mirrors/monado
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/monado/monado.git synced 2024-12-29 11:06:18 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

comp: Add hack waiting on xrEndFrame() until frame should be displayed.

Browse source 
xrWaitFrame() doesn't block at all, will only predict the time for the next frame.
Once the compositor is multithreaded, this wait should be moved to the compositor thread
and xrWaitFrame should be the function to block until the compositor finished rendering the frame.
This commit is contained in:
Christoph Haag 2019-08-15 01:25:53 +02:00 committed by Jakob Bornecrantz
parent 3e34060777
commit 6e396ed07e
1 changed files with 15 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
src/xrt/compositor/main/comp_compositor.c
View file

@ -20,6 +20,7 @@
#include "main/comp_compositor.h"
#include "main/comp_client_interface.h"
#include <unistd.h>
static void
compositor_destroy(struct xrt_compositor *xc)
@ -119,6 +120,20 @@ compositor_end_frame(struct xrt_compositor *xc,
struct comp_swapchain_image *right;
struct comp_swapchain_image *left;
//! HACK: Wait until the frame is predicted to be displayed.
// This needs improvement, but blocks for plausible timings.
uint64_t now = time_state_get_now(c->timekeeping);
uint64_t already_used = now - c->last_frame_time_ns;
if (already_used < c->settings.nominal_frame_interval_ns) {
uint64_t remaining_usec =
(c->settings.nominal_frame_interval_ns - already_used) /
1000;
remaining_usec -= 500; // HACK: leave a bit of time for overhead
// printf("Remaining usec before this frame is displayed :
// %lu\n", remaining_usec);
usleep(remaining_usec);
}
// Stereo!
if (num_swapchains == 2) {
left = &comp_swapchain(xscs[0])->images[image_index[0]];