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Added SDL Joystick support
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@Memotech-Bill
Memotech-Bill committed Apr 13, 2024
1 parent cb75b01 commit 7235800
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Showing 3 changed files with 306 additions and 2 deletions.
2 changes: 1 addition & 1 deletion src/memu/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -280,7 +280,7 @@ elseif("${TARGET}" STREQUAL "SDL")
${CMAKE_CURRENT_LIST_DIR}/dirmap.c
${CMAKE_CURRENT_LIST_DIR}/dirt_unix.c
${CMAKE_CURRENT_LIST_DIR}/dis.c
${CMAKE_CURRENT_LIST_DIR}/joy_lin.c
${CMAKE_CURRENT_LIST_DIR}/joy_sdl.c
${CMAKE_CURRENT_LIST_DIR}/kbd2.c
${CMAKE_CURRENT_LIST_DIR}/main.c
${CMAKE_CURRENT_LIST_DIR}/mem.c
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295 changes: 295 additions & 0 deletions src/memu/joy_sdl.c
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@@ -0,0 +1,295 @@
/*
joy_sdl.c - Joystick via SDL
*/

/*...sincludes:0:*/
#include <stdio.h>
#include <string.h>
#include <SDL2/SDL.h>

#include "types.h"
#include "diag.h"
#include "common.h"
#include "kbd.h"
#include "joy.h"

/*...vtypes\46\h:0:*/
/*...vdiag\46\h:0:*/
/*...vcommon\46\h:0:*/
/*...vkbd\46\h:0:*/
/*...vjoy\46\h:0:*/
/*...e*/

/*...svars:0:*/
static int joy_emu = 0;
static const char *joy_buttons = "<LEFT><RIGHT><UP><DOWN><HOME> ";
static int joy_central = 0; /* Its as if Linux driver is already doing this */

#ifdef HAVE_JOY

#define MAX_JOY 4
static int n_joy = 0;
SDL_Joystick *joy_dev[MAX_JOY];
SDL_JoystickID joy_id[MAX_JOY];
static int joy_fst_axis[MAX_JOY];
static int joy_fst_button[MAX_JOY];
#define MAX_AXES 8
static int joy_n_axes = 0;
static int joy_up_row[MAX_AXES] , joy_up_bitpos[MAX_AXES];
static int joy_down_row[MAX_AXES] , joy_down_bitpos[MAX_AXES];
#define MAX_BUTTONS 16
static int joy_n_buttons = 0;
static int joy_buttons_row[MAX_BUTTONS], joy_buttons_bitpos[MAX_BUTTONS];

#endif
/*...e*/

/*...sjoy_set_buttons:0:*/
void joy_set_buttons(const char *buttons)
{
joy_buttons = buttons;
}
/*...e*/
/*...sjoy_set_central:0:*/
/* Expressed as a percentage */

void joy_set_central(int central)
{
joy_central = central * 32000 / 100;
}
/*...e*/

/*...sjoy_periodic:0:*/
#ifdef HAVE_JOY
/*...sjoy_button:0:*/
#ifdef ALT_KEYPRESS
BOOLEAN ALT_KEYPRESS (int wk);
#endif

static void joy_button(int row, int bitpos, BOOLEAN press)
{
diag_message(DIAG_JOY_USAGE, "joy_button (%d, %d, %d)", row, bitpos, press);
if ( row >= 0 )
{
if ( press )
kbd_grid_press(row, bitpos);
else
kbd_grid_release(row, bitpos);
}
#ifdef ALT_KEYPRESS
else if ( press && ( row == -2 ) )
{
ALT_KEYPRESS (bitpos);
}
#endif
}
/*...e*/
#endif

void joy_periodic(void)
{
}

static int joy_index (SDL_JoystickID id)
{
for (int i = 0; i < n_joy; ++i)
{
if (id == joy_id[i]) return i;
}
return -1;
}

