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apple2ix
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apple2ix/src/joystick.c

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/*
* Apple // emulator for *ix
*
* This software package is subject to the GNU General Public License
* version 3 or later (your choice) as published by the Free Software
* Foundation.
*
* Copyright 1994 Alexander Jean-Claude Bottema
* Copyright 1995 Stephen Lee
* Copyright 1997, 1998 Aaron Culliney
* Copyright 1998, 1999, 2000 Michael Deutschmann
* Copyright 2013-2015 Aaron Culliney
*
*/
#include "common.h"
#ifdef INTERFACE_CLASSIC
#define TEMPSIZE 256
extern void copy_and_pad_string(char *dest, const char* src, const char c, const int len, const char cap);
#endif
joystick_mode_t joy_mode = JOY_MODE_DEFAULT;
/* parameters for generic and keyboard-simulated joysticks */
uint16_t joy_x = HALF_JOY_RANGE;
uint16_t joy_y = HALF_JOY_RANGE;
bool joy_clip_to_radius = false;
#ifdef KEYPAD_JOYSTICK
short joy_step = 1;
bool joy_auto_recenter = false;
#endif
static struct {
video_frame_callback_fn frameCallback;
uint8_t frameCount;
} joystickReset = { 0 };
void (*joydriver_resetJoystick)(void) = NULL;
static void joystick_prefsChanged(const char *domain) {
assert(strcmp(domain, PREF_DOMAIN_JOYSTICK) == 0);
long lVal = 0;
if (prefs_parseLongValue(domain, PREF_JOYSTICK_MODE, &lVal, /*base:*/10)) {
joy_mode = getJoyMode(lVal);
}
prefs_parseBoolValue(domain, PREF_JOYSTICK_CLIP_TO_RADIUS, &joy_clip_to_radius);
#ifdef KEYPAD_JOYSTICK
prefs_parseLongValue(domain, PREF_JOYSTICK_KPAD_STEP, &lVal, /*base:*/10);
joy_step = (short)lVal;
if (joy_step < 1) {
joy_step = 1;
}
if (joy_step > 255) {
joy_step = 255;
}
prefs_parseBoolValue(domain, PREF_JOYSTICK_KPAD_AUTO_RECENTER, &joy_auto_recenter);
#endif
}
static void _init_joystick(void) {
prefs_registerListener(PREF_DOMAIN_JOYSTICK, &joystick_prefsChanged);
video_registerFrameCallback(&joystickReset.frameCallback);
}
static __attribute__((constructor)) void __init_joystick(void) {
emulator_registerStartupCallback(CTOR_PRIORITY_LATE, &_init_joystick);
}
#ifdef INTERFACE_CLASSIC
/* -------------------------------------------------------------------------
c_calibrate_pc_joystick() - calibrates joystick. determines extreme
and center coordinates. assumes that it can write to the interface
screen.
------------------------------------------------------------------------- */
static void c_calibrate_pc_joystick()
{
char temp[TEMPSIZE];
#define CALIBRATE_JOYMENU_H 20
#define CALIBRATE_JOYMENU_W 40
#define CALIBRATE_TURTLE_X0 4
#define CALIBRATE_TURTLE_Y0 3
#define CALIBRATE_TURTLE_STEP_X (30.f / 255.f)
#define CALIBRATE_TURTLE_STEP_Y (10.f / 255.f)
char joymenu[CALIBRATE_JOYMENU_H][CALIBRATE_JOYMENU_W+1] =
//1. 5. 10. 15. 20. 25. 30. 35. 40.
