void
NativeStateDRM::flip()
{
gbm_bo* next = gbm_surface_lock_front_buffer(surface_);
fb_ = fb_get_from_bo(next);
unsigned int waiting(1);
if (!crtc_set_) {
int status = drmModeSetCrtc(fd_, encoder_->crtc_id, fb_->fb_id, 0, 0,
&connector_->connector_id, 1, mode_);
if (status >= 0) {
crtc_set_ = true;
bo_ = next;
}
else {
Log::error("Failed to set crtc: %d\n", status);
}
return;
}
int status = drmModePageFlip(fd_, encoder_->crtc_id, fb_->fb_id,
DRM_MODE_PAGE_FLIP_EVENT, &waiting);
if (status < 0) {
Log::error("Failed to enqueue page flip: %d\n", status);
return;
}
fd_set fds;
FD_ZERO(&fds);
FD_SET(fd_, &fds);
drmEventContext evCtx;
evCtx.version = DRM_EVENT_CONTEXT_VERSION;
evCtx.page_flip_handler = page_flip_handler;
while (waiting) {
status = select(fd_ + 1, &fds, 0, 0, 0);
if (status < 0) {
// Most of the time, select() will return an error because the
// user pressed Ctrl-C. So, only print out a message in debug
// mode, and just check for the likely condition and release
// the current buffer object before getting out.
Log::debug("Error in select\n");
if (should_quit()) {
gbm_surface_release_buffer(surface_, bo_);
bo_ = next;
}
return;
}
drmHandleEvent(fd_, &evCtx);
}
gbm_surface_release_buffer(surface_, bo_);
bo_ = next;
}
static bool gfx_ctx_drm_wait_flip(bool block)
{
int timeout = 0;
if (!waiting_for_flip)
return false;
if (block)
timeout = -1;
while (waiting_for_flip)
{
if (!drm_wait_flip(timeout))
break;
}
if (waiting_for_flip)
return true;
/* Page flip has taken place. */
/* This buffer is not on-screen anymore. Release it to GBM. */
gbm_surface_release_buffer(g_gbm_surface, g_bo);
/* This buffer is being shown now. */
g_bo = g_next_bo;
return false;
}
static void wait_flip(bool block)
{
struct pollfd fds = {0};
fds.fd = g_drm_fd;
fds.events = POLLIN;
drmEventContext evctx = {0};
evctx.version = DRM_EVENT_CONTEXT_VERSION;
evctx.page_flip_handler = page_flip_handler;
int timeout = block ? -1 : 0;
while (waiting_for_flip)
{
fds.revents = 0;
if (poll(&fds, 1, timeout) < 0)
break;
if (fds.revents & (POLLHUP | POLLERR))
break;
if (fds.revents & POLLIN)
drmHandleEvent(g_drm_fd, &evctx);
else
break;
}
if (!waiting_for_flip) // Page flip has taken place.
{
gbm_surface_release_buffer(g_gbm_surface, g_bo); // This buffer is not on-screen anymore. Release it to GBM.
g_bo = g_next_bo; // This buffer is being shown now.
