mirror of https://github.com/bsnes-emu/bsnes.git
123 lines
3.0 KiB
C++
123 lines
3.0 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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write_bank = (write_bank + 1) & 3;
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write_addr = 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 = write_addr / 160;
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uint x = write_addr % 160;
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uint addr = write_bank * 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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write_addr = (write_addr + 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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joyp_id = (joyp_id + 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((joyp_packet[0] >> 3) == 0x11) {
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mlt_req = joyp_packet[1] & 3;
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if(mlt_req == 2) mlt_req = 3;
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joyp_id = 0;
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}
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if(packetsize < 64) packet[packetsize++] = joyp_packet;
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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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joyp_packet[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::videoColor(uint source, uint16 red, uint16 green, uint16 blue) -> uint32 {
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return source;
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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(int16 left, int16 right) -> void {
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audio.coprocessor_sample(left, right);
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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 = joyp_id & mlt_req;
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uint data = 0x00;
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switch(joyp_id & mlt_req) {
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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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