mirror of https://github.com/bsnes-emu/bsnes.git
130 lines
3.3 KiB
C++
130 lines
3.3 KiB
C++
auto ICD2::lcdScanline() -> void {
|
|
if(GameBoy::ppu.status.ly > 143) return; //Vblank
|
|
if((GameBoy::ppu.status.ly & 7) == 0) {
|
|
writeBank = (writeBank + 1) & 3;
|
|
writeAddress = 0;
|
|
}
|
|
}
|
|
|
|
auto ICD2::lcdOutput(uint2 color) -> void {
|
|
uint y = writeAddress / 160;
|
|
uint x = writeAddress % 160;
|
|
uint addr = writeBank * 512 + y * 2 + x / 8 * 16;
|
|
output[addr + 0] = (output[addr + 0] << 1) | (bool)(color & 1);
|
|
output[addr + 1] = (output[addr + 1] << 1) | (bool)(color & 2);
|
|
writeAddress = (writeAddress + 1) % 1280;
|
|
}
|
|
|
|
auto ICD2::joypWrite(bool p15, bool p14) -> void {
|
|
//joypad handling
|
|
if(p15 == 1 && p14 == 1) {
|
|
if(joyp15Lock == 0 && joyp14Lock == 0) {
|
|
joyp15Lock = 1;
|
|
joyp14Lock = 1;
|
|
joypID = (joypID + 1) & 3;
|
|
}
|
|
}
|
|
|
|
if(p15 == 0 && p14 == 1) joyp15Lock = 0;
|
|
if(p15 == 1 && p14 == 0) joyp14Lock = 0;
|
|
|
|
//packet handling
|
|
if(p15 == 0 && p14 == 0) { //pulse
|
|
pulseLock = false;
|
|
packetOffset = 0;
|
|
bitOffset = 0;
|
|
strobeLock = true;
|
|
packetLock = false;
|
|
return;
|
|
}
|
|
|
|
if(pulseLock) return;
|
|
|
|
if(p15 == 1 && p14 == 1) {
|
|
strobeLock = false;
|
|
return;
|
|
}
|
|
|
|
if(strobeLock) {
|
|
if(p15 == 1 || p14 == 1) { //malformed packet
|
|
packetLock = false;
|
|
pulseLock = true;
|
|
bitOffset = 0;
|
|
packetOffset = 0;
|
|
} else {
|
|
return;
|
|
}
|
|
}
|
|
|
|
//p15:1, p14:0 = 0
|
|
//p15:0, p14:1 = 1
|
|
bool bit = (p15 == 0);
|
|
strobeLock = true;
|
|
|
|
if(packetLock) {
|
|
if(p15 == 1 && p14 == 0) {
|
|
if((joypPacket[0] >> 3) == 0x11) {
|
|
mltReq = joypPacket[1] & 3;
|
|
if(mltReq == 2) mltReq = 3;
|
|
joypID = 0;
|
|
}
|
|
|
|
if(packetSize < 64) packet[packetSize++] = joypPacket;
|
|
packetLock = false;
|
|
pulseLock = true;
|
|
}
|
|
return;
|
|
}
|
|
|
|
bitData = (bit << 7) | (bitData >> 1);
|
|
if(++bitOffset < 8) return;
|
|
|
|
bitOffset = 0;
|
|
joypPacket[packetOffset] = bitData;
|
|
if(++packetOffset < 16) return;
|
|
packetLock = true;
|
|
}
|
|
|
|
auto ICD2::open(uint id, string name, vfs::file::mode mode, bool required) -> vfs::shared::file {
|
|
//redirect system folder to cartridge folder:
|
|
//expects "GameBoy.sys"; but this would be "Super Famicom.sys"; redirect to "Super Game Boy.sfc/"
|
|
if(id == ID::System) id = cartridge.pathID();
|
|
return interface->open(id, name, mode, required);
|
|
}
|
|
|
|
auto ICD2::load(uint id, string name, string type) -> maybe<uint> {
|
|
return interface->load(id, name, type);
|
|
}
|
|
|
|
auto ICD2::videoRefresh(const uint32* data, uint pitch, uint width, uint height) -> void {
|
|
}
|
|
|
|
auto ICD2::audioSample(const double* samples, uint channels) -> void {
|
|
stream->write(samples);
|
|
}
|
|
|
|
auto ICD2::inputPoll(uint port, uint device, uint id) -> int16 {
|
|
GameBoy::cpu.status.mltReq = joypID & mltReq;
|
|
|
|
uint data = 0x00;
|
|
switch(joypID & mltReq) {
|
|
case 0: data = ~r6004; break;
|
|
case 1: data = ~r6005; break;
|
|
case 2: data = ~r6006; break;
|
|
case 3: data = ~r6007; break;
|
|
}
|
|
|
|
switch((GameBoy::Input)id) {
|
|
case GameBoy::Input::Start: return (bool)(data & 0x80);
|
|
case GameBoy::Input::Select: return (bool)(data & 0x40);
|
|
case GameBoy::Input::B: return (bool)(data & 0x20);
|
|
case GameBoy::Input::A: return (bool)(data & 0x10);
|
|
case GameBoy::Input::Down: return (bool)(data & 0x08);
|
|
case GameBoy::Input::Up: return (bool)(data & 0x04);
|
|
case GameBoy::Input::Left: return (bool)(data & 0x02);
|
|
case GameBoy::Input::Right: return (bool)(data & 0x01);
|
|
}
|
|
|
|
return 0;
|
|
}
|