}
}
void QEglFSKmsGbmScreen::flip()
{
if (!m_gbm_surface) {
qWarning("Cannot sync before platform init!");
return;
}
m_gbm_bo_next = gbm_surface_lock_front_buffer(m_gbm_surface);
if (!m_gbm_bo_next) {
qWarning("Could not lock GBM surface front buffer!");
return;
}
FrameBuffer *fb = framebufferForBufferObject(m_gbm_bo_next);
QKmsOutput &op(output());
const int fd = device()->fd();
const uint32_t w = op.modes[op.mode].hdisplay;
const uint32_t h = op.modes[op.mode].vdisplay;
if (!op.mode_set) {
int ret = drmModeSetCrtc(fd,
op.crtc_id,
fb->fb,
0, 0,
&op.connector_id, 1,
&op.modes[op.mode]);
if (ret == -1) {
qErrnoWarning(errno, "Could not set DRM mode!");
} else {
op.mode_set = true;
setPowerState(PowerStateOn);
if (!op.plane_set) {
op.plane_set = true;
if (op.wants_plane) {
int ret = drmModeSetPlane(fd, op.plane_id, op.crtc_id,
uint32_t(-1), 0,
0, 0, w, h,
0 << 16, 0 << 16, w << 16, h << 16);
if (ret == -1)
qErrnoWarning(errno, "drmModeSetPlane failed");
}
}
}
}
int ret = drmModePageFlip(fd,
op.crtc_id,
fb->fb,
DRM_MODE_PAGE_FLIP_EVENT,
this);
if (ret) {
qErrnoWarning("Could not queue DRM page flip!");
gbm_surface_release_buffer(m_gbm_surface, m_gbm_bo_next);
m_gbm_bo_next = Q_NULLPTR;
}
}
void QKmsScreen::handlePageFlipped()
{
if (m_current_bo)
gbm_surface_release_buffer(m_gbmSurface, m_current_bo);
m_current_bo = m_next_bo;
m_next_bo = 0;
}
void QEglFSKmsGbmScreen::flipFinished()
{
if (m_gbm_bo_current)
gbm_surface_release_buffer(m_gbm_surface,
m_gbm_bo_current);
m_gbm_bo_current = m_gbm_bo_next;
m_gbm_bo_next = Q_NULLPTR;
}
void RenderingBackendGBM::Surface::releaseBuffer(uint32_t handle)
{
auto it = m_lockedBuffers.find(handle);
assert(it != m_lockedBuffers.end());
struct gbm_bo* bo = it->second;
if (bo)
gbm_surface_release_buffer(m_surface, bo);
}
static void
free_current_bo(struct gbm_context *context)
{
if (context->current_fb_id) {
drmModeRmFB(context->dev->fd, context->current_fb_id);
context->current_fb_id = 0;
}
if (context->current_bo) {
gbm_surface_release_buffer(context->gbm_surface,
context->current_bo);
context->current_bo = NULL;
}
}
static void
page_flip_handler(int fd, unsigned int frame,
unsigned int sec, unsigned int usec, void *data)
{
if (current_fb_id)
drmModeRmFB(fd, current_fb_id);
current_fb_id = next_fb_id;
next_fb_id = 0;
if (current_bo)
gbm_surface_release_buffer(gs, current_bo);
current_bo = next_bo;
next_bo = NULL;
}
void QKmsScreen::performPageFlip()
{
if (!m_next_bo)
return;
uint32_t width = gbm_bo_get_width(m_next_bo);
uint32_t height = gbm_bo_get_height(m_next_bo);
uint32_t stride = gbm_bo_get_stride(m_next_bo);
uint32_t handle = gbm_bo_get_handle(m_next_bo).u32;
uint32_t fb_id;
int ret = drmModeAddFB(m_device->fd(), width, height, 24, 32,
stride, handle, &fb_id);
if (ret) {
qFatal("kms: Failed to create fb: fd %d, w %d, h %d, stride %d, handle %d, ret %d",
m_device->fd(), width, height, stride, handle, ret);
}
if (!m_modeSet) {
//Set the Mode of the screen.
int ret = drmModeSetCrtc(m_device->fd(), m_crtcId, fb_id,
0, 0, &m_connectorId, 1, &m_mode);
if (ret)
qFatal("failed to set mode");
m_modeSet = true;
// Initialize cursor
static int hideCursor = qgetenv("QT_QPA_KMS_HIDECURSOR").toInt();
if (!hideCursor) {
QCursor cursor(Qt::ArrowCursor);
m_cursor->changeCursor(&cursor, 0);
}
}
