nese/src/memory.h

#ifndef NESE_MEMORY_H_
#define NESE_MEMORY_H_

#include <stdint.h>

#include "apu.h"
#include "input.h"
#include "mapper.h"
#include "ppu.h"

#include "serdes.h"


#define NES_RAM_SIZE  (0x2000U)
#define NES_SRAM_SIZE (0x2000U)

#define NES_PRG_ROM_PAGE_SIZE   (0x2000U)


typedef enum {
    nes_Mem_SRAM_Used = 0b00000001,
} nes_Memory_Flag;

struct nes_Memory {
#ifdef F6502_FLAT
    uint8_t ram[65536];
#else
    // Dynamic (set on init/reload)
    uint8_t* sram_bank; // Mapped to 0x6000 - 0x7FFF
    uint8_t* rom;
    uint8_t* rom_bank[4];

    // Dynamic (specific init/reload)
    nes_Mapper mapper;
    nes_PPU_Memory ppu;

    // Static
    nes_Input input;
    nes_APU_Memory apu;

    uint8_t ram[NES_RAM_SIZE / 4]; // Mirrored 3x
    uint8_t sram[NES_SRAM_SIZE];
    nes_Memory_Flag flags;
    int n_rom_banks;
#endif
};
typedef struct nes_Memory nes_Memory;


static inline uint8_t* prg_rom_page(nes_Memory* mem, int page) {
    return &mem->rom[page * NES_PRG_ROM_PAGE_SIZE];
}


extern const Serdes_Item nes_memory_serdes[];


#endif // NESE_MEMORY_H_