144 lines
2.9 KiB
C#
144 lines
2.9 KiB
C#
using BizHawk.Emulation.Common;
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namespace BizHawk.Emulation.Cores.Intellivision
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{
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public sealed partial class Intellivision : IEmulator
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{
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public IEmulatorServiceProvider ServiceProvider { get; }
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public ControllerDefinition ControllerDefinition => ControllerDeck.Definition;
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public IController Controller { get; set; }
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public void FrameAdvance(bool render, bool rendersound)
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{
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if (_tracer.Enabled)
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{
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_cpu.TraceCallback = (s) => _tracer.Put(s);
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}
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else
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{
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_cpu.TraceCallback = null;
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}
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_frame++;
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_sticRow = -1;
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// read the controller state here for now
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GetControllerState();
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// this timer tracks cycles stolen by the STIC during the visible part of the frame, quite a large number of them actually
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int delay_cycles = 700;
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int delay_timer = -1;
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_cpu.PendingCycles = 14934 - 3791 + _cpu.GetPendingCycles();
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_stic.Sr1 = true;
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_islag = true;
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bool active_display = _stic.active_display;
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// also at the start of every frame the color stack is reset
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_stic.ColorSP = 0x0028;
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while (_cpu.GetPendingCycles() > 0)
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{
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int cycles = _cpu.Execute();
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_psg.generate_sound(cycles);
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if (delay_cycles>=0 && active_display)
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delay_cycles += cycles;
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if (delay_timer> 0 && active_display)
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{
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delay_timer -= cycles;
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if (delay_timer<=0)
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{
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_stic.ToggleSr2();
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delay_cycles = 0;
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}
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}
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if (delay_cycles >= 750 && active_display)
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{
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delay_cycles = -1;
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delay_timer = 110;
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_stic.ToggleSr2();
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if (_sticRow >= 0)
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{
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_stic.in_vb_2 = true;
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_stic.Background(_sticRow);
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_stic.in_vb_2 = false;
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}
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_sticRow++;
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}
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Connect();
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}
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// set up VBlank variables
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_stic.in_vb_1 = true;
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_stic.in_vb_2 = true;
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if (_stic.active_display)
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{
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_stic.Mobs();
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}
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_stic.active_display = false;
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_stic.Sr1 = false;
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_cpu.PendingCycles = 3000 + _cpu.GetPendingCycles();
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while (_cpu.GetPendingCycles() > 0)
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{
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int cycles = _cpu.Execute();
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_psg.generate_sound(cycles);
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Connect();
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}
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// vblank phase 2
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_cpu.PendingCycles = 791 + _cpu.GetPendingCycles();
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_stic.in_vb_1 = false;
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while (_cpu.GetPendingCycles() > 0)
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{
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int cycles = _cpu.Execute();
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_psg.generate_sound(cycles);
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Connect();
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}
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_stic.in_vb_2 = false;
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if (_islag)
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_lagcount++;
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if (Controller.IsPressed("Power"))
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HardReset();
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if (Controller.IsPressed("Reset"))
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SoftReset();
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}
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public int Frame => _frame;
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public string SystemId => "INTV";
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public bool DeterministicEmulation => true;
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[FeatureNotImplemented]
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public string BoardName => null;
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public void ResetCounters()
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{
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_frame = 0;
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_lagcount = 0;
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}
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public CoreComm CoreComm { get; }
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public void Dispose()
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{
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}
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}
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}
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