int pageFlipStatus = drmModePageFlip(m_device->fd(), m_crtcId,
fb_id,
DRM_MODE_PAGE_FLIP_EVENT, this);
if (pageFlipStatus)
{
qWarning("Pageflip status: %d", pageFlipStatus);
gbm_surface_release_buffer(m_gbmSurface, m_next_bo);
m_next_bo = 0;
}
}
static void wait_flip(bool block)
{
int timeout = 0;
struct pollfd fds = {0};
drmEventContext evctx = {0};
driver_t *driver = driver_get_ptr();
gfx_ctx_drm_egl_data_t *drm = (gfx_ctx_drm_egl_data_t*)
driver->video_context_data;
fds.fd = drm->g_drm_fd;
fds.events = POLLIN;
evctx.version = DRM_EVENT_CONTEXT_VERSION;
evctx.page_flip_handler = page_flip_handler;
if (block)
timeout = -1;
while (waiting_for_flip)
{
fds.revents = 0;
if (poll(&fds, 1, timeout) < 0)
break;
if (fds.revents & (POLLHUP | POLLERR))
break;
if (fds.revents & POLLIN)
drmHandleEvent(drm->g_drm_fd, &evctx);
else
break;
}
if (waiting_for_flip)
return;
/* Page flip has taken place. */
/* This buffer is not on-screen anymore. Release it to GBM. */
gbm_surface_release_buffer(drm->g_gbm_surface, drm->g_bo);
/* This buffer is being shown now. */
drm->g_bo = drm->g_next_bo;
}
bool CDRMLegacy::WaitingForFlip()
{
if(!flip_happening)
{
return false;
}
m_drm_fds.fd = m_drm->fd;
m_drm_fds.events = POLLIN;
m_drm_evctx.version = DRM_EVENT_CONTEXT_VERSION;
m_drm_evctx.page_flip_handler = PageFlipHandler;
m_drm_fds.revents = 0;
while(flip_happening)
{
auto ret = poll(&m_drm_fds, 1, -1);
if(ret < 0)
{
return true;
}
if(m_drm_fds.revents & (POLLHUP | POLLERR))
{
return true;
}
if(m_drm_fds.revents & POLLIN)
{
drmHandleEvent(m_drm->fd, &m_drm_evctx);
}
}
gbm_surface_release_buffer(m_gbm->surface, m_bo);
m_bo = m_next_bo;
return false;
}
int DRM_PageFlip(void){
int ret;
struct gbm_bo *next_bo;
int waiting_for_flip = 1;
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) {
//Aquí realmente no nos interesa leer el teclado. Sólo
//hacemos el select para esperar por drm.fd
FD_ZERO (&fds);
FD_SET (0, &fds);
FD_SET (drm.fd, &fds);
ret = select(drm.fd+1, &fds, NULL, NULL, NULL);
drmHandleEvent(drm.fd, &evctx);
}
/* release last buffer to render on again: */
gbm_surface_release_buffer(gbm.surface, bo);
bo = next_bo;
return 0;
}
bool CDRMLegacy::SetVideoMode(RESOLUTION_INFO res)
{
gbm_surface_release_buffer(m_gbm->surface, m_bo);
m_bo = gbm_surface_lock_front_buffer(m_gbm->surface);
m_drm_fb = CDRMUtils::DrmFbGetFromBo(m_bo);
auto ret = drmModeSetCrtc(m_drm->fd,
m_drm->crtc_id,
m_drm_fb->fb_id,
0,
0,
&m_drm->connector_id,
1,
m_drm->mode);
if(ret < 0)
{
CLog::Log(LOGERROR,
"CDRMUtils::%s - failed to set crtc mode: %dx%d%s @ %d Hz",
__FUNCTION__,
m_drm->mode->hdisplay,
m_drm->mode->vdisplay,
m_drm->mode->flags & DRM_MODE_FLAG_INTERLACE ? "i" : "",
m_drm->mode->vrefresh);
return false;
}
CLog::Log(LOGDEBUG, "CDRMUtils::%s - set crtc mode: %dx%d%s @ %d Hz",
__FUNCTION__,
m_drm->mode->hdisplay,
m_drm->mode->vdisplay,
m_drm->mode->flags & DRM_MODE_FLAG_INTERLACE ? "i" : "",
m_drm->mode->vrefresh);
return true;
}
static void
free_current_bo (CoglOnscreen *onscreen)
{
CoglOnscreenEGL *egl_onscreen = onscreen->winsys;
CoglOnscreenKMS *kms_onscreen = egl_onscreen->platform;
CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
CoglRenderer *renderer = context->display->renderer;
CoglRendererEGL *egl_renderer = renderer->winsys;
CoglRendererKMS *kms_renderer = egl_renderer->platform;
