Merge pull request #4570 from german77/motionInput

input_common: Add a basic class for motion devices
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bunnei 2020-09-02 11:09:18 -04:00 committed by GitHub
commit f64917a852
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4 changed files with 276 additions and 0 deletions

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@ -36,6 +36,36 @@ public:
T length = std::sqrt(xyz.Length2() + w * w);
return {xyz / length, w / length};
}
[[nodiscard]] std::array<decltype(-T{}), 16> ToMatrix() const {
const T x2 = xyz[0] * xyz[0];
const T y2 = xyz[1] * xyz[1];
const T z2 = xyz[2] * xyz[2];
const T xy = xyz[0] * xyz[1];
const T wz = w * xyz[2];
const T xz = xyz[0] * xyz[2];
const T wy = w * xyz[1];
const T yz = xyz[1] * xyz[2];
const T wx = w * xyz[0];
return {1.0f - 2.0f * (y2 + z2),
2.0f * (xy + wz),
2.0f * (xz - wy),
0.0f,
2.0f * (xy - wz),
1.0f - 2.0f * (x2 + z2),
2.0f * (yz + wx),
0.0f,
2.0f * (xz + wy),
2.0f * (yz - wx),
1.0f - 2.0f * (x2 + y2),
0.0f,
0.0f,
0.0f,
0.0f,
1.0f};
}
};
template <typename T>

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@ -7,6 +7,8 @@ add_library(input_common STATIC
main.h
motion_emu.cpp
motion_emu.h
motion_input.cpp
motion_input.h
settings.cpp
settings.h
touch_from_button.cpp

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@ -0,0 +1,176 @@
#include "input_common/motion_input.h"
namespace InputCommon {
MotionInput::MotionInput(f32 new_kp, f32 new_ki, f32 new_kd)
: kp(new_kp), ki(new_ki), kd(new_kd), quat{{0, 0, -1}, 0} {}
void MotionInput::SetAcceleration(const Common::Vec3f& acceleration) {
accel = acceleration;
}
void MotionInput::SetGyroscope(const Common::Vec3f& gyroscope) {
gyro = gyroscope - gyro_drift;
if (gyro.Length2() < gyro_threshold) {
gyro = {};
}
}
void MotionInput::SetQuaternion(const Common::Quaternion<f32>& quaternion) {
quat = quaternion;
}
void MotionInput::SetGyroDrift(const Common::Vec3f& drift) {
gyro_drift = drift;
}
void MotionInput::SetGyroThreshold(f32 threshold) {
gyro_threshold = threshold;
}
void MotionInput::EnableReset(bool reset) {
reset_enabled = reset;
}
void MotionInput::ResetRotations() {
rotations = {};
}
bool MotionInput::IsMoving(f32 sensitivity) const {
return gyro.Length() >= sensitivity || accel.Length() <= 0.9f || accel.Length() >= 1.1f;
}
bool MotionInput::IsCalibrated(f32 sensitivity) const {
return real_error.Length() < sensitivity;
}
void MotionInput::UpdateRotation(u64 elapsed_time) {
const f32 sample_period = elapsed_time / 1000000.0f;
if (sample_period > 0.1f) {
return;
}
rotations += gyro * sample_period;
}
void MotionInput::UpdateOrientation(u64 elapsed_time) {
if (!IsCalibrated(0.1f)) {
ResetOrientation();
}
// Short name local variable for readability
f32 q1 = quat.w;
f32 q2 = quat.xyz[0];
f32 q3 = quat.xyz[1];
f32 q4 = quat.xyz[2];
const f32 sample_period = elapsed_time / 1000000.0f;
// ignore invalid elapsed time
if (sample_period > 0.1f) {
return;
}
const auto normal_accel = accel.Normalized();
auto rad_gyro = gyro * 3.1415926535f * 2;
const f32 swap = rad_gyro.x;
rad_gyro.x = rad_gyro.y;
rad_gyro.y = -swap;
rad_gyro.z = -rad_gyro.z;
// Ignore drift correction if acceleration is not reliable
if (accel.Length() >= 0.75f && accel.Length() <= 1.25f) {
const f32 ax = -normal_accel.x;
const f32 ay = normal_accel.y;
const f32 az = -normal_accel.z;
// Estimated direction of gravity
const f32 vx = 2.0f * (q2 * q4 - q1 * q3);
const f32 vy = 2.0f * (q1 * q2 + q3 * q4);
const f32 vz = q1 * q1 - q2 * q2 - q3 * q3 + q4 * q4;
// Error is cross product between estimated direction and measured direction of gravity
const Common::Vec3f new_real_error = {az * vx - ax * vz, ay * vz - az * vy,
ax * vy - ay * vx};
derivative_error = new_real_error - real_error;
real_error = new_real_error;
// Prevent integral windup
if (ki != 0.0f && !IsCalibrated(0.05f)) {
integral_error += real_error;
} else {
integral_error = {};
}
// Apply feedback terms
rad_gyro += kp * real_error;
rad_gyro += ki * integral_error;
rad_gyro += kd * derivative_error;
}
const f32 gx = rad_gyro.y;
const f32 gy = rad_gyro.x;
const f32 gz = rad_gyro.z;
// Integrate rate of change of quaternion
const f32 pa = q2;
const f32 pb = q3;
const f32 pc = q4;
q1 = q1 + (-q2 * gx - q3 * gy - q4 * gz) * (0.5f * sample_period);
q2 = pa + (q1 * gx + pb * gz - pc * gy) * (0.5f * sample_period);
q3 = pb + (q1 * gy - pa * gz + pc * gx) * (0.5f * sample_period);
q4 = pc + (q1 * gz + pa * gy - pb * gx) * (0.5f * sample_period);
quat.w = q1;
quat.xyz[0] = q2;
quat.xyz[1] = q3;
quat.xyz[2] = q4;
quat = quat.Normalized();
}
std::array<Common::Vec3f, 3> MotionInput::GetOrientation() const {
const Common::Quaternion<float> quad{
.xyz = {-quat.xyz[1], -quat.xyz[0], -quat.w},
.w = -quat.xyz[2],
};
const std::array<float, 16> matrix4x4 = quad.ToMatrix();
return {Common::Vec3f(matrix4x4[0], matrix4x4[1], -matrix4x4[2]),
Common::Vec3f(matrix4x4[4], matrix4x4[5], -matrix4x4[6]),
Common::Vec3f(-matrix4x4[8], -matrix4x4[9], matrix4x4[10])};
}
Common::Vec3f MotionInput::GetAcceleration() const {
return accel;
}
Common::Vec3f MotionInput::GetGyroscope() const {
return gyro;
}
Common::Quaternion<f32> MotionInput::GetQuaternion() const {
return quat;
}
Common::Vec3f MotionInput::GetRotations() const {
return rotations;
}
void MotionInput::ResetOrientation() {
if (!reset_enabled) {
return;
}
if (!IsMoving(0.5f) && accel.z <= -0.9f) {
++reset_counter;
if (reset_counter > 900) {
// TODO: calculate quaternion from gravity vector
quat.w = 0;
quat.xyz[0] = 0;
quat.xyz[1] = 0;
quat.xyz[2] = -1;
integral_error = {};
reset_counter = 0;
}
} else {
reset_counter = 0;
}
}
} // namespace InputCommon