void joy_handle_events (SDL_Event *e)
{
#ifdef HAVE_JOY
int idx;
if ( joy_emu & JOYEMU_JOY )
{
switch (e->type)
{
case SDL_JOYAXISMOTION:
idx = joy_index (e->jaxis.which);
if (idx < 0) break;
int axis = joy_fst_axis[idx] + e->jaxis.axis;
if (axis >= joy_n_axes) break;
joy_button(joy_up_row[axis] , joy_up_bitpos[axis],
e->jaxis.value < -joy_central);
joy_button(joy_down_row[axis] , joy_down_bitpos[axis],
e->jaxis.value > joy_central);
break;
case SDL_JOYBUTTONDOWN:
case SDL_JOYBUTTONUP:
idx = joy_index (e->jbutton.which);
if (idx < 0) break;
int button = joy_fst_button[idx] + e->jbutton.button;
if (button >= joy_n_buttons) break;
joy_button(joy_buttons_row[button], joy_buttons_bitpos[button],
e->jbutton.state == SDL_PRESSED);
break;
}
}
#endif
}
/*...e*/

int joy_int (const char **pps)
{
int iVal = 0;
while ( (**pps >= '0' ) && (**pps <= '9') )
{
iVal = 10 * iVal + (**pps - '0');
++(*pps);
}
return iVal;
}

