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Sort Steam virtual gamepads by Steam controller slot

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This makes sure that games launched by Steam see the first controller first, and the controllers in the game match up with the controllers in the Steam UI.

Fixes https://github.com/libsdl-org/SDL/issues/8672
This commit is contained in:
Sam Lantinga 2023-12-09 20:31:28 -08:00
parent f3d8a2def5
commit 17723381da
1 changed files with 101 additions and 14 deletions
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115
src/joystick/linux/SDL_sysjoystick.c
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@ -832,6 +832,104 @@ static int SDLCALL sort_entries(const void *_a, const void *_b)
return numA - numB;
}
typedef struct
{
char *path;
int slot;
} VirtualGamepadEntry;
static int SDLCALL sort_virtual_gamepads(const void *_a, const void *_b)
{
const VirtualGamepadEntry *a = (const VirtualGamepadEntry *)_a;
const VirtualGamepadEntry *b = (const VirtualGamepadEntry *)_b;
return a->slot - b->slot;
}
static SDL_bool get_virtual_gamepad_slot(const char *name, int *slot)
{
const char *digits = SDL_strstr(name, "pad ");
if (digits) {
digits += 4;
if (SDL_isdigit(*digits)) {
*slot = SDL_atoi(digits);
return SDL_TRUE;
}
}
return SDL_FALSE;
}
static void LINUX_ScanSteamVirtualGamepads(void)
{
int i, count;
int fd;
struct dirent **entries = NULL;
char path[PATH_MAX];
char name[128];
struct input_id inpid;
int num_virtual_gamepads = 0;
int virtual_gamepad_slot;
VirtualGamepadEntry *virtual_gamepads = NULL;
count = scandir("/dev/input", &entries, filter_entries, NULL);
for (i = 0; i < count; ++i) {
(void)SDL_snprintf(path, SDL_arraysize(path), "/dev/input/%s", entries[i]->d_name);
fd = open(path, O_RDONLY | O_CLOEXEC, 0);
if (fd >= 0) {
if (ioctl(fd, EVIOCGID, &inpid) == 0 &&
inpid.vendor == USB_VENDOR_VALVE &&
inpid.product == USB_PRODUCT_STEAM_VIRTUAL_GAMEPAD &&
ioctl(fd, EVIOCGNAME(sizeof(name)), name) > 0 &&
get_virtual_gamepad_slot(name, &virtual_gamepad_slot)) {
VirtualGamepadEntry *new_virtual_gamepads = (VirtualGamepadEntry *)SDL_realloc(virtual_gamepads, (num_virtual_gamepads + 1) * sizeof(*virtual_gamepads));
if (new_virtual_gamepads) {
VirtualGamepadEntry *entry = &new_virtual_gamepads[num_virtual_gamepads];
entry->path = SDL_strdup(path);
entry->slot = virtual_gamepad_slot;
if (entry->path) {
virtual_gamepads = new_virtual_gamepads;
++num_virtual_gamepads;
} else {
SDL_free(entry->path);
SDL_free(new_virtual_gamepads);
}
}
}
close(fd);
}
free(entries[i]); /* This should NOT be SDL_free() */
}
free(entries); /* This should NOT be SDL_free() */
if (num_virtual_gamepads > 1) {
SDL_qsort(virtual_gamepads, num_virtual_gamepads, sizeof(*virtual_gamepads), sort_virtual_gamepads);
}
for (i = 0; i < num_virtual_gamepads; ++i) {
MaybeAddDevice(virtual_gamepads[i].path);
SDL_free(virtual_gamepads[i].path);
}
SDL_free(virtual_gamepads);
}
static void LINUX_ScanInputDevices(void)
{
int i, count;
struct dirent **entries = NULL;
char path[PATH_MAX];
count = scandir("/dev/input", &entries, filter_entries, NULL);
if (count > 1) {
SDL_qsort(entries, count, sizeof(*entries), sort_entries);
}
for (i = 0; i < count; ++i) {
(void)SDL_snprintf(path, SDL_arraysize(path), "/dev/input/%s", entries[i]->d_name);
MaybeAddDevice(path);
free(entries[i]); /* This should NOT be SDL_free() */
}
free(entries); /* This should NOT be SDL_free() */
}
static void LINUX_FallbackJoystickDetect(void)
{
const Uint32 SDL_JOY_DETECT_INTERVAL_MS = 3000; /* Update every 3 seconds */
@ -842,21 +940,10 @@ static void LINUX_FallbackJoystickDetect(void)
/* Opening input devices can generate synchronous device I/O, so avoid it if we can */
if (stat("/dev/input", &sb) == 0 && sb.st_mtime != last_input_dir_mtime) {
int i, count;
struct dirent **entries = NULL;
char path[PATH_MAX];
/* Look for Steam virtual gamepads first, and sort by Steam controller slot */
LINUX_ScanSteamVirtualGamepads();
count = scandir("/dev/input", &entries, filter_entries, NULL);
if (count > 1) {
SDL_qsort(entries, count, sizeof(*entries), sort_entries);
}
for (i = 0; i < count; ++i) {
(void)SDL_snprintf(path, SDL_arraysize(path), "/dev/input/%s", entries[i]->d_name);
MaybeAddDevice(path);
free(entries[i]); /* This should NOT be SDL_free() */
}
free(entries); /* This should NOT be SDL_free() */
LINUX_ScanInputDevices();
last_input_dir_mtime = sb.st_mtime;
}