src/haptic/SDL_haptic.c
author Ryan C. Gordon <icculus@icculus.org>
Thu, 09 Aug 2012 14:14:41 -0400
changeset 6389 43a190ad60a7
parent 6138 4c64952a58fb
child 6690 9548c8a58103
permissions -rwxr-xr-x
Removed some unused variables that gcc 4.6.1 complains about.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2012 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_config.h"
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#include "SDL_syshaptic.h"
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#include "SDL_haptic_c.h"
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#include "../joystick/SDL_joystick_c.h" /* For SDL_PrivateJoystickValid */
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Uint8 SDL_numhaptics = 0;
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SDL_Haptic **SDL_haptics = NULL;
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/*
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 * Initializes the Haptic devices.
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 */
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int
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SDL_HapticInit(void)
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{
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    int arraylen;
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    int status;
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    SDL_numhaptics = 0;
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    status = SDL_SYS_HapticInit();
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    if (status >= 0) {
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        arraylen = (status + 1) * sizeof(*SDL_haptics);
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        SDL_haptics = (SDL_Haptic **) SDL_malloc(arraylen);
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        if (SDL_haptics == NULL) {      /* Out of memory. */
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            SDL_numhaptics = 0;
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        } else {
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            SDL_memset(SDL_haptics, 0, arraylen);
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            SDL_numhaptics = status;
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        }
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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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 * Checks to see if the haptic device is valid
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 */
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static int
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ValidHaptic(SDL_Haptic * haptic)
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{
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    int i;
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    int valid;
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    valid = 0;
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    if (haptic != NULL) {
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        for (i = 0; i < SDL_numhaptics; i++) {
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            if (SDL_haptics[i] == haptic) {
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                valid = 1;
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                break;
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            }
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        }
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    }
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    /* Create the error here. */
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    if (valid == 0) {
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        SDL_SetError("Haptic: Invalid haptic device identifier");
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    }
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    return valid;
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}
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/*
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 * Returns the number of available devices.
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 */
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int
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SDL_NumHaptics(void)
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{
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    return SDL_numhaptics;
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}
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/*
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 * Gets the name of a Haptic device by index.
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 */
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const char *
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SDL_HapticName(int device_index)
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{
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    if ((device_index < 0) || (device_index >= SDL_numhaptics)) {
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        SDL_SetError("Haptic: There are %d haptic devices available",
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                     SDL_numhaptics);
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        return NULL;
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    }
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    return SDL_SYS_HapticName(device_index);
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}
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/*
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 * Opens a Haptic device.
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 */
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SDL_Haptic *
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SDL_HapticOpen(int device_index)
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{
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    int i;
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    SDL_Haptic *haptic;
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    if ((device_index < 0) || (device_index >= SDL_numhaptics)) {
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        SDL_SetError("Haptic: There are %d haptic devices available",
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                     SDL_numhaptics);
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        return NULL;
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    }
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    /* If the haptic is already open, return it */
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    for (i = 0; SDL_haptics[i]; i++) {
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        if (device_index == SDL_haptics[i]->index) {
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            haptic = SDL_haptics[i];
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            ++haptic->ref_count;
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            return haptic;
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        }
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    }
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    /* Create the haptic device */
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    haptic = (SDL_Haptic *) SDL_malloc((sizeof *haptic));
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    if (haptic == NULL) {
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        SDL_OutOfMemory();
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        return NULL;
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    }
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    /* Initialize the haptic device */
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    SDL_memset(haptic, 0, (sizeof *haptic));
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    haptic->rumble_id = -1;
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    haptic->index = device_index;
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    if (SDL_SYS_HapticOpen(haptic) < 0) {
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        SDL_free(haptic);
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        return NULL;
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    }
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    /* Disable autocenter and set gain to max. */
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    if (haptic->supported & SDL_HAPTIC_GAIN)
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        SDL_HapticSetGain(haptic, 100);
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    if (haptic->supported & SDL_HAPTIC_AUTOCENTER)
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        SDL_HapticSetAutocenter(haptic, 0);
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    /* Add haptic to list */
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    ++haptic->ref_count;
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    for (i = 0; SDL_haptics[i]; i++)
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        /* Skip to next haptic */ ;
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    SDL_haptics[i] = haptic;
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    return haptic;
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}
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/*
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 * Returns 1 if the device has been opened.
