| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| #include "SDL_config.h" |
| |
| #ifdef SDL_HAPTIC_LINUX |
| |
| #include "SDL_haptic.h" |
| #include "../SDL_syshaptic.h" |
| #include "SDL_joystick.h" |
| #include "../../joystick/SDL_sysjoystick.h" /* For the real SDL_Joystick */ |
| #include "../../joystick/linux/SDL_sysjoystick_c.h" /* For joystick hwdata */ |
| |
| #include <unistd.h> /* close */ |
| #include <linux/input.h> /* Force feedback linux stuff. */ |
| #include <fcntl.h> /* O_RDWR */ |
| #include <limits.h> /* INT_MAX */ |
| #include <errno.h> /* errno, strerror */ |
| #include <math.h> /* atan2 */ |
| #include <sys/stat.h> /* stat */ |
| |
| /* Just in case. */ |
| #ifndef M_PI |
| # define M_PI 3.14159265358979323846 |
| #endif |
| |
| |
| #define MAX_HAPTICS 32 /* It's doubtful someone has more then 32 evdev */ |
| |
| |
| /* |
| * List of available haptic devices. |
| */ |
| static struct |
| { |
| char *fname; /* Dev path name (like /dev/input/event1) */ |
| SDL_Haptic *haptic; /* Assosciated haptic. */ |
| } SDL_hapticlist[MAX_HAPTICS]; |
| |
| |
| /* |
| * Haptic system hardware data. |
| */ |
| struct haptic_hwdata |
| { |
| int fd; /* File descriptor of the device. */ |
| char *fname; /* Points to the name in SDL_hapticlist. */ |
| }; |
| |
| |
| /* |
| * Haptic system effect data. |
| */ |
| struct haptic_hweffect |
| { |
| struct ff_effect effect; /* The linux kernel effect structure. */ |
| }; |
| |
| |
| |
| #define test_bit(nr, addr) \ |
| (((1UL << ((nr) & 31)) & (((const unsigned int *) addr)[(nr) >> 5])) != 0) |
| #define EV_TEST(ev,f) \ |
| if (test_bit((ev), features)) ret |= (f); |
| /* |
| * Test whether a device has haptic properties. |
| * Returns available properties or 0 if there are none. |
| */ |
| static int |
| EV_IsHaptic(int fd) |
| { |
| unsigned int ret; |
| unsigned long features[1 + FF_MAX / sizeof(unsigned long)]; |
| |
| /* Ask device for what it has. */ |
| ret = 0; |
| if (ioctl(fd, EVIOCGBIT(EV_FF, sizeof(features)), features) < 0) { |
| return SDL_SetError("Haptic: Unable to get device's features: %s", |
| strerror(errno)); |
| } |
| |
| /* Convert supported features to SDL_HAPTIC platform-neutral features. */ |
| EV_TEST(FF_CONSTANT, SDL_HAPTIC_CONSTANT); |
| EV_TEST(FF_SINE, SDL_HAPTIC_SINE); |
| /* !!! FIXME: put this back when we have more bits in 2.1 */ |
| /*EV_TEST(FF_SQUARE, SDL_HAPTIC_SQUARE);*/ |
| EV_TEST(FF_TRIANGLE, SDL_HAPTIC_TRIANGLE); |
| EV_TEST(FF_SAW_UP, SDL_HAPTIC_SAWTOOTHUP); |
| EV_TEST(FF_SAW_DOWN, SDL_HAPTIC_SAWTOOTHDOWN); |
| EV_TEST(FF_RAMP, SDL_HAPTIC_RAMP); |
| EV_TEST(FF_SPRING, SDL_HAPTIC_SPRING); |
| EV_TEST(FF_FRICTION, SDL_HAPTIC_FRICTION); |
| EV_TEST(FF_DAMPER, SDL_HAPTIC_DAMPER); |
| EV_TEST(FF_INERTIA, SDL_HAPTIC_INERTIA); |
| EV_TEST(FF_CUSTOM, SDL_HAPTIC_CUSTOM); |
| EV_TEST(FF_GAIN, SDL_HAPTIC_GAIN); |
| EV_TEST(FF_AUTOCENTER, SDL_HAPTIC_AUTOCENTER); |
| EV_TEST(FF_RUMBLE, SDL_HAPTIC_LEFTRIGHT); |
| |
| /* Return what it supports. */ |
| return ret; |
| } |
| |
| |
| /* |
| * Tests whether a device is a mouse or not. |
| */ |
| static int |
| EV_IsMouse(int fd) |
| { |
| unsigned long argp[40]; |
| |
| /* Ask for supported features. */ |
