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Diffstat (limited to 'LibOVR/Src/OVR_SensorImpl_Common.cpp')
| -rw-r--r-- | LibOVR/Src/OVR_SensorImpl_Common.cpp | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/LibOVR/Src/OVR_SensorImpl_Common.cpp b/LibOVR/Src/OVR_SensorImpl_Common.cpp new file mode 100644 index 0000000..99febe8 --- /dev/null +++ b/LibOVR/Src/OVR_SensorImpl_Common.cpp @@ -0,0 +1,245 @@ +/************************************************************************************ + +Filename : OVR_SensorImpl_Common.cpp +Content : Source common to SensorImpl and Sensor2Impl. +Created : January 21, 2014 +Authors : Lee Cooper + +Copyright : Copyright 2014 Oculus VR, Inc. All Rights reserved. + +Licensed under the Oculus VR Rift SDK License Version 3.1 (the "License"); +you may not use the Oculus VR Rift SDK except in compliance with the License, +which is provided at the time of installation or download, or which +otherwise accompanies this software in either electronic or hard copy form. + +You may obtain a copy of the License at + +http://www.oculusvr.com/licenses/LICENSE-3.1 + +Unless required by applicable law or agreed to in writing, the Oculus VR SDK +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. + +*************************************************************************************/ + +#include "OVR_SensorImpl_Common.h" +#include "Kernel/OVR_Alg.h" + +namespace OVR +{ + +void UnpackSensor(const UByte* buffer, SInt32* x, SInt32* y, SInt32* z) +{ + // Sign extending trick + // from http://graphics.stanford.edu/~seander/bithacks.html#FixedSignExtend + struct {SInt32 x:21;} s; + + *x = s.x = (buffer[0] << 13) | (buffer[1] << 5) | ((buffer[2] & 0xF8) >> 3); + *y = s.x = ((buffer[2] & 0x07) << 18) | (buffer[3] << 10) | (buffer[4] << 2) | + ((buffer[5] & 0xC0) >> 6); + *z = s.x = ((buffer[5] & 0x3F) << 15) | (buffer[6] << 7) | (buffer[7] >> 1); +} + +void PackSensor(UByte* buffer, SInt32 x, SInt32 y, SInt32 z) +{ + // Pack 3 32 bit integers into 8 bytes + buffer[0] = UByte(x >> 13); + buffer[1] = UByte(x >> 5); + buffer[2] = UByte((x << 3) | ((y >> 18) & 0x07)); + buffer[3] = UByte(y >> 10); + buffer[4] = UByte(y >> 2); + buffer[5] = UByte((y << 6) | ((z >> 15) & 0x3F)); + buffer[6] = UByte(z >> 7); + buffer[7] = UByte(z << 1); +} + +UInt16 SelectSensorRampValue(const UInt16* ramp, unsigned count, + float val, float factor, const char* label) +{ + UInt16 threshold = (UInt16)(val * factor); + + for (unsigned i = 0; i<count; i++) + { + if (ramp[i] >= threshold) + return ramp[i]; + } + OVR_DEBUG_LOG(("SensorDevice::SetRange - %s clamped to %0.4f", + label, float(ramp[count-1]) / factor)); + OVR_UNUSED2(factor, label); + return ramp[count-1]; +} + +SensorRangeImpl::SensorRangeImpl(const SensorRange& r, UInt16 commandId) +{ + SetSensorRange(r, commandId); +} + +void SensorRangeImpl::SetSensorRange(const SensorRange& r, UInt16 commandId) +{ + CommandId = commandId; + AccelScale = SelectSensorRampValue(AccelRangeRamp, sizeof(AccelRangeRamp)/sizeof(AccelRangeRamp[0]), + r.MaxAcceleration, (1.0f / 9.81f), "MaxAcceleration"); + GyroScale = SelectSensorRampValue(GyroRangeRamp, sizeof(GyroRangeRamp)/sizeof(GyroRangeRamp[0]), + r.MaxRotationRate, Math<float>::RadToDegreeFactor, "MaxRotationRate"); + MagScale = SelectSensorRampValue(MagRangeRamp, sizeof(MagRangeRamp)/sizeof(MagRangeRamp[0]), + r.MaxMagneticField, 1000.0f, "MaxMagneticField"); + Pack(); +} + +void SensorRangeImpl::GetSensorRange(SensorRange* r) +{ + r->MaxAcceleration = AccelScale * 9.81f; + r->MaxRotationRate = DegreeToRad((float)GyroScale); + r->MaxMagneticField= MagScale * 0.001f; +} + +SensorRange SensorRangeImpl::GetMaxSensorRange() +{ + return SensorRange(AccelRangeRamp[sizeof(AccelRangeRamp)/sizeof(AccelRangeRamp[0]) - 1] * 