snes.h

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#ifndef YAZE_SNES_H_
#define YAZE_SNES_H_
 
#include <cstdint>
 
namespace yaze {
 
inline uint32_t SnesToPc(uint32_t addr) noexcept {
  constexpr uint32_t kFastRomRegion = 0x808000;
  if (addr >= kFastRomRegion) {
    addr -= kFastRomRegion;
  }
  uint32_t temp = (addr & 0x7FFF) + ((addr / 2) & 0xFF8000);
  return (temp + 0x0);
}
 
inline uint32_t PcToSnes(uint32_t addr) {
  uint8_t* b = reinterpret_cast<uint8_t*>(&addr);
  b[2] = static_cast<uint8_t>(b[2] * 2);
 
  if (b[1] >= 0x80) {
    b[2] += 1;
  } else {
    b[1] += 0x80;
  }
 
  return addr;
}
 
inline uint32_t Get24LocalFromPC(uint8_t* data, int addr, bool pc = true) {
  uint32_t ret =
      (PcToSnes(addr) & 0xFF0000) | (data[addr + 1] << 8) | data[addr];
  if (pc) {
    return SnesToPc(ret);
  }
  return ret;
}
 
inline int AddressFromBytes(uint8_t bank, uint8_t high, uint8_t low) noexcept {
  return (bank << 16) | (high << 8) | low;
}
 
inline uint32_t MapBankToWordAddress(uint8_t bank, uint16_t addr) noexcept {
  uint32_t result = 0;
  result = (bank << 16) | addr;
  return result;
}
 
}  // namespace yaze
 
#endif  // YAZE_SNES_H_