| if (ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(argp)), argp) < 0) { |
| return -1; |
| } |
| |
| /* Currently we only test for BTN_MOUSE which can give fake positives. */ |
| if (test_bit(BTN_MOUSE, argp) != 0) { |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Initializes the haptic subsystem by finding available devices. |
| */ |
| int |
| SDL_SYS_HapticInit(void) |
| { |
| const char joydev_pattern[] = "/dev/input/event%d"; |
| dev_t dev_nums[MAX_HAPTICS]; |
| char path[PATH_MAX]; |
| struct stat sb; |
| int fd; |
| int i, j, k; |
| int duplicate; |
| int numhaptics; |
| |
| numhaptics = 0; |
| |
| /* |
| * Limit amount of checks to MAX_HAPTICS since we may or may not have |
| * permission to some or all devices. |
| */ |
| i = 0; |
| for (j = 0; j < MAX_HAPTICS; ++j) { |
| |
| snprintf(path, PATH_MAX, joydev_pattern, i++); |
| |
| /* check to see if file exists */ |
| if (stat(path, &sb) != 0) |
| break; |
| |
| /* check for duplicates */ |
| duplicate = 0; |
| for (k = 0; (k < numhaptics) && !duplicate; ++k) { |
| if (sb.st_rdev == dev_nums[k]) { |
| duplicate = 1; |
| } |
| } |
| if (duplicate) { |
| continue; |
| } |
| |
| /* try to open */ |
| fd = open(path, O_RDWR, 0); |
| if (fd < 0) |
| continue; |
| |
| #ifdef DEBUG_INPUT_EVENTS |
| printf("Checking %s\n", path); |
| #endif |
| |
| /* see if it works */ |
| if (EV_IsHaptic(fd) > 0) { |
| SDL_hapticlist[numhaptics].fname = SDL_strdup(path); |
| SDL_hapticlist[numhaptics].haptic = NULL; |
| dev_nums[numhaptics] = sb.st_rdev; |
| ++numhaptics; |
| } |
| close(fd); |
| } |
| |
| return numhaptics; |
| } |
| |
| |
| /* |
| * Gets the name from a file descriptor. |
| */ |
| static const char * |
| SDL_SYS_HapticNameFromFD(int fd) |
| { |
| static char namebuf[128]; |
| |
| /* We use the evdev name ioctl. */ |
| if (ioctl(fd, EVIOCGNAME(sizeof(namebuf)), namebuf) <= 0) { |
| return NULL; |
| } |
| |
| return namebuf; |
| } |
| |
| |
| /* |
| * Return the name of a haptic device, does not need to be opened. |
| */ |
| const char * |
| SDL_SYS_HapticName(int index) |
| { |
| int fd; |
| const char *name; |
| |
| /* Open the haptic device. */ |
| name = NULL; |
| fd = open(SDL_hapticlist[index].fname, O_RDONLY, 0); |
| |
| if (fd >= 0) { |
| |
| name = SDL_SYS_HapticNameFromFD(fd); |
| if (name == NULL) { |
| /* No name found, return device character device */ |
| name = SDL_hapticlist[index].fname; |
| } |
| } |
| close(fd); |
| |
| return name; |
| } |
| |
| |
| /* |
| * Opens the haptic device from the file descriptor. |
| */ |
| static int |
| SDL_SYS_HapticOpenFromFD(SDL_Haptic * haptic, int fd) |
| { |
| /* Allocate the hwdata */ |
| haptic->hwdata = (struct haptic_hwdata *) |
| SDL_malloc(sizeof(*haptic->hwdata)); |
| if (haptic->hwdata == NULL) { |
| SDL_OutOfMemory(); |
| goto open_err; |
| } |
| SDL_memset(haptic->hwdata, 0, sizeof(*haptic->hwdata)); |
| |
| /* Set the data. */ |
| haptic->hwdata->fd = fd; |
| haptic->supported = EV_IsHaptic(fd); |
| haptic->naxes = 2; /* Hardcoded for now, not sure if it's possible to find out. */ |
| |
| /* Set the effects */ |
| if (ioctl(fd, EVIOCGEFFECTS, &haptic->neffects) < 0) { |
| SDL_SetError("Haptic: Unable to query device memory: %s", |
| strerror(errno)); |
| goto open_err; |
| } |