if (kms_onscreen->current_fb_id)
{
drmModeRmFB (kms_renderer->fd,
kms_onscreen->current_fb_id);
kms_onscreen->current_fb_id = 0;
}
if (kms_onscreen->current_bo)
{
gbm_surface_release_buffer (kms_onscreen->surface,
kms_onscreen->current_bo);
kms_onscreen->current_bo = NULL;
}
}
static void
_cogl_winsys_onscreen_swap_buffers (CoglOnscreen *onscreen)
{
CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
CoglDisplayEGL *egl_display = context->display->winsys;
CoglDisplayKMS *kms_display = egl_display->platform;
CoglRenderer *renderer = context->display->renderer;
CoglRendererEGL *egl_renderer = renderer->winsys;
CoglRendererKMS *kms_renderer = egl_renderer->platform;
CoglOnscreenEGL *egl_onscreen = onscreen->winsys;
CoglOnscreenKMS *kms_onscreen = egl_onscreen->platform;
uint32_t handle, stride;
CoglFlipKMS *flip;
GList *l;
/* If we already have a pending swap then block until it completes */
while (kms_onscreen->next_fb_id != 0)
handle_drm_event (kms_renderer);
/* First chain-up. This will call eglSwapBuffers */
parent_vtable->onscreen_swap_buffers (onscreen);
/* Now we need to set the CRTC to whatever is the front buffer */
kms_onscreen->next_bo = gbm_surface_lock_front_buffer (kms_onscreen->surface);
#if (COGL_VERSION_ENCODE (COGL_GBM_MAJOR, COGL_GBM_MINOR, COGL_GBM_MICRO) >= \
COGL_VERSION_ENCODE (8, 1, 0))
stride = gbm_bo_get_stride (kms_onscreen->next_bo);
#else
stride = gbm_bo_get_pitch (kms_onscreen->next_bo);
#endif
handle = gbm_bo_get_handle (kms_onscreen->next_bo).u32;
if (drmModeAddFB (kms_renderer->fd,
kms_display->width,
kms_display->height,
24, /* depth */
32, /* bpp */
stride,
handle,
&kms_onscreen->next_fb_id))
{
g_warning ("Failed to create new back buffer handle: %m");
gbm_surface_release_buffer (kms_onscreen->surface,
kms_onscreen->next_bo);
kms_onscreen->next_bo = NULL;
kms_onscreen->next_fb_id = 0;
return;
}
/* If this is the first framebuffer to be presented then we now setup the
* crtc modes... */
if (kms_display->pending_set_crtc)
{
setup_crtc_modes (context->display, kms_onscreen->next_fb_id);
kms_display->pending_set_crtc = FALSE;
}
flip = g_slice_new0 (CoglFlipKMS);
flip->onscreen = onscreen;
for (l = kms_display->outputs; l; l = l->next)
{
CoglOutputKMS *output = l->data;
if (drmModePageFlip (kms_renderer->fd,
output->encoder->crtc_id,
kms_onscreen->next_fb_id,
DRM_MODE_PAGE_FLIP_EVENT,
flip))
{
g_warning ("Failed to flip: %m");
continue;
}
flip->pending++;
}
if (flip->pending == 0)
{
drmModeRmFB (kms_renderer->fd, kms_onscreen->next_fb_id);
gbm_surface_release_buffer (kms_onscreen->surface,
kms_onscreen->next_bo);
kms_onscreen->next_bo = NULL;
kms_onscreen->next_fb_id = 0;
g_slice_free (CoglFlipKMS, flip);
flip = NULL;
}
else
{
/* Ensure the onscreen remains valid while it has any pending flips... */
cogl_object_ref (flip->onscreen);
}
}
int main(int argc, char *argv[])
{
struct opt_data opts; optproc(argc, argv, &opts);
if(audio_init(&opts) < 0) exit(1);
if(opts.w < 0 && opts.h < 0) opts.w = opts.h = 512;
else if(opts.w < 0) opts.w = opts.h;
else if(opts.h < 0) opts.h = opts.w;
int ret;
ret = init_drm(&opts, 512);
if (ret) {
printf("failed to initialize DRM\n");
return ret;
}
ret = init_gbm();
if (ret) {
printf("failed to initialize GBM\n");
return ret;
}
ret = init_egl();
