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Added support for absolute mice with evdev

This commit is contained in:
Andre Barata 2023-06-30 16:23:01 +01:00 committed by Sam Lantinga
parent 8231278817
commit 9cd7cbe134
1 changed files with 53 additions and 5 deletions
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58
src/core/linux/SDL_evdev.c
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@ -105,6 +105,8 @@ typedef struct SDL_evdevlist_item
SDL_bool relative_mouse;
int mouse_x, mouse_y;
int mouse_wheel, mouse_hwheel;
int min_x, max_x, range_x;
int min_y, max_y, range_y;
struct SDL_evdevlist_item *next;
} SDL_evdevlist_item;
@ -391,7 +393,6 @@ void SDL_EVDEV_Poll(void)
}
item->touchscreen_data->slots[0].x = events[i].value;
} else if (!item->relative_mouse) {
/* FIXME: Normalize to input device's reported input range (EVIOCGABS) */
item->mouse_x = events[i].value;
}
break;
@ -402,7 +403,6 @@ void SDL_EVDEV_Poll(void)
}
item->touchscreen_data->slots[0].y = events[i].value;
} else if (!item->relative_mouse) {
/* FIXME: Normalize to input device's reported input range (EVIOCGABS) */
item->mouse_y = events[i].value;
}
break;
@ -448,10 +448,20 @@ void SDL_EVDEV_Poll(void)
switch (events[i].code) {
case SYN_REPORT:
/* Send mouse axis changes together to ensure consistency and reduce event processing overhead */
if (item->mouse_x != 0 || item->mouse_y != 0) {
SDL_SendMouseMotion(mouse->focus, (SDL_MouseID)item->fd, item->relative_mouse, item->mouse_x, item->mouse_y);
item->mouse_x = item->mouse_y = 0;
if (item->relative_mouse) {
if (item->mouse_x != 0 || item->mouse_y != 0) {
SDL_SendMouseMotion(mouse->focus, (SDL_MouseID)item->fd, item->relative_mouse, item->mouse_x, item->mouse_y);
item->mouse_x = item->mouse_y = 0;
}
} else if (item->range_x > 0 && item->range_y > 0) {
/* TODO: test with multiple display scenarios */
SDL_DisplayMode mode;
SDL_GetCurrentDisplayMode(0, &mode);
SDL_SendMouseMotion(mouse->focus, (SDL_MouseID)item->fd, item->relative_mouse,
(item->mouse_x - item->min_x) * mode.w / item->range_x,
(item->mouse_y - item->min_y) * mode.h / item->range_y);
}
if (item->mouse_wheel != 0 || item->mouse_hwheel != 0) {
SDL_SendMouseWheel(mouse->focus, (SDL_MouseID)item->fd,
item->mouse_hwheel / (item->high_res_hwheel ? 120.0f : 1.0f),
@ -643,6 +653,36 @@ static int SDL_EVDEV_init_touchscreen(SDL_evdevlist_item *item, int udev_class)
return 0;
}
static int SDL_EVDEV_init_mouse(SDL_evdevlist_item *item, int udev_class)
{
int ret;
struct input_absinfo abs_info;
if (item->is_touchscreen) {
return 0;
}
ret = ioctl(item->fd, EVIOCGABS(ABS_X), &abs_info);
if (ret < 0) {
// no absolute mode info, continue
return 0;
}
item->min_x = abs_info.minimum;
item->max_x = abs_info.maximum;
item->range_x = abs_info.maximum - abs_info.minimum;
ret = ioctl(item->fd, EVIOCGABS(ABS_Y), &abs_info);
if (ret < 0) {
// no absolute mode info, continue
return 0;
}
item->min_y = abs_info.minimum;
item->max_y = abs_info.maximum;
item->range_y = abs_info.maximum - abs_info.minimum;
return 0;
}
static void SDL_EVDEV_destroy_touchscreen(SDL_evdevlist_item *item)
{
if (!item->is_touchscreen) {
@ -827,6 +867,14 @@ static int SDL_EVDEV_device_added(const char *dev_path, int udev_class)
SDL_free(item);
return ret;
}
} else if (udev_class & SDL_UDEV_DEVICE_MOUSE) {
ret = SDL_EVDEV_init_mouse(item, udev_class);
if (ret < 0) {
close(item->fd);
SDL_free(item->path);
SDL_free(item);
return ret;
}
}
if (_this->last == NULL) {