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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.h"
static struct drm drm;
static void page_flip_handler(int fd, unsigned int frame,
unsigned int sec, unsigned int usec, void *data)
{
int *waiting_for_flip = data;
*waiting_for_flip = 0;
}
static int legacy_run(const struct gbm *gbm, const 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));
return ret;
}
while (1) {
struct gbm_bo *next_bo;
int waiting_for_flip = 1;
egl->draw(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;
}
const struct drm * init_drm_legacy(const char *device)
{
int ret;
ret = init_drm(&drm, device);
if (ret)
return NULL;
drm.run = legacy_run;
return &drm;
}
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