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ipc: Use wait helper to implement wait frame

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Jakob Bornecrantz 2022-09-02 22:14:07 +01:00 committed by Ryan Pavlik
parent a0d63d2f9c
commit 1772baa90e
1 changed files with 16 additions and 38 deletions
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54
src/xrt/ipc/client/ipc_client_compositor.c
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@ -11,12 +11,14 @@
#include "xrt/xrt_device.h"
#include "xrt/xrt_compositor.h"
#include "xrt/xrt_defines.h"
#include "util/u_misc.h"
#include "util/u_trace_marker.h"
#include "xrt/xrt_config_os.h"
#include "os/os_time.h"
#include "util/u_wait.h"
#include "util/u_misc.h"
#include "util/u_trace_marker.h"
#include "shared/ipc_protocol.h"
#include "client/ipc_client.h"
#include "ipc_client_generated.h"
@ -70,6 +72,9 @@ struct ipc_client_compositor
//! Has the native compositor been created, only supports one for now.
bool compositor_created;
//! To get better wake up in wait frame.
struct os_precise_sleeper sleeper;
#ifdef IPC_USE_LOOPBACK_IMAGE_ALLOCATOR
//! To test image allocator.
struct xrt_image_native_allocator loopback_xina;
@ -508,44 +513,12 @@ ipc_compositor_wait_frame(struct xrt_compositor *xc,
out_predicted_display_time, // Display time
out_predicted_display_period)); // Current period
uint64_t now_ns = os_monotonic_get_ns();
// Lets hope its not to late.
if (wake_up_time_ns <= now_ns) {
res = ipc_call_compositor_wait_woke(icc->ipc_c, *out_frame_id);
return res;
}
const uint64_t _1ms_in_ns = 1000 * 1000;
const uint64_t measured_scheduler_latency_ns = 50 * 1000;
// Within one ms, just release the app right now.
if (wake_up_time_ns - _1ms_in_ns <= now_ns) {
res = ipc_call_compositor_wait_woke(icc->ipc_c, *out_frame_id);
return res;
}
// This is how much we should sleep.
uint64_t diff_ns = wake_up_time_ns - now_ns;
// A minor tweak that helps achieve the timing better.
diff_ns -= measured_scheduler_latency_ns;
os_nanosleep(diff_ns);
// Wait until the given wake up time.
u_wait_until(&icc->sleeper, wake_up_time_ns);
// Signal that we woke up.
res = ipc_call_compositor_wait_woke(icc->ipc_c, *out_frame_id);
#if 0
uint64_t then_ns = now_ns;
now_ns = os_monotonic_get_ns();
diff_ns = now_ns - then_ns;
uint64_t ms100 = diff_ns / (1000 * 10);
U_LOG_D("%s: Slept %i.%02ims", __func__, (int)ms100 / 100,
(int)ms100 % 100);
#endif
return res;
}
@ -799,6 +772,8 @@ ipc_compositor_destroy(struct xrt_compositor *xc)
IPC_CALL_CHK(ipc_call_session_destroy(icc->ipc_c));
os_precise_sleeper_deinit(&icc->sleeper);
icc->compositor_created = false;
}
@ -827,6 +802,9 @@ ipc_compositor_init(struct ipc_client_compositor *icc, struct xrt_compositor_nat
icc->base.base.destroy = ipc_compositor_destroy;
icc->base.base.poll_events = ipc_compositor_poll_events;
// Using in wait frame.
os_precise_sleeper_init(&icc->sleeper);
// Fetch info from the compositor, among it the format format list.
get_info(&(icc->base.base), &icc->base.base.info);