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#include "survive_imu.h"
#include "linmath.h"
#include "survive_internal.h"
#include <survive_imu.h>
void survive_imu_tracker_set_pose(SurviveIMUTracker *tracker, SurvivePose *pose) { tracker->pose = *pose; }
static const int imu_calibration_iterations = 100;
static void RotateAccel(LinmathVec3d rAcc, const SurvivePose *pose, const LinmathVec3d accel) {
quatrotatevector(rAcc, pose->Rot, accel);
scale3d(rAcc, rAcc, 2.);
LinmathVec3d G = {0, 0, -1};
add3d(rAcc, rAcc, G);
}
static SurvivePose iterate_position(const SurvivePose *pose, const LinmathVec3d vel, double time_diff,
const PoserDataIMU *pIMU) {
SurvivePose result = *pose;
FLT acc_mul = time_diff * time_diff / 2;
LinmathVec3d rAcc = {0};
RotateAccel(rAcc, pose, pIMU->accel);
scale3d(rAcc, rAcc, acc_mul);
LinmathVec3d gyro;
for (int i = 0; i < 3; i++) {
result.Pos[i] += time_diff * vel[i] + rAcc[i] * 9.8;
gyro[i] = time_diff / 2 * pIMU->gyro[i];
}
LinmathEulerAngle curr, next;
quattoeuler(curr, pose->Rot);
add3d(next, curr, gyro);
quatfromeuler(result.Rot, next);
return result;
}
static void iterate_velocity(LinmathVec3d result, const SurvivePose *pose, const LinmathVec3d vel, double time_diff,
PoserDataIMU *pIMU) {
scale3d(result, vel, .99999);
LinmathVec3d rAcc = {0};
RotateAccel(rAcc, pose, pIMU->accel);
scale3d(rAcc, rAcc, time_diff);
add3d(result, result, rAcc);
}
void survive_imu_tracker_integrate(SurviveObject *so, SurviveIMUTracker *tracker, PoserDataIMU *data) {
if (tracker->last_data.timecode == 0) {
if (tracker->last_data.datamask == imu_calibration_iterations) {
tracker->last_data = *data;
return;
}
tracker->last_data.datamask++;
tracker->updir[0] += data->accel[0] / imu_calibration_iterations;
tracker->updir[1] += data->accel[1] / imu_calibration_iterations;
tracker->updir[2] += data->accel[2] / imu_calibration_iterations;
return;
}
for (int i = 0; i < 3; i++) {
tracker->updir[i] = data->accel[i] * .10 + tracker->updir[i] * .90;
}
FLT up[3] = {0, 0, 1};
FLT pose_up[3] = {0, 0, 1};
quatrotatevector(pose_up, tracker->pose.Rot, tracker->updir);
FLT time_diff = (data->timecode - tracker->last_data.timecode) / (FLT)so->timebase_hz;
SurvivePose t_next = iterate_position(&tracker->pose, tracker->current_velocity, time_diff, data);
LinmathVec3d v_next;
iterate_velocity(v_next, &tracker->pose, tracker->current_velocity, time_diff, data);
tracker->pose = t_next;
scale3d(tracker->current_velocity, v_next, 1);
tracker->last_data = *data;
FLT tmp[3];
ApplyPoseToPoint(tmp, &tracker->pose, up);
printf("[%f, %f, %f] [%f, %f, %f]\n", tracker->pose.Pos[0], tracker->pose.Pos[1], tracker->pose.Pos[2], tmp[0],
tmp[1], tmp[2]);
}
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