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 */
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int
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SDL_HapticOpened(int device_index)
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{
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    int i, opened;
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    opened = 0;
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    for (i = 0; SDL_haptics[i]; i++) {
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        if (SDL_haptics[i]->index == (Uint8) device_index) {
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            opened = 1;
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            break;
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        }
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    }
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    return opened;
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}
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/*
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 * Returns the index to a haptic device.
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 */
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int
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SDL_HapticIndex(SDL_Haptic * haptic)
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{
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    if (!ValidHaptic(haptic)) {
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        return -1;
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    }
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    return haptic->index;
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}
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/*
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 * Returns SDL_TRUE if mouse is haptic, SDL_FALSE if it isn't.
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 */
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int
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SDL_MouseIsHaptic(void)
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{
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    if (SDL_SYS_HapticMouse() < 0)
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        return SDL_FALSE;
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    return SDL_TRUE;
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}
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/*
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 * Returns the haptic device if mouse is haptic or NULL elsewise.
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 */
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SDL_Haptic *
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SDL_HapticOpenFromMouse(void)
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{
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    int device_index;
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    device_index = SDL_SYS_HapticMouse();
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    if (device_index < 0) {
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        SDL_SetError("Haptic: Mouse isn't a haptic device.");
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        return NULL;
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    }
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    return SDL_HapticOpen(device_index);
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}
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/*
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 * Returns SDL_TRUE if joystick has haptic features.
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 */
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int
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SDL_JoystickIsHaptic(SDL_Joystick * joystick)
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{
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    int ret;
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    /* Must be a valid joystick */
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    if (!SDL_PrivateJoystickValid(&joystick)) {
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        return -1;
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    }
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    ret = SDL_SYS_JoystickIsHaptic(joystick);
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    if (ret > 0)
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        return SDL_TRUE;
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    else if (ret == 0)
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        return SDL_FALSE;
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    else
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        return -1;
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}
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/*
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 * Opens a haptic device from a joystick.
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 */
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SDL_Haptic *
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SDL_HapticOpenFromJoystick(SDL_Joystick * joystick)
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{
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    int i;
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    SDL_Haptic *haptic;
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    /* Must be a valid joystick */
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    if (!SDL_PrivateJoystickValid(&joystick)) {
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        SDL_SetError("Haptic: Joystick isn't valid.");
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        return NULL;
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    }
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    /* Joystick must be haptic */
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    if (SDL_SYS_JoystickIsHaptic(joystick) <= 0) {
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        SDL_SetError("Haptic: Joystick isn't a haptic device.");
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        return NULL;
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    }
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    /* Check to see if joystick's haptic is already open */
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    for (i = 0; SDL_haptics[i]; i++) {
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        if (SDL_SYS_JoystickSameHaptic(SDL_haptics[i], joystick)) {
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            haptic = SDL_haptics[i];
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            ++haptic->ref_count;
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            return haptic;
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        }
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    }
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    /* Create the haptic device */
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    haptic = (SDL_Haptic *) SDL_malloc((sizeof *haptic));
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    if (haptic == NULL) {
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        SDL_OutOfMemory();
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        return NULL;
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    }
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    /* Initialize the haptic device */
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    SDL_memset(haptic, 0, sizeof(SDL_Haptic));
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    haptic->rumble_id = -1;
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    if (SDL_SYS_HapticOpenFromJoystick(haptic, joystick) < 0) {
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        SDL_free(haptic);
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        return NULL;
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    }
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    /* Add haptic to list */
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    ++haptic->ref_count;
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    for (i = 0; SDL_haptics[i]; i++)
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        /* Skip to next haptic */ ;
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    SDL_haptics[i] = haptic;
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    return haptic;
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}
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/*
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 * Closes a SDL_Haptic device.
