/** 
 * @file llviewerjoint.cpp
 * @brief Implementation of LLViewerJoint class
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * 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
 * $/LicenseInfo$
 */

//-----------------------------------------------------------------------------
// Header Files
//-----------------------------------------------------------------------------
#include "llviewerprecompiledheaders.h"

#include "llviewerjoint.h"

#include "llgl.h"
#include "llrender.h"
#include "llmath.h"
#include "llglheaders.h"
#include "llvoavatar.h"
#include "pipeline.h"

static const S32 MIN_PIXEL_AREA_3PASS_HAIR = 64*64;

//-----------------------------------------------------------------------------
// LLViewerJoint()
// Class Constructors
//-----------------------------------------------------------------------------
LLViewerJoint::LLViewerJoint() :
	LLAvatarJoint()
{ }

LLViewerJoint::LLViewerJoint(S32 joint_num) :
	LLAvatarJoint(joint_num)
{ }

LLViewerJoint::LLViewerJoint(const std::string &name, LLJoint *parent) :
	LLAvatarJoint(name, parent)
{ }

//-----------------------------------------------------------------------------
// ~LLViewerJoint()
// Class Destructor
//-----------------------------------------------------------------------------
LLViewerJoint::~LLViewerJoint()
{
}

//--------------------------------------------------------------------
// render()
//--------------------------------------------------------------------
U32 LLViewerJoint::render( F32 pixelArea, BOOL first_pass, BOOL is_dummy )
{
	stop_glerror();

	U32 triangle_count = 0;

	//----------------------------------------------------------------
	// ignore invisible objects
	//----------------------------------------------------------------
	if ( mValid )
	{


		//----------------------------------------------------------------
		// if object is transparent, defer it, otherwise
		// give the joint subclass a chance to draw itself
		//----------------------------------------------------------------
		if ( is_dummy )
		{
			triangle_count += drawShape( pixelArea, first_pass, is_dummy );
		}
		else if (LLPipeline::sShadowRender)
		{
			triangle_count += drawShape(pixelArea, first_pass, is_dummy );
		}
		else if ( isTransparent() && !LLPipeline::sReflectionRender)
		{
			// Hair and Skirt
			if ((pixelArea > MIN_PIXEL_AREA_3PASS_HAIR))
			{
				// render all three passes
				LLGLDisable cull(GL_CULL_FACE);
				// first pass renders without writing to the z buffer
				{
					LLGLDepthTest gls_depth(GL_TRUE, GL_FALSE);
					triangle_count += drawShape( pixelArea, first_pass, is_dummy );
				}
				// second pass writes to z buffer only
				gGL.setColorMask(false, false);
				{
					triangle_count += drawShape( pixelArea, FALSE, is_dummy  );
				}
				// third past respects z buffer and writes color
				gGL.setColorMask(true, false);
				{
					LLGLDepthTest gls_depth(GL_TRUE, GL_FALSE);
					triangle_count += drawShape( pixelArea, FALSE, is_dummy  );
				}
			}
			else
			{
				// Render Inside (no Z buffer write)
				glCullFace(GL_FRONT);
				{
					LLGLDepthTest gls_depth(GL_TRUE, GL_FALSE);
					triangle_count += drawShape( pixelArea, first_pass, is_dummy  );
				}
				// Render Outside (write to the Z buffer)
				glCullFace(GL_BACK);
				{
					triangle_count += drawShape( pixelArea, FALSE, is_dummy  );
				}
			}
		}
		else
		{
			// set up render state
			triangle_count += drawShape( pixelArea, first_pass );
		}
	}

	//----------------------------------------------------------------
	// render children
	//----------------------------------------------------------------
	for (LLJoint* j : mChildren)
	{
		// LLViewerJoint is derived from LLAvatarJoint,
		// all children of LLAvatarJoint are assumed to be LLAvatarJoint
		LLAvatarJoint* joint = static_cast<LLAvatarJoint*>(j);
		F32 jointLOD = joint->getLOD();
		if (pixelArea >= jointLOD || sDisableLOD)
		{
			triangle_count += joint->render( pixelArea, TRUE, is_dummy );

			if (jointLOD != DEFAULT_AVATAR_JOINT_LOD)
			{
				break;
			}
		}
	}

	return triangle_count;
}

//--------------------------------------------------------------------
// drawShape()
//--------------------------------------------------------------------
U32 LLViewerJoint::drawShape( F32 pixelArea, BOOL first_pass, BOOL is_dummy )
{
	return 0;
}

// End
