mirror of https://github.com/JorjBauer/aiie.git
58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
#ifndef __APPLEKEYBOARD_H
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#define __APPLEKEYBOARD_H
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#include <stdint.h>
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#include "vmkeyboard.h"
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#include "applemmu.h"
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class AppleKeyboard : public VMKeyboard {
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public:
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AppleKeyboard(AppleMMU *m);
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virtual ~AppleKeyboard();
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virtual void keyDepressed(uint8_t k);
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virtual void keyReleased(uint8_t k);
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virtual void maintainKeyboard(int64_t cycleCount);
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protected:
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bool isVirtualKey(uint8_t kc);
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uint8_t translateKeyWithModifiers(uint8_t k);
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private:
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AppleMMU *mmu;
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bool capsLockEnabled;
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// This is a trade-off. I'm choosing speed over RAM size. If we need
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// to reclaim RAM, we can get some bytes here at the expense of speed.
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// These are flags for whether or not each of the individual keys are
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// down, so that we can repeat appropriately. We're tracking state
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// of all of the keys because of special modifier key situations.
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// It's lazily using 256 bytes instead of whatever 62 we'd actually need.
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bool keysDown[256];
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bool anyKeyIsDown;
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// While one - and only one - key is down, we repeat keypresses
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// after about "534 to 801 milliseconds" (UTA2E, p. 7-15); and then
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// while repeating, we send that keypress (reset keystrobe) about 15
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// times a second (every 66667-ish CPU cycles).
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//
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// startRepeatTimer is the time (in CPU clock cycles) when we will
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// start repeating the key that's currently down (note: rollover
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// happens every 4925 seconds because it's a 32-bit counter, which means
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// that roughly once every 82 minutes it's possible that a key will begin
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// repeating early).
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//
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// keyThatIsRepeating is set to the actual key pressed.
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// repeatTimer is the cpu cycle count at which we would repeat again.
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// (It also has the rollover problem once every 82 minutes.)
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int64_t startRepeatTimer;
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uint8_t keyThatIsRepeating;
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int64_t repeatTimer;
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};
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#endif
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