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 */
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void
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SDL_HapticClose(SDL_Haptic * haptic)
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{
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    int i;
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    /* Must be valid */
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    if (!ValidHaptic(haptic)) {
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        return;
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    }
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    /* Check if it's still in use */
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    if (--haptic->ref_count < 0) {
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        return;
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    }
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    /* Close it, properly removing effects if needed */
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    for (i = 0; i < haptic->neffects; i++) {
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        if (haptic->effects[i].hweffect != NULL) {
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            SDL_HapticDestroyEffect(haptic, i);
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        }
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    }
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    SDL_SYS_HapticClose(haptic);
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    /* Remove from the list */
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    for (i = 0; SDL_haptics[i]; ++i) {
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        if (haptic == SDL_haptics[i]) {
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            SDL_haptics[i] = NULL;
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            SDL_memcpy(&SDL_haptics[i], &SDL_haptics[i + 1],
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                       (SDL_numhaptics - i) * sizeof(haptic));
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            break;
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        }
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    }
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    /* Free */
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    SDL_free(haptic);
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}
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/*
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 * Cleans up after the subsystem.
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 */
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void
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SDL_HapticQuit(void)
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{
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    SDL_SYS_HapticQuit();
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    if (SDL_haptics != NULL) {
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        SDL_free(SDL_haptics);
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        SDL_haptics = NULL;
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    }
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    SDL_numhaptics = 0;
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}
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/*
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 * Returns the number of effects a haptic device has.
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 */
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int
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SDL_HapticNumEffects(SDL_Haptic * haptic)
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{
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    if (!ValidHaptic(haptic)) {
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        return -1;
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    }
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    return haptic->neffects;
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}
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/*
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 * Returns the number of effects a haptic device can play.
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 */
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int
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SDL_HapticNumEffectsPlaying(SDL_Haptic * haptic)
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{
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   385
    if (!ValidHaptic(haptic)) {
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        return -1;
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   387
    }
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    return haptic->nplaying;
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}
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   393
/*
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 * Returns supported effects by the device.
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 */
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unsigned int
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SDL_HapticQuery(SDL_Haptic * haptic)
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   398
{
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   399
    if (!ValidHaptic(haptic)) {
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   400
        return -1;
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    }
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   402
slouken@2713
   403
    return haptic->supported;
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   404
}
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   405
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   406
slouken@2713
   407
/*
slouken@2713
   408
 * Returns the number of axis on the device.
slouken@2713
   409
 */
slouken@2713
   410
int
slouken@2713
   411
SDL_HapticNumAxes(SDL_Haptic * haptic)
slouken@2713
   412
{
slouken@2713
   413
    if (!ValidHaptic(haptic)) {
slouken@2713
   414
        return -1;
slouken@2713
   415
    }
slouken@2713
   416
slouken@2713
   417
    return haptic->naxes;
slouken@2713
   418
}
slouken@2713
   419
slouken@2713
   420
/*
slouken@2713
   421
 * Checks to see if the device can support the effect.
slouken@2713
   422
 */
slouken@2713
   423
int
slouken@2713
   424
SDL_HapticEffectSupported(SDL_Haptic * haptic, SDL_HapticEffect * effect)
slouken@2713
   425
{
slouken@2713
   426
    if (!ValidHaptic(haptic)) {
slouken@2713
   427
        return -1;
slouken@2713
   428
    }
slouken@2713
   429
slouken@2713
   430
    if ((haptic->supported & effect->type) != 0)
slouken@2713
   431
        return SDL_TRUE;
slouken@2713
   432
    return SDL_FALSE;
slouken@2713
   433
}
slouken@2713
   434
slouken@2713
   435
/*
slouken@2713
   436
 * Creates a new haptic effect.