| haptic->nplaying = haptic->neffects; /* Linux makes no distinction. */ |
| haptic->effects = (struct haptic_effect *) |
| SDL_malloc(sizeof(struct haptic_effect) * haptic->neffects); |
| if (haptic->effects == NULL) { |
| SDL_OutOfMemory(); |
| goto open_err; |
| } |
| /* Clear the memory */ |
| SDL_memset(haptic->effects, 0, |
| sizeof(struct haptic_effect) * haptic->neffects); |
| |
| return 0; |
| |
| /* Error handling */ |
| open_err: |
| close(fd); |
| if (haptic->hwdata != NULL) { |
| free(haptic->hwdata); |
| haptic->hwdata = NULL; |
| } |
| return -1; |
| } |
| |
| |
| /* |
| * Opens a haptic device for usage. |
| */ |
| int |
| SDL_SYS_HapticOpen(SDL_Haptic * haptic) |
| { |
| int fd; |
| int ret; |
| |
| /* Open the character device */ |
| fd = open(SDL_hapticlist[haptic->index].fname, O_RDWR, 0); |
| if (fd < 0) { |
| return SDL_SetError("Haptic: Unable to open %s: %s", |
| SDL_hapticlist[haptic->index], strerror(errno)); |
| } |
| |
| /* Try to create the haptic. */ |
| ret = SDL_SYS_HapticOpenFromFD(haptic, fd); /* Already closes on error. */ |
| if (ret < 0) { |
| return -1; |
| } |
| |
| /* Set the fname. */ |
| haptic->hwdata->fname = SDL_hapticlist[haptic->index].fname; |
| return 0; |
| } |
| |
| |
| /* |
| * Opens a haptic device from first mouse it finds for usage. |
| */ |
| int |
| SDL_SYS_HapticMouse(void) |
| { |
| int fd; |
| int i; |
| |
| for (i = 0; i < SDL_numhaptics; i++) { |
| |
| /* Open the device. */ |
| fd = open(SDL_hapticlist[i].fname, O_RDWR, 0); |
| if (fd < 0) { |
| return SDL_SetError("Haptic: Unable to open %s: %s", |
| SDL_hapticlist[i], strerror(errno)); |
| } |
| |
| /* Is it a mouse? */ |
| if (EV_IsMouse(fd)) { |
| close(fd); |
| return i; |
| } |
| |
| close(fd); |
| } |
| |
| return -1; |
| } |
| |
| |
| /* |
| * Checks to see if a joystick has haptic features. |
| */ |
| int |
| SDL_SYS_JoystickIsHaptic(SDL_Joystick * joystick) |
| { |
| return EV_IsHaptic(joystick->hwdata->fd); |
| } |
| |
| |
| /* |
| * Checks to see if the haptic device and joystick and in reality the same. |
| */ |
| int |
| SDL_SYS_JoystickSameHaptic(SDL_Haptic * haptic, SDL_Joystick * joystick) |
| { |
| /* We are assuming Linux is using evdev which should trump the old |
| * joystick methods. */ |
| if (SDL_strcmp(joystick->hwdata->fname, haptic->hwdata->fname) == 0) { |
| return 1; |
| } |
| return 0; |
| } |
| |
| |
| /* |
| * Opens a SDL_Haptic from a SDL_Joystick. |
| */ |
| int |
| SDL_SYS_HapticOpenFromJoystick(SDL_Haptic * haptic, SDL_Joystick * joystick) |
| { |
| int i; |
| int fd; |
| int ret; |
| |
| |
| /* Find the joystick in the haptic list. */ |
| for (i = 0; i < MAX_HAPTICS; i++) { |
| if (SDL_hapticlist[i].fname != NULL) { |
| if (SDL_strcmp(SDL_hapticlist[i].fname, joystick->hwdata->fname) |
| == 0) { |
| haptic->index = i; |
| break; |
| } |
| } |
| } |
| if (i >= MAX_HAPTICS) { |
| return SDL_SetError("Haptic: Joystick doesn't have Haptic capabilities"); |
| } |
| |
| fd = open(joystick->hwdata->fname, O_RDWR, 0); |
| if (fd < 0) { |
| return SDL_SetError("Haptic: Unable to open %s: %s", |
| joystick->hwdata->fname, strerror(errno)); |
| } |
| ret = SDL_SYS_HapticOpenFromFD(haptic, fd); /* Already closes on error. */ |
| if (ret < 0) { |
