mirror of https://github.com/bsnes-emu/bsnes.git
108 lines
3.0 KiB
C++
108 lines
3.0 KiB
C++
#include <gba/gba.hpp>
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namespace GameBoyAdvance {
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//Game Boy Player emulation
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#include "serialization.cpp"
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Player player;
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auto Player::power() -> void {
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status.enable = false;
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status.rumble = false;
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status.logoDetected = false;
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status.logoCounter = 0;
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status.packet = 0;
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status.send = 0;
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status.recv = 0;
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}
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auto Player::frame() -> void {
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uint32 hash = Hash::CRC32(ppu.output, 240 * 160 * sizeof(uint32)).value();
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status.logoDetected = (hash == 0x7776eb55);
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if(status.logoDetected) {
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status.enable = true;
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status.logoCounter = (status.logoCounter + 1) % 3;
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status.packet = 0;
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}
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if(!status.enable) return;
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//todo: verify which settings are actually required
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//values were taken from observing GBP-compatible games
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if(!cpu.regs.joybus.settings.sc
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&& !cpu.regs.joybus.settings.sd
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&& !cpu.regs.joybus.settings.si
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&& !cpu.regs.joybus.settings.so
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&& !cpu.regs.joybus.settings.scmode
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&& !cpu.regs.joybus.settings.sdmode
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&& !cpu.regs.joybus.settings.simode
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&& !cpu.regs.joybus.settings.somode
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&& !cpu.regs.joybus.settings.irqenable
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&& !cpu.regs.joybus.settings.mode
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&& !cpu.regs.serial.control.shiftclockselect
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&& !cpu.regs.serial.control.shiftclockfrequency
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&& !cpu.regs.serial.control.transferenablereceive
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&& cpu.regs.serial.control.transferenablesend
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&& cpu.regs.serial.control.startbit
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&& cpu.regs.serial.control.transferlength
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&& cpu.regs.serial.control.irqenable
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) {
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status.packet = (status.packet + 1) % 17;
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switch(status.packet) {
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case 0: status.send = 0x0000494e; break;
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case 1: status.send = 0xb6b1494e; break;
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case 2: status.send = 0xb6b1494e; break;
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case 3: status.send = 0xb6b1544e; break;
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case 4: status.send = 0xabb1544e; break;
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case 5: status.send = 0xabb14e45; break;
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case 6: status.send = 0xb1ba4e45; break;
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case 7: status.send = 0xb1ba4f44; break;
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case 8: status.send = 0xb0bb4f44; break;
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case 9: status.send = 0xb0bb8002; break;
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case 10: status.send = 0x10000010; break;
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case 11: status.send = 0x20000013; break;
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case 12: status.send = 0x30000003; break;
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case 13: status.send = 0x30000003; break;
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case 14: status.send = 0x30000003; break;
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case 15: status.send = 0x30000003; break;
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case 16: status.send = 0x30000003; break;
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}
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cpu.regs.irq.flag |= CPU::Interrupt::Serial;
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}
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}
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auto Player::keyinput() -> maybe<uint16> {
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if(status.logoDetected) {
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switch(status.logoCounter) {
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case 0: return {0x03ff};
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case 1: return {0x03ff};
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case 2: return {0x030f};
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}
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}
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return nothing;
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}
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auto Player::read() -> maybe<uint32> {
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if(status.enable) return status.send;
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return nothing;
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}
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auto Player::write(uint2 addr, uint8 byte) -> void {
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if(!status.enable) return;
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uint shift = addr << 3;
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status.recv &= ~(255 << shift);
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status.recv |= byte << shift;
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if(addr == 3 && status.packet == 15) {
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status.rumble = (status.recv & 0xff) == 0x26; //on = 0x26, off = 0x04
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interface->inputRumble(0, 0, 10, status.rumble);
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}
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}
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}
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