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/**
* @file llflycam.cpp
* @brief LLFlycam class implementation
*
* $LicenseInfo:firstyear=2024&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2024, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "llflycam.h"
#include <algorithm>
#include "llcamera.h"
#include "llcoordframe.h"
LLFlycam::LLFlycam()
{
}
void LLFlycam::setTransform(const LLVector3& position, const LLQuaternion& rotation)
{
mPosition = position;
mRotation = rotation;
mRotation.normalize();
}
void LLFlycam::getTransform(LLVector3& position_out, LLQuaternion& rotation_out)
{
position_out = mPosition;
rotation_out = mRotation;
}
// 'view' is expected to be in radians
void LLFlycam::setView(F32 view)
{
mView = std::min(std::max(view, MIN_FIELD_OF_VIEW), MAX_FIELD_OF_VIEW);
}
void LLFlycam::setLinearVelocity(const LLVector3& velocity)
{
// Note: this math expects velocity components to be in range [-1.0, 1.0]
mLinearVelocity = velocity;
}
void LLFlycam::setPitchRate(F32 pitch_rate)
{
// Note: this math expects pitch_rate to be in range [-1.0, 1.0]
constexpr F32 PITCH_RATE_FACTOR = 0.75f;
mPitchRate = pitch_rate * PITCH_RATE_FACTOR;
}
void LLFlycam::setYawRate(F32 yaw_rate)
{
// Note: this math expects yaw_rate to be in range [-1.0, 1.0]
constexpr F32 YAW_RATE_FACTOR = 0.90f;
mYawRate = yaw_rate * YAW_RATE_FACTOR;
}
void LLFlycam::setZoomRate(F32 zoom_rate)
{
// Note: this math expects zoom_rate to be in range [-1.0, 1.0]
constexpr F32 FULL_ZOOM_PERIOD = 5.0f; // seconds
constexpr F32 ZOOM_RATE_FACTOR = (MAX_FIELD_OF_VIEW - MIN_FIELD_OF_VIEW) / FULL_ZOOM_PERIOD;
mZoomRate = zoom_rate * ZOOM_RATE_FACTOR;
}
void LLFlycam::integrate(F32 delta_time)
{
// cap delta_time to slow camera motion when framerates are low
constexpr F32 MAX_DELTA_TIME = 0.2f;
if (delta_time > MAX_DELTA_TIME)
{
delta_time = MAX_DELTA_TIME;
}
// Note: we modulate pitch and yaw rates by view ratio
// to make pitch and yaw work better when zoomed in close
F32 angle = delta_time * mPitchRate * (mView / DEFAULT_FIELD_OF_VIEW);
bool needs_renormalization = false;
if (fabsf(angle) > 0.0f)
{
LLQuaternion dQ;
dQ.setAngleAxis(angle, 0.0f, 1.0f, 0.0f);
mRotation = dQ * mRotation;
needs_renormalization = true;
}
angle = delta_time * mYawRate * (mView / DEFAULT_FIELD_OF_VIEW);
if (fabsf(angle) > 0.0f)
{
LLQuaternion dQ;
dQ.setAngleAxis(angle, 0.0f, 0.0f, 1.0f);
mRotation = mRotation * dQ;
needs_renormalization = true;
}
if (mLinearVelocity.lengthSquared() > 0.0f)
{
mPosition += (delta_time * mLinearVelocity) * mRotation;
}
if (mZoomRate != 0.0f)
{
// Note: we subtract the delta because "positive" zoom (e.g. "zoom in")
// produces smaller view angle
mView = std::min(std::max(mView - delta_time * mZoomRate, MIN_FIELD_OF_VIEW), MAX_FIELD_OF_VIEW);
}
if (needs_renormalization)
{
mRotation.normalize();
}
}
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