/** 
 * @file llviewerjoint.h
 * @brief Implementation of LLViewerJoint class
 *
 * $LicenseInfo:firstyear=2001&license=viewergpl$
 * 
 * Copyright (c) 2001-2008, Linden Research, Inc.
 * 
 * Second Life Viewer Source Code
 * 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://secondlifegrid.net/programs/open_source/licensing/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://secondlifegrid.net/programs/open_source/licensing/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.
 * $/LicenseInfo$
 */

#ifndef LL_LLVIEWERJOINT_H
#define LL_LLVIEWERJOINT_H

//-----------------------------------------------------------------------------
// Header Files
//-----------------------------------------------------------------------------
#include "lljoint.h"
#include "llapr.h"

class LLFace;

//-----------------------------------------------------------------------------
// class LLViewerJoint
//-----------------------------------------------------------------------------
class LLViewerJoint :
	public LLJoint
{
public:
	LLViewerJoint();
	LLViewerJoint(const std::string &name, LLJoint *parent = NULL);
	virtual ~LLViewerJoint();

	// Gets the validity of this joint
	BOOL getValid() { return mValid; }

	// Sets the validity of this joint
	virtual void setValid( BOOL valid, BOOL recursive=FALSE );

	// Primarily for debugging and character setup
	// Derived classes may add text/graphic output.
	// Draw skeleton graphic for debugging and character setup
 	void renderSkeleton(BOOL recursive=TRUE); // debug only (unused)

	// Draws a bone graphic to the parent joint.
	// Derived classes may add text/graphic output.
	// Called by renderSkeleton().
 	void drawBone(); // debug only (unused)

	// Render character hierarchy.
	// Traverses the entire joint hierarchy, setting up
	// transforms and calling the drawShape().
	// Derived classes may add text/graphic output.
	virtual U32 render( F32 pixelArea, BOOL first_pass = TRUE );	// Returns triangle count

	// Returns true if this object is transparent.
	// This is used to determine in which order to draw objects.
	virtual BOOL isTransparent();

	// Returns true if this object should inherit scale modifiers from its immediate parent
	virtual BOOL inheritScale() { return FALSE; }

	// Draws the shape attached to a joint.
	// Called by render().
	virtual U32 drawShape( F32 pixelArea, BOOL first_pass = TRUE );
	virtual void drawNormals() {}

	enum Components
	{
		SC_BONE		= 1,
		SC_JOINT	= 2,
		SC_AXES		= 4
	};

	// Selects which skeleton components to draw
	void setSkeletonComponents( U32 comp, BOOL recursive = TRUE );

	// Returns which skeleton components are enables for drawing
	U32 getSkeletonComponents() { return mComponents; }

	// Sets the level of detail for this node as a minimum
	// pixel area threshold.  If the current pixel area for this
	// object is less than the specified threshold, the node is
	// not traversed.  In addition, if a value is specified (not
	// default of 0.0), and the pixel area is larger than the
	// specified minimum, the node is rendered, but no other siblings
	// of this node under the same parent will be.
	F32 getLOD() { return mMinPixelArea; }
	void setLOD( F32 pixelArea ) { mMinPixelArea = pixelArea; }
	
	// Sets the OpenGL selection stack name that is pushed and popped
	// with this joint state.  The default value indicates that no name
	// should be pushed/popped.
	enum PickName
	{
		PN_DEFAULT = -1,
		PN_0 = 0,
		PN_1 = 1,
		PN_2 = 2,
		PN_3 = 3,
		PN_4 = 4,
		PN_5 = 5
	};
	void setPickName(PickName name) { mPickName = name; }
	PickName getPickName() { return mPickName; }

	virtual void updateFaceSizes(U32 &num_vertices, U32& num_indices, F32 pixel_area);
	virtual void updateFaceData(LLFace *face, F32 pixel_area, BOOL damp_wind = FALSE);
	virtual BOOL updateLOD(F32 pixel_area, BOOL activate);
	virtual void updateJointGeometry();
	virtual void dump();

	void setVisible( BOOL visible, BOOL recursive );

public:
	static BOOL	sDisableLOD;

protected:
	BOOL		mValid;
	U32			mComponents;
	F32			mMinPixelArea;
	PickName	mPickName;
	BOOL		mVisible;
};

class LLViewerJointCollisionVolume : public LLViewerJoint
{
public:
	LLViewerJointCollisionVolume();
	LLViewerJointCollisionVolume(const std::string &name, LLJoint *parent = NULL);
	virtual ~LLViewerJointCollisionVolume() {};

	virtual BOOL inheritScale() { return TRUE; }

	void renderCollision();
	LLVector3 getVolumePos(LLVector3 &offset);
};

#endif // LL_LLVIEWERJOINT_H