| return -1; |
| } |
| |
| haptic->hwdata->fname = SDL_hapticlist[haptic->index].fname; |
| return 0; |
| } |
| |
| |
| /* |
| * Closes the haptic device. |
| */ |
| void |
| SDL_SYS_HapticClose(SDL_Haptic * haptic) |
| { |
| if (haptic->hwdata) { |
| |
| /* Free effects. */ |
| SDL_free(haptic->effects); |
| haptic->effects = NULL; |
| haptic->neffects = 0; |
| |
| /* Clean up */ |
| close(haptic->hwdata->fd); |
| |
| /* Free */ |
| SDL_free(haptic->hwdata); |
| haptic->hwdata = NULL; |
| } |
| |
| /* Clear the rest. */ |
| SDL_memset(haptic, 0, sizeof(SDL_Haptic)); |
| } |
| |
| |
| /* |
| * Clean up after system specific haptic stuff |
| */ |
| void |
| SDL_SYS_HapticQuit(void) |
| { |
| int i; |
| |
| for (i = 0; SDL_hapticlist[i].fname != NULL; i++) { |
| /* Opened and not closed haptics are leaked, this is on purpose. |
| * Close your haptic devices after usage. */ |
| |
| SDL_free(SDL_hapticlist[i].fname); |
| } |
| SDL_hapticlist[0].fname = NULL; |
| } |
| |
| |
| /* |
| * Converts an SDL button to a ff_trigger button. |
| */ |
| static Uint16 |
| SDL_SYS_ToButton(Uint16 button) |
| { |
| Uint16 ff_button; |
| |
| ff_button = 0; |
| |
| /* |
| * Not sure what the proper syntax is because this actually isn't implemented |
| * in the current kernel from what I've seen (2.6.26). |
| */ |
| if (button != 0) { |
| ff_button = BTN_GAMEPAD + button - 1; |
| } |
| |
| return ff_button; |
| } |
| |
| |
| /* |
| * Returns the ff_effect usable direction from a SDL_HapticDirection. |
| */ |
| static Uint16 |
| SDL_SYS_ToDirection(SDL_HapticDirection * dir) |
| { |
| Uint32 tmp; |
| float f; /* Ideally we'd use fixed point math instead of floats... */ |
| |
| switch (dir->type) { |
| case SDL_HAPTIC_POLAR: |
| /* Linux directions start from south. |
| (and range from 0 to 0xFFFF) |
| Quoting include/linux/input.h, line 926: |
| Direction of the effect is encoded as follows: |
| 0 deg -> 0x0000 (down) |
| 90 deg -> 0x4000 (left) |
| 180 deg -> 0x8000 (up) |
| 270 deg -> 0xC000 (right) |
| */ |
| tmp = (((18000 + dir->dir[0]) % 36000) * 0xFFFF) / 36000; /* convert to range [0,0xFFFF] */ |
| return (Uint16) tmp; |
| |
| case SDL_HAPTIC_SPHERICAL: |
| /* |
| We convert to polar, because that's the only supported direction on Linux. |
| The first value of a spherical direction is practically the same as a |
| Polar direction, except that we have to add 90 degrees. It is the angle |
| from EAST {1,0} towards SOUTH {0,1}. |
| --> add 9000 |
| --> finally add 18000 and convert to [0,0xFFFF] as in case SDL_HAPTIC_POLAR. |
| */ |
| tmp = ((dir->dir[0]) + 9000) % 36000; /* Convert to polars */ |
| tmp = (((18000 + tmp) % 36000) * 0xFFFF) / 36000; /* convert to range [0,0xFFFF] */ |
| return (Uint16) tmp; |
| |
| case SDL_HAPTIC_CARTESIAN: |
| f = atan2(dir->dir[1], dir->dir[0]); |
| /* |
| atan2 takes the parameters: Y-axis-value and X-axis-value (in that order) |
| - Y-axis-value is the second coordinate (from center to SOUTH) |
| - X-axis-value is the first coordinate (from center to EAST) |
| We add 36000, because atan2 also returns negative values. Then we practically |
| have the first spherical value. Therefore we proceed as in case |
| SDL_HAPTIC_SPHERICAL and add another 9000 to get the polar value. |
