From 38d6d37f2d982fa959e9e8a4a3f7e1ccfad7b5d4 Mon Sep 17 00:00:00 2001
From: Jacek Antonelli
Date: Fri, 15 Aug 2008 23:44:46 -0500
Subject: Second Life viewer sources 1.13.2.12

---
 linden/indra/llmath/llcamera.h | 188 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 188 insertions(+)
 create mode 100644 linden/indra/llmath/llcamera.h

(limited to 'linden/indra/llmath/llcamera.h')

diff --git a/linden/indra/llmath/llcamera.h b/linden/indra/llmath/llcamera.h
new file mode 100644
index 0000000..82b6130
--- /dev/null
+++ b/linden/indra/llmath/llcamera.h
@@ -0,0 +1,188 @@
+/** 
+ * @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
+
+
+
-- 
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