9.81f, + GyroRangeRamp[sizeof(GyroRangeRamp)/sizeof(GyroRangeRamp[0]) - 1] * + Math<float>::DegreeToRadFactor, + MagRangeRamp[sizeof(MagRangeRamp)/sizeof(MagRangeRamp[0]) - 1] * 0.001f); +} + +void SensorRangeImpl::Pack() +{ + Buffer[0] = 4; + Buffer[1] = UByte(CommandId & 0xFF); + Buffer[2] = UByte(CommandId >> 8); + Buffer[3] = UByte(AccelScale); + Buffer[4] = UByte(GyroScale & 0xFF); + Buffer[5] = UByte(GyroScale >> 8); + Buffer[6] = UByte(MagScale & 0xFF); + Buffer[7] = UByte(MagScale >> 8); +} + +void SensorRangeImpl::Unpack() +{ + CommandId = Buffer[1] | (UInt16(Buffer[2]) << 8); + AccelScale= Buffer[3]; + GyroScale = Buffer[4] | (UInt16(Buffer[5]) << 8); + MagScale = Buffer[6] | (UInt16(Buffer[7]) << 8); +} + +SensorConfigImpl::SensorConfigImpl() + : CommandId(0), Flags(0), PacketInterval(0), SampleRate(0) +{ + memset(Buffer, 0, PacketSize); + Buffer[0] = 2; +} + +void SensorConfigImpl::SetSensorCoordinates(bool sensorCoordinates) +{ + Flags = (Flags & ~Flag_SensorCoordinates) | (sensorCoordinates ? Flag_SensorCoordinates : 0); +} + +bool SensorConfigImpl::IsUsingSensorCoordinates() const +{ + return (Flags & Flag_SensorCoordinates) != 0; +} + +void SensorConfigImpl::Pack() +{ + Buffer[0] = 2; + Buffer[1] = UByte(CommandId & 0xFF); + Buffer[2] = UByte(CommandId >> 8); + Buffer[3] = Flags; + Buffer[4] = UByte(PacketInterval); + Buffer[5] = UByte(SampleRate & 0xFF); + Buffer[6] = UByte(SampleRate >> 8); +} + +void SensorConfigImpl::Unpack() +{ + CommandId = Buffer[1] | (UInt16(Buffer[2]) << 8); + Flags = Buffer[3]; + PacketInterval = Buffer[4]; + SampleRate = Buffer[5] | (UInt16(Buffer[6]) << 8); +} + +SensorFactoryCalibrationImpl::SensorFactoryCalibrationImpl() + : AccelOffset(), GyroOffset(), AccelMatrix(), GyroMatrix(), Temperature(0) +{ + memset(Buffer, 0, PacketSize); + Buffer[0] = 3; +} + +void SensorFactoryCalibrationImpl::Pack() +{ + SInt32 x, y, z; + + Buffer[0] = 3; + + x = SInt32(AccelOffset.x * 1e4f); + y = SInt32(AccelOffset.y * 1e4f); + z = SInt32(AccelOffset.z * 1e4f); + PackSensor(Buffer + 3, x, y, z); + + x = SInt32(GyroOffset.x * 1e4f); + y = SInt32(GyroOffset.y * 1e4f); + z = SInt32(GyroOffset.z * 1e4f); + PackSensor(Buffer + 11, x, y, z); + + // ignore the scale matrices for now +} + +void SensorFactoryCalibrationImpl::Unpack() +{ + static const float sensorMax = (1 << 20) - 1; + SInt32 x, y, z; + + UnpackSensor(Buffer + 3, &x, &y, &z); + AccelOffset.y = (float) y * 1e-4f; + AccelOffset.z = (float) z * 1e-4f; + AccelOffset.x = (float) x * 1e-4f; + + UnpackSensor(Buffer + 11, &x, &y, &z); + GyroOffset.x = (float) x * 1e-4f; + GyroOffset.y = (float) y * 1e-4f; + GyroOffset.z = (float) z * 1e-4f; + + for (int i = 0; i < 3; i++) + { + UnpackSensor(Buffer + 19 + 8 * i, &x, &y, &z); + AccelMatrix.M[i][0] = (float) x / sensorMax; + AccelMatrix.M[i][1] = (float) y / sensorMax; + AccelMatrix.M[i][2] = (float) z / sensorMax; + AccelMatrix.M[i][i] += 1.0f; + } + + for (int i = 0; i < 3; i++) + { + UnpackSensor(Buffer + 43 + 8 * i, &x, &y, &z); + GyroMatrix.M[i][0] = (float) x / sensorMax; + GyroMatrix.M[i][1] = (float) y / sensorMax; + GyroMatrix.M[i][2] = (float) z / sensorMax; + GyroMatrix.M[i][i] += 1.0f; + } + + Temperature = (float) Alg::DecodeSInt16(Buffer + 67) / 100.0f; +} + +SensorKeepAliveImpl::SensorKeepAliveImpl(UInt16 interval, UInt16 commandId) + : CommandId(commandId), KeepAliveIntervalMs(interval) +{ + Pack(); +} + +void SensorKeepAliveImpl::Pack() +{ + Buffer[0] = 8; + Buffer[1] = UByte(CommandId & 0xFF); + Buffer[2] = UByte(CommandId >> 8); + Buffer[3] = UByte(KeepAliveIntervalMs & 0xFF); + Buffer[4] = UByte(KeepAliveIntervalMs >> 8); +} + +void SensorKeepAliveImpl::Unpack() +{ + CommandId = Buffer[1] | (UInt16(Buffer[2]) << 8); + KeepAliveIntervalMs= Buffer[3] | (UInt16(Buffer[4]) << 8); +} + +} // namespace OVR |