src/joystick/mint/SDL_sysjoystick.c

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#ifdef SDL_JOYSTICK_MINT

/*
 *	Atari Joystick/Joypad drivers
 *
 *	Patrice Mandin
 */

#include <mint/cookie.h>
#include <mint/osbind.h>

#include "SDL_events.h"
#include "../SDL_sysjoystick.h"
#include "../SDL_joystick_c.h"

#include "../../video/ataricommon/SDL_ikbdinterrupt_s.h"
#include "../../video/ataricommon/SDL_xbiosevents_c.h"
#include "../../video/ataricommon/SDL_xbiosinterrupt_s.h"

/*--- Const ---*/

/* We can have:
	1 joystick on IKBD port 1, read via hardware I/O
	  or same joystick on IKBD port 1, read via xbios
	1 joypad on port A (up to 4 with teamtap)
	  or 2 joysticks on joypad port A
	  or 1 analog paddle on joypad port A
	  or 1 lightpen on joypad port A
	1 joypad on port B (up to 4 with teamtap)
	  or 2 joysticks on joypad port B
	  or 1 analog paddle on joypad port B
	2 joysticks on parallel port
*/

enum
{
    IKBD_JOY1 = 0,
    XBIOS_JOY1,
    PORTA_PAD0,
    PORTA_PAD1,
    PORTA_PAD2,
    PORTA_PAD3,
    PORTB_PAD0,
    PORTB_PAD1,
    PORTB_PAD2,
    PORTB_PAD3,
    PORTA_JOY0,
    PORTA_JOY1,
    PORTB_JOY0,
    PORTB_JOY1,
    PORTA_LP,
    PORTA_ANPAD,
    PORTB_ANPAD,
#if 0
    PARA_JOY0,
    PARA_JOY1,
#endif
    MAX_JOYSTICKS
};

enum
{
    MCH_ST = 0,
    MCH_STE,
    MCH_TT,
    MCH_F30,
    MCH_CLONE,
    MCH_ARANYM
};

/*	Joypad buttons
 *		Procontroller note:
 *			L,R are connected to 4,6
 *			X,Y,Z are connected to 7,8,9
 */

enum
{
    JP_UP = 0, JP_DOWN, JP_LEFT, JP_RIGHT,
    JP_KPMULT, JP_KP7, JP_KP4, JP_KP1,
    JP_KP0, JP_KP8, JP_KP5, JP_KP2,
    JP_KPNUM, JP_KP9, JP_KP6, JP_KP3,
    JP_PAUSE, JP_FIRE0, JP_UNDEF0, JP_FIRE1,
    JP_UNDEF1, JP_FIRE2, JP_UNDEF2, JP_OPTION
};

#define JP_NUM_BUTTONS 17

#define PORT_JS_RIGHT	(1<<0)
#define PORT_JS_LEFT	(1<<1)
#define PORT_JS_DOWN	(1<<2)
#define PORT_JS_UP		(1<<3)
#define PORT_JS_FIRE	(1<<4)

/*--- Types ---*/

typedef struct
{
    SDL_bool enabled;
    unsigned char *name;
    Uint32 prevstate;
} atarijoy_t;

/*--- Variables ---*/

static atarijoy_t atarijoysticks[MAX_JOYSTICKS] = {
    {SDL_FALSE, "IKBD joystick port 1", 0},
    {SDL_FALSE, "Xbios joystick port 1", 0},
    {SDL_FALSE, "Joypad 0 port A", 0},
    {SDL_FALSE, "Joypad 1 port A", 0},
    {SDL_FALSE, "Joypad 2 port A", 0},
    {SDL_FALSE, "Joypad 3 port A", 0},
    {SDL_FALSE, "Joypad 0 port B", 0},
    {SDL_FALSE, "Joypad 1 port B", 0},
    {SDL_FALSE, "Joypad 2 port B", 0},
    {SDL_FALSE, "Joypad 3 port B", 0},
    {SDL_FALSE, "Joystick 0 port A", 0},
    {SDL_FALSE, "Joystick 1 port A", 0},
    {SDL_FALSE, "Joystick 0 port B", 0},
    {SDL_FALSE, "Joystick 1 port B", 0},
    {SDL_FALSE, "Lightpen port A", 0},
    {SDL_FALSE, "Analog paddle port A", 0},
    {SDL_FALSE, "Analog paddle port B", 0}
#if 0
    , {SDL_FALSE, "Joystick 0 parallel port", 0},
    {SDL_FALSE, "Joystick 1 parallel port", 0}
#endif
};

static const int jp_buttons[JP_NUM_BUTTONS] = {
    JP_FIRE0, JP_FIRE1, JP_FIRE2, JP_PAUSE,
    JP_OPTION, JP_KPMULT, JP_KPNUM, JP_KP0,
    JP_KP1, JP_KP2, JP_KP3, JP_KP4,
    JP_KP5, JP_KP6, JP_KP7, JP_KP8,
    JP_KP9
};

static SDL_bool joypad_ports_enabled = SDL_FALSE;

/* Updated joypad ports */
static Uint16 jp_paddles[4];
static Uint16 jp_lightpens[2];
static Uint16 jp_directions;
static Uint16 jp_fires;
static Uint32 jp_joypads[8];

/*--- Functions prototypes ---*/

static int GetEnabledAtariJoystick(int index);
static void UpdateJoypads(void);

/*--- Functions ---*/

int
SDL_SYS_JoystickInit(void)
{
    int i;
    unsigned long cookie_mch;
    const char *envr = SDL_getenv("SDL_JOYSTICK_ATARI");

#define TEST_JOY_ENABLED(env,idstring,num) \
	if (SDL_strstr(env,idstring"-off")) { \
		atarijoysticks[num].enabled=SDL_FALSE; \
	} \
	if (SDL_strstr(env,idstring"-on")) { \
		atarijoysticks[num].enabled=SDL_TRUE; \
	}

    /* Cookie _MCH present ? if not, assume ST machine */
    if (Getcookie(C__MCH, &cookie_mch) != C_FOUND) {
        cookie_mch = MCH_ST << 16;
    }

    /* Enable some default joysticks */
    if ((cookie_mch == MCH_ST << 16) || ((cookie_mch >> 16) == MCH_STE) ||
        (cookie_mch == MCH_TT << 16) || (cookie_mch == MCH_F30 << 16) ||
        (cookie_mch == MCH_ARANYM << 16)) {
        atarijoysticks[IKBD_JOY1].enabled = (SDL_AtariIkbd_enabled != 0);
    }
    if ((cookie_mch == MCH_STE << 16) || (cookie_mch == MCH_F30 << 16)) {
        atarijoysticks[PORTA_PAD0].enabled =
            atarijoysticks[PORTA_PAD1].enabled =
            atarijoysticks[PORTA_PAD2].enabled =
            atarijoysticks[PORTA_PAD3].enabled =
            atarijoysticks[PORTB_PAD0].enabled =
            atarijoysticks[PORTB_PAD1].enabled =
            atarijoysticks[PORTB_PAD2].enabled =
            atarijoysticks[PORTB_PAD3].enabled = SDL_TRUE;
    }
    if (!atarijoysticks[IKBD_JOY1].enabled) {
        atarijoysticks[XBIOS_JOY1].enabled = (SDL_AtariXbios_enabled != 0);
    }

    /* Read environment for joysticks to enable */
    if (envr) {
        /* IKBD on any Atari, maybe clones */
        if ((cookie_mch == MCH_ST << 16) || ((cookie_mch >> 16) == MCH_STE)
            || (cookie_mch == MCH_TT << 16) || (cookie_mch == MCH_F30 << 16)
            || (cookie_mch == MCH_ARANYM << 16)) {
            if (SDL_AtariIkbd_enabled != 0) {
                TEST_JOY_ENABLED(envr, "ikbd-joy1", IKBD_JOY1);
            }
        }
        /* Joypads ports only on STE and Falcon */
        if ((cookie_mch == MCH_STE << 16) || (cookie_mch == MCH_F30 << 16)) {
            TEST_JOY_ENABLED(envr, "porta-pad", PORTA_PAD0);
            if (!atarijoysticks[PORTA_PAD0].enabled) {
                TEST_JOY_ENABLED(envr, "porta-joy0", PORTA_JOY0);
                TEST_JOY_ENABLED(envr, "porta-joy1", PORTA_JOY1);
                if (!(atarijoysticks[PORTA_JOY0].enabled)
                    && !(atarijoysticks[PORTA_JOY1].enabled)) {
                    TEST_JOY_ENABLED(envr, "porta-lp", PORTA_LP);
                    if (!atarijoysticks[PORTA_LP].enabled) {
                        TEST_JOY_ENABLED(envr, "porta-anpad", PORTA_ANPAD);
                    }
                }
            }

            TEST_JOY_ENABLED(envr, "portb-pad", PORTB_PAD0);
            if (!atarijoysticks[PORTB_PAD0].enabled) {
                TEST_JOY_ENABLED(envr, "portb-joy0", PORTB_JOY0);
                TEST_JOY_ENABLED(envr, "portb-joy1", PORTB_JOY1);
                if (!(atarijoysticks[PORTB_JOY0].enabled)
                    && !(atarijoysticks[PORTB_JOY1].enabled)) {
                    TEST_JOY_ENABLED(envr, "portb-anpad", PORTB_ANPAD);
                }
            }
        }

        if (!atarijoysticks[IKBD_JOY1].enabled) {
            if (SDL_AtariXbios_enabled != 0) {
                TEST_JOY_ENABLED(envr, "xbios-joy1", XBIOS_JOY1);
            }
        }
#if 0
        /* Parallel port on any Atari, maybe clones */
        if ((cookie_mch == MCH_ST << 16) || ((cookie_mch >> 16) == MCH_STE)
            || (cookie_mch == MCH_TT << 16)
            || (cookie_mch == MCH_F30 << 16)) {
            TEST_JOY_ENABLED(envr, "para-joy0", PARA_JOY0);
            TEST_JOY_ENABLED(envr, "para-joy1", PARA_JOY1);
        }
#endif
    }

    /* Need to update joypad ports ? */
    joypad_ports_enabled = SDL_FALSE;
    for (i = PORTA_PAD0; i <= PORTB_ANPAD; i++) {
        if (atarijoysticks[i].enabled) {
            joypad_ports_enabled = SDL_TRUE;
            break;
        }
    }

    SDL_numjoysticks = 0;
    for (i = 0; i < MAX_JOYSTICKS; i++) {
        if (atarijoysticks[i].enabled) {
            ++SDL_numjoysticks;
        }
    }

    return (SDL_numjoysticks);
}

static int
GetEnabledAtariJoystick(int index)
{
    int i, j;

    /* Return the nth'index' enabled atari joystick */
    j = 0;
    for (i = 0; i < MAX_JOYSTICKS; i++) {
        if (!atarijoysticks[i].enabled) {
            continue;
        }

        if (j == index) {
            break;
        }

        ++j;
    }
    if (i == MAX_JOYSTICKS)
        return -1;

    return i;
}

const char *
SDL_SYS_JoystickName(int index)
{
    int numjoystick;

    numjoystick = GetEnabledAtariJoystick(index);
    if (numjoystick == -1)
        return NULL;

    return (atarijoysticks[numjoystick].name);
}

int
SDL_SYS_JoystickOpen(SDL_Joystick * joystick)
{
    int numjoystick;

    numjoystick = GetEnabledAtariJoystick(joystick->index);
    if (numjoystick == -1)
        return -1;

    joystick->naxes = 0;
    joystick->nhats = 0;
    joystick->nballs = 0;

    switch (numjoystick) {
    case PORTA_PAD0:
    case PORTA_PAD1:
    case PORTA_PAD2:
    case PORTA_PAD3:
    case PORTB_PAD0:
    case PORTB_PAD1:
    case PORTB_PAD2:
    case PORTB_PAD3:
        joystick->nhats = 1;
        joystick->nbuttons = JP_NUM_BUTTONS;
        break;
    case PORTA_LP:
    case PORTA_ANPAD:
    case PORTB_ANPAD:
        joystick->naxes = 2;
        joystick->nbuttons = 2;
        break;
    default:
        joystick->nhats = 1;
        joystick->nbuttons = 1;
        break;
    }

    return (0);
}

void
SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
{
    int numjoystick;
    Uint8 hatstate;
    Uint32 curstate, prevstate;

    numjoystick = GetEnabledAtariJoystick(joystick->index);
    if (numjoystick == -1)
        return;

    prevstate = atarijoysticks[numjoystick].prevstate;

    if (joypad_ports_enabled) {
        Supexec(UpdateJoypads);
    }

    switch (numjoystick) {
    case IKBD_JOY1:
    case XBIOS_JOY1:
        {
            curstate = 0;

            if (numjoystick == IKBD_JOY1) {
                curstate = SDL_AtariIkbd_joystick & 0xff;
            }
            if (numjoystick == XBIOS_JOY1) {
                curstate = SDL_AtariXbios_joystick & 0xff;
            }

            if (curstate != prevstate) {
                hatstate = SDL_HAT_CENTERED;
                if (curstate & IKBD_JOY_LEFT) {
                    hatstate |= SDL_HAT_LEFT;
                }
                if (curstate & IKBD_JOY_RIGHT) {
                    hatstate |= SDL_HAT_RIGHT;
                }
                if (curstate & IKBD_JOY_UP) {
                    hatstate |= SDL_HAT_UP;
                }
                if (curstate & IKBD_JOY_DOWN) {
                    hatstate |= SDL_HAT_DOWN;
                }
                SDL_PrivateJoystickHat(joystick, 0, hatstate);

                /* Button */
                if ((curstate & IKBD_JOY_FIRE)
                    && !(prevstate & IKBD_JOY_FIRE)) {
                    SDL_PrivateJoystickButton(joystick, 0, SDL_PRESSED);
                }
                if (!(curstate & IKBD_JOY_FIRE)
                    && (prevstate & IKBD_JOY_FIRE)) {
                    SDL_PrivateJoystickButton(joystick, 0, SDL_RELEASED);
                }
            }
            atarijoysticks[numjoystick].prevstate = curstate;
        }
        break;
    case PORTA_PAD0:
    case PORTA_PAD1:
    case PORTA_PAD2:
    case PORTA_PAD3:
    case PORTB_PAD0:
    case PORTB_PAD1:
    case PORTB_PAD2:
    case PORTB_PAD3:
        {
            int numjoypad, i;

            numjoypad = 0;
            switch (numjoystick) {
            case PORTA_PAD0:
                numjoypad = 0;
                break;
            case PORTA_PAD1:
                numjoypad = 1;
                break;
            case PORTA_PAD2:
                numjoypad = 2;
                break;
            case PORTA_PAD3:
                numjoypad = 3;
                break;
            case PORTB_PAD0:
                numjoypad = 4;
                break;
            case PORTB_PAD1:
                numjoypad = 5;
                break;
            case PORTB_PAD2:
                numjoypad = 6;
                break;
            case PORTB_PAD3:
                numjoypad = 7;
                break;
            }

            curstate = jp_joypads[numjoypad];
            if (curstate != prevstate) {
                hatstate = SDL_HAT_CENTERED;
                if (curstate & (1 << JP_LEFT)) {
                    hatstate |= SDL_HAT_LEFT;
                }
                if (curstate & (1 << JP_RIGHT)) {
                    hatstate |= SDL_HAT_RIGHT;
                }
                if (curstate & (1 << JP_UP)) {
                    hatstate |= SDL_HAT_UP;
                }
                if (curstate & (1 << JP_DOWN)) {
                    hatstate |= SDL_HAT_DOWN;
                }
                SDL_PrivateJoystickHat(joystick, 0, hatstate);

                /* Buttons */
                for (i = 0; i < JP_NUM_BUTTONS; i++) {
                    int button;

                    button = 1 << jp_buttons[i];

                    if ((curstate & button) && !(prevstate & button)) {
                        SDL_PrivateJoystickButton(joystick, i, SDL_PRESSED);
                    }
                    if (!(curstate & button) && (prevstate & button)) {
                        SDL_PrivateJoystickButton(joystick, i, SDL_RELEASED);
                    }
                }
            }
            atarijoysticks[numjoystick].prevstate = curstate;
        }
        break;
    case PORTA_JOY0:
    case PORTA_JOY1:
    case PORTB_JOY0:
    case PORTB_JOY1:
        {
            int fire_shift = 0, dir_shift = 0;

            if (numjoystick == PORTA_JOY0) {
                fire_shift = 0;
                dir_shift = 0;
            }
            if (numjoystick == PORTA_JOY1) {
                fire_shift = 1;
                dir_shift = 4;
            }
            if (numjoystick == PORTB_JOY0) {
                fire_shift = 2;
                dir_shift = 8;
            }
            if (numjoystick == PORTB_JOY1) {
                fire_shift = 3;
                dir_shift = 12;
            }

            curstate = (jp_directions >> dir_shift) & 15;
            curstate |= ((jp_fires >> fire_shift) & 1) << 4;

            if (curstate != prevstate) {
                hatstate = SDL_HAT_CENTERED;
                if (curstate & PORT_JS_LEFT) {
                    hatstate |= SDL_HAT_LEFT;
                }
                if (curstate & PORT_JS_RIGHT) {
                    hatstate |= SDL_HAT_RIGHT;
                }
                if (curstate & PORT_JS_UP) {
                    hatstate |= SDL_HAT_UP;
                }
                if (curstate & PORT_JS_DOWN) {
                    hatstate |= SDL_HAT_DOWN;
                }
                SDL_PrivateJoystickHat(joystick, 0, hatstate);

                /* Button */
                if ((curstate & PORT_JS_FIRE)
                    && !(prevstate & PORT_JS_FIRE)) {
                    SDL_PrivateJoystickButton(joystick, 0, SDL_PRESSED);
                }
                if (!(curstate & PORT_JS_FIRE)
                    && (prevstate & PORT_JS_FIRE)) {
                    SDL_PrivateJoystickButton(joystick, 0, SDL_RELEASED);
                }
            }
            atarijoysticks[numjoystick].prevstate = curstate;
        }
        break;
    case PORTA_LP:
        {
            int i;

            curstate = jp_lightpens[0] >> 1;
            curstate |= (jp_lightpens[1] >> 1) << 15;
            curstate |= (jp_fires & 3) << 30;

            if (curstate != prevstate) {
                /* X axis */
                SDL_PrivateJoystickAxis(joystick, 0,
                                        jp_lightpens[0] ^ 0x8000);
                /* Y axis */
                SDL_PrivateJoystickAxis(joystick, 1,
                                        jp_lightpens[1] ^ 0x8000);
                /* Buttons */
                for (i = 0; i < 2; i++) {
                    int button;

                    button = 1 << (30 + i);

                    if ((curstate & button) && !(prevstate & button)) {
                        SDL_PrivateJoystickButton(joystick, i, SDL_PRESSED);
                    }
                    if (!(curstate & button) && (prevstate & button)) {
                        SDL_PrivateJoystickButton(joystick, i, SDL_RELEASED);
                    }
                }
            }
            atarijoysticks[numjoystick].prevstate = curstate;
        }
        break;
    case PORTA_ANPAD:
    case PORTB_ANPAD:
        {
            int numpaddle, i;

            numpaddle = 0 << 1;
            if (numjoystick == PORTB_ANPAD)
                numpaddle = 1 << 1;

            curstate = jp_paddles[numpaddle] >> 1;
            curstate |= (jp_paddles[numpaddle + 1] >> 1) << 15;
            curstate |= ((jp_fires >> numpaddle) & 3) << 30;

            if (curstate != prevstate) {
                /* X axis */
                SDL_PrivateJoystickAxis(joystick, 0,
                                        jp_paddles[numpaddle] ^ 0x8000);
                /* Y axis */
                SDL_PrivateJoystickAxis(joystick, 1,
                                        jp_paddles[numpaddle + 1] ^ 0x8000);
                /* Buttons */
                for (i = 0; i < 2; i++) {
                    int button;

                    button = 1 << (30 + i);

                    if ((curstate & button) && !(prevstate & button)) {
                        SDL_PrivateJoystickButton(joystick, i, SDL_PRESSED);
                    }
                    if (!(curstate & button) && (prevstate & button)) {
                        SDL_PrivateJoystickButton(joystick, i, SDL_RELEASED);
                    }
                }
            }
            atarijoysticks[numjoystick].prevstate = curstate;
        }
        break;
#if 0
    case PARA_JOY0:
    case PARA_JOY1:
        break;
#endif
    };

    return;
}

void
SDL_SYS_JoystickClose(SDL_Joystick * joystick)
{
    return;
}

void
SDL_SYS_JoystickQuit(void)
{
    SDL_numjoysticks = 0;
    return;
}

/*--- Joypad I/O read/write interface ---*/

#define JOYPAD_IO_BASE (0xffff9200)
struct JOYPAD_IO_S
{
    Uint16 fires;
    Uint16 directions;
    Uint16 dummy1[6];
    Uint16 paddles[4];
    Uint16 dummy2[4];
    Uint16 lightpens[2];
};
#define JOYPAD_IO ((*(volatile struct JOYPAD_IO_S *)JOYPAD_IO_BASE))

static const Uint16 joypad_masks[8 * 4] = {
    0xfffe, 0xfffd, 0xfffb, 0xfff7,
    0xfff0, 0xfff1, 0xfff2, 0xfff3,
    0xfff4, 0xfff5, 0xfff6, 0xfff8,
    0xfff9, 0xfffa, 0xfffc, 0xffff,
    0xffef, 0xffdf, 0xffbf, 0xff7f,
    0xff0f, 0xff1f, 0xff2f, 0xff3f,
    0xff4f, 0xff5f, 0xff6f, 0xff8f,
    0xff9f, 0xffaf, 0xffcf, 0xffff
};

static void
UpdateJoypads(void)
{
    Uint16 tmp;

        /*--- This function is called in supervisor mode ---*/

    /* Update joysticks */
    jp_fires = (~(JOYPAD_IO.fires)) & 15;
    jp_directions = (~(JOYPAD_IO.directions));

    /* Update lightpen */
    tmp = JOYPAD_IO.lightpens[0] & 1023;
    jp_lightpens[0] = (tmp << 6) | (tmp >> 4);
    tmp = JOYPAD_IO.lightpens[1] & 1023;
    jp_lightpens[1] = (tmp << 6) | (tmp >> 4);

    /* Update paddles */
    tmp = (JOYPAD_IO.paddles[0] & 255);
    jp_paddles[0] = (tmp << 8) | tmp;
    tmp = (JOYPAD_IO.paddles[1] & 255);
    jp_paddles[1] = (tmp << 8) | tmp;
    tmp = (JOYPAD_IO.paddles[2] & 255);
    jp_paddles[2] = (tmp << 8) | tmp;
    tmp = (JOYPAD_IO.paddles[3] & 255);
    jp_paddles[3] = (tmp << 8) | tmp;

    /* Update joypads on teamtap port A */
    for (i = 0; i < 4; i++) {
        jp_joypads[i] = 0;
        for (j = 0; j < 4; j++) {
            JOYPAD_IO.directions = joypad_masks[(i * 4) + j];

            cur_fire = (~(JOYPAD_IO.fires) & 3) << 16;
            cur_dir = (~(JOYPAD_IO.directions) >> 8) & 15;

            jp_joypads[i] |= cur_fire << (j * 2);
            jp_joypads[i] |= cur_dir << (j * 4);
        }
    }

    /* Update joypads on teamtap port B */
    for (i = 4; i < 8; i++) {
        jp_joypads[i] = 0;
        for (j = 0; j < 4; j++) {
            JOYPAD_IO.directions = joypad_masks[(i * 4) + j];

            cur_fire = (~(JOYPAD_IO.fires) & 0xc) << 14;
            cur_dir = (~(JOYPAD_IO.directions) >> 12) & 15;

            jp_joypads[i] |= cur_fire << (j * 2);
            jp_joypads[i] |= cur_dir << (j * 4);
        }
    }

    JOYPAD_IO.directions = 0xffff;
}

#endif /* SDL_JOYSTICK_MINT */
/* vi: set ts=4 sw=4 expandtab: */