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alexbevi
GitHub Repository: alexbevi/BizHawk
 Path: blob/master/quicknes/nes_emu/Mmc24.cpp
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#include <cstring>

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#include "Nes_Mapper.h"

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#include "blargg_source.h"

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#include "Mmc24.h"

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class MMC2: public Nes_Mapper

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{

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	byte regs[6]; // A,B,C,D,E,F

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	void mirror(byte val)

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	{

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		if (val & 1)

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			mirror_horiz();

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		else

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			mirror_vert();

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	}

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public:

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	MMC2()

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	{

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		register_state(regs, sizeof(regs));

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	}

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	virtual void reset_state()

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	{

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		std::memset(regs, 0, sizeof(regs));

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	}

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	virtual void apply_mapping()

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	{

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		mirror(regs[5]);

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		set_prg_bank(0x8000, bank_8k, regs[0]);

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		set_prg_bank(0xa000, bank_8k, 13);

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		set_prg_bank(0xc000, bank_8k, 14);

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		set_prg_bank(0xe000, bank_8k, 15);

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		set_chr_bank(0x0000, bank_4k, regs[1]);

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		set_chr_bank(0x1000, bank_4k, regs[3]);

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		set_chr_bank_ex(0x0000, bank_4k, regs[2]);

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		set_chr_bank_ex(0x1000, bank_4k, regs[4]);

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	}

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	virtual void write(nes_time_t, nes_addr_t addr, int data)

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	{

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		switch (addr >> 12)

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		{

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		case 0xa: regs[0] = data; set_prg_bank(0x8000, bank_8k, data); break;

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		case 0xb: regs[1] = data; set_chr_bank(0x0000, bank_4k, data); break;

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		case 0xc: regs[2] = data; set_chr_bank_ex(0x0000, bank_4k, data); break;

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		case 0xd: regs[3] = data; set_chr_bank(0x1000, bank_4k, data); break;

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		case 0xe: regs[4] = data; set_chr_bank_ex(0x1000, bank_4k, data); break;

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		case 0xf: regs[5] = data; mirror(data); break;

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		}

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	}

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};

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class MMC4: public Nes_Mapper

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{

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	byte regs[6]; // A,B,C,D,E,F

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	void mirror(byte val)

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	{

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		if (val & 1)

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			mirror_horiz();

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		else

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			mirror_vert();

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	}

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public:

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	MMC4()

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	{

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		register_state(regs, sizeof(regs));

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	}

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	virtual void reset_state()

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	{

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		std::memset(regs, 0, sizeof(regs));

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	}

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	virtual void apply_mapping()

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	{

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		enable_sram();

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		mirror(regs[5]);

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		set_prg_bank(0x8000, bank_16k, regs[0]);

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		set_chr_bank(0x0000, bank_4k, regs[1]);

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		set_chr_bank(0x1000, bank_4k, regs[3]);

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		set_chr_bank_ex(0x0000, bank_4k, regs[2]);

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		set_chr_bank_ex(0x1000, bank_4k, regs[4]);

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	}

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	virtual void write(nes_time_t, nes_addr_t addr, int data)

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	{

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		switch (addr >> 12)

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		{

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		case 0xa: regs[0] = data; set_prg_bank(0x8000, bank_16k, data); break;

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		case 0xb: regs[1] = data; set_chr_bank(0x0000, bank_4k, data); break;

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		case 0xc: regs[2] = data; set_chr_bank_ex(0x0000, bank_4k, data); break;

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		case 0xd: regs[3] = data; set_chr_bank(0x1000, bank_4k, data); break;

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		case 0xe: regs[4] = data; set_chr_bank_ex(0x1000, bank_4k, data); break;

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		case 0xf: regs[5] = data; mirror(data); break;

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		}

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	}

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};

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void register_mmc24()

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{

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	register_mapper<MMC2>(9);

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	register_mapper<MMC4>(10);

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}

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