{ "||||||||||||||||||||||||||||||||||||||||",
"| |",
"| ||||||||||||||||||||||||||||||||| |",
"| | | |",
"| | | |",
"| | | |",
"| | | |",
"| | | |",
"| | | |",
"| | | |",
"| | | |",
"| | | |",
"| | | |",
"| | | |",
"| ||||||||||||||||||||||||||||||||| |",
"| |",
"| btn1:@ btn2:@ x:@@@@ y:@@@@ |",
"| |",
"| ESC quits calibration |",
"||||||||||||||||||||||||||||||||||||||||" };
uint8_t x_last=CALIBRATE_JOYMENU_W>>1, y_last=CALIBRATE_JOYMENU_H>>1;
const char* const spinney = "|/-\\";
uint8_t spinney_idx=0;
for (;;)
{
int ch = c_mygetch(0);
int x_plot = CALIBRATE_TURTLE_X0 + (int)(joy_x * CALIBRATE_TURTLE_STEP_X);
int y_plot = CALIBRATE_TURTLE_Y0 + (int)(joy_y * CALIBRATE_TURTLE_STEP_Y);
joymenu[y_last][x_last] = ' ';
joymenu[y_plot][x_plot] = spinney[spinney_idx];
x_last = x_plot;
y_last = y_plot;
joymenu[CALIBRATE_JOYMENU_H-4][8] = run_args.joy_button0 ? 'X' : ' ';
joymenu[CALIBRATE_JOYMENU_H-4][15] = run_args.joy_button1 ? 'X' : ' ';
snprintf(temp, TEMPSIZE, "%04x", (short)(joy_x));
copy_and_pad_string(&joymenu[CALIBRATE_JOYMENU_H-4][24], temp, ' ', 5, ' ');
snprintf(temp, TEMPSIZE, "%04x", (short)(joy_y));
copy_and_pad_string(&joymenu[CALIBRATE_JOYMENU_H-4][32], temp, ' ', 5, ' ');
c_interface_print_submenu_centered(joymenu[0], CALIBRATE_JOYMENU_W, CALIBRATE_JOYMENU_H);
spinney_idx = (spinney_idx+1) % 4;
if (ch == kESC)
{
break;
}
static struct timespec ts = { .tv_sec=0, .tv_nsec=33333333 };
nanosleep(&ts, NULL);
}
}
#ifdef KEYPAD_JOYSTICK
static void c_calibrate_keypad_joystick()
{
#define KEYPAD_SUBMENU_H 20
#define KEYPAD_SUBMENU_W 40
#define CALIBRATE_TURTLE_KP_X0 4
#define CALIBRATE_TURTLE_KP_Y0 5
#define CALIBRATE_TURTLE_KP_STEP_X (14.f / 255.f)
char submenu[KEYPAD_SUBMENU_H][KEYPAD_SUBMENU_W+1] =
//1. 5. 10. 15. 20. 25. 30. 35. 40.
{ "||||||||||||||||||||||||||||||||||||||||",
"| |",
"| Use keypad to test & tune joystick |",
"| |",
"| ||||||||||||||||| [You may need to |",
"| | | enable NumLock] |",
"| | | |",
"| | | |",
"| | | 7 @ 9 |",
"| | | @ 5 @ |",
"| | . | 1 @ 3 |",
"| | | Alt-l Alt-r |",
"| | | |",
"| | | + toggles auto- |",
"| | | recentering: @@@ |",
"| | | < or > to change |",
"| ||||||||||||||||| sensitivity: @@ |",
"| |",
"| Alt btn1:@ Alt btn2:@ x:@@ y:@@ |",
"||||||||||||||||||||||||||||||||||||||||" };
submenu[8][29] = (char)(MOUSETEXT_BEGIN + 0x0b);
submenu[9][27] = (char)(MOUSETEXT_BEGIN + 0x08);
submenu[9][31] = (char)(MOUSETEXT_BEGIN + 0x15);
submenu[10][29] = (char)(MOUSETEXT_BEGIN + 0x0a);
joy_x = HALF_JOY_RANGE;
joy_y = HALF_JOY_RANGE;
int ch = -1;
uint8_t x_last=CALIBRATE_JOYMENU_W>>1, y_last=CALIBRATE_JOYMENU_H>>1;
const char* const spinney = "|/-\\";
uint8_t spinney_idx=0;
char temp[TEMPSIZE];
for (;;)
{
submenu[KEYPAD_SUBMENU_H-2][12] = run_args.joy_button0 ? 'X' : ' ';
submenu[KEYPAD_SUBMENU_H-2][23] = run_args.joy_button1 ? 'X' : ' ';
snprintf(temp, TEMPSIZE, "%02x", (uint8_t)joy_x);
copy_and_pad_string(&submenu[KEYPAD_SUBMENU_H-2][31], temp, ' ', 3, ' ');
snprintf(temp, TEMPSIZE, "%02x", (uint8_t)joy_y);
copy_and_pad_string(&submenu[KEYPAD_SUBMENU_H-2][36], temp, ' ', 3, ' ');
snprintf(temp, TEMPSIZE, "%02x", (uint8_t)joy_step);
copy_and_pad_string(&submenu[KEYPAD_SUBMENU_H-4][36], temp, ' ', 3, ' ');
snprintf(temp, TEMPSIZE, "%s", joy_auto_recenter ? " on" : "off" );
copy_and_pad_string(&submenu[KEYPAD_SUBMENU_H-6][35], temp, ' ', 4, ' ');
int x_plot = CALIBRATE_TURTLE_KP_X0 + (int)(joy_x * CALIBRATE_TURTLE_KP_STEP_X);
