reinette-IIe/paddles.cpp
ArthurFerreira2 4c8b396e53
initial commit
first public release
2021-07-07 17:00:47 +02:00

70 lines
4.0 KiB
C++

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