slouken@2713
   437
 */
slouken@2713
   438
int
slouken@2713
   439
SDL_HapticNewEffect(SDL_Haptic * haptic, SDL_HapticEffect * effect)
slouken@2713
   440
{
slouken@2713
   441
    int i;
slouken@2713
   442
slouken@2713
   443
    /* Check for device validity. */
slouken@2713
   444
    if (!ValidHaptic(haptic)) {
slouken@2713
   445
        return -1;
slouken@2713
   446
    }
slouken@2713
   447
slouken@2713
   448
    /* Check to see if effect is supported */
slouken@2713
   449
    if (SDL_HapticEffectSupported(haptic, effect) == SDL_FALSE) {
slouken@2713
   450
        SDL_SetError("Haptic: Effect not supported by haptic device.");
slouken@2713
   451
        return -1;
slouken@2713
   452
    }
slouken@2713
   453
slouken@2713
   454
    /* See if there's a free slot */
slouken@2713
   455
    for (i = 0; i < haptic->neffects; i++) {
slouken@2713
   456
        if (haptic->effects[i].hweffect == NULL) {
slouken@2713
   457
slouken@2713
   458
            /* Now let the backend create the real effect */
slouken@2713
   459
            if (SDL_SYS_HapticNewEffect(haptic, &haptic->effects[i], effect)
slouken@2713
   460
                != 0) {
slouken@2713
   461
                return -1;      /* Backend failed to create effect */
slouken@2713
   462
            }
slouken@2713
   463
slouken@2713
   464
            SDL_memcpy(&haptic->effects[i].effect, effect,
slouken@2713
   465
                       sizeof(SDL_HapticEffect));
slouken@2713
   466
            return i;
slouken@2713
   467
        }
slouken@2713
   468
    }
slouken@2713
   469
slouken@2713
   470
    SDL_SetError("Haptic: Device has no free space left.");
slouken@2713
   471
    return -1;
slouken@2713
   472
}
slouken@2713
   473
slouken@2713
   474
/*
slouken@2713
   475
 * Checks to see if an effect is valid.
slouken@2713
   476
 */
slouken@2713
   477
static int
slouken@2713
   478
ValidEffect(SDL_Haptic * haptic, int effect)
slouken@2713
   479
{
slouken@2713
   480
    if ((effect < 0) || (effect >= haptic->neffects)) {
slouken@2713
   481
        SDL_SetError("Haptic: Invalid effect identifier.");
slouken@2713
   482
        return 0;
slouken@2713
   483
    }
slouken@2713
   484
    return 1;
slouken@2713
   485
}
slouken@2713
   486
slouken@2713
   487
/*
slouken@2713
   488
 * Updates an effect.
slouken@2713
   489
 */
slouken@2713
   490
int
slouken@2713
   491
SDL_HapticUpdateEffect(SDL_Haptic * haptic, int effect,
slouken@2713
   492
                       SDL_HapticEffect * data)
slouken@2713
   493
{
slouken@2713
   494
    if (!ValidHaptic(haptic) || !ValidEffect(haptic, effect)) {
slouken@2713
   495
        return -1;
slouken@2713
   496
    }
slouken@2713
   497
slouken@2713
   498
    /* Can't change type dynamically. */
slouken@2713
   499
    if (data->type != haptic->effects[effect].effect.type) {
slouken@2713
   500
        SDL_SetError("Haptic: Updating effect type is illegal.");
slouken@2713
   501
        return -1;
slouken@2713
   502
    }
slouken@2713
   503
slouken@2713
   504
    /* Updates the effect */
slouken@2713
   505
    if (SDL_SYS_HapticUpdateEffect(haptic, &haptic->effects[effect], data) <
slouken@2713
   506
        0) {
slouken@2713
   507
        return -1;
slouken@2713
   508
    }
slouken@2713
   509
slouken@2713
   510
    SDL_memcpy(&haptic->effects[effect].effect, data,
slouken@2713
   511
               sizeof(SDL_HapticEffect));
slouken@2713
   512
    return 0;
slouken@2713
   513
}
slouken@2713
   514
slouken@2713
   515
slouken@2713
   516
/*
slouken@2713
   517
 * Runs the haptic effect on the device.