| --> add 45000 in total |
| --> finally add 18000 and convert to [0,0xFFFF] as in case SDL_HAPTIC_POLAR. |
| */ |
| tmp = (((int) (f * 18000. / M_PI)) + 45000) % 36000; |
| tmp = (((18000 + tmp) % 36000) * 0xFFFF) / 36000; /* convert to range [0,0xFFFF] */ |
| return (Uint16) tmp; |
| |
| default: |
| return (Uint16) SDL_SetError("Haptic: Unsupported direction type."); |
| } |
| |
| return 0; |
| } |
| |
| |
| #define CLAMP(x) (((x) > 32767) ? 32767 : x) |
| /* |
| * Initializes the Linux effect struct from a haptic_effect. |
| * Values above 32767 (for unsigned) are unspecified so we must clamp. |
| */ |
| static int |
| SDL_SYS_ToFFEffect(struct ff_effect *dest, SDL_HapticEffect * src) |
| { |
| Uint32 tmp; |
| SDL_HapticConstant *constant; |
| SDL_HapticPeriodic *periodic; |
| SDL_HapticCondition *condition; |
| SDL_HapticRamp *ramp; |
| SDL_HapticLeftRight *leftright; |
| |
| /* Clear up */ |
| SDL_memset(dest, 0, sizeof(struct ff_effect)); |
| |
| switch (src->type) { |
| case SDL_HAPTIC_CONSTANT: |
| constant = &src->constant; |
| |
| /* Header */ |
| dest->type = FF_CONSTANT; |
| dest->direction = SDL_SYS_ToDirection(&constant->direction); |
| if (dest->direction == (Uint16) - 1) |
| return -1; |
| |
| /* Replay */ |
| dest->replay.length = (constant->length == SDL_HAPTIC_INFINITY) ? |
| 0 : CLAMP(constant->length); |
| dest->replay.delay = CLAMP(constant->delay); |
| |
| /* Trigger */ |
| dest->trigger.button = SDL_SYS_ToButton(constant->button); |
| dest->trigger.interval = CLAMP(constant->interval); |
| |
| /* Constant */ |
| dest->u.constant.level = constant->level; |
| |
| /* Envelope */ |
| dest->u.constant.envelope.attack_length = |
| CLAMP(constant->attack_length); |
| dest->u.constant.envelope.attack_level = |
| CLAMP(constant->attack_level); |
| dest->u.constant.envelope.fade_length = CLAMP(constant->fade_length); |
| dest->u.constant.envelope.fade_level = CLAMP(constant->fade_level); |
| |
| break; |
| |
| case SDL_HAPTIC_SINE: |
| /* !!! FIXME: put this back when we have more bits in 2.1 */ |
| /*case SDL_HAPTIC_SQUARE:*/ |
| case SDL_HAPTIC_TRIANGLE: |
| case SDL_HAPTIC_SAWTOOTHUP: |
| case SDL_HAPTIC_SAWTOOTHDOWN: |
| periodic = &src->periodic; |
| |
| /* Header */ |
| dest->type = FF_PERIODIC; |
| dest->direction = SDL_SYS_ToDirection(&periodic->direction); |
| if (dest->direction == (Uint16) - 1) |
| return -1; |
| |
| /* Replay */ |
| dest->replay.length = (periodic->length == SDL_HAPTIC_INFINITY) ? |
| 0 : CLAMP(periodic->length); |
| dest->replay.delay = CLAMP(periodic->delay); |
| |
| /* Trigger */ |
| dest->trigger.button = SDL_SYS_ToButton(periodic->button); |
| dest->trigger.interval = CLAMP(periodic->interval); |
| |
| /* Periodic */ |
| if (periodic->type == SDL_HAPTIC_SINE) |
| dest->u.periodic.waveform = FF_SINE; |
| /* !!! FIXME: put this back when we have more bits in 2.1 */ |
| /*else if (periodic->type == SDL_HAPTIC_SQUARE) |
| dest->u.periodic.waveform = FF_SQUARE;*/ |
| else if (periodic->type == SDL_HAPTIC_TRIANGLE) |
| dest->u.periodic.waveform = FF_TRIANGLE; |
| else if (periodic->type == SDL_HAPTIC_SAWTOOTHUP) |
| dest->u.periodic.waveform = FF_SAW_UP; |
| else if (periodic->type == SDL_HAPTIC_SAWTOOTHDOWN) |
