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