if (ret) {
printf("failed to initialize EGL\n");
return ret;
}
// call init_gl
//init_gl(&opts, drm.mode->hdisplay, drm.mode->vdisplay);
init_gl(&opts, opts.w, opts.h); //TODO: better dealing with our great big screen
eglSwapBuffers(gl.display, gl.surface);
struct gbm_bo *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;
}
// turn off line buffering on input and echoing of characters
struct termios term;
tcgetattr(STDIN_FILENO, &save_term);
tcgetattr(STDIN_FILENO, &term);
term.c_lflag &= ~(ICANON|ECHO);
tcsetattr(STDIN_FILENO, TCSANOW, &term);
atexit(shutdown_cleanup);
drmVBlank vbl;
/* Get current count first hopefully also sync up with blank too*/
vbl.request.type = DRM_VBLANK_RELATIVE;
vbl.request.sequence = 1;
ret = drmWaitVBlank(drm.fd, &vbl);
if (ret != 0) {
printf("drmWaitVBlank (relative, event) failed ret: %i\n", ret);
return -1;
}
printf("starting msc: %d\n", vbl.request.sequence);
/* Queue an event for frame + 1 */
vbl.request.type = DRM_VBLANK_RELATIVE | DRM_VBLANK_EVENT;
vbl.request.sequence = 1;
vbl.request.signal = NULL;
ret = drmWaitVBlank(drm.fd, &vbl);
if (ret != 0) {
printf("drmWaitVBlank (relative, event) failed ret: %i\n", ret);
return -1;
}
struct pollfd pfds[] = {
{drm.fd, POLLIN | POLLPRI, 0 },
{STDIN_FILENO, POLLIN, 0 },
};
int debug_maxsrc = 0, debug_pal = 0, show_mandel = 0, show_fps_hist = 0;
bool done = false;
while (!done) {
render_frame(debug_maxsrc, debug_pal, show_mandel, show_fps_hist);
while (waiting_for_flip) { // TODO: input handling
ret = poll(pfds, 2, -1);
if (ret < 0) {
printf("poll err: %s\n", strerror(errno));
return ret;
} else if (ret == 0) {
printf("poll timeout!\n");
done = true;
break;
}
if (pfds[1].revents) {
char buf[128];
int cnt = read(STDIN_FILENO, buf, sizeof(buf));
if(buf[0] == 27) done = true;
else if(buf[0] == '1') debug_maxsrc = !debug_maxsrc;
else if(buf[0] == '2') debug_pal = !debug_pal;
else if(buf[0] == '3') show_mandel = !show_mandel;
else if(buf[0] == '4') show_fps_hist = !show_fps_hist;
//continue;
}
if(pfds[0].revents)
drmHandleEvent(drm.fd, &evctx);
}
/* release last buffer to render on again: */
gbm_surface_release_buffer(gbm.surface, bo);
bo = next_bo;
}
audio_shutdown();
return ret;
}
static int atomic_run(const struct gbm *gbm, const struct egl *egl)
{
struct gbm_bo *bo = NULL;
struct drm_fb *fb;
uint32_t i = 0;
uint32_t flags = DRM_MODE_ATOMIC_NONBLOCK;
struct timeval timeout;
fd_set fds;
int ret;
if (egl_check(egl, eglDupNativeFenceFDANDROID) ||
egl_check(egl, eglCreateSyncKHR) ||
egl_check(egl, eglDestroySyncKHR) ||
egl_check(egl, eglWaitSyncKHR) ||
egl_check(egl, eglClientWaitSyncKHR))
return -1;
/* Allow a modeset change for the first commit only. */
flags |= DRM_MODE_ATOMIC_ALLOW_MODESET;
while (1) {
struct gbm_bo *next_bo;
EGLSyncKHR gpu_fence = NULL; /* out-fence from gpu, in-fence to kms */
EGLSyncKHR kms_fence = NULL; /* in-fence to gpu, out-fence from kms */
if (drm.kms_out_fence_fd != -1) {
kms_fence = create_fence(egl, drm.kms_out_fence_fd);
assert(kms_fence);
/* driver now has ownership of the fence fd: */
drm.kms_out_fence_fd = -1;
/* wait "on the gpu" (ie. this won't necessarily block, but
* will block the rendering until fence is signaled), until
* the previous pageflip completes so we don't render into
* the buffer that is still on screen.
