70 lines
4.0 KiB
C++
70 lines
4.0 KiB
C++
/*
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* reinette, a french Apple II emulator, using SDL2
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* and powered by puce65c02 - a WDS 65c02 cpu emulator by the same author
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* Last modified 1st of July 2021
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* Copyright (c) 2021 Arthur Ferreira (arthur.ferreira2@gmail.com)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "reinette.h"
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Paddles::Paddles() {
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PB0 = 0; // $C061 Push Button 0 (bit 7) / Open Apple
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PB1 = 0; // $C062 Push Button 1 (bit 7) / Solid Apple
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PB2 = 0; // $C063 Push Button 2 (bit 7) / shift mod !!!
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GCActionSpeed = 8; // Game Controller speed at which it goes to the edges
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GCReleaseSpeed = 8; // Game Controller speed at which it returns to center
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GCCrigger = 0; // $C070 the tick at which the GCs were reseted
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}
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void Paddles::reset() {
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GCC[0] = GCP[0] * GCP[0]; // initialize the countdown for both paddles
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GCC[1] = GCP[1] * GCP[1]; // to the square of their actuall values (positions)
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GCC[2] = GCP[2] * GCP[2]; // to the square of their actuall values (positions)
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GCC[3] = GCP[3] * GCP[3]; // to the square of their actuall values (positions)
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GCCrigger = cpu->ticks; // records the time this was done
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}
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uint8_t Paddles::read(int pdl) {
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const float GCFreq = 6.6; // the speed at which the GC values decrease
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GCC[pdl] -= (cpu->ticks - GCCrigger) / GCFreq; // decreases the countdown
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if (GCC[pdl] <= 0) // timeout
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return GCC[pdl] = 0; // returns 0
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return 0x80; // not timeout, return something with the MSB set
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}
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void Paddles::update() {
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for (int pdl = 0; pdl < 4; pdl++) { // update the two paddles positions
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if (GCA[pdl]) { // actively pushing the stick
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GCP[pdl] += GCD[pdl] * GCActionSpeed;
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if (GCP[pdl] > 255) GCP[pdl] = 255;
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if (GCP[pdl] < 0) GCP[pdl] = 0;
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} else { // the stick returns back to center
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GCP[pdl] += GCD[pdl] * GCReleaseSpeed;
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if (GCD[pdl] == 1 && GCP[pdl] > 127) GCP[pdl] = 127;
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if (GCD[pdl] == -1 && GCP[pdl] < 127) GCP[pdl] = 127;
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}
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}
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}
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