/*...sjoy_init:0:*/
void joy_init(int emu)
{
#ifdef HAVE_JOY
if ( emu & JOYEMU_JOY )
{
unsigned char axes = 0;
unsigned char buttons = 0;
const char *p;
BOOLEAN shifted;
SDL_InitSubSystem (SDL_INIT_JOYSTICK);
int n_joy = SDL_NumJoysticks ();
if ( n_joy < 1 ) fatal ("No joystick found");
if (n_joy > MAX_JOY) n_joy = MAX_JOY;
for (int i = 0; i < n_joy; ++i)
{
joy_id[i] = SDL_JoystickGetDeviceInstanceID (i);
joy_dev[i] = SDL_JoystickOpen (i);
joy_fst_axis[i] = axes;
joy_fst_button[i] = buttons;
axes += SDL_JoystickNumAxes (joy_dev[i]);
buttons += SDL_JoystickNumButtons (joy_dev[i]);
}
if ( axes < 2 )
{
joy_term ();
fatal("joystick needs to support at least 2 axes");
}
else if ( axes > MAX_AXES )
{
axes = MAX_AXES;
}
if ( buttons < 1 )
{
joy_term ();
fatal("joystick needs to support at least 1 button");
}
diag_message(DIAG_JOY_INIT, "found %d joystick(s) with %d axes and %d buttons",
n_joy, axes, buttons);
for (int i = 0; i < MAX_AXES; ++i)
{
joy_up_row[i] = -1;
joy_down_row[i] = -1;
}
for (int i = 0; i < MAX_BUTTONS; ++i) joy_buttons_row[i] = -1;
p = joy_buttons;
char *buf = NULL;
if ( joy_buttons[0] == '@' )
{
// Configuration from a file
FILE *fp = efopen(&joy_buttons[1], "rb");
fseek(fp, 0, SEEK_END);
size_t length = ftell(fp);
buf = emalloc (length + 1);
fseek(fp, 0, SEEK_SET);
fread(buf, 1, length, fp);
fclose(fp);
buf[length] = '\0';
p = buf;
}
if ( strchr (p, '=') == NULL )
{
// Old style configuration
if ( kbd_find_grid(&p, &joy_up_row[0] , &joy_up_bitpos[0] , &shifted) &&
kbd_find_grid(&p, &joy_down_row[0] , &joy_down_bitpos[0] , &shifted) &&
kbd_find_grid(&p, &joy_up_row[1] , &joy_up_bitpos[1] , &shifted) &&
kbd_find_grid(&p, &joy_down_row[1] , &joy_down_bitpos[1] , &shifted) &&
kbd_find_grid(&p, &joy_buttons_row[0], &joy_buttons_bitpos[0], &shifted) )
;
else
{
joy_term ();
fatal("can't parse joystick buttons: %s", joy_buttons);
}
joy_n_buttons = 1;
while ( *p != '\0' && joy_n_buttons < MAX_BUTTONS && joy_n_buttons < buttons )
{
if ( ! kbd_find_grid(&p, &joy_buttons_row[joy_n_buttons], &joy_buttons_bitpos[joy_n_buttons], &shifted) )
fatal("can't parse joystick extra buttons: \"%s\"", joy_buttons);
++joy_n_buttons;
}
diag_message(DIAG_JOY_INIT, "%d axis central region, %d buttons configured to press keys",
joy_central, joy_n_buttons);
}
else
{
// New style configuration
joy_n_buttons = 1;
while ( *p )
{
if ( *p < ' ' )
{
++p;
}
else if ( *p == 'A' )
{
++p;
int axis = joy_int (&p);
if ( axis >= MAX_AXES ) fatal ("Joystick axis %d more than %d", axis, MAX_AXES);
if ( *p != '=' ) fatal ("Invalid joystick configuration syntax");
++p;
if ( (! kbd_find_grid(&p, &joy_up_row[axis], &joy_up_bitpos[axis], &shifted) ) ||
(! kbd_find_grid(&p, &joy_down_row[axis], &joy_down_bitpos[axis], &shifted) ) )
fatal ("can't parse keys for joystick axis %d", axis);
diag_message(DIAG_JOY_INIT, "Joystick axis %d up: row = %d, bitpos = %d",
axis, joy_up_row[axis], joy_up_bitpos[axis]);
diag_message(DIAG_JOY_INIT, "Joystick axis %d down: row = %d, bitpos = %d",
axis, joy_down_row[axis], joy_down_bitpos[axis]);
if (axis >= joy_n_axes) joy_n_axes = axis + 1;
}
else if ( *p == 'B' )
{
++p;
int btn = joy_int (&p);
if ( btn >= MAX_BUTTONS ) fatal ("Joystick button %d more than %d", btn, MAX_BUTTONS);
if ( *p != '=' ) fatal ("Invalid joystick configuration syntax");
++p;
if ( ! kbd_find_grid(&p, &joy_buttons_row[btn], &joy_buttons_bitpos[btn], &shifted) )
fatal ("can't parse key for joystick button %d", btn);
diag_message(DIAG_JOY_INIT, "Joystick button %d: row = %d, bitpos = %d",
btn, joy_buttons_row[btn], joy_buttons_bitpos[btn]);
if ( btn >= joy_n_buttons ) joy_n_buttons = btn + 1;
}
}
}
}
joy_emu = emu;
#endif
}
/*...e*/
/*...sjoy_term:0:*/
void joy_term(void)
{
#ifdef HAVE_JOY
if ( joy_emu & JOYEMU_JOY )
{
for (int i = 0; i < n_joy; ++i)
{
SDL_JoystickClose (joy_dev[i]);
joy_dev[i] = NULL;
joy_id[i] = -1;
}
n_joy = 0;
}
joy_emu = 0;
#endif
}
/*...e*/
11 changes: 10 additions & 1 deletion src/memu/win_sdl.c
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Original file line number Diff line number Diff line change
Expand Up @@ -286,6 +286,10 @@ static int sdlkey_wk (int keycode)
return 0;
}

#ifdef HAVE_JOY
void joy_handle_events (SDL_Event *e);
#endif

void win_handle_events (void)
{
SDL_Window *sdl_win;
Expand Down Expand Up @@ -315,7 +319,7 @@ void win_handle_events (void)
if (wk > 0) win->keypress ((WIN *) win, wk);
}
break;
case SDL_KEYUP :
case SDL_KEYUP:
if ( e.key.repeat == 0 )
{
sdl_win = SDL_GetWindowFromID (e.key.windowID);
Expand All @@ -325,6 +329,11 @@ void win_handle_events (void)
if (wk > 0) win->keyrelease ((WIN *) win, wk);
}
break;
default:
#ifdef HAVE_JOY
joy_handle_events (&e);
#endif
break;
}
}
}
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