_read; + state->mapper.chr_read = mapper_000_0_chr_read; + mapper->mask = (state->ines.prg_size == 16384) ? 0x3fff : 0x7fff; +} + + -- cgit v1.2.3