*/
egl->eglWaitSyncKHR(egl->display, kms_fence, 0);
}
egl->draw(i++);
/* insert fence to be singled in cmdstream.. this fence will be
* signaled when gpu rendering done
*/
gpu_fence = create_fence(egl, EGL_NO_NATIVE_FENCE_FD_ANDROID);
assert(gpu_fence);
eglSwapBuffers(egl->display, egl->surface);
/* after swapbuffers, gpu_fence should be flushed, so safe
* to get fd:
*/
drm.kms_in_fence_fd = egl->eglDupNativeFenceFDANDROID(egl->display, gpu_fence);
egl->eglDestroySyncKHR(egl->display, gpu_fence);
assert(drm.kms_in_fence_fd != -1);
next_bo = gbm_surface_lock_front_buffer(gbm->surface);
if (!next_bo) {
printf("Failed to lock frontbuffer\n");
return -1;
}
fb = drm_fb_get_from_bo(next_bo);
if (!fb) {
printf("Failed to get a new framebuffer BO\n");
return -1;
}
if (kms_fence) {
EGLint status;
/* Wait on the CPU side for the _previous_ commit to
* complete before we post the flip through KMS, as
* atomic will reject the commit if we post a new one
* whilst the previous one is still pending.
*/
do {
status = egl->eglClientWaitSyncKHR(egl->display,
kms_fence,
0,
EGL_FOREVER_KHR);
} while (status != EGL_CONDITION_SATISFIED_KHR);
egl->eglDestroySyncKHR(egl->display, kms_fence);
}
/*
* Here you could also update drm plane layers if you want
* hw composition
*/
ret = drm_atomic_commit(fb->fb_id, flags);
if (ret) {
printf("failed to commit: %s\n", strerror(errno));
return -1;
}
/* release last buffer to render on again: */
if (bo)
gbm_surface_release_buffer(gbm->surface, bo);
bo = next_bo;
/* Allow a modeset change for the first commit only. */
flags &= ~(DRM_MODE_ATOMIC_ALLOW_MODESET);
/* watch for user interruption */
FD_ZERO(&fds);
FD_SET(0, &fds);
memset(&timeout, 0, sizeof(timeout));
ret = select(1, &fds, NULL, NULL, &timeout);
if (ret < 0) {
printf("select() failed: %s\n", strerror(errno));
break;
}
/*
* select() will immediately timeout if there was no user
* interrupt because of the 0 timeout. However, that's an
* expected situation, not an error, so we just ignore it
* here.
*/
if (FD_ISSET(0, &fds)) {
printf("user interrupted!\n");
break;
}
}
return ret;
}
int init_egl_drm()
{
fd_set fds;
drmEventContext evctx = {
.version = DRM_EVENT_CONTEXT_VERSION,
.vblank_handler = 0,
.page_flip_handler = page_flip_handler,
};
struct gbm_bo *bo;
struct drm_fb *fb;
ret = init_drm();
if (ret) {
printf("failed to initialize DRM\n");
return ret;
}
printf("### Primary display => ConnectorId = %d, Resolution = %dx%d\n",
drm.connector_id[DISP_ID], drm.mode[DISP_ID]->hdisplay,
drm.mode[DISP_ID]->vdisplay);
FD_ZERO(&fds);
FD_SET(drm.fd, &fds);
ret = init_gbm();
if (ret) {
printf("failed to initialize GBM\n");
return ret;
}
//Initialise egl regularly here
}
void egl_drm_draw_flip()
{
/* set mode: */
if (all_display) {
for (i=0; i<drm.ndisp; i++) {
ret = drmModeSetCrtc(drm.fd, drm.crtc_id[i], fb->fb_id, 0, 0,
&drm.connector_id[i], 1, drm.mode[i]);
if (ret) {
printf("display %d failed to set mode: %s\n", i, strerror(errno));
return ret;
}
}
} else {
ret = drmModeSetCrtc(drm.fd, drm.crtc_id[DISP_ID], fb->fb_id,
0, 0, &drm.connector_id[DISP_ID], 1, drm.mode[DISP_ID]);
if (ret) {
printf("display %d failed to set mode: %s\n", DISP_ID, strerror(errno));
return ret;
}
}
//Draw call here
//Swapping is involved
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[DISP_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)) {
continue;
}
drmHandleEvent(drm.fd, &evctx);
}
/* release last buffer to render on again: */
gbm_surface_release_buffer(gbm.surface, bo);
bo = next_bo;
}