slouken@2713
   518
 */
slouken@2713
   519
int
slouken@2713
   520
SDL_HapticRunEffect(SDL_Haptic * haptic, int effect, Uint32 iterations)
slouken@2713
   521
{
slouken@2713
   522
    if (!ValidHaptic(haptic) || !ValidEffect(haptic, effect)) {
slouken@2713
   523
        return -1;
slouken@2713
   524
    }
slouken@2713
   525
slouken@2713
   526
    /* Run the effect */
slouken@2713
   527
    if (SDL_SYS_HapticRunEffect(haptic, &haptic->effects[effect], iterations)
slouken@2713
   528
        < 0) {
slouken@2713
   529
        return -1;
slouken@2713
   530
    }
slouken@2713
   531
slouken@2713
   532
    return 0;
slouken@2713
   533
}
slouken@2713
   534
slouken@2713
   535
/*
slouken@2713
   536
 * Stops the haptic effect on the device.
slouken@2713
   537
 */
slouken@2713
   538
int
slouken@2713
   539
SDL_HapticStopEffect(SDL_Haptic * haptic, int effect)
slouken@2713
   540
{
slouken@2713
   541
    if (!ValidHaptic(haptic) || !ValidEffect(haptic, effect)) {
slouken@2713
   542
        return -1;
slouken@2713
   543
    }
slouken@2713
   544
slouken@2713
   545
    /* Stop the effect */
slouken@2713
   546
    if (SDL_SYS_HapticStopEffect(haptic, &haptic->effects[effect]) < 0) {
slouken@2713
   547
        return -1;
slouken@2713
   548
    }
slouken@2713
   549
slouken@2713
   550
    return 0;
slouken@2713
   551
}
slouken@2713
   552
slouken@2713
   553
/*
slouken@2713
   554
 * Gets rid of a haptic effect.
slouken@2713
   555
 */
slouken@2713
   556
void
slouken@2713
   557
SDL_HapticDestroyEffect(SDL_Haptic * haptic, int effect)
slouken@2713
   558
{
slouken@2713
   559
    if (!ValidHaptic(haptic) || !ValidEffect(haptic, effect)) {
slouken@2713
   560
        return;
slouken@2713
   561
    }
slouken@2713
   562
slouken@2713
   563
    /* Not allocated */
slouken@2713
   564
    if (haptic->effects[effect].hweffect == NULL) {
slouken@2713
   565
        return;
slouken@2713
   566
    }
slouken@2713
   567
slouken@2713
   568
    SDL_SYS_HapticDestroyEffect(haptic, &haptic->effects[effect]);
slouken@2713
   569
}
slouken@2713
   570
slouken@2713
   571
/*
slouken@2713
   572
 * Gets the status of a haptic effect.
slouken@2713
   573
 */
slouken@2713
   574
int
slouken@2713
   575
SDL_HapticGetEffectStatus(SDL_Haptic * haptic, int effect)
slouken@2713
   576
{
slouken@2713
   577
    if (!ValidHaptic(haptic) || !ValidEffect(haptic, effect)) {
slouken@2713
   578
        return -1;
slouken@2713
   579
    }
slouken@2713
   580
slouken@2713
   581
    if ((haptic->supported & SDL_HAPTIC_STATUS) == 0) {
slouken@2713
   582
        SDL_SetError("Haptic: Device does not support status queries.");
slouken@2713
   583
        return -1;
slouken@2713
   584
    }
slouken@2713
   585
slouken@2713
   586
    return SDL_SYS_HapticGetEffectStatus(haptic, &haptic->effects[effect]);
slouken@2713
   587
}
slouken@2713
   588
slouken@2713
   589
/*
slouken@2713
   590
 * Sets the global gain of the device.
