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d/wmr: Do prediction when returning poses

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This commit is contained in:
Jakob Bornecrantz 2021-04-23 14:59:18 +01:00
parent a41a869c71
commit 1b4b180e61
2 changed files with 35 additions and 7 deletions
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36
src/xrt/drivers/wmr/wmr_hmd.c
View file

@ -20,6 +20,7 @@
#include "math/m_mathinclude.h"
#include "math/m_api.h"
#include "math/m_vec2.h"
#include "math/m_predict.h"
#include "util/u_var.h"
#include "util/u_misc.h"
@ -140,7 +141,10 @@ hololens_sensors_read_packets(struct wmr_hmd *wh)
}
switch (buffer[0]) {
case WMR_MS_HOLOLENS_MSG_SENSORS:
case WMR_MS_HOLOLENS_MSG_SENSORS: {
// Get the timing as close to reading the packet as possible.
uint64_t now_ns = os_monotonic_get_ns();
hololens_sensors_decode_packet(wh, &wh->packet, buffer, size);
for (int i = 0; i < 4; i++) {
@ -148,6 +152,8 @@ hololens_sensors_read_packets(struct wmr_hmd *wh)
vec3_from_hololens_accel(wh->packet.accel, i, &wh->raw_accel);
os_mutex_lock(&wh->fusion.mutex);
wh->fusion.last_imu_timestamp_ns = now_ns;
wh->fusion.last_angular_velocity = wh->raw_gyro;
m_imu_3dof_update( //
&wh->fusion.i3dof, //
wh->packet.gyro_timestamp[i] * WMR_MS_HOLOLENS_NS_PER_TICK, //
@ -156,6 +162,7 @@ hololens_sensors_read_packets(struct wmr_hmd *wh)
os_mutex_unlock(&wh->fusion.mutex);
}
break;
}
case WMR_MS_HOLOLENS_MSG_UNKNOWN_05:
case WMR_MS_HOLOLENS_MSG_UNKNOWN_06:
case WMR_MS_HOLOLENS_MSG_UNKNOWN_0E: //
@ -370,16 +377,31 @@ wmr_hmd_get_tracked_pose(struct xrt_device *xdev,
return;
}
// Clear relation.
U_ZERO(out_relation);
// Variables needed for prediction.
uint64_t last_imu_timestamp_ns = 0;
struct xrt_space_relation relation = {0};
relation.relation_flags = (enum xrt_space_relation_flags)( //
XRT_SPACE_RELATION_ANGULAR_VELOCITY_VALID_BIT | //
XRT_SPACE_RELATION_ORIENTATION_VALID_BIT | //
XRT_SPACE_RELATION_ORIENTATION_TRACKED_BIT);
// Get data while holding the lock.
os_mutex_lock(&wh->fusion.mutex);
out_relation->pose.orientation = wh->fusion.i3dof.rot;
relation.pose.orientation = wh->fusion.i3dof.rot;
relation.angular_velocity = wh->fusion.last_angular_velocity;
last_imu_timestamp_ns = wh->fusion.last_imu_timestamp_ns;
os_mutex_unlock(&wh->fusion.mutex);
out_relation->relation_flags = (enum xrt_space_relation_flags)( //
XRT_SPACE_RELATION_ORIENTATION_VALID_BIT | //
XRT_SPACE_RELATION_ORIENTATION_TRACKED_BIT);
// No prediction needed.
if (at_timestamp_ns < last_imu_timestamp_ns) {
*out_relation = relation;
return;
}
uint64_t prediction_ns = at_timestamp_ns - last_imu_timestamp_ns;
double prediction_s = time_ns_to_s(prediction_ns);
m_predict_relation(&relation, prediction_s, out_relation);
}
static void

6
src/xrt/drivers/wmr/wmr_hmd.h
View file

@ -79,6 +79,12 @@ struct wmr_hmd
//! Main fusion calculator.
struct m_imu_3dof i3dof;
//! The last angular velocity from the IMU, for prediction.
struct xrt_vec3 last_angular_velocity;
//! When did we get the last IMU sample, in CPU time.
uint64_t last_imu_timestamp_ns;
} fusion;
struct