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71 lines
1.7 KiB
C++
71 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 "videostaticgenerator.h"
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#include "analogtv.h"
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#include "e2const.h"
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#include <ctime>
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#include <cstdlib>
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VideoStaticGenerator::VideoStaticGenerator(AnalogTV& display):
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display(display),
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isig(sig),
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isiglim(sig+AppleNTSC::SIGNAL_LEN),
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hpos(0)
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{
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this->display.signal = sig;
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srand(time(0));
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}
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VideoStaticGenerator::~VideoStaticGenerator()
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{
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}
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void VideoStaticGenerator::tick()
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{
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signed char* is = this->isig;
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unsigned int cycles = E2Const::CRYSTAL_CYCLES_PER_CPU_CYCLE;
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if (this->hpos == E2Const::HORIZ_CYCLES-1)
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{
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cycles += E2Const::EXTRA_CRYSTAL_CYCLES_PER_CPU_LONG_CYCLE;
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}
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for (unsigned int i = 0; i < cycles; ++i)
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{
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*is++ = (rand()>>7&0x7F)-27;
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}
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this->isig = is;
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++this->hpos;
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if (this->hpos >= E2Const::HORIZ_CYCLES)
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{
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this->hpos = 0;
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if (isig >= isiglim)
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{
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isig = sig;
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this->display.drawCurrent();
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}
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}
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}
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void VideoStaticGenerator::powerOn()
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{
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this->hpos = 0;
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this->display.signal = sig;
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isig = sig;
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}
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