slouken@2713
   591
 */
slouken@2713
   592
int
slouken@2713
   593
SDL_HapticSetGain(SDL_Haptic * haptic, int gain)
slouken@2713
   594
{
slouken@2713
   595
    const char *env;
slouken@2713
   596
    int real_gain, max_gain;
slouken@2713
   597
slouken@2713
   598
    if (!ValidHaptic(haptic)) {
slouken@2713
   599
        return -1;
slouken@2713
   600
    }
slouken@2713
   601
slouken@2713
   602
    if ((haptic->supported & SDL_HAPTIC_GAIN) == 0) {
slouken@2713
   603
        SDL_SetError("Haptic: Device does not support setting gain.");
slouken@2713
   604
        return -1;
slouken@2713
   605
    }
slouken@2713
   606
slouken@2713
   607
    if ((gain < 0) || (gain > 100)) {
slouken@2713
   608
        SDL_SetError("Haptic: Gain must be between 0 and 100.");
slouken@2713
   609
        return -1;
slouken@2713
   610
    }
slouken@2713
   611
slouken@2713
   612
    /* We use the envvar to get the maximum gain. */
slouken@2713
   613
    env = SDL_getenv("SDL_HAPTIC_GAIN_MAX");
slouken@2713
   614
    if (env != NULL) {
slouken@2713
   615
        max_gain = SDL_atoi(env);
slouken@2713
   616
slouken@2713
   617
        /* Check for sanity. */
slouken@2713
   618
        if (max_gain < 0)
slouken@2713
   619
            max_gain = 0;
slouken@2713
   620
        else if (max_gain > 100)
slouken@2713
   621
            max_gain = 100;
slouken@2713
   622
slouken@2713
   623
        /* We'll scale it linearly with SDL_HAPTIC_GAIN_MAX */
slouken@2713
   624
        real_gain = (gain * max_gain) / 100;
slouken@2713
   625
    } else {
slouken@2713
   626
        real_gain = gain;
slouken@2713
   627
    }
slouken@2713
   628
slouken@2713
   629
    if (SDL_SYS_HapticSetGain(haptic, real_gain) < 0) {
slouken@2713
   630
        return -1;
slouken@2713
   631
    }
slouken@2713
   632
slouken@2713
   633
    return 0;
slouken@2713
   634
}
slouken@2713
   635
slouken@2713
   636
/*
slouken@2713
   637
 * Makes the device autocenter, 0 disables.
slouken@2713
   638
 */
slouken@2713
   639
int
slouken@2713
   640
SDL_HapticSetAutocenter(SDL_Haptic * haptic, int autocenter)
slouken@2713
   641
{
slouken@2713
   642
    if (!ValidHaptic(haptic)) {
slouken@2713
   643
        return -1;
slouken@2713
   644
    }
slouken@2713
   645
slouken@2713
   646
    if ((haptic->supported & SDL_HAPTIC_AUTOCENTER) == 0) {
slouken@2713
   647
        SDL_SetError("Haptic: Device does not support setting autocenter.");
slouken@2713
   648
        return -1;
slouken@2713
   649
    }
slouken@2713
   650
slouken@2713
   651
    if ((autocenter < 0) || (autocenter > 100)) {
slouken@2713
   652
        SDL_SetError("Haptic: Autocenter must be between 0 and 100.");
slouken@2713
   653
        return -1;
slouken@2713
   654
    }
slouken@2713
   655
slouken@2713
   656
    if (SDL_SYS_HapticSetAutocenter(haptic, autocenter) < 0) {
slouken@2713
   657
        return -1;
slouken@2713
   658
    }
slouken@2713
   659
slouken@2713
   660
    return 0;
slouken@2713
   661
}
slouken@2713
   662
slouken@2713
   663
/*
slouken@2713
   664
 * Pauses the haptic device.
