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added mappers (not working)

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Lauchmelder 2021-10-28 16:57:37 +02:00
parent 034645154d
commit 9039fa0ccf
14 changed files with 512 additions and 106 deletions
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105
NES Emulator/mappers/mapper000.c Normal file
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#include "mapper000.h"
#include <stdlib.h>
#include <stdio.h>
struct Mapper000* createMapper000(Byte prg_rom_size, Byte chr_rom_size, FILE* fp)
{
struct Mapper000* mapper = (struct Mapper000*)malloc(sizeof(struct Mapper000));
if (mapper == NULL)
{
fprintf(stderr, "Failed to create Mapper 000. Aborting\n");
exit(-1);
}
mapper->prg_rom_size = prg_rom_size;
mapper->prg_rom = (Byte*)calloc(prg_rom_size, 0x4000);
if (mapper->prg_rom == NULL)
{
fprintf(stderr, "Failed to allocate cartridge PRG ROM. Aborting\n");
exit(-1);
}
mapper->chr_rom_size = chr_rom_size;
mapper->chr_rom = (Byte*)calloc(chr_rom_size, 0x2000);
if (mapper->chr_rom == NULL)
{
fprintf(stderr, "Failed to allocate cartridge CHR ROM. Aborting\n");
exit(-1);
}
fread(mapper->prg_rom, 0x4000, prg_rom_size, fp);
fread(mapper->chr_rom, 0x2000, chr_rom_size, fp);
return mapper;
}
void destroyMapper000(struct Mapper000* mapper)
{
free(mapper->chr_rom);
free(mapper->prg_rom);
free(mapper);
}
Byte Mapper000_ReadCPU(struct Mapper000* mapper, Word address)
{
Byte val = 0x00;
if (address >= 0x6000 && address < 0x8000)
{
fprintf(stderr, "This Mapper 000 implementation doesnt support FamilyBasic PRG RAM\n");
exit(-1);
}
else if (address >= 0x8000)
{
Word effectiveAddress = address - 0x8000;
effectiveAddress %= 0x4000 * (mapper->prg_rom_size == 1);
val = mapper->prg_rom[effectiveAddress];
}
else
{
fprintf(stderr, "Cartridge read access violation by the CPU at $%04X\n", address);
exit(-1);
}
return val;
}
Byte Mapper000_ReadPPU(struct Mapper000* mapper, Word address)
{
Byte val = 0x00;
if (address >= 0x2000)
{
fprintf(stderr, "Cartridge read access violation by the PPU at $%04X\n", address);
exit(-1);
}
else
{
val = mapper->chr_rom[address];
}
return val;
}
void Mapper000_WriteCPU(struct Mapper000* mapper, Word address, Byte value)
{
// nothing
}
void Mapper000_WritePPU(struct Mapper000* mapper, Word address, Byte value)
{
// nothing
}
void Mapper000_GetPatternTableTexture(struct Mapper000* mapper, SDL_Texture* texture, int index)
{
int pitch;
void* pixels;
SDL_LockTexture(texture, NULL, &pixels, &pitch);
SDL_memcpy(pixels, mapper->chr_rom + 0x1000 * index, 0x1000);
SDL_UnlockTexture(texture);
}

27
NES Emulator/mappers/mapper000.h Normal file
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#ifndef _MAPPER_000_
#define _MAPPER_000_
#include <stdio.h>
#include "../types.h"
#include "SDL.h"
struct Mapper000
{
Byte prg_rom_size;
Byte chr_rom_size;
Byte* prg_rom;
Byte* chr_rom;
};
struct Mapper000* createMapper000(Byte prg_rom_size, Byte chr_rom_size, FILE* fp);
void destroyMapper000(struct Mapper000* mapper);
Byte Mapper000_ReadCPU(struct Mapper000* mapper, Word address);
Byte Mapper000_ReadPPU(struct Mapper000* mapper, Word address);
void Mapper000_WriteCPU(struct Mapper000* mapper, Word address, Byte value);
void Mapper000_WritePPU(struct Mapper000* mapper, Word address, Byte value);
void Mapper000_GetPatternTableTexture(struct Mapper000* mapper, SDL_Texture* texture, int index);
#endif _MAPPER_000_