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Add support for using the solar sensor without requiring a Boktai ROM (#2221)

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* Add a `GBAHeader` struct

* Add extra `GBAAddon` entries for the Boktai carts

- Each game in the trilogy has a different effect on Lunar Knights (the only commercial DS game to support the solar sensor)

* Copy the logo data from the NDS ROM's header to the Boktai stub's header
This commit is contained in:
Jesse Talavera
2025-03-09 13:20:27 -04:00
committed by GitHub
parent 63b468927e
commit 0fcf1f6e3a
6 changed files with 134 additions and 2 deletions
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64
src/GBACart.cpp
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@ -539,6 +539,57 @@ CartGameSolarSensor::CartGameSolarSensor(std::unique_ptr<u8[]>&& rom, u32 len, s
{
}
std::unique_ptr<CartGameSolarSensor> CreateFakeSolarSensorROM(const char* gamecode, const NDSCart::CartCommon& cart, void* userdata) noexcept
{
return CreateFakeSolarSensorROM(gamecode, cart.GetHeader().NintendoLogo, userdata);
}
std::unique_ptr<CartGameSolarSensor> CreateFakeSolarSensorROM(const char* gamecode, const GBACart::CartGame& cart, void* userdata) noexcept
{
return CreateFakeSolarSensorROM(gamecode, cart.GetHeader().NintendoLogo, userdata);
}
std::unique_ptr<CartGameSolarSensor> CreateFakeSolarSensorROM(const char* gamecode, const u8* logo, void* userdata) noexcept
{
if (!gamecode)
return nullptr;
if (strnlen(gamecode, sizeof(GBAHeader::GameCode)) > sizeof(GBAHeader::GameCode))
return nullptr;
bool solarsensor = false;
for (const char* i : SOLAR_SENSOR_GAMECODES)
{
if (strcmp(gamecode, i) == 0) {
solarsensor = true;
break;
}
}
if (!solarsensor)
return nullptr;
// just 256 bytes; we don't need a whole ROM!
constexpr size_t FAKE_BOKTAI_ROM_LENGTH = 0x100;
std::unique_ptr<u8[]> rom = std::make_unique<u8[]>(FAKE_BOKTAI_ROM_LENGTH);
// create a fake ROM
GBAHeader& header = *reinterpret_cast<GBAHeader*>(rom.get());
memcpy(header.Title, BOKTAI_STUB_TITLE, strnlen(BOKTAI_STUB_TITLE, sizeof(header.Title)));
memcpy(header.GameCode, gamecode, strnlen(gamecode, sizeof(header.GameCode)));
header.FixedValue = 0x96;
if (logo)
{
memcpy(header.NintendoLogo, logo, sizeof(header.NintendoLogo));
}
else
{
memset(header.NintendoLogo, 0xFF, sizeof(header.NintendoLogo));
}
return std::make_unique<CartGameSolarSensor>(std::move(rom), FAKE_BOKTAI_ROM_LENGTH, nullptr, 0, userdata);
}
const int CartGameSolarSensor::kLuxLevels[11] = {0, 5, 11, 18, 27, 42, 62, 84, 109, 139, 183};
void CartGameSolarSensor::Reset()
@ -843,7 +894,18 @@ std::unique_ptr<CartCommon> LoadAddon(int type, void* userdata)
case GBAAddon_RumblePak:
cart = std::make_unique<CartRumblePak>(userdata);
break;
case GBAAddon_SolarSensorBoktai1:
// US Boktai 1
cart = CreateFakeSolarSensorROM("U3IE", nullptr, userdata);
break;
case GBAAddon_SolarSensorBoktai2:
// US Boktai 2
cart = CreateFakeSolarSensorROM("U32E", nullptr, userdata);
break;
case GBAAddon_SolarSensorBoktai3:
// JP Boktai 3
cart = CreateFakeSolarSensorROM("U33J", nullptr, userdata);
break;
default:
Log(LogLevel::Warn, "GBACart: !! invalid addon type %d\n", type);
return nullptr;