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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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70
NES Emulator/cartridge.c
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@ -3,6 +3,7 @@
#include <stdio.h>
#include "bus.h"
#include "mapper.h"
struct Cartridge* createCartridge(struct Bus* parent, const char* filepath)
{
@ -17,63 +18,42 @@ struct Cartridge* createCartridge(struct Bus* parent, const char* filepath)
fread(&cartridge->header, sizeof(cartridge->header), 1, fp);
cartridge->prg_rom = (Byte*)malloc(0x4000 * (size_t)cartridge->header.prg_rom_size);
if (cartridge->prg_rom == NULL)
{
fprintf(stderr, "Failed to allocate PRG memory for cartridge, aborting.\n");
exit(1);
}
cartridge->chr_rom = (Byte*)malloc(0x2000 * (size_t)cartridge->header.chr_rom_size);
if (cartridge->chr_rom == NULL)
{
fprintf(stderr, "Failed to allocate CHR memory for cartridge, aborting.\n");
exit(1);
}
fread(cartridge->prg_rom, 0x4000, cartridge->header.prg_rom_size, fp);
fread(cartridge->chr_rom, 0x2000, cartridge->header.chr_rom_size, fp);
Byte mapperID = (cartridge->header.Flags7.mapper_upper_nibble << 4) | cartridge->header.Flags6.mapper_lower_nibble;
cartridge->mapper = createMapper(mapperID, cartridge->header.prg_rom_size, cartridge->header.chr_rom_size, fp);
cartridge->bus = parent;
fclose(fp);
return cartridge;
}
void destroyCartridge(struct Cartridge* cartridge)
{
free(cartridge->chr_rom);
free(cartridge->prg_rom);
destroyMapper(cartridge->mapper);
free(cartridge);
}
Byte readCartridge(struct Cartridge* cartridge, Word addr)
Byte readCartridgeCPU(struct Cartridge* cartridge, Word addr)
{
// TODO: Force M000 mapper for now
Byte val = 0;
if (0x6000 <= addr && addr <= 0x7FFF) // PRG RAM
{
// do nothing for now
}
else if (0x8000 <= addr && addr <= 0xFFFF) // PRG ROM
{
val = cartridge->prg_rom[addr % 0x4000];
}
return val;
return MapperReadCPU(cartridge->mapper, addr);
}
void writeCartridge(struct Cartridge* cartridge, Word addr, Byte val)
Byte readCartridgePPU(struct Cartridge* cartridge, Word addr)
{
// TODO: Force M000 mapper for now
if (0x6000 <= addr && addr <= 0x7FFF) // PRG RAM
{
// do nothing for now
}
else if (0x8000 <= addr && addr <= 0xFFFF) // PRG ROM
{
cartridge->prg_rom[addr % 0x4000] = val;
}
return MapperReadPPU(cartridge->mapper, addr);
}
void writeCartridgeCPU(struct Cartridge* cartridge, Word addr, Byte val)
{
MapperWriteCPU(cartridge->mapper, addr, val);
}
void writeCartridgePPU(struct Cartridge* cartridge, Word addr, Byte val)
{
MapperReadPPU(cartridge->mapper, addr, val);
}
void getPatternTableTexture(struct Cartridge* cartridge, SDL_Texture* texture, int index)
{
GetPatternTableTexture(cartridge->mapper, texture, index);
}