~sircmpwn/kmscube

kmscube/drm-legacy.c -rw-r--r-- 3.4 KiB
090120d7Drew DeVault Update drm lease protocol 11 months ago
                                                                                
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/*
 * Copyright (c) 2017 Rob Clark <rclark@redhat.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sub license,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include <errno.h>
#include <stdio.h>
#include <string.h>

#include "common.h"
#include "drm-common.h"

static void page_flip_handler(int fd, unsigned int frame,
		  unsigned int sec, unsigned int usec, void *data)
{
	/* suppress 'unused parameter' warnings */
	(void)fd, (void)frame, (void)sec, (void)usec;

	int *waiting_for_flip = data;
	*waiting_for_flip = 0;
}

static int legacy_run(struct drm *drm, const struct gbm *gbm, struct egl *egl)
{
	fd_set fds;
	drmEventContext evctx = {
			.version = DRM_EVENT_CONTEXT_VERSION,
			.page_flip_handler = page_flip_handler,
	};
	struct gbm_bo *bo;
	struct drm_fb *fb;
	uint32_t i = 0;
	int ret;

	FD_ZERO(&fds);
	FD_SET(0, &fds);
	FD_SET(drm->fd, &fds);

	eglSwapBuffers(egl->display, egl->surface);
	bo = gbm_surface_lock_front_buffer(gbm->surface);
	fb = drm_fb_get_from_bo(bo);

	/* set mode: */
	ret = drmModeSetCrtc(drm->fd, drm->crtc_id, fb->fb_id, 0, 0,
			&drm->connector_id, 1, drm->mode);
	if (ret) {
		printf("failed to set mode: %s\n", strerror(errno));
                exit(0);
		return ret;
	}

	while (1) {
		struct gbm_bo *next_bo;
		int waiting_for_flip = 1;

		egl->draw(egl, i++);

		eglSwapBuffers(egl->display, egl->surface);
		next_bo = gbm_surface_lock_front_buffer(gbm->surface);
		fb = drm_fb_get_from_bo(next_bo);

		/*
		 * Here you could also update drm plane layers if you want
		 * hw composition
		 */

		ret = drmModePageFlip(drm->fd, drm->crtc_id, fb->fb_id,
				DRM_MODE_PAGE_FLIP_EVENT, &waiting_for_flip);
		if (ret) {
			printf("failed to queue page flip: %s\n", strerror(errno));
			return -1;
		}

		while (waiting_for_flip) {
			ret = select(drm->fd + 1, &fds, NULL, NULL, NULL);
			if (ret < 0) {
				printf("select err: %s\n", strerror(errno));
				return ret;
			} else if (ret == 0) {
				printf("select timeout!\n");
				return -1;
			} else if (FD_ISSET(0, &fds)) {
				printf("user interrupted!\n");
				break;
			}
			drmHandleEvent(drm->fd, &evctx);
		}

		/* release last buffer to render on again: */
		gbm_surface_release_buffer(gbm->surface, bo);
		bo = next_bo;
	}

	return 0;
}

struct drm * init_drm_legacy(int fd, int nfd)
{
	int ret;
        struct drm *drm = calloc (1, sizeof (struct drm));

	ret = init_drm(drm, fd, nfd);
	if (ret)
		return NULL;

	drm->run = legacy_run;

	return drm;
}