| dest->u.periodic.waveform = FF_SAW_DOWN; |
| dest->u.periodic.period = CLAMP(periodic->period); |
| dest->u.periodic.magnitude = periodic->magnitude; |
| dest->u.periodic.offset = periodic->offset; |
| /* Phase is calculated based of offset from period and then clamped. */ |
| tmp = ((periodic->phase % 36000) * dest->u.periodic.period) / 36000; |
| dest->u.periodic.phase = CLAMP(tmp); |
| |
| /* Envelope */ |
| dest->u.periodic.envelope.attack_length = |
| CLAMP(periodic->attack_length); |
| dest->u.periodic.envelope.attack_level = |
| CLAMP(periodic->attack_level); |
| dest->u.periodic.envelope.fade_length = CLAMP(periodic->fade_length); |
| dest->u.periodic.envelope.fade_level = CLAMP(periodic->fade_level); |
| |
| break; |
| |
| case SDL_HAPTIC_SPRING: |
| case SDL_HAPTIC_DAMPER: |
| case SDL_HAPTIC_INERTIA: |
| case SDL_HAPTIC_FRICTION: |
| condition = &src->condition; |
| |
| /* Header */ |
| if (condition->type == SDL_HAPTIC_SPRING) |
| dest->type = FF_SPRING; |
| else if (condition->type == SDL_HAPTIC_DAMPER) |
| dest->type = FF_DAMPER; |
| else if (condition->type == SDL_HAPTIC_INERTIA) |
| dest->type = FF_INERTIA; |
| else if (condition->type == SDL_HAPTIC_FRICTION) |
| dest->type = FF_FRICTION; |
| dest->direction = 0; /* Handled by the condition-specifics. */ |
| |
| /* Replay */ |
| dest->replay.length = (condition->length == SDL_HAPTIC_INFINITY) ? |
| 0 : CLAMP(condition->length); |
| dest->replay.delay = CLAMP(condition->delay); |
| |
| /* Trigger */ |
| dest->trigger.button = SDL_SYS_ToButton(condition->button); |
| dest->trigger.interval = CLAMP(condition->interval); |
| |
| /* Condition */ |
| /* X axis */ |
| dest->u.condition[0].right_saturation = |
| CLAMP(condition->right_sat[0]); |
| dest->u.condition[0].left_saturation = CLAMP(condition->left_sat[0]); |
| dest->u.condition[0].right_coeff = condition->right_coeff[0]; |
| dest->u.condition[0].left_coeff = condition->left_coeff[0]; |
| dest->u.condition[0].deadband = CLAMP(condition->deadband[0]); |
| dest->u.condition[0].center = condition->center[0]; |
| /* Y axis */ |
| dest->u.condition[1].right_saturation = |
| CLAMP(condition->right_sat[1]); |
| dest->u.condition[1].left_saturation = CLAMP(condition->left_sat[1]); |
| dest->u.condition[1].right_coeff = condition->right_coeff[1]; |
| dest->u.condition[1].left_coeff = condition->left_coeff[1]; |
| dest->u.condition[1].deadband = CLAMP(condition->deadband[1]); |
| dest->u.condition[1].center = condition->center[1]; |
| |
| /* |
| * There is no envelope in the linux force feedback api for conditions. |
| */ |
| |
| break; |
| |
| case SDL_HAPTIC_RAMP: |
| ramp = &src->ramp; |
| |
| /* Header */ |
| dest->type = FF_RAMP; |
| dest->direction = SDL_SYS_ToDirection(&ramp->direction); |
| if (dest->direction == (Uint16) - 1) |
| return -1; |
| |
| /* Replay */ |
| dest->replay.length = (ramp->length == SDL_HAPTIC_INFINITY) ? |
| 0 : CLAMP(ramp->length); |
| dest->replay.delay = CLAMP(ramp->delay); |
| |
| /* Trigger */ |
| dest->trigger.button = SDL_SYS_ToButton(ramp->button); |
| dest->trigger.interval = CLAMP(ramp->interval); |
| |
| /* Ramp */ |
| dest->u.ramp.start_level = ramp->start; |
| dest->u.ramp.end_level = ramp->end; |
| |
| /* Envelope */ |
