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/**
* @file llcamera.h
* @brief Header file for the LLCamera class.
*
* $LicenseInfo:firstyear=2000&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, 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
* $/LicenseInfo$
*/
#ifndef LL_CAMERA_H
#define LL_CAMERA_H
#include "llmath.h"
#include "llcoordframe.h"
#include "llplane.h"
#include "llvector4a.h"
constexpr F32 DEFAULT_FIELD_OF_VIEW = 60.f * DEG_TO_RAD;
constexpr F32 DEFAULT_ASPECT_RATIO = 640.f / 480.f;
constexpr F32 DEFAULT_NEAR_PLANE = 0.25f;
constexpr F32 DEFAULT_FAR_PLANE = 64.f; // far reaches across two horizontal, not diagonal, regions
constexpr F32 MAX_ASPECT_RATIO = 50.0f;
constexpr F32 MAX_NEAR_PLANE = 1023.9f; // Clamp the near plane just before the skybox ends
constexpr F32 MAX_FAR_PLANE = 100000.0f; //1000000.0f; // Max allowed. Not good Z precision though.
constexpr F32 MAX_FAR_CLIP = 512.0f;
constexpr F32 MIN_ASPECT_RATIO = 0.02f;
constexpr F32 MIN_NEAR_PLANE = 0.1f;
constexpr F32 MIN_FAR_PLANE = 0.2f;
// Min/Max FOV values for square views. Call getMin/MaxView to get extremes based on current aspect ratio.
constexpr F32 MIN_FIELD_OF_VIEW = 5.0f * DEG_TO_RAD;
constexpr F32 MAX_FIELD_OF_VIEW = 175.f * DEG_TO_RAD;
// An LLCamera is an LLCoorFrame with a view frustum.
// This means that it has several methods for moving it around
// that are inherited from the LLCoordFrame() class :
//
// setOrigin(), setAxes()
// translate(), rotate()
// roll(), pitch(), yaw()
// etc...
LL_ALIGN_PREFIX(16)
class LLCamera
: public LLCoordFrame
{
public:
LLCamera(const LLCamera& rhs)
{
*this = rhs;
}
enum {
PLANE_LEFT = 0,
PLANE_RIGHT = 1,
PLANE_BOTTOM = 2,
PLANE_TOP = 3,
PLANE_NUM = 4,
PLANE_MASK_NONE = 0xff // Disable this plane
};
enum {
PLANE_LEFT_MASK = (1<<PLANE_LEFT),
PLANE_RIGHT_MASK = (1<<PLANE_RIGHT),
PLANE_BOTTOM_MASK = (1<<PLANE_BOTTOM),
PLANE_TOP_MASK = (1<<PLANE_TOP),
PLANE_ALL_MASK = 0xf,
};
enum
{ // Indexes to mAgentPlanes[] and mPlaneMask[]
AGENT_PLANE_LEFT = 0,
AGENT_PLANE_RIGHT = 1,
AGENT_PLANE_NEAR = 2,
AGENT_PLANE_BOTTOM = 3,
AGENT_PLANE_TOP = 4,
AGENT_PLANE_FAR = 5,
AGENT_PLANE_USER_CLIP = 6
};
enum
{ // Sizes for mAgentPlanes[]. 7th entry is special case for user clip
AGENT_PLANE_NO_USER_CLIP_NUM = 6,
AGENT_PLANE_USER_CLIP_NUM = 7,
PLANE_MASK_NUM = 8 // 7 actually used, 8 is for alignment
};
enum
{
AGENT_FRUSTRUM_NUM = 8
};
enum {
HORIZ_PLANE_LEFT = 0,
HORIZ_PLANE_RIGHT = 1,
HORIZ_PLANE_NUM = 2
};
enum {
HORIZ_PLANE_LEFT_MASK = (1<<HORIZ_PLANE_LEFT),
HORIZ_PLANE_RIGHT_MASK = (1<<HORIZ_PLANE_RIGHT),
HORIZ_PLANE_ALL_MASK = 0x3
};
private:
LL_ALIGN_16(LLPlane mAgentPlanes[AGENT_PLANE_USER_CLIP_NUM]); //frustum planes in agent space a la gluUnproject (I'm a bastard, I know) - DaveP
LL_ALIGN_16(LLPlane mRegionPlanes[AGENT_PLANE_USER_CLIP_NUM]); //frustum planes in a local region space, derived from mAgentPlanes
LL_ALIGN_16(LLPlane mLastAgentPlanes[AGENT_PLANE_USER_CLIP_NUM]);
U8 mPlaneMask[PLANE_MASK_NUM]; // 8 for alignment
F32 mView; // angle between top and bottom frustum planes in radians.
