/*
===========================================================================

Return to Castle Wolfenstein multiplayer GPL Source Code
Copyright (C) 1999-2010 id Software LLC, a ZeniMax Media company. 

This file is part of the Return to Castle Wolfenstein multiplayer GPL Source Code (“RTCW MP Source Code”).  

RTCW MP Source Code is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

RTCW MP Source Code 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with RTCW MP Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the RTCW MP Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the RTCW MP Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.

===========================================================================
*/


#include "tr_local.h"

/*

All bones should be an identity orientation to display the mesh exactly
as it is specified.

For all other frames, the bones represent the transformation from the
orientation of the bone in the base frame to the orientation in this
frame.

*/

//#define HIGH_PRECISION_BONES	// enable this for 32bit precision bones
//#define DBG_PROFILE_BONES

//-----------------------------------------------------------------------------
// Static Vars, ugly but easiest (and fastest) means of separating RB_SurfaceAnim
// and R_CalcBones

static float frontlerp, backlerp;
static float torsoFrontlerp, torsoBacklerp;
static int *triangles; 
static glIndex_t *pIndexes;
static int indexes;
static int baseIndex, baseVertex, oldIndexes;
static int numVerts;
static mdsVertex_t     *v;
static mdsBoneFrame_t bones[MDS_MAX_BONES], rawBones[MDS_MAX_BONES], oldBones[MDS_MAX_BONES];
static char validBones[MDS_MAX_BONES];
static char newBones[ MDS_MAX_BONES ];
static mdsBoneFrame_t  *bonePtr, *bone, *parentBone;
static mdsBoneFrameCompressed_t    *cBonePtr, *cTBonePtr, *cOldBonePtr, *cOldTBonePtr, *cBoneList, *cOldBoneList, *cBoneListTorso, *cOldBoneListTorso;
static mdsBoneInfo_t   *boneInfo, *thisBoneInfo, *parentBoneInfo;
static mdsFrame_t      *frame, *torsoFrame;
static mdsFrame_t      *oldFrame, *oldTorsoFrame;
static int frameSize;
static short           *sh, *sh2;
static float           *pf;
static vec3_t angles, tangles, torsoParentOffset, torsoAxis[3], tmpAxis[3];
static float           *tempVert, *tempNormal;
static vec3_t vec, v2, dir;
static float diff, a1, a2;
static int render_count;
static float lodRadius, lodScale;
static int             *collapse_map, *pCollapseMap;
static int collapse[ MDS_MAX_VERTS ], *pCollapse;
static int p0, p1, p2;
static qboolean isTorso, fullTorso;
static vec4_t m1[4], m2[4];
// static  vec4_t m3[4], m4[4]; // TTimo unused
// static  vec4_t tmp1[4], tmp2[4]; // TTimo unused
static vec3_t t;
static refEntity_t lastBoneEntity;

static int totalrv, totalrt, totalv, totalt;    //----(SA)

//-----------------------------------------------------------------------------

static float RB_ProjectRadius( float r, vec3_t location ) {
	float pr;
	float dist;
	float c;
	vec3_t p;
	float projected[4];

	c = DotProduct( backEnd.viewParms.or.axis[0], backEnd.viewParms.or.origin );
	dist = DotProduct( backEnd.viewParms.or.axis[0], location ) - c;

	if ( dist <= 0 ) {
		return 0;
	}

	p[0] = 0;
	p[1] = fabs( r );
	p[2] = -dist;

	projected[0] = p[0] * backEnd.viewParms.projectionMatrix[0] +
				   p[1] * backEnd.viewParms.projectionMatrix[4] +
				   p[2] * backEnd.viewParms.projectionMatrix[8] +
				   backEnd.viewParms.projectionMatrix[12];

	projected[1] = p[0] * backEnd.viewParms.projectionMatrix[1] +
				   p[1] * backEnd.viewParms.projectionMatrix[5] +
				   p[2] * backEnd.viewParms.projectionMatrix[9] +
				   backEnd.viewParms.projectionMatrix[13];