| dest->u.ramp.envelope.attack_length = CLAMP(ramp->attack_length); |
| dest->u.ramp.envelope.attack_level = CLAMP(ramp->attack_level); |
| dest->u.ramp.envelope.fade_length = CLAMP(ramp->fade_length); |
| dest->u.ramp.envelope.fade_level = CLAMP(ramp->fade_level); |
| |
| break; |
| |
| case SDL_HAPTIC_LEFTRIGHT: |
| leftright = &src->leftright; |
| |
| /* Header */ |
| dest->type = FF_RUMBLE; |
| dest->direction = 0; |
| |
| /* Replay */ |
| dest->replay.length = (leftright->length == SDL_HAPTIC_INFINITY) ? |
| 0 : CLAMP(leftright->length); |
| |
| /* Trigger */ |
| dest->trigger.button = 0; |
| dest->trigger.interval = 0; |
| |
| /* Rumble */ |
| dest->u.rumble.strong_magnitude = leftright->large_magnitude; |
| dest->u.rumble.weak_magnitude = leftright->small_magnitude; |
| |
| break; |
| |
| |
| default: |
| return SDL_SetError("Haptic: Unknown effect type."); |
| } |
| |
| return 0; |
| } |
| |
| |
| /* |
| * Creates a new haptic effect. |
| */ |
| int |
| SDL_SYS_HapticNewEffect(SDL_Haptic * haptic, struct haptic_effect *effect, |
| SDL_HapticEffect * base) |
| { |
| struct ff_effect *linux_effect; |
| |
| /* Allocate the hardware effect */ |
| effect->hweffect = (struct haptic_hweffect *) |
| SDL_malloc(sizeof(struct haptic_hweffect)); |
| if (effect->hweffect == NULL) { |
| return SDL_OutOfMemory(); |
| } |
| |
| /* Prepare the ff_effect */ |
| linux_effect = &effect->hweffect->effect; |
| if (SDL_SYS_ToFFEffect(linux_effect, base) != 0) { |
| goto new_effect_err; |
| } |
| linux_effect->id = -1; /* Have the kernel give it an id */ |
| |
| /* Upload the effect */ |
| if (ioctl(haptic->hwdata->fd, EVIOCSFF, linux_effect) < 0) { |
| SDL_SetError("Haptic: Error uploading effect to the device: %s", |
| strerror(errno)); |
| goto new_effect_err; |
| } |
| |
| return 0; |
| |
| new_effect_err: |
| free(effect->hweffect); |
| effect->hweffect = NULL; |
| return -1; |
| } |
| |
| |
| /* |
| * Updates an effect. |
| * |
| * Note: Dynamically updating the direction can in some cases force |
| * the effect to restart and run once. |
| */ |
| int |
| SDL_SYS_HapticUpdateEffect(SDL_Haptic * haptic, |
| struct haptic_effect *effect, |
| SDL_HapticEffect * data) |
| { |
| struct ff_effect linux_effect; |
| |
| /* Create the new effect */ |
| if (SDL_SYS_ToFFEffect(&linux_effect, data) != 0) { |
| return -1; |
| } |
| linux_effect.id = effect->hweffect->effect.id; |
| |
| /* See if it can be uploaded. */ |
| if (ioctl(haptic->hwdata->fd, EVIOCSFF, &linux_effect) < 0) { |
| return SDL_SetError("Haptic: Error updating the effect: %s", |
| strerror(errno)); |
| } |
| |
| /* Copy the new effect into memory. */ |
| SDL_memcpy(&effect->hweffect->effect, &linux_effect, |
| sizeof(struct ff_effect)); |
| |
| return effect->hweffect->effect.id; |
| } |
| |
| |
| /* |
| * Runs an effect. |
| */ |
| int |
| SDL_SYS_HapticRunEffect(SDL_Haptic * haptic, struct haptic_effect *effect, |
| Uint32 iterations) |
| { |
| struct input_event run; |
| |
| /* Prepare to run the effect */ |
| run.type = EV_FF; |
| run.code = effect->hweffect->effect.id; |
| /* We don't actually have infinity here, so we just do INT_MAX which is pretty damn close. */ |
| run.value = (iterations > INT_MAX) ? INT_MAX : iterations; |
| |