F32 mAspect; // width/height
S32 mViewHeightInPixels; // for ViewHeightInPixels() only
F32 mNearPlane;
F32 mFarPlane;
F32 mFixedDistance; // Always return this distance, unless < 0
LLVector3 mFrustCenter; // center of frustum and radius squared for ultra-quick exclusion test
F32 mFrustRadiusSquared;
U32 mPlaneCount; //defaults to 6, if setUserClipPlane is called, uses user supplied clip plane in
LLVector3 mWorldPlanePos; // Position of World Planes (may be offset from camera)
public:
LLVector3 mAgentFrustum[AGENT_FRUSTRUM_NUM]; //8 corners of 6-plane frustum
F32 mFrustumCornerDist; //distance to corner of frustum against far clip plane
LLPlane& getAgentPlane(U32 idx) { return mAgentPlanes[idx]; }
public:
LLCamera();
LLCamera(F32 vertical_fov_rads, F32 aspect_ratio, S32 view_height_in_pixels, F32 near_plane, F32 far_plane);
virtual ~LLCamera();
bool isChanged(); //check if mAgentPlanes changed since last frame.
LLPlane getUserClipPlane();
void setUserClipPlane(LLPlane& plane);
void disableUserClipPlane();
virtual void setView(F32 vertical_fov_rads);
void setViewHeightInPixels(S32 height);
void setAspect(F32 new_aspect);
void setNear(F32 new_near);
void setFar(F32 new_far);
F32 getView() const { return mView; } // vertical FOV in radians
S32 getViewHeightInPixels() const { return mViewHeightInPixels; }
F32 getAspect() const { return mAspect; } // width / height
F32 getNear() const { return mNearPlane; } // meters
F32 getFar() const { return mFarPlane; } // meters
// The values returned by the min/max view getters depend upon the aspect ratio
// at the time they are called and therefore should not be cached.
F32 getMinView() const;
F32 getMaxView() const;
F32 getYaw() const
{
return atan2f(mXAxis[VY], mXAxis[VX]);
}
F32 getPitch() const
{
F32 xylen = sqrtf(mXAxis[VX]*mXAxis[VX] + mXAxis[VY]*mXAxis[VY]);
return atan2f(mXAxis[VZ], xylen);
}
const LLVector3& getWorldPlanePos() const { return mWorldPlanePos; }
// Copy mView, mAspect, mNearPlane, and mFarPlane to buffer.
// Return number of bytes copied.
size_t writeFrustumToBuffer(char *buffer) const;
// Copy mView, mAspect, mNearPlane, and mFarPlane from buffer.
// Return number of bytes copied.
size_t readFrustumFromBuffer(const char *buffer);
void calcAgentFrustumPlanes(LLVector3* frust);
void calcRegionFrustumPlanes(const LLVector3& shift, F32 far_clip_distance); //calculate regional planes from mAgentPlanes.
void ignoreAgentFrustumPlane(S32 idx);
// Returns 1 if partly in, 2 if fully in.
// NOTE: 'center' is in absolute frame.
S32 sphereInFrustum(const LLVector3 ¢er, const F32 radius) const;
S32 pointInFrustum(const LLVector3 &point) const { return sphereInFrustum(point, 0.0f); }
S32 sphereInFrustumFull(const LLVector3 ¢er, const F32 radius) const { return sphereInFrustum(center, radius); }
S32 AABBInFrustum(const LLVector4a& center, const LLVector4a& radius, const LLPlane* planes = NULL);
S32 AABBInRegionFrustum(const LLVector4a& center, const LLVector4a& radius);
S32 AABBInFrustumNoFarClip(const LLVector4a& center, const LLVector4a& radius, const LLPlane* planes = NULL);
S32 AABBInRegionFrustumNoFarClip(const LLVector4a& center, const LLVector4a& radius);
//does a quick 'n dirty sphere-sphere check
S32 sphereInFrustumQuick(const LLVector3 &sphere_center, const F32 radius);
// Returns height of object in pixels (must be height because field of view
// is based on window height).
F32 heightInPixels(const LLVector3 ¢er, F32 radius ) const;
// return the distance from pos to camera if visible (-distance if not visible)
void setFixedDistance(F32 distance) { mFixedDistance = distance; }
friend std::ostream& operator<<(std::ostream &s, const LLCamera &C);
protected:
void calculateFrustumPlanes();
void calculateFrustumPlanes(F32 left, F32 right, F32 top, F32 bottom);
void calculateFrustumPlanesFromWindow(F32 x1, F32 y1, F32 x2, F32 y2);
} LL_ALIGN_POSTFIX(16);
#endif
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