mappers/mapper_011_0.c


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static uint8_t mapper_011_0_prg_read(struct nes_state *state, uint32_t addr) {
	struct mapper_011_0 *mapper = (struct mapper_011_0 *)&state->map;

	if(addr >= 0x8000) {
		return mapper->prg_rom[addr - 0x8000];
	}
	return 0;
}

static void mapper_011_0_prg_write(struct nes_state *state, uint32_t addr, uint8_t value) {
	struct mapper_011_0 *mapper = (struct mapper_011_0 *)&state->map;

	if(addr >= 0x8000) {
		mapper->prg_rom = state->prg_rom + ((value >> 4) & 7) * 0x8000;
		mapper->chr_ptr = state->chr_rom + (value & 0x0F) * 0x2000;
	}
}

static uint8_t mapper_011_0_chr_read(struct nes_state *state, uint32_t addr) {
	struct mapper_011_0 *mapper = (struct mapper_011_0 *)&state->map;

	return mapper->chr_ptr[addr];
}

static void mapper_011_0_init(struct nes_state *state) {
	struct mapper_011_0 *mapper = (struct mapper_011_0 *)&state->map;

	mapper->prg_rom = state->prg_rom;
	mapper->chr_ptr = state->chr_rom;

	state->mapper.prg_read		= mapper_011_0_prg_read;
	state->mapper.prg_write		= mapper_011_0_prg_write;
	state->mapper.chr_read		= mapper_011_0_chr_read;
}