| if (write(haptic->hwdata->fd, (const void *) &run, sizeof(run)) < 0) { |
| return SDL_SetError("Haptic: Unable to run the effect: %s", strerror(errno)); |
| } |
| |
| return 0; |
| } |
| |
| |
| /* |
| * Stops an effect. |
| */ |
| int |
| SDL_SYS_HapticStopEffect(SDL_Haptic * haptic, struct haptic_effect *effect) |
| { |
| struct input_event stop; |
| |
| stop.type = EV_FF; |
| stop.code = effect->hweffect->effect.id; |
| stop.value = 0; |
| |
| if (write(haptic->hwdata->fd, (const void *) &stop, sizeof(stop)) < 0) { |
| return SDL_SetError("Haptic: Unable to stop the effect: %s", |
| strerror(errno)); |
| } |
| |
| return 0; |
| } |
| |
| |
| /* |
| * Frees the effect. |
| */ |
| void |
| SDL_SYS_HapticDestroyEffect(SDL_Haptic * haptic, struct haptic_effect *effect) |
| { |
| if (ioctl(haptic->hwdata->fd, EVIOCRMFF, effect->hweffect->effect.id) < 0) { |
| SDL_SetError("Haptic: Error removing the effect from the device: %s", |
| strerror(errno)); |
| } |
| SDL_free(effect->hweffect); |
| effect->hweffect = NULL; |
| } |
| |
| |
| /* |
| * Gets the status of a haptic effect. |
| */ |
| int |
| SDL_SYS_HapticGetEffectStatus(SDL_Haptic * haptic, |
| struct haptic_effect *effect) |
| { |
| #if 0 /* Not supported atm. */ |
| struct input_event ie; |
| |
| ie.type = EV_FF; |
| ie.type = EV_FF_STATUS; |
| ie.code = effect->hweffect->effect.id; |
| |
| if (write(haptic->hwdata->fd, &ie, sizeof(ie)) < 0) { |
| return SDL_SetError("Haptic: Error getting device status."); |
| } |
| |
| return 0; |
| #endif |
| |
| return -1; |
| } |
| |
| |
| /* |
| * Sets the gain. |
| */ |
| int |
| SDL_SYS_HapticSetGain(SDL_Haptic * haptic, int gain) |
| { |
| struct input_event ie; |
| |
| ie.type = EV_FF; |
| ie.code = FF_GAIN; |
| ie.value = (0xFFFFUL * gain) / 100; |
| |
| if (write(haptic->hwdata->fd, &ie, sizeof(ie)) < 0) { |
| return SDL_SetError("Haptic: Error setting gain: %s", strerror(errno)); |
| } |
| |
| return 0; |
| } |
| |
| |
| /* |
| * Sets the autocentering. |
| */ |
| int |
| SDL_SYS_HapticSetAutocenter(SDL_Haptic * haptic, int autocenter) |
| { |
| struct input_event ie; |
| |
| ie.type = EV_FF; |
| ie.code = FF_AUTOCENTER; |
| ie.value = (0xFFFFUL * autocenter) / 100; |
| |
| if (write(haptic->hwdata->fd, &ie, sizeof(ie)) < 0) { |
| return SDL_SetError("Haptic: Error setting autocenter: %s", strerror(errno)); |
| } |
| |
| return 0; |
| } |
| |
| |
| /* |
| * Pausing is not supported atm by linux. |
| */ |
| int |
| SDL_SYS_HapticPause(SDL_Haptic * haptic) |
| { |
| return -1; |
| } |
| |
| |
| /* |
| * Unpausing is not supported atm by linux. |
| */ |
| int |
| SDL_SYS_HapticUnpause(SDL_Haptic * haptic) |
| { |
| return -1; |
| } |
| |
| |
| /* |
| * Stops all the currently playing effects. |
| */ |
| int |
| SDL_SYS_HapticStopAll(SDL_Haptic * haptic) |
| { |
| int i, ret; |
| |
| /* Linux does not support this natively so we have to loop. */ |
| for (i = 0; i < haptic->neffects; i++) { |
| if (haptic->effects[i].hweffect != NULL) { |
| ret = SDL_SYS_HapticStopEffect(haptic, &haptic->effects[i]); |
| if (ret < 0) { |
| return SDL_SetError |
| ("Haptic: Error while trying to stop all playing effects."); |
| } |
| } |
| } |
| return 0; |
| } |
| |
| |
| #endif /* SDL_HAPTIC_LINUX */ |
