74 lines
1.7 KiB
C++
74 lines
1.7 KiB
C++
/*
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epple2
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Copyright (C) 2008 by Christopher A. Mosher <cmosher01@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY, without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "keyboard.h"
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#include "hypermode.h"
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#include "keyboardbuffermode.h"
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Keyboard::Keyboard(KeypressQueue& q, HyperMode& fhyper, KeyboardBufferMode& buffered):
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keys(q),
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fhyper(fhyper),
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buffered(buffered),
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cGet(0)
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{
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}
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void Keyboard::clear()
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{
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this->latch &= 0x7F;
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}
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unsigned char Keyboard::get()
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{
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waitIfTooFast();
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if (!this->buffered.isBuffered() || !(this->latch & 0x80))
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{
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if (!this->keys.empty())
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{
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this->latch = this->keys.front() | 0x80;
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this->keys.pop();
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}
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}
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return this->latch;
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}
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void Keyboard::waitIfTooFast()
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{
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if (this->fhyper.isHyper())
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{
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return;
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}
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++this->cGet;
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if (!this->cGet)
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{
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if (SDL_GetTicks() - this->lastGet <= 1000)
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{
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/*
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* Check every 256 gets to see if they are
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* happening too fast (within one second).
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* If so, it means we are probably just
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* looping waiting for a keypress, so
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* wait a millisecond (or so) just to
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* prevent us from using 100% of CPU time.
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*/
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SDL_Delay(1);
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}
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}
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this->lastGet = SDL_GetTicks();
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}
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