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92 lines
1.7 KiB
92 lines
1.7 KiB
#include "backend/drm/otd.h"
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#include "backend/drm/event.h"
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#include "backend/drm/drm.h"
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#include "backend/drm/udev.h"
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#include <stdbool.h>
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#include <stdlib.h>
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#include <poll.h>
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static inline void event_swap(struct otd_event *a, struct otd_event *b)
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{
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struct otd_event tmp = *a;
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*a = *b;
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*b = tmp;
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}
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bool otd_get_event(struct otd *otd, struct otd_event *restrict ret)
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{
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struct pollfd fds[] = {
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{ .fd = otd->fd, .events = POLLIN },
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{ .fd = otd->udev_fd, .events = POLLIN },
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};
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while (poll(fds, 2, 0) > 0) {
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if (fds[0].revents)
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get_drm_event(otd);
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if (fds[1].revents)
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otd_udev_event(otd);
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}
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if (otd->event_len == 0) {
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ret->type = OTD_EV_NONE;
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ret->display = NULL;
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return false;
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}
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struct otd_event *ev = otd->events;
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// Downheap
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*ret = ev[0];
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ev[0] = ev[--otd->event_len];
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size_t i = 0;
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while (i < otd->event_len / 2) {
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size_t left = i * 2 + 1;
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size_t right = i * 2 + 2;
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size_t max = (ev[left].type > ev[right].type) ? left : right;
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if (ev[i].type <= ev[max].type) {
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event_swap(&ev[i], &ev[max]);
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i = max;
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} else {
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break;
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}
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}
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return true;
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}
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bool event_add(struct otd *otd, struct otd_display *disp, enum otd_event_type type)
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{
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if (type == OTD_EV_NONE)
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return true;
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if (otd->event_len == otd->event_cap) {
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size_t new_size = (otd->event_cap == 0) ? 8 : otd->event_cap * 2;
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struct otd_event *new = realloc(otd->events, sizeof *new * new_size);
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if (!new) {
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return false;
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}
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otd->event_cap = new_size;
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otd->events = new;
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}
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struct otd_event *ev = otd->events;
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// Upheap
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size_t i = otd->event_len++;
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ev[i].type = type;
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ev[i].display = disp;
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size_t j;
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while (i > 0 && ev[i].type > ev[(j = (i - 1) / 2)].type) {
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event_swap(&ev[i], &ev[j]);
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i = j;
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}
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return true;
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}
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