int y_plot = CALIBRATE_TURTLE_KP_Y0 + (int)(joy_y * CALIBRATE_TURTLE_STEP_Y);
submenu[y_last][x_last] = ' ';
submenu[y_plot][x_plot] = spinney[spinney_idx];
x_last = x_plot;
y_last = y_plot;
spinney_idx = (spinney_idx+1) % 4;
c_interface_print_submenu_centered(submenu[0], KEYPAD_SUBMENU_W, KEYPAD_SUBMENU_H);
ch = c_mygetch(0);
if (ch == kESC)
{
break;
}
else if (ch == '<')
{
if (joy_step > 1)
{
--joy_step;
}
}
else if (ch == '>')
{
if (joy_step < 0xFF)
{
++joy_step;
}
}
else if (ch == '+')
{
joy_auto_recenter = (joy_auto_recenter+1) % 2;
if (joy_auto_recenter)
{
joy_x = HALF_JOY_RANGE;
joy_y = HALF_JOY_RANGE;
}
}
static struct timespec ts = { .tv_sec=0, .tv_nsec=33333333 };
nanosleep(&ts, NULL);
}
prefs_setLongValue(PREF_DOMAIN_JOYSTICK, PREF_JOYSTICK_KPAD_STEP, joy_step);
prefs_setBoolValue(PREF_DOMAIN_JOYSTICK, PREF_JOYSTICK_KPAD_AUTO_RECENTER, joy_auto_recenter);
}
#endif // KEYPAD_JOYSTICK
void c_calibrate_joystick()
{
if (joy_mode == JOY_PCJOY)
{
c_calibrate_pc_joystick();
}
#ifdef KEYPAD_JOYSTICK
else if (joy_mode == JOY_KPAD)
{
c_calibrate_keypad_joystick();
}
#endif
}
#endif // INTERFACE_CLASSIC
#if !TESTING
// NOTE : reset joystick buttons after a number of frames, which should allow for Open/Closed-Apple reset sequence.
void _joystick_frameCallback(uint8_t textFlashCounter) {
(void)textFlashCounter;
// When activated, this is called every video frame -- ~16.688 millis
ASSERT_ON_CPU_THREAD();
--joystickReset.frameCount;
if (joystickReset.frameCount == 0) {
run_args.joy_button0 = 0x0;
run_args.joy_button1 = 0x0;
joystickReset.frameCallback = NULL; // unlatch
}
}
#endif
void joystick_reset(void) {
if (joydriver_resetJoystick) {
joydriver_resetJoystick();
}
#if TESTING
// For "testdisk" determinism, these need to be reset immediately
run_args.joy_button0 = 0x0;
run_args.joy_button1 = 0x0;
#else
joystickReset.frameCount = 2; // >= 1 full frame of processing insures that reset is handled
joystickReset.frameCallback = &_joystick_frameCallback;
#endif
joy_x = HALF_JOY_RANGE;
joy_y = HALF_JOY_RANGE;
}
// clamps modern gamepad controller axis values to the "corners" of a traditional joystick as used on the Apple //e
static inline void clampBeyondRadius(uint8_t *x, uint8_t *y) {
float half_x = (*x) - HALF_JOY_RANGE;
float half_y = (*y) - HALF_JOY_RANGE;
float r = sqrtf(half_x*half_x + half_y*half_y);
bool shouldClip = (r > HALF_JOY_RANGE);
if (joy_clip_to_radius && shouldClip) {
if ((*x) < HALF_JOY_RANGE) {
(*x) = ((*x) < QUARTER_JOY_RANGE) ? 0.f : (*x);
} else {
(*x) = ((*x) < HALF_JOY_RANGE+QUARTER_JOY_RANGE) ? (*x) : 0xFF;
}
if ((*y) < HALF_JOY_RANGE) {
(*y) = ((*y) < QUARTER_JOY_RANGE) ? 0.f : (*y);
} else {
(*y) = ((*y) < HALF_JOY_RANGE+QUARTER_JOY_RANGE) ? (*y) : JOY_RANGE-1;
}
}
}
void joydriver_setClampBeyondRadius(bool clamp) {
joy_clip_to_radius = clamp;
}
void joydriver_setAxisValue(uint8_t x, uint8_t y) {
clampBeyondRadius(&x, &y);
joy_x = x;
joy_y = y;
}
uint8_t joydriver_getAxisX(void) {
return joy_x;
}
// return Y axis value
uint8_t joydriver_getAxisY(void) {
return joy_y;
}
// set button 0 pressed
void joydriver_setButton0Pressed(bool pressed) {
run_args.joy_button0 = (pressed) ? 0x80 : 0x0;
}
// set button 1 pressed
void joydriver_setButton1Pressed(bool pressed) {
run_args.joy_button1 = (pressed) ? 0x80 : 0x0;
}
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