mirror of https://github.com/stella-emu/stella.git
123 lines
4.0 KiB
C++
123 lines
4.0 KiB
C++
//============================================================================
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//
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// SSSS tt lll lll
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// SS SS tt ll ll
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// SS tttttt eeee ll ll aaaa
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// SSSS tt ee ee ll ll aa
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// SS tt eeeeee ll ll aaaaa -- "An Atari 2600 VCS Emulator"
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// SS SS tt ee ll ll aa aa
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// SSSS ttt eeeee llll llll aaaaa
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//
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// Copyright (c) 1995-2017 by Bradford W. Mott, Stephen Anthony
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// and the Stella Team
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//
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// See the file "License.txt" for information on usage and redistribution of
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// this file, and for a DISCLAIMER OF ALL WARRANTIES.
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//============================================================================
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#include "Event.hxx"
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#include "System.hxx"
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#include "TIA.hxx"
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#include "AtariMouse.hxx"
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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AtariMouse::AtariMouse(Jack jack, const Event& event, const System& system)
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: Controller(jack, event, system, Controller::AtariMouse),
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myHCounter(0),
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myVCounter(0),
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myMouseEnabled(false)
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{
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// This code in ::read() is set up to always return IOPortA values in
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// the lower 4 bits data value
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// As such, the jack type (left or right) isn't necessary here
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myTrakBallCountH = myTrakBallCountV = 0;
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myTrakBallLinesH = myTrakBallLinesV = 1;
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myTrakBallLeft = myTrakBallDown = myScanCountV = myScanCountH =
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myCountV = myCountH = 0;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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uInt8 AtariMouse::read()
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{
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int scanline = mySystem.tia().scanlines();
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if(myScanCountV > scanline) myScanCountV = 0;
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if(myScanCountH > scanline) myScanCountH = 0;
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while((myScanCountV + myTrakBallLinesV) < scanline)
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{
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if(myTrakBallCountV)
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{
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if(myTrakBallDown) myCountV--;
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else myCountV++;
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myTrakBallCountV--;
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}
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myScanCountV += myTrakBallLinesV;
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}
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while((myScanCountH + myTrakBallLinesH) < scanline)
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{
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if(myTrakBallCountH)
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{
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if(myTrakBallLeft) myCountH--;
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else myCountH++;
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myTrakBallCountH--;
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}
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myScanCountH += myTrakBallLinesH;
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}
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myCountV &= 0x03;
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myCountH &= 0x03;
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static constexpr uInt32 ourTableH[4] = { 0x00, 0x80, 0xc0, 0x40 };
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static constexpr uInt32 ourTableV[4] = { 0x00, 0x10, 0x30, 0x20 };
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uInt8 IOPortA = ourTableV[myCountV] | ourTableH[myCountH];
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myDigitalPinState[One] = IOPortA & 0x10;
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myDigitalPinState[Two] = IOPortA & 0x20;
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myDigitalPinState[Three] = IOPortA & 0x40;
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myDigitalPinState[Four] = IOPortA & 0x80;
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return (IOPortA >> 4);
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void AtariMouse::update()
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{
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if(!myMouseEnabled)
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return;
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// Get the current mouse position
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myHCounter = myEvent.get(Event::MouseAxisXValue);
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myVCounter = myEvent.get(Event::MouseAxisYValue);
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if(myVCounter < 0) myTrakBallLeft = 1;
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else myTrakBallLeft = 0;
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if(myHCounter < 0) myTrakBallDown = 0;
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else myTrakBallDown = 1;
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myTrakBallCountH = abs(myVCounter >> 1);
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myTrakBallCountV = abs(myHCounter >> 1);
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myTrakBallLinesH = mySystem.tia().height() / (myTrakBallCountH + 1);
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if(myTrakBallLinesH == 0) myTrakBallLinesH = 1;
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myTrakBallLinesV = mySystem.tia().height() / (myTrakBallCountV + 1);
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if(myTrakBallLinesV == 0) myTrakBallLinesV = 1;
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// Get mouse button state
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myDigitalPinState[Six] = (myEvent.get(Event::MouseButtonLeftValue) == 0) &&
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(myEvent.get(Event::MouseButtonRightValue) == 0);
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool AtariMouse::setMouseControl(
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Controller::Type xtype, int xid, Controller::Type ytype, int yid)
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{
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// Currently, the various trakball controllers take full control of the
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// mouse, and use both mouse buttons for the single fire button
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// As well, there's no separate setting for x and y axis, so any
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// combination of Controller and id is valid
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myMouseEnabled = (xtype == myType || ytype == myType) &&
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(xid != -1 || yid != -1);
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return true;
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}
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