slouken@2713
   665
 */
slouken@2713
   666
int
slouken@2713
   667
SDL_HapticPause(SDL_Haptic * haptic)
slouken@2713
   668
{
slouken@2713
   669
    if (!ValidHaptic(haptic)) {
slouken@2713
   670
        return -1;
slouken@2713
   671
    }
slouken@2713
   672
slouken@2713
   673
    if ((haptic->supported & SDL_HAPTIC_PAUSE) == 0) {
slouken@2713
   674
        SDL_SetError("Haptic: Device does not support setting pausing.");
slouken@2713
   675
        return -1;
slouken@2713
   676
    }
slouken@2713
   677
slouken@2713
   678
    return SDL_SYS_HapticPause(haptic);
slouken@2713
   679
}
slouken@2713
   680
slouken@2713
   681
/*
slouken@2713
   682
 * Unpauses the haptic device.
slouken@2713
   683
 */
slouken@2713
   684
int
slouken@2713
   685
SDL_HapticUnpause(SDL_Haptic * haptic)
slouken@2713
   686
{
slouken@2713
   687
    if (!ValidHaptic(haptic)) {
slouken@2713
   688
        return -1;
slouken@2713
   689
    }
slouken@2713
   690
slouken@2713
   691
    if ((haptic->supported & SDL_HAPTIC_PAUSE) == 0) {
slouken@2713
   692
        return 0;               /* Not going to be paused, so we pretend it's unpaused. */
slouken@2713
   693
    }
slouken@2713
   694
slouken@2713
   695
    return SDL_SYS_HapticUnpause(haptic);
slouken@2713
   696
}
slouken@2713
   697
slouken@2713
   698
/*
slouken@2713
   699
 * Stops all the currently playing effects.
slouken@2713
   700
 */
slouken@2713
   701
int
slouken@2713
   702
SDL_HapticStopAll(SDL_Haptic * haptic)
slouken@2713
   703
{
slouken@2713
   704
    if (!ValidHaptic(haptic)) {
slouken@2713
   705
        return -1;
slouken@2713
   706
    }
slouken@2713
   707
slouken@2713
   708
    return SDL_SYS_HapticStopAll(haptic);
slouken@2713
   709
}
slouken@5360
   710
slouken@5362
   711
static void
slouken@5360
   712
SDL_HapticRumbleCreate(SDL_HapticEffect * efx)
slouken@5360
   713
{
slouken@5360
   714
   SDL_memset(efx, 0, sizeof(SDL_HapticEffect));
slouken@5360
   715
   efx->type = SDL_HAPTIC_SINE;
slouken@5360
   716
   efx->periodic.period = 1000;
slouken@5360
   717
   efx->periodic.magnitude = 0x4000;
slouken@5360
   718
   efx->periodic.length = 5000;
slouken@5360
   719
   efx->periodic.attack_length = 0;
slouken@5360
   720
   efx->periodic.fade_length = 0;
slouken@5360
   721
}
slouken@5360
   722
slouken@5360
   723
/*
slouken@5360
   724
 * Checks to see if rumble is supported.
slouken@5360
   725
 */
slouken@5360
   726
int
slouken@5360
   727
SDL_HapticRumbleSupported(SDL_Haptic * haptic)
slouken@5360
   728
{
slouken@5360
   729
    SDL_HapticEffect efx;
slouken@5360
   730
slouken@5360
   731
    if (!ValidHaptic(haptic)) {
slouken@5360
   732
        return -1;
slouken@5360
   733
    }
slouken@5360
   734
slouken@5360
   735
    SDL_HapticRumbleCreate(&efx);
slouken@5360
   736
    return SDL_HapticEffectSupported(haptic, &efx);
slouken@5360
   737
}
slouken@5360
   738
slouken@5360
   739
/*
slouken@5360
   740
 * Initializes the haptic device for simple rumble playback.