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@ -0,0 +1,68 @@
// Copyright 2014 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#pragma once
#include "common/common_types.h"
#include "common/quaternion.h"
#include "common/vector_math.h"
namespace InputCommon {
class MotionInput {
public:
MotionInput(f32 new_kp, f32 new_ki, f32 new_kd);
MotionInput(const MotionInput&) = default;
MotionInput& operator=(const MotionInput&) = default;
MotionInput(MotionInput&&) = default;
MotionInput& operator=(MotionInput&&) = default;
void SetAcceleration(const Common::Vec3f& acceleration);
void SetGyroscope(const Common::Vec3f& acceleration);
void SetQuaternion(const Common::Quaternion<f32>& quaternion);
void SetGyroDrift(const Common::Vec3f& drift);
void SetGyroThreshold(f32 threshold);
void EnableReset(bool reset);
void ResetRotations();
void UpdateRotation(u64 elapsed_time);
void UpdateOrientation(u64 elapsed_time);
std::array<Common::Vec3f, 3> GetOrientation() const;
Common::Vec3f GetAcceleration() const;
Common::Vec3f GetGyroscope() const;
Common::Vec3f GetRotations() const;
Common::Quaternion<f32> GetQuaternion() const;
bool IsMoving(f32 sensitivity) const;
bool IsCalibrated(f32 sensitivity) const;
private:
void ResetOrientation();
// PID constants
const f32 kp;
const f32 ki;
const f32 kd;
// PID errors
Common::Vec3f real_error;
Common::Vec3f integral_error;
Common::Vec3f derivative_error;
Common::Quaternion<f32> quat;
Common::Vec3f rotations;
Common::Vec3f accel;
Common::Vec3f gyro;
Common::Vec3f gyro_drift;
f32 gyro_threshold = 0.0f;
u32 reset_counter = 0;
bool reset_enabled = true;
};
} // namespace InputCommon