Second Life viewer sources 1.13.2.12

1 files changed, 188 insertions, 0 deletions

diff --git a/linden/indra/llmath/llcamera.h b/linden/indra/llmath/llcamera.h
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+/** 
+ * @file llcamera.h
+ * @brief Header file for the LLCamera class.
+ *
+ * Copyright (c) 2000-2007, Linden Research, Inc.
+ * 
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlife.com/developers/opensource/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlife.com/developers/opensource/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ */
+
+#ifndef LL_CAMERA_H
+#define LL_CAMERA_H
+
+
+#include "llmath.h"
+#include "llcoordframe.h"
+#include "llplane.h"
+
+const F32 DEFAULT_FIELD_OF_VIEW         = 60.f * DEG_TO_RAD;
+const F32 DEFAULT_ASPECT_RATIO          = 640.f / 480.f;
+const F32 DEFAULT_NEAR_PLANE            = 0.25f;
+const F32 DEFAULT_FAR_PLANE             = 64.f; // far reaches across two horizontal, not diagonal, regions
+
+const F32 MAX_FIELD_OF_VIEW = F_PI;
+const F32 MAX_ASPECT_RATIO      = 50.0f;
+const F32 MAX_NEAR_PLANE        = 10.f;
+const F32 MAX_FAR_PLANE         = 100000.0f; //1000000.0f; // Max allowed. Not good Z precision though.
+const F32 MAX_FAR_CLIP          = 1024.0f;
+
+const F32 MIN_FIELD_OF_VIEW = 0.1f;
+const F32 MIN_ASPECT_RATIO      = 0.02f;
+const F32 MIN_NEAR_PLANE        = 0.1f;
+const F32 MIN_FAR_PLANE         = 0.2f;
+
+static const LLVector3 X_AXIS(1.f,0.f,0.f);
+static const LLVector3 Y_AXIS(0.f,1.f,0.f);
+static const LLVector3 Z_AXIS(0.f,0.f,1.f);
+
+static const LLVector3 NEG_X_AXIS(-1.f,0.f,0.f);
+static const LLVector3 NEG_Y_AXIS(0.f,-1.f,0.f);
+static const LLVector3 NEG_Z_AXIS(0.f,0.f,-1.f);
+
+
+// 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...
+
+
+class LLCamera
+:       public LLCoordFrame
+{
+public:
+        enum {
+                PLANE_LEFT = 0,
+                PLANE_RIGHT = 1,
+                PLANE_BOTTOM = 2,
+                PLANE_TOP = 3,
+                PLANE_NUM = 4
+        };
+        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 {
+                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
+        };
+
+protected:
+        F32 mView;                                      // angle between top and bottom frustum planes in radians.
+        F32 mAspect;                            // width/height
+        S32 mViewHeightInPixels;        // for ViewHeightInPixels() only
+        F32 mNearPlane;
+        F32 mFarPlane;
+        LLPlane mLocalPlanes[4];
+        F32 mFixedDistance;                     // Always return this distance, unless < 0
+        LLVector3 mFrustCenter;         // center of frustum and radius squared for ultra-quick exclusion test
+        F32 mFrustRadiusSquared;
+        
+        LLPlane mWorldPlanes[PLANE_NUM];
+        LLPlane mHorizPlanes[HORIZ_PLANE_NUM];
+        LLPlane mAgentPlanes[6];                //frustum in agent space a la gluUnproject (I'm a bastard, I know) - DaveP
+        U8 mAgentPlaneMask[6];
+        LLVector3 mWorldPlanePos;               // Position of World Planes (may be offset from camera)
+public:
+        LLVector3 mAgentFrustum[8];
+        
+public:
+        LLCamera();
+        LLCamera(F32 z_field_of_view, F32 aspect_ratio, S32 view_height_in_pixels, F32 near_plane, F32 far_plane);
+
+        void setView(F32 new_view);
+        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
+        
+        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 LLPlane& getWorldPlane(S32 index) const   { return mWorldPlanes[index]; }
+        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);
+        // Returns 1 if partly in, 2 if fully in.
+        // NOTE: 'center' is in absolute frame.
+        S32 sphereInFrustumOld(const LLVector3 &center, const F32 radius) const;
+        S32 sphereInFrustum(const LLVector3 &center, const F32 radius) const;
+        S32 pointInFrustum(const LLVector3 &point) const { return sphereInFrustum(point, 0.0f); }
+        S32 sphereInFrustumFull(const LLVector3 &center, const F32 radius) const { return sphereInFrustum(center, radius); }
+        S32 AABBInFrustum(const LLVector3 &center, const LLVector3& 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 &center, F32 radius ) const;
+
+        // return the distance from pos to camera if visible (-distance if not visible)
+        F32 visibleDistance(const LLVector3 &pos, F32 rad, F32 fudgescale = 1.0f, U32 planemask = PLANE_ALL_MASK) const;
+        F32 visibleHorizDistance(const LLVector3 &pos, F32 rad, F32 fudgescale = 1.0f, U32 planemask = HORIZ_PLANE_ALL_MASK) const;
+        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);
+        void calculateWorldFrustumPlanes();
+};
+
+
+#endif
+
+
+