	projected[2] = p[0] * backEnd.viewParms.projectionMatrix[2] +
				   p[1] * backEnd.viewParms.projectionMatrix[6] +
				   p[2] * backEnd.viewParms.projectionMatrix[10] +
				   backEnd.viewParms.projectionMatrix[14];

	projected[3] = p[0] * backEnd.viewParms.projectionMatrix[3] +
				   p[1] * backEnd.viewParms.projectionMatrix[7] +
				   p[2] * backEnd.viewParms.projectionMatrix[11] +
				   backEnd.viewParms.projectionMatrix[15];


	pr = projected[1] / projected[3];

	if ( pr > 1.0f ) {
		pr = 1.0f;
	}

	return pr;
}

/*
=============
R_CullModel
=============
*/
static int R_CullModel( mdsHeader_t *header, trRefEntity_t *ent ) {
	vec3_t bounds[2];
	mdsFrame_t  *oldFrame, *newFrame;
	int i, frameSize;

	frameSize = (int) ( sizeof( mdsFrame_t ) - sizeof( mdsBoneFrameCompressed_t ) + header->numBones * sizeof( mdsBoneFrameCompressed_t ) );

	// compute frame pointers
	newFrame = ( mdsFrame_t * )( ( byte * ) header + header->ofsFrames + ent->e.frame * frameSize );
	oldFrame = ( mdsFrame_t * )( ( byte * ) header + header->ofsFrames + ent->e.oldframe * frameSize );

	// cull bounding sphere ONLY if this is not an upscaled entity
	if ( !ent->e.nonNormalizedAxes ) {
		if ( ent->e.frame == ent->e.oldframe ) {
			switch ( R_CullLocalPointAndRadius( newFrame->localOrigin, newFrame->radius ) )
			{
			case CULL_OUT:
				tr.pc.c_sphere_cull_md3_out++;
				return CULL_OUT;

			case CULL_IN:
				tr.pc.c_sphere_cull_md3_in++;
				return CULL_IN;

			case CULL_CLIP:
				tr.pc.c_sphere_cull_md3_clip++;
				break;
			}
		} else
		{
			int sphereCull, sphereCullB;

			sphereCull  = R_CullLocalPointAndRadius( newFrame->localOrigin, newFrame->radius );
			if ( newFrame == oldFrame ) {
				sphereCullB = sphereCull;
			} else {
				sphereCullB = R_CullLocalPointAndRadius( oldFrame->localOrigin, oldFrame->radius );
			}

			if ( sphereCull == sphereCullB ) {
				if ( sphereCull == CULL_OUT ) {
					tr.pc.c_sphere_cull_md3_out++;
					return CULL_OUT;
				} else if ( sphereCull == CULL_IN )   {
					tr.pc.c_sphere_cull_md3_in++;
					return CULL_IN;
				} else
				{
					tr.pc.c_sphere_cull_md3_clip++;
				}
			}
		}
	}

	// calculate a bounding box in the current coordinate system
	for ( i = 0 ; i < 3 ; i++ ) {
		bounds[0][i] = oldFrame->bounds[0][i] < newFrame->bounds[0][i] ? oldFrame->bounds[0][i] : newFrame->bounds[0][i];
		bounds[1][i] = oldFrame->bounds[1][i] > newFrame->bounds[1][i] ? oldFrame->bounds[1][i] : newFrame->bounds[1][i];
	}

	switch ( R_CullLocalBox( bounds ) )
	{
	case CULL_IN:
		tr.pc.c_box_cull_md3_in++;
		return CULL_IN;
	case CULL_CLIP:
		tr.pc.c_box_cull_md3_clip++;
		return CULL_CLIP;
	case CULL_OUT:
	default:
		tr.pc.c_box_cull_md3_out++;
		return CULL_OUT;
	}
}

/*
=================
RB_CalcMDSLod

=================
*/
float RB_CalcMDSLod( refEntity_t *refent, vec3_t origin, float radius, float modelBias, float modelScale ) {
	float flod, lodScale;
	float projectedRadius;

	// compute projected bounding sphere and use that as a criteria for selecting LOD

	projectedRadius = RB_ProjectRadius( radius, origin );
	if ( projectedRadius != 0 ) {

//		ri.Printf (PRINT_ALL, "projected radius: %f\n", projectedRadius);

		lodScale = r_lodscale->value;   // fudge factor since MDS uses a much smoother method of LOD
		flod = projectedRadius * lodScale * modelScale;
	} else
	{
		// object intersects near view plane, e.g. view weapon
		flod = 1.0f;
	}

	if ( refent->reFlags & REFLAG_FORCE_LOD ) {
		flod *= 0.5;
	}
//----(SA)	like reflag_force_lod, but separate for the moment
	if ( refent->reFlags & REFLAG_DEAD_LOD ) {
		flod *= 0.8;
	}

	flod -= 0.25 * ( r_lodbias->value ) + modelBias;

	if ( flod < 0.0 ) {
		flod = 0.0;
	} else if ( flod > 1.0f ) {
		flod = 1.0f;
	}

	return flod;
}

/*
=================
R_ComputeFogNum

=================
*/
static int R_ComputeFogNum( mdsHeader_t *header, trRefEntity_t *ent ) {
	int i, j;
	fog_t           *fog;
	mdsFrame_t      *mdsFrame;
	vec3_t localOrigin;

	if ( tr.refdef.rdflags & RDF_NOWORLDMODEL ) {
		return 0;
	}

	// FIXME: non-normalized axis issues
	mdsFrame = ( mdsFrame_t * )( ( byte * ) header + header->ofsFrames + ( sizeof( mdsFrame_t ) + sizeof( mdsBoneFrameCompressed_t ) * ( header->numBones - 1 ) ) * ent->e.frame );
	VectorAdd( ent->e.origin, mdsFrame->localOrigin, localOrigin );
	for ( i = 1 ; i < tr.world->numfogs ; i++ ) {
		fog = &tr.world->fogs[i];
		for ( j = 0 ; j < 3 ; j++ ) {
			if ( localOrigin[j] - mdsFrame->radius >= fog->bounds[1][j] ) {
				break;
			}
			if ( localOrigin[j] + mdsFrame->radius <= fog->bounds[0][j] ) {
				break;
			}
		}
		if ( j == 3 ) {
			return i;
		}
	}

	return 0;
}

/*
==============
R_AddAnimSurfaces
==============
*/
void R_AddAnimSurfaces( trRefEntity_t *ent ) {
	mdsHeader_t     *header;
	mdsSurface_t    *surface;
	shader_t        *shader = 0;
	int i, fogNum, cull;
	qboolean personalModel;

	// don't add third_person objects if not in a portal
	personalModel = ( ent->e.renderfx & RF_THIRD_PERSON ) && !tr.viewParms.isPortal;

	header = tr.currentModel->mds;

	//
	// cull the entire model if merged bounding box of both frames
	// is outside the view frustum.
	//
	cull = R_CullModel( header, ent );
	if ( cull == CULL_OUT ) {
		return;
	}

	//
	// set up lighting now that we know we aren't culled
	//
	if ( !personalModel || r_shadows->integer > 1 ) {
		R_SetupEntityLighting( &tr.refdef, ent );
	}

	//
	// see if we are in a fog volume
	//
	fogNum = R_ComputeFogNum( header, ent );

	surface = ( mdsSurface_t * )( (byte *)header + header->ofsSurfaces );
	for ( i = 0 ; i < header->numSurfaces ; i++ ) {

		if ( ent->e.customShader ) {
			shader = R_GetShaderByHandle( ent->e.customShader );
		} else if ( ent->e.customSkin > 0 && ent->e.customSkin < tr.numSkins ) {
			skin_t *skin;
			int j;

			skin = R_GetSkinByHandle( ent->e.customSkin );

			// match the surface name to something in the skin file
			shader = tr.defaultShader;

			if ( ent->e.renderfx & RF_BLINK ) {
				const char *s = va( "%s_b", surface->name );   // append '_b' for 'blink'
				for ( j = 0 ; j < skin->numSurfaces ; j++ ) {
					if ( !strcmp( skin->surfaces[j].name, s ) ) {
						shader = skin->surfaces[j].shader;
						break;
					}
				}
			}

			if ( shader == tr.defaultShader ) {    // blink reference in skin was not found
				for ( j = 0 ; j < skin->numSurfaces ; j++ ) {
					// the names have both been lowercased
					if ( !strcmp( skin->surfaces[j].name, surface->name ) ) {
						shader = skin->surfaces[j].shader;
						break;
					}
				}
			}

			if ( shader == tr.defaultShader ) {
				ri.Printf( PRINT_DEVELOPER, "WARNING: no shader for surface %s in skin %s\n", surface->name, skin->name );
			} else if ( shader->defaultShader )     {
				ri.Printf( PRINT_DEVELOPER, "WARNING: shader %s in skin %s not found\n", shader->name, skin->name );
			}
		} else {
			shader = R_GetShaderByHandle( surface->shaderIndex );
		}

		// don't add third_person objects if not viewing through a portal
		if ( !personalModel ) {
			R_AddDrawSurf( (void *)surface, shader, fogNum, qfalse );
		}

		surface = ( mdsSurface_t * )( (byte *)surface + surface->ofsEnd );
	}
}

static ID_INLINE void LocalMatrixTransformVector( vec3_t in, vec3_t mat[ 3 ], vec3_t out ) {
	out[ 0 ] = in[ 0 ] * mat[ 0 ][ 0 ] + in[ 1 ] * mat[ 0 ][ 1 ] + in[ 2 ] * mat[ 0 ][ 2 ];
	out[ 1 ] = in[ 0 ] * mat[ 1 ][ 0 ] + in[ 1 ] * mat[ 1 ][ 1 ] + in[ 2 ] * mat[ 1 ][ 2 ];
	out[ 2 ] = in[ 0 ] * mat[ 2 ][ 0 ] + in[ 1 ] * mat[ 2 ][ 1 ] + in[ 2 ] * mat[ 2 ][ 2 ];
}

static ID_INLINE void LocalScaledMatrixTransformVector( vec3_t in, float s, vec3_t mat[ 3 ], vec3_t out ) {
	out[ 0 ] = ( 1.0f - s ) * in[ 0 ] + s * ( in[ 0 ] * mat[ 0 ][ 0 ] + in[ 1 ] * mat[ 0 ][ 1 ] + in[ 2 ] * mat[ 0 ][ 2 ] );
	out[ 1 ] = ( 1.0f - s ) * in[ 1 ] + s * ( in[ 0 ] * mat[ 1 ][ 0 ] + in[ 1 ] * mat[ 1 ][ 1 ] + in[ 2 ] * mat[ 1 ][ 2 ] );
	out[ 2 ] = ( 1.0f - s ) * in[ 2 ] + s * ( in[ 0 ] * mat[ 2 ][ 0 ] + in[ 1 ] * mat[ 2 ][ 1 ] + in[ 2 ] * mat[ 2 ][ 2 ] );
}

static ID_INLINE void LocalAddScaledMatrixTransformVectorTranslate( vec3_t in, float s, vec3_t mat[ 3 ], vec3_t tr, vec3_t out ) {
	out[ 0 ] += s * ( in[ 0 ] * mat[ 0 ][ 0 ] + in[ 1 ] * mat[ 0 ][ 1 ] + in[ 2 ] * mat[ 0 ][ 2 ] + tr[ 0 ] );
	out[ 1 ] += s * ( in[ 0 ] * mat[ 1 ][ 0 ] + in[ 1 ] * mat[ 1 ][ 1 ] + in[ 2 ] * mat[ 1 ][ 2 ] + tr[ 1 ] );
	out[ 2 ] += s * ( in[ 0 ] * mat[ 2 ][ 0 ] + in[ 1 ] * mat[ 2 ][ 1 ] + in[ 2 ] * mat[ 2 ][ 2 ] + tr[ 2 ] );
}

static float LAVangle;
static float sp, sy, cp, cy;
//static float    sr, cr;// TTimo: unused

static ID_INLINE void LocalAngleVector( vec3_t angles, vec3_t forward ) {
	LAVangle = angles[YAW] * ( M_PI * 2 / 360 );
	sy = sin( LAVangle );
	cy = cos( LAVangle );
	LAVangle = angles[PITCH] * ( M_PI * 2 / 360 );
	sp = sin( LAVangle );
	cp = cos( LAVangle );

	forward[0] = cp * cy;
	forward[1] = cp * sy;
	forward[2] = -sp;
}

static ID_INLINE void LocalVectorMA( vec3_t org, float dist, vec3_t vec, vec3_t out ) {
	out[0] = org[0] + dist * vec[0];
	out[1] = org[1] + dist * vec[1];
	out[2] = org[2] + dist * vec[2];
}

#define ANGLES_SHORT_TO_FLOAT( pf, sh )     { *( pf++ ) = SHORT2ANGLE( *( sh++ ) ); *( pf++ ) = SHORT2ANGLE( *( sh++ ) ); *( pf++ ) = SHORT2ANGLE( *( sh++ ) ); }

static ID_INLINE void SLerp_Normal( vec3_t from, vec3_t to, float tt, vec3_t out ) {
	float ft = 1.0 - tt;

	out[0] = from[0] * ft + to[0] * tt;
	out[1] = from[1] * ft + to[1] * tt;
	out[2] = from[2] * ft + to[2] * tt;

	VectorNormalize( out );
}

/*
===============================================================================

4x4 Matrices

===============================================================================
*/

// TTimo: const usage would require an explicit cast, non ANSI C
// see unix/const-arg.c
static ID_INLINE void Matrix4MultiplyInto3x3AndTranslation( /*const*/ vec4_t a[4], /*const*/ vec4_t b[4], vec3_t dst[3], vec3_t t ) {
	dst[0][0] = a[0][0] * b[0][0] + a[0][1] * b[1][0] + a[0][2] * b[2][0] + a[0][3] * b[3][0];
	dst[0][1] = a[0][0] * b[0][1] + a[0][1] * b[1][1] + a[0][2] * b[2][1] + a[0][3] * b[3][1];
	dst[0][2] = a[0][0] * b[0][2] + a[0][1] * b[1][2] + a[0][2] * b[2][2] + a[0][3] * b[3][2];
	t[0]      = a[0][0] * b[0][3] + a[0][1] * b[1][3] + a[0][2] * b[2][3] + a[0][3] * b[3][3];

	dst[1][0] = a[1][0] * b[0][0] + a[1][1] * b[1][0] + a[1][2] * b[2][0] + a[1][3] * b[3][0];
	dst[1][1] = a[1][0] * b[0][1] + a[1][1] * b[1][1] + a[1][2] * b[2][1] + a[1][3] * b[3][1];
	dst[1][2] = a[1][0] * b[0][2] + a[1][1] * b[1][2] + a[1][2] * b[2][2] + a[1][3] * b[3][2];
	t[1]      = a[1][0] * b[0][3] + a[1][1] * b[1][3] + a[1][2] * b[2][3] + a[1][3] * b[3][3];

	dst[2][0] = a[2][0] * b[0][0] + a[2][1] * b[1][0] + a[2][2] * b[2][0] + a[2][3] * b[3][0];
	dst[2][1] = a[2][0] * b[0][1] + a[2][1] * b[1][1] + a[2][2] * b[2][1] + a[2][3] * b[3][1];
	dst[2][2] = a[2][0] * b[0][2] + a[2][1] * b[1][2] + a[2][2] * b[2][2] + a[2][3] * b[3][2];
	t[2]      = a[2][0] * b[0][3] + a[2][1] * b[1][3] + a[2][2] * b[2][3] + a[2][3] * b[3][3];
}

// can put an axis rotation followed by a translation directly into one matrix
// TTimo: const usage would require an explicit cast, non ANSI C
// see unix/const-arg.c
static ID_INLINE void Matrix4FromAxisPlusTranslation( /*const*/ vec3_t axis[3], const vec3_t t, vec4_t dst[4] ) {
	int i, j;
	for ( i = 0; i < 3; i++ ) {
		for ( j = 0; j < 3; j++ ) {
			dst[i][j] = axis[i][j];
		}
		dst[3][i] = 0;
		dst[i][3] = t[i];
	}
	dst[3][3] = 1;
}

// can put a scaled axis rotation followed by a translation directly into one matrix
// TTimo: const usage would require an explicit cast, non ANSI C
// see unix/const-arg.c
static ID_INLINE void Matrix4FromScaledAxisPlusTranslation( /*const*/ vec3_t axis[3], const float scale, const vec3_t t, vec4_t dst[4] ) {
	int i, j;

	for ( i = 0; i < 3; i++ ) {
		for ( j = 0; j < 3; j++ ) {
			dst[i][j] = scale * axis[i][j];
			if ( i == j ) {
				dst[i][j] += 1.0f - scale;
			}
		}
		dst[3][i] = 0;
		dst[i][3] = t[i];
	}
	dst[3][3] = 1;
}

/*
===============================================================================

3x3 Matrices

===============================================================================
*/

static ID_INLINE void Matrix3Transpose( const vec3_t matrix[3], vec3_t transpose[3] ) {
	int i, j;
	for ( i = 0; i < 3; i++ ) {
		for ( j = 0; j < 3; j++ ) {
			transpose[i][j] = matrix[j][i];
		}
	}
}


/*
==============
R_CalcBone
==============
*/
void R_CalcBone( mdsHeader_t *header, const refEntity_t *refent, int boneNum ) {
	int j;

	thisBoneInfo = &boneInfo[boneNum];
	if ( thisBoneInfo->torsoWeight ) {
		cTBonePtr = &cBoneListTorso[boneNum];
		isTorso = qtrue;
		if ( thisBoneInfo->torsoWeight == 1.0f ) {
			fullTorso = qtrue;
		}
	} else {
		isTorso = qfalse;
		fullTorso = qfalse;
	}
	cBonePtr = &cBoneList[boneNum];

	bonePtr = &bones[ boneNum ];

	// we can assume the parent has already been uncompressed for this frame + lerp
	if ( thisBoneInfo->parent >= 0 ) {
		parentBone = &bones[ thisBoneInfo->parent ];
		parentBoneInfo = &boneInfo[ thisBoneInfo->parent ];
	} else {
		parentBone = NULL;
		parentBoneInfo = NULL;
	}

#ifdef HIGH_PRECISION_BONES
	// rotation
	if ( fullTorso ) {
		VectorCopy( cTBonePtr->angles, angles );
	} else {
		VectorCopy( cBonePtr->angles, angles );
		if ( isTorso ) {
			VectorCopy( cTBonePtr->angles, tangles );
			// blend the angles together
			for ( j = 0; j < 3; j++ ) {
				diff = tangles[j] - angles[j];
				if ( fabs( diff ) > 180 ) {
					diff = AngleNormalize180( diff );
				}
				angles[j] = angles[j] + thisBoneInfo->torsoWeight * diff;
			}
		}
	}
#else
	// rotation
	if ( fullTorso ) {
		sh = (short *)cTBonePtr->angles;
		pf = angles;
		ANGLES_SHORT_TO_FLOAT( pf, sh );
	} else {
		sh = (short *)cBonePtr->angles;
		pf = angles;
		ANGLES_SHORT_TO_FLOAT( pf, sh );
		if ( isTorso ) {
			sh = (short *)cTBonePtr->angles;
			pf = tangles;
			ANGLES_SHORT_TO_FLOAT( pf, sh );
			// blend the angles together
			for ( j = 0; j < 3; j++ ) {
				diff = tangles[j] - angles[j];
				if ( fabs( diff ) > 180 ) {
					diff = AngleNormalize180( diff );
				}
				angles[j] = angles[j] + thisBoneInfo->torsoWeight * diff;
			}
		}
	}
#endif
	AnglesToAxis( angles, bonePtr->matrix );

	// translation
	if ( parentBone ) {

#ifdef HIGH_PRECISION_BONES
		if ( fullTorso ) {
			angles[0] = cTBonePtr->ofsAngles[0];
			angles[1] = cTBonePtr->ofsAngles[1];
			angles[2] = 0;
			LocalAngleVector( angles, vec );
			LocalVectorMA( parentBone->translation, thisBoneInfo->parentDist, vec, bonePtr->translation );
		} else {

			angles[0] = cBonePtr->ofsAngles[0];
			angles[1] = cBonePtr->ofsAngles[1];
			angles[2] = 0;
			LocalAngleVector( angles, vec );

			if ( isTorso ) {
				tangles[0] = cTBonePtr->ofsAngles[0];
				tangles[1] = cTBonePtr->ofsAngles[1];
				tangles[2] = 0;
				LocalAngleVector( tangles, v2 );

				// blend the angles together
				SLerp_Normal( vec, v2, thisBoneInfo->torsoWeight, vec );
				LocalVectorMA( parentBone->translation, thisBoneInfo->parentDist, vec, bonePtr->translation );

			} else {    // legs bone
				LocalVectorMA( parentBone->translation, thisBoneInfo->parentDist, vec, bonePtr->translation );
			}
		}
#else
		if ( fullTorso ) {
			sh = (short *)cTBonePtr->ofsAngles; pf = angles;
			*( pf++ ) = SHORT2ANGLE( *( sh++ ) ); *( pf++ ) = SHORT2ANGLE( *( sh++ ) ); *( pf++ ) = 0;
			LocalAngleVector( angles, vec );
			LocalVectorMA( parentBone->translation, thisBoneInfo->parentDist, vec, bonePtr->translation );
		} else {

			sh = (short *)cBonePtr->ofsAngles; pf = angles;
			*( pf++ ) = SHORT2ANGLE( *( sh++ ) ); *( pf++ ) = SHORT2ANGLE( *( sh++ ) ); *( pf++ ) = 0;
			LocalAngleVector( angles, vec );

			if ( isTorso ) {
				sh = (short *)cTBonePtr->ofsAngles;
				pf = tangles;
				*( pf++ ) = SHORT2ANGLE( *( sh++ ) ); *( pf++ ) = SHORT2ANGLE( *( sh++ ) ); *( pf++ ) = 0;
				LocalAngleVector( tangles, v2 );

				// blend the angles together
				SLerp_Normal( vec, v2, thisBoneInfo->torsoWeight, vec );
				LocalVectorMA( parentBone->translation, thisBoneInfo->parentDist, vec, bonePtr->translation );

			} else {    // legs bone
				LocalVectorMA( parentBone->translation, thisBoneInfo->parentDist, vec, bonePtr->translation );
			}
		}
#endif
	} else {    // just use the frame position
		bonePtr->translation[0] = frame->parentOffset[0];
		bonePtr->translation[1] = frame->parentOffset[1];
		bonePtr->translation[2] = frame->parentOffset[2];
	}
	//
	if ( boneNum == header->torsoParent ) { // this is the torsoParent
		VectorCopy( bonePtr->translation, torsoParentOffset );
	}
	//
	validBones[boneNum] = 1;
	//
	rawBones[boneNum] = *bonePtr;
	newBones[boneNum] = 1;

}

/*
==============
R_CalcBoneLerp
==============
*/
void R_CalcBoneLerp( mdsHeader_t *header, const refEntity_t *refent, int boneNum ) {
	int j;

	if ( !refent || !header || boneNum < 0 || boneNum >= MDS_MAX_BONES ) {
		return;
	}


	thisBoneInfo = &boneInfo[boneNum];

	if ( !thisBoneInfo ) {
		return;
	}

	if ( thisBoneInfo->parent >= 0 ) {
		parentBone = &bones[ thisBoneInfo->parent ];
		parentBoneInfo = &boneInfo[ thisBoneInfo->parent ];
	} else {
		parentBone = NULL;
		parentBoneInfo = NULL;
	}

	if ( thisBoneInfo->torsoWeight ) {
		cTBonePtr = &cBoneListTorso[boneNum];
		cOldTBonePtr = &cOldBoneListTorso[boneNum];
		isTorso = qtrue;
		if ( thisBoneInfo->torsoWeight == 1.0f ