src/joystick/SDL_joystick.c
author Ryan C. Gordon <icculus@icculus.org>
Wed, 24 Dec 2014 22:22:35 -0500
changeset 9289 5f857c00d25d
parent 8920 21ccd40c778a
child 9433 bd062398b648
permissions -rw-r--r--
Maybe actually patched to compile this time?
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../SDL_internal.h"
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/* This is the joystick API for Simple DirectMedia Layer */
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#include "SDL.h"
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#include "SDL_events.h"
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#include "SDL_sysjoystick.h"
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#include "SDL_assert.h"
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#include "SDL_hints.h"
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#if !SDL_EVENTS_DISABLED
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#include "../events/SDL_events_c.h"
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#endif
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static SDL_bool SDL_joystick_allows_background_events = SDL_FALSE;
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static SDL_Joystick *SDL_joysticks = NULL;
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static SDL_Joystick *SDL_updating_joystick = NULL;
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static void
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SDL_JoystickAllowBackgroundEventsChanged(void *userdata, const char *name, const char *oldValue, const char *hint)
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{
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    if (hint && *hint == '1') {
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        SDL_joystick_allows_background_events = SDL_TRUE;
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    } else {
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        SDL_joystick_allows_background_events = SDL_FALSE;
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    }
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}
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int
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SDL_JoystickInit(void)
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{
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    int status;
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    /* See if we should allow joystick events while in the background */
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    SDL_AddHintCallback(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS,
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                        SDL_JoystickAllowBackgroundEventsChanged, NULL);
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#if !SDL_EVENTS_DISABLED
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    if (SDL_InitSubSystem(SDL_INIT_EVENTS) < 0) {
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        return -1;
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    }
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#endif /* !SDL_EVENTS_DISABLED */
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    status = SDL_SYS_JoystickInit();
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    if (status >= 0) {
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        status = 0;
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    }
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    return (status);
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}
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/*
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 * Count the number of joysticks attached to the system
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 */
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int
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SDL_NumJoysticks(void)
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{
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    return SDL_SYS_NumJoysticks();
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}
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/*
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 * Get the implementation dependent name of a joystick
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 */
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const char *
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SDL_JoystickNameForIndex(int device_index)
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{
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    if ((device_index < 0) || (device_index >= SDL_NumJoysticks())) {
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        SDL_SetError("There are %d joysticks available", SDL_NumJoysticks());
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        return (NULL);
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    }
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    return (SDL_SYS_JoystickNameForDeviceIndex(device_index));
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}
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/*
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 * Open a joystick for use - the index passed as an argument refers to
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 * the N'th joystick on the system.  This index is the value which will
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 * identify this joystick in future joystick events.
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 *
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 * This function returns a joystick identifier, or NULL if an error occurred.
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 */
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SDL_Joystick *
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SDL_JoystickOpen(int device_index)
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{
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    SDL_Joystick *joystick;
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    SDL_Joystick *joysticklist;
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    const char *joystickname = NULL;
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    if ((device_index < 0) || (device_index >= SDL_NumJoysticks())) {
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        SDL_SetError("There are %d joysticks available", SDL_NumJoysticks());
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        return (NULL);
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    }
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    joysticklist = SDL_joysticks;
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    /* If the joystick is already open, return it
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    * it is important that we have a single joystick * for each instance id
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    */
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    while (joysticklist) {
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        if (SDL_SYS_GetInstanceIdOfDeviceIndex(device_index) == joysticklist->instance_id) {
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                joystick = joysticklist;
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                ++joystick->ref_count;
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                return (joystick);
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        }
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        joysticklist = joysticklist->next;
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    }
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    /* Create and initialize the joystick */
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    joystick = (SDL_Joystick *) SDL_malloc((sizeof *joystick));
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    if (joystick == NULL) {
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        SDL_OutOfMemory();
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        return NULL;
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    }
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    SDL_memset(joystick, 0, (sizeof *joystick));
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    if (SDL_SYS_JoystickOpen(joystick, device_index) < 0) {
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        SDL_free(joystick);
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        return NULL;
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    }
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    joystickname = SDL_SYS_JoystickNameForDeviceIndex(device_index);
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    if (joystickname)
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        joystick->name = SDL_strdup(joystickname);
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    else
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        joystick->name = NULL;
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    if (joystick->naxes > 0) {
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        joystick->axes = (Sint16 *) SDL_malloc
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            (joystick->naxes * sizeof(Sint16));
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    }
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    if (joystick->nhats > 0) {
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        joystick->hats = (Uint8 *) SDL_malloc
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            (joystick->nhats * sizeof(Uint8));
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    }
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    if (joystick->nballs > 0) {
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        joystick->balls = (struct balldelta *) SDL_malloc
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            (joystick->nballs * sizeof(*joystick->balls));
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    }
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    if (joystick->nbuttons > 0) {
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        joystick->buttons = (Uint8 *) SDL_malloc
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            (joystick->nbuttons * sizeof(Uint8));
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    }
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    if (((joystick->naxes > 0) && !joystick->axes)
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        || ((joystick->nhats > 0) && !joystick->hats)
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        || ((joystick->nballs > 0) && !joystick->balls)
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        || ((joystick->nbuttons > 0) && !joystick->buttons)) {
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        SDL_OutOfMemory();
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        SDL_JoystickClose(joystick);
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        return NULL;
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    }
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    if (joystick->axes) {
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        SDL_memset(joystick->axes, 0, joystick->naxes * sizeof(Sint16));
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    }
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    if (joystick->hats) {
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        SDL_memset(joystick->hats, 0, joystick->nhats * sizeof(Uint8));
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    }
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    if (joystick->balls) {
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        SDL_memset(joystick->balls, 0,
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            joystick->nballs * sizeof(*joystick->balls));
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    }
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    if (joystick->buttons) {
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        SDL_memset(joystick->buttons, 0, joystick->nbuttons * sizeof(Uint8));
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    }
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    /* Add joystick to list */
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    ++joystick->ref_count;
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    /* Link the joystick in the list */
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    joystick->next = SDL_joysticks;
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    SDL_joysticks = joystick;
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    SDL_SYS_JoystickUpdate(joystick);
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    return (joystick);
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}
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/*
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 * Checks to make sure the joystick is valid.
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 */
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int
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SDL_PrivateJoystickValid(SDL_Joystick * joystick)
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{
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    int valid;
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    if (joystick == NULL) {
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        SDL_SetError("Joystick hasn't been opened yet");
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        valid = 0;
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    } else {
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        valid = 1;
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    }
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    if (joystick && joystick->closed) {
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        valid = 0;
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    }
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    return valid;
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}
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/*
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 * Get the number of multi-dimensional axis controls on a joystick
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 */
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int
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SDL_JoystickNumAxes(SDL_Joystick * joystick)
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{
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    if (!SDL_PrivateJoystickValid(joystick)) {
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        return (-1);
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    }
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    return (joystick->naxes);
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}
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/*
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 * Get the number of hats on a joystick
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 */
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int
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SDL_JoystickNumHats(SDL_Joystick * joystick)
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{
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    if (!SDL_PrivateJoystickValid(joystick)) {
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        return (-1);
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    }
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    return (joystick->nhats);
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}
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/*
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 * Get the number of trackballs on a joystick
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 */
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int
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SDL_JoystickNumBalls(SDL_Joystick * joystick)
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{
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    if (!SDL_PrivateJoystickValid(joystick)) {
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        return (-1);
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    }
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    return (joystick->nballs);
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}
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/*
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 * Get the number of buttons on a joystick
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 */
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int
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SDL_JoystickNumButtons(SDL_Joystick * joystick)
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{
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    if (!SDL_PrivateJoystickValid(joystick)) {
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        return (-1);
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    }
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    return (joystick->nbuttons);
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}
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/*
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 * Get the current state of an axis control on a joystick
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 */
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Sint16
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SDL_JoystickGetAxis(SDL_Joystick * joystick, int axis)
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{
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    Sint16 state;
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    if (!SDL_PrivateJoystickValid(joystick)) {
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        return (0);
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    }
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    if (axis < joystick->naxes) {
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        state = joystick->axes[axis];
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    } else {
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        SDL_SetError("Joystick only has %d axes", joystick->naxes);
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        state = 0;
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    }
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    return (state);
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}
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/*
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 * Get the current state of a hat on a joystick
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 */
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Uint8
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SDL_JoystickGetHat(SDL_Joystick * joystick, int hat)
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{
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    Uint8 state;
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    if (!SDL_PrivateJoystickValid(joystick)) {
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        return (0);
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    }
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    if (hat < joystick->nhats) {
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        state = joystick->hats[hat];
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    } else {
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        SDL_SetError("Joystick only has %d hats", joystick->nhats);
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        state = 0;
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    }
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    return (state);
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}
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/*
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 * Get the ball axis change since the last poll
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 */
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int
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SDL_JoystickGetBall(SDL_Joystick * joystick, int ball, int *dx, int *dy)
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{
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    int retval;
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    if (!SDL_PrivateJoystickValid(joystick)) {
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        return (-1);
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    }
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    retval = 0;
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    if (ball < joystick->nballs) {
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        if (dx) {
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            *dx = joystick->balls[ball].dx;
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        }
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        if (dy) {
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            *dy = joystick->balls[ball].dy;
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        }
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        joystick->balls[ball].dx = 0;
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        joystick->balls[ball].dy = 0;
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    } else {
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        return SDL_SetError("Joystick only has %d balls", joystick->nballs);
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    }
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    return (retval);
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}
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/*
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 * Get the current state of a button on a joystick
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 */
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Uint8
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SDL_JoystickGetButton(SDL_Joystick * joystick, int button)
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{
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    Uint8 state;
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    if (!SDL_PrivateJoystickValid(joystick)) {
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        return (0);
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    }
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    if (button < joystick->nbuttons) {
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        state = joystick->buttons[button];
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    } else {
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        SDL_SetError("Joystick only has %d buttons", joystick->nbuttons);
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        state = 0;
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    }
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    return (state);
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}
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/*
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 * Return if the joystick in question is currently attached to the system,
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 *  \return SDL_FALSE if not plugged in, SDL_TRUE if still present.
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 */
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SDL_bool
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SDL_JoystickGetAttached(SDL_Joystick * joystick)
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{
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    if (!SDL_PrivateJoystickValid(joystick)) {
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        return SDL_FALSE;
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    }
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    return SDL_SYS_JoystickAttached(joystick);
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}
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/*
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 * Get the instance id for this opened joystick
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 */
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SDL_JoystickID
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SDL_JoystickInstanceID(SDL_Joystick * joystick)
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{
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    if (!SDL_PrivateJoystickValid(joystick)) {
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        return (-1);
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    }
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    return (joystick->instance_id);
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}
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/*
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 * Get the friendly name of this joystick
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 */
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const char *
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SDL_JoystickName(SDL_Joystick * joystick)
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{
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    if (!SDL_PrivateJoystickValid(joystick)) {
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        return (NULL);
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   387
    }
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    return (joystick->name);
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}
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/*
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 * Close a joystick previously opened with SDL_JoystickOpen()
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 */
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void
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SDL_JoystickClose(SDL_Joystick * joystick)
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   397
{
slouken@7191
   398
    SDL_Joystick *joysticklist;
slouken@7191
   399
    SDL_Joystick *joysticklistprev;
slouken@0
   400
slouken@6690
   401
    if (!joystick) {
slouken@1895
   402
        return;
slouken@1895
   403
    }
slouken@0
   404
slouken@1895
   405
    /* First decrement ref count */
slouken@1895
   406
    if (--joystick->ref_count > 0) {
slouken@1895
   407
        return;
slouken@1895
   408
    }
slouken@0
   409
slouken@6712
   410
    if (joystick == SDL_updating_joystick) {
slouken@6712
   411
        return;
slouken@6712
   412
    }
slouken@6712
   413
slouken@1895
   414
    SDL_SYS_JoystickClose(joystick);
slouken@0
   415
slouken@7191
   416
    joysticklist = SDL_joysticks;
slouken@7191
   417
    joysticklistprev = NULL;
slouken@8920
   418
    while (joysticklist) {
slouken@8920
   419
        if (joystick == joysticklist) {
slouken@8920
   420
            if (joysticklistprev) {
slouken@7191
   421
                /* unlink this entry */
slouken@7191
   422
                joysticklistprev->next = joysticklist->next;
slouken@8920
   423
            } else {
slouken@7191
   424
                SDL_joysticks = joystick->next;
slouken@7191
   425
            }
slouken@7191
   426
            break;
slouken@7191
   427
        }
slouken@7191
   428
        joysticklistprev = joysticklist;
slouken@7191
   429
        joysticklist = joysticklist->next;
slouken@7191
   430
    }
slouken@7191
   431
slouken@7719
   432
    SDL_free(joystick->name);
slouken@0
   433
slouken@1895
   434
    /* Free the data associated with this joystick */
slouken@7719
   435
    SDL_free(joystick->axes);
slouken@7719
   436
    SDL_free(joystick->hats);
slouken@7719
   437
    SDL_free(joystick->balls);
slouken@7719
   438
    SDL_free(joystick->buttons);
slouken@1895
   439
    SDL_free(joystick);
slouken@0
   440
}
slouken@0
   441
slouken@1895
   442
void
slouken@1895
   443
SDL_JoystickQuit(void)
slouken@0
   444
{
slouken@6712
   445
    /* Make sure we're not getting called in the middle of updating joysticks */
slouken@6712
   446
    SDL_assert(!SDL_updating_joystick);
slouken@6712
   447
slouken@1895
   448
    /* Stop the event polling */
slouken@8920
   449
    while (SDL_joysticks) {
slouken@7191
   450
        SDL_joysticks->ref_count = 1;
slouken@6690
   451
        SDL_JoystickClose(SDL_joysticks);
slouken@7191
   452
    }
icculus@5856
   453
slouken@1895
   454
    /* Quit the joystick setup */
slouken@1895
   455
    SDL_SYS_JoystickQuit();
slouken@7360
   456
slouken@7360
   457
#if !SDL_EVENTS_DISABLED
slouken@7360
   458
    SDL_QuitSubSystem(SDL_INIT_EVENTS);
slouken@7360
   459
#endif
slouken@0
   460
}
slouken@0
   461
slouken@0
   462
jorgen@7279
   463
static SDL_bool
jorgen@7279
   464
SDL_PrivateJoystickShouldIgnoreEvent()
jorgen@7279
   465
{
slouken@8920
   466
    if (SDL_joystick_allows_background_events) {
jorgen@7279
   467
        return SDL_FALSE;
jorgen@7279
   468
    }
jorgen@7279
   469
slouken@7337
   470
    if (SDL_WasInit(SDL_INIT_VIDEO)) {
slouken@7337
   471
        if (SDL_GetKeyboardFocus() == NULL) {
gabomdq@7677
   472
            /* Video is initialized and we don't have focus, ignore the event. */
slouken@7337
   473
            return SDL_TRUE;
slouken@7337
   474
        } else {
slouken@7337
   475
            return SDL_FALSE;
slouken@7337
   476
        }
jorgen@7279
   477
    }
jorgen@7279
   478
gabomdq@7677
   479
    /* Video subsystem wasn't initialized, always allow the event */
slouken@7337
   480
    return SDL_FALSE;
jorgen@7279
   481
}
jorgen@7279
   482
slouken@0
   483
/* These are global for SDL_sysjoystick.c and SDL_events.c */
slouken@0
   484
slouken@1895
   485
int
slouken@1895
   486
SDL_PrivateJoystickAxis(SDL_Joystick * joystick, Uint8 axis, Sint16 value)
slouken@0
   487
{
slouken@1895
   488
    int posted;
slouken@0
   489
slouken@8920
   490
    /* Make sure we're not getting garbage or duplicate events */
slouken@6145
   491
    if (axis >= joystick->naxes) {
slouken@6145
   492
        return 0;
slouken@6145
   493
    }
slouken@8920
   494
    if (value == joystick->axes[axis]) {
slouken@8920
   495
        return 0;
slouken@8920
   496
    }
slouken@6145
   497
slouken@8903
   498
    /* We ignore events if we don't have keyboard focus, except for centering
slouken@8903
   499
     * events.
slouken@8903
   500
     */
slouken@8903
   501
    if (SDL_PrivateJoystickShouldIgnoreEvent()) {
slouken@8903
   502
        if ((value > 0 && value >= joystick->axes[axis]) ||
slouken@8903
   503
            (value < 0 && value <= joystick->axes[axis])) {
slouken@8903
   504
            return 0;
slouken@8903
   505
        }
slouken@8903
   506
    }
slouken@8903
   507
slouken@1895
   508
    /* Update internal joystick state */
slouken@1895
   509
    joystick->axes[axis] = value;
slouken@0
   510
slouken@1895
   511
    /* Post the event, if desired */
slouken@1895
   512
    posted = 0;
slouken@1361
   513
#if !SDL_EVENTS_DISABLED
slouken@4429
   514
    if (SDL_GetEventState(SDL_JOYAXISMOTION) == SDL_ENABLE) {
slouken@1895
   515
        SDL_Event event;
slouken@1895
   516
        event.type = SDL_JOYAXISMOTION;
slouken@6690
   517
        event.jaxis.which = joystick->instance_id;
slouken@1895
   518
        event.jaxis.axis = axis;
slouken@1895
   519
        event.jaxis.value = value;
slouken@6690
   520
        posted = SDL_PushEvent(&event) == 1;
slouken@1895
   521
    }
slouken@1361
   522
#endif /* !SDL_EVENTS_DISABLED */
slouken@1895
   523
    return (posted);
slouken@0
   524
}
slouken@0
   525
slouken@1895
   526
int
slouken@1895
   527
SDL_PrivateJoystickHat(SDL_Joystick * joystick, Uint8 hat, Uint8 value)
slouken@0
   528
{
slouken@1895
   529
    int posted;
slouken@0
   530
slouken@8920
   531
    /* Make sure we're not getting garbage or duplicate events */
slouken@6145
   532
    if (hat >= joystick->nhats) {
slouken@6145
   533
        return 0;
slouken@6145
   534
    }
slouken@8920
   535
    if (value == joystick->hats[hat]) {
slouken@8920
   536
        return 0;
slouken@8920
   537
    }
slouken@6145
   538
jorgen@7279
   539
    /* We ignore events if we don't have keyboard focus, except for centering
jorgen@7279
   540
     * events.
jorgen@7279
   541
     */
jorgen@7279
   542
    if (SDL_PrivateJoystickShouldIgnoreEvent()) {
slouken@8903
   543
        if (value != SDL_HAT_CENTERED) {
jorgen@7279
   544
            return 0;
jorgen@7279
   545
        }
jorgen@7279
   546
    }
jorgen@7279
   547
slouken@8903
   548
    /* Update internal joystick state */
slouken@8903
   549
    joystick->hats[hat] = value;
jorgen@7279
   550
slouken@1895
   551
    /* Post the event, if desired */
slouken@1895
   552
    posted = 0;
slouken@1361
   553
#if !SDL_EVENTS_DISABLED
slouken@4429
   554
    if (SDL_GetEventState(SDL_JOYHATMOTION) == SDL_ENABLE) {
slouken@1895
   555
        SDL_Event event;
slouken@1895
   556
        event.jhat.type = SDL_JOYHATMOTION;
slouken@6690
   557
        event.jhat.which = joystick->instance_id;
slouken@1895
   558
        event.jhat.hat = hat;
slouken@1895
   559
        event.jhat.value = value;
slouken@6690
   560
        posted = SDL_PushEvent(&event) == 1;
slouken@1895
   561
    }
slouken@1361
   562
#endif /* !SDL_EVENTS_DISABLED */
slouken@1895
   563
    return (posted);
slouken@0
   564
}
slouken@0
   565
slouken@1895
   566
int
slouken@1895
   567
SDL_PrivateJoystickBall(SDL_Joystick * joystick, Uint8 ball,
slouken@1895
   568
                        Sint16 xrel, Sint16 yrel)
slouken@0
   569
{
slouken@1895
   570
    int posted;
slouken@0
   571
slouken@6145
   572
    /* Make sure we're not getting garbage events */
slouken@6145
   573
    if (ball >= joystick->nballs) {
slouken@6145
   574
        return 0;
slouken@6145
   575
    }
slouken@6145
   576
jorgen@7279
   577
    /* We ignore events if we don't have keyboard focus. */
jorgen@7279
   578
    if (SDL_PrivateJoystickShouldIgnoreEvent()) {
jorgen@7279
   579
        return 0;
jorgen@7279
   580
    }
jorgen@7279
   581
slouken@1895
   582
    /* Update internal mouse state */
slouken@1895
   583
    joystick->balls[ball].dx += xrel;
slouken@1895
   584
    joystick->balls[ball].dy += yrel;
slouken@0
   585
slouken@1895
   586
    /* Post the event, if desired */
slouken@1895
   587
    posted = 0;
slouken@1361
   588
#if !SDL_EVENTS_DISABLED
slouken@4429
   589
    if (SDL_GetEventState(SDL_JOYBALLMOTION) == SDL_ENABLE) {
slouken@1895
   590
        SDL_Event event;
slouken@1895
   591
        event.jball.type = SDL_JOYBALLMOTION;
slouken@6690
   592
        event.jball.which = joystick->instance_id;
slouken@1895
   593
        event.jball.ball = ball;
slouken@1895
   594
        event.jball.xrel = xrel;
slouken@1895
   595
        event.jball.yrel = yrel;
slouken@6690
   596
        posted = SDL_PushEvent(&event) == 1;
slouken@1895
   597
    }
slouken@1361
   598
#endif /* !SDL_EVENTS_DISABLED */
slouken@1895
   599
    return (posted);
slouken@0
   600
}
slouken@0
   601
slouken@1895
   602
int
slouken@1895
   603
SDL_PrivateJoystickButton(SDL_Joystick * joystick, Uint8 button, Uint8 state)
slouken@0
   604
{
slouken@1895
   605
    int posted;
slouken@1361
   606
#if !SDL_EVENTS_DISABLED
slouken@1895
   607
    SDL_Event event;
slouken@0
   608
slouken@1895
   609
    switch (state) {
slouken@1895
   610
    case SDL_PRESSED:
slouken@1895
   611
        event.type = SDL_JOYBUTTONDOWN;
slouken@1895
   612
        break;
slouken@1895
   613
    case SDL_RELEASED:
slouken@1895
   614
        event.type = SDL_JOYBUTTONUP;
slouken@1895
   615
        break;
slouken@1895
   616
    default:
slouken@1895
   617
        /* Invalid state -- bail */
slouken@1895
   618
        return (0);
slouken@1895
   619
    }
slouken@1361
   620
#endif /* !SDL_EVENTS_DISABLED */
slouken@0
   621
slouken@8920
   622
    /* Make sure we're not getting garbage or duplicate events */
slouken@6145
   623
    if (button >= joystick->nbuttons) {
slouken@6145
   624
        return 0;
slouken@8920
   625
	}
slouken@8920
   626
	if (state == joystick->buttons[button]) {
slouken@8920
   627
		return 0;
slouken@8920
   628
	}
slouken@6145
   629
jorgen@7279
   630
    /* We ignore events if we don't have keyboard focus, except for button
jorgen@7279
   631
     * release. */
slouken@8903
   632
    if (SDL_PrivateJoystickShouldIgnoreEvent()) {
slouken@8903
   633
        if (state == SDL_PRESSED) {
slouken@8903
   634
            return 0;
slouken@8903
   635
        }
jorgen@7279
   636
    }
jorgen@7279
   637
slouken@1895
   638
    /* Update internal joystick state */
slouken@1895
   639
    joystick->buttons[button] = state;
slouken@0
   640
slouken@1895
   641
    /* Post the event, if desired */
slouken@1895
   642
    posted = 0;
slouken@1361
   643
#if !SDL_EVENTS_DISABLED
slouken@4429
   644
    if (SDL_GetEventState(event.type) == SDL_ENABLE) {
slouken@6690
   645
        event.jbutton.which = joystick->instance_id;
slouken@1895
   646
        event.jbutton.button = button;
slouken@1895
   647
        event.jbutton.state = state;
slouken@6690
   648
        posted = SDL_PushEvent(&event) == 1;
slouken@1895
   649
    }
slouken@1361
   650
#endif /* !SDL_EVENTS_DISABLED */
slouken@1895
   651
    return (posted);
slouken@0
   652
}
slouken@0
   653
slouken@1895
   654
void
slouken@1895
   655
SDL_JoystickUpdate(void)
slouken@0
   656
{
slouken@7191
   657
    SDL_Joystick *joystick;
slouken@7191
   658
slouken@7191
   659
    joystick = SDL_joysticks;
slouken@8920
   660
    while (joystick) {
slouken@7191
   661
        SDL_Joystick *joysticknext;
slouken@7191
   662
        /* save off the next pointer, the Update call may cause a joystick removed event
slouken@7191
   663
         * and cause our joystick pointer to be freed
slouken@7191
   664
         */
slouken@7191
   665
        joysticknext = joystick->next;
slouken@0
   666
slouken@6712
   667
        SDL_updating_joystick = joystick;
slouken@6712
   668
slouken@8920
   669
        SDL_SYS_JoystickUpdate(joystick);
slouken@6690
   670
slouken@8920
   671
        if (joystick->closed && joystick->uncentered) {
slouken@7191
   672
            int i;
slouken@6690
   673
slouken@6712
   674
            /* Tell the app that everything is centered/unpressed...  */
slouken@6690
   675
            for (i = 0; i < joystick->naxes; i++)
slouken@6690
   676
                SDL_PrivateJoystickAxis(joystick, i, 0);
slouken@6690
   677
slouken@6690
   678
            for (i = 0; i < joystick->nbuttons; i++)
slouken@6690
   679
                SDL_PrivateJoystickButton(joystick, i, 0);
slouken@6690
   680
slouken@6690
   681
            for (i = 0; i < joystick->nhats; i++)
slouken@6690
   682
                SDL_PrivateJoystickHat(joystick, i, SDL_HAT_CENTERED);
slouken@6712
   683
slouken@8920
   684
            joystick->uncentered = SDL_FALSE;
slouken@7191
   685
        }
slouken@6690
   686
slouken@6712
   687
        SDL_updating_joystick = NULL;
slouken@6712
   688
slouken@6712
   689
        /* If the joystick was closed while updating, free it here */
slouken@8920
   690
        if (joystick->ref_count <= 0) {
slouken@6712
   691
            SDL_JoystickClose(joystick);
slouken@6712
   692
        }
slouken@6712
   693
slouken@7191
   694
        joystick = joysticknext;
slouken@7191
   695
    }
slouken@6690
   696
slouken@7191
   697
    /* this needs to happen AFTER walking the joystick list above, so that any
slouken@7191
   698
       dangling hardware data from removed devices can be free'd
slouken@7191
   699
     */
slouken@7191
   700
    SDL_SYS_JoystickDetect();
slouken@0
   701
}
slouken@0
   702
slouken@1895
   703
int
slouken@1895
   704
SDL_JoystickEventState(int state)
slouken@0
   705
{
slouken@1361
   706
#if SDL_EVENTS_DISABLED
slouken@6753
   707
    return SDL_DISABLE;
slouken@0
   708
#else
slouken@4429
   709
    const Uint32 event_list[] = {
slouken@1895
   710
        SDL_JOYAXISMOTION, SDL_JOYBALLMOTION, SDL_JOYHATMOTION,
slouken@6690
   711
        SDL_JOYBUTTONDOWN, SDL_JOYBUTTONUP, SDL_JOYDEVICEADDED, SDL_JOYDEVICEREMOVED
slouken@1895
   712
    };
slouken@1895
   713
    unsigned int i;
slouken@0
   714
slouken@1895
   715
    switch (state) {
slouken@1895
   716
    case SDL_QUERY:
slouken@6753
   717
        state = SDL_DISABLE;
slouken@1895
   718
        for (i = 0; i < SDL_arraysize(event_list); ++i) {
slouken@1895
   719
            state = SDL_EventState(event_list[i], SDL_QUERY);
slouken@1895
   720
            if (state == SDL_ENABLE) {
slouken@1895
   721
                break;
slouken@1895
   722
            }
slouken@1895
   723
        }
slouken@1895
   724
        break;
slouken@1895
   725
    default:
slouken@1895
   726
        for (i = 0; i < SDL_arraysize(event_list); ++i) {
slouken@1895
   727
            SDL_EventState(event_list[i], state);
slouken@1895
   728
        }
slouken@1895
   729
        break;
slouken@1895
   730
    }
slouken@1895
   731
    return (state);
slouken@1361
   732
#endif /* SDL_EVENTS_DISABLED */
slouken@0
   733
}
slouken@1895
   734
slouken@6693
   735
/* return the guid for this index */
slouken@6738
   736
SDL_JoystickGUID SDL_JoystickGetDeviceGUID(int device_index)
slouken@6690
   737
{
slouken@7294
   738
    if ((device_index < 0) || (device_index >= SDL_NumJoysticks())) {
slouken@7294
   739
        SDL_JoystickGUID emptyGUID;
slouken@7294
   740
        SDL_SetError("There are %d joysticks available", SDL_NumJoysticks());
slouken@8920
   741
        SDL_zero(emptyGUID);
slouken@7294
   742
        return emptyGUID;
slouken@7294
   743
    }
slouken@8920
   744
    return SDL_SYS_JoystickGetDeviceGUID(device_index);
slouken@6690
   745
}
slouken@6690
   746
slouken@6693
   747
/* return the guid for this opened device */
slouken@6738
   748
SDL_JoystickGUID SDL_JoystickGetGUID(SDL_Joystick * joystick)
slouken@6690
   749
{
slouken@7789
   750
    if (!SDL_PrivateJoystickValid(joystick)) {
slouken@7789
   751
        SDL_JoystickGUID emptyGUID;
slouken@8920
   752
        SDL_zero(emptyGUID);
slouken@7789
   753
        return emptyGUID;
slouken@7789
   754
    }
slouken@8920
   755
    return SDL_SYS_JoystickGetGUID(joystick);
slouken@6690
   756
}
slouken@6690
   757
slouken@6690
   758
/* convert the guid to a printable string */
slouken@8920
   759
void SDL_JoystickGetGUIDString(SDL_JoystickGUID guid, char *pszGUID, int cbGUID)
slouken@6690
   760
{
slouken@7191
   761
    static const char k_rgchHexToASCII[] = "0123456789abcdef";
slouken@7191
   762
    int i;
slouken@6690
   763
icculus@6748
   764
    if ((pszGUID == NULL) || (cbGUID <= 0)) {
icculus@6748
   765
        return;
icculus@6748
   766
    }
icculus@6748
   767
slouken@8920
   768
    for (i = 0; i < sizeof(guid.data) && i < (cbGUID-1)/2; i++) {
slouken@7191
   769
        /* each input byte writes 2 ascii chars, and might write a null byte. */
slouken@7191
   770
        /* If we don't have room for next input byte, stop */
slouken@7191
   771
        unsigned char c = guid.data[i];
slouken@6690
   772
slouken@8920
   773
        *pszGUID++ = k_rgchHexToASCII[c >> 4];
slouken@8920
   774
        *pszGUID++ = k_rgchHexToASCII[c & 0x0F];
slouken@7191
   775
    }
slouken@7191
   776
    *pszGUID = '\0';
slouken@6690
   777
}
slouken@6690
   778
slouken@6690
   779
slouken@7191
   780
/*-----------------------------------------------------------------------------
slouken@7191
   781
 * Purpose: Returns the 4 bit nibble for a hex character
slouken@7191
   782
 * Input  : c -
slouken@7191
   783
 * Output : unsigned char
slouken@7191
   784
 *-----------------------------------------------------------------------------*/
slouken@8920
   785
static unsigned char nibble(char c)
slouken@6690
   786
{
slouken@8920
   787
    if ((c >= '0') && (c <= '9')) {
slouken@7191
   788
        return (unsigned char)(c - '0');
slouken@7191
   789
    }
slouken@6690
   790
slouken@8920
   791
    if ((c >= 'A') && (c <= 'F')) {
slouken@7191
   792
        return (unsigned char)(c - 'A' + 0x0a);
slouken@7191
   793
    }
slouken@6690
   794
slouken@8920
   795
    if ((c >= 'a') && (c <= 'f')) {
slouken@7191
   796
        return (unsigned char)(c - 'a' + 0x0a);
slouken@7191
   797
    }
slouken@6690
   798
slouken@7191
   799
    /* received an invalid character, and no real way to return an error */
slouken@8920
   800
    /* AssertMsg1(false, "Q_nibble invalid hex character '%c' ", c); */
slouken@7191
   801
    return 0;
slouken@6690
   802
}
slouken@6690
   803
slouken@6690
   804
slouken@6690
   805
/* convert the string version of a joystick guid to the struct */
slouken@6738
   806
SDL_JoystickGUID SDL_JoystickGetGUIDFromString(const char *pchGUID)
slouken@6690
   807
{
slouken@7191
   808
    SDL_JoystickGUID guid;
slouken@7191
   809
    int maxoutputbytes= sizeof(guid);
slouken@8920
   810
    size_t len = SDL_strlen(pchGUID);
slouken@7191
   811
    Uint8 *p;
slouken@7922
   812
    size_t i;
slouken@6690
   813
slouken@7191
   814
    /* Make sure it's even */
slouken@8920
   815
    len = (len) & ~0x1;
slouken@6690
   816
slouken@8920
   817
    SDL_memset(&guid, 0x00, sizeof(guid));
slouken@6690
   818
slouken@7191
   819
    p = (Uint8 *)&guid;
slouken@8920
   820
    for (i = 0; (i < len) && ((p - (Uint8 *)&guid) < maxoutputbytes); i+=2, p++) {
slouken@8920
   821
        *p = (nibble(pchGUID[i]) << 4) | nibble(pchGUID[i+1]);
slouken@7191
   822
    }
slouken@6690
   823
slouken@7191
   824
    return guid;
slouken@6690
   825
}
slouken@6690
   826
slouken@6690
   827
slouken@1895
   828
/* vi: set ts=4 sw=4 expandtab: */