slouken@5360
   741
 */
slouken@5360
   742
int
slouken@5360
   743
SDL_HapticRumbleInit(SDL_Haptic * haptic)
slouken@5360
   744
{
slouken@5360
   745
    if (!ValidHaptic(haptic)) {
slouken@5360
   746
        return -1;
slouken@5360
   747
    }
slouken@5360
   748
slouken@5360
   749
    /* Already allocated. */
slouken@5360
   750
    if (haptic->rumble_id >= 0) {
slouken@5360
   751
        return 0;
slouken@5360
   752
    }
slouken@5360
   753
slouken@5360
   754
    /* Copy over. */
slouken@5360
   755
    SDL_HapticRumbleCreate(&haptic->rumble_effect);
slouken@5360
   756
    haptic->rumble_id = SDL_HapticNewEffect(haptic, &haptic->rumble_effect);
slouken@5360
   757
    if (haptic->rumble_id >= 0) {
slouken@5360
   758
        return 0;
slouken@5360
   759
    }
slouken@5360
   760
    return -1;
slouken@5360
   761
}
slouken@5360
   762
slouken@5360
   763
/*
slouken@5360
   764
 * Runs simple rumble on a haptic device
slouken@5360
   765
 */
slouken@5360
   766
int
slouken@5360
   767
SDL_HapticRumblePlay(SDL_Haptic * haptic, float strength, Uint32 length)
slouken@5360
   768
{
slouken@5360
   769
    SDL_HapticPeriodic *efx;
slouken@5360
   770
slouken@5360
   771
    if (!ValidHaptic(haptic)) {
slouken@5360
   772
        return -1;
slouken@5360
   773
    }
slouken@5360
   774
slouken@5360
   775
    if (haptic->rumble_id < 0) {
slouken@5360
   776
        SDL_SetError("Haptic: Rumble effect not initialized on haptic device");
slouken@5360
   777
        return -1;
slouken@5360
   778
    }
slouken@5360
   779
slouken@5360
   780
    /* Clamp strength. */
slouken@5360
   781
    if (strength > 1.0f) {
slouken@5360
   782
        strength = 1.0f;
slouken@5360
   783
    }
slouken@5360
   784
    else if (strength < 0.0f) {
slouken@5360
   785
        strength = 0.0f;
slouken@5360
   786
    }
slouken@5360
   787
slouken@5360
   788
    /* New effect. */
slouken@5360
   789
    efx = &haptic->rumble_effect.periodic;
slouken@5360
   790
    efx->magnitude = (Sint16)(32767.0f*strength);
slouken@5360
   791
    efx->length = length;
icculus@6389
   792
    SDL_HapticUpdateEffect(haptic, haptic->rumble_id, &haptic->rumble_effect);
slouken@5360
   793
slouken@5360
   794
    return SDL_HapticRunEffect(haptic, haptic->rumble_id, 1);
slouken@5360
   795
}
slouken@5360
   796
slouken@5360
   797
/*
slouken@5360
   798
 * Stops the simple rumble on a haptic device.
slouken@5360
   799
 */
slouken@5360
   800
int
slouken@5360
   801
SDL_HapticRumbleStop(SDL_Haptic * haptic)
slouken@5360
   802
{
slouken@5360
   803
    if (!ValidHaptic(haptic)) {
slouken@5360
   804
        return -1;
slouken@5360
   805
    }
slouken@5360
   806
slouken@5360
   807
    if (haptic->rumble_id < 0) {
slouken@5360
   808
        SDL_SetError("Haptic: Rumble effect not initialized on haptic device");
slouken@5360
   809
        return -1;
slouken@5360
   810
    }
slouken@5360
   811
slouken@5360
   812
    return SDL_HapticStopEffect(haptic, haptic->rumble_id);
slouken@5360
   813
}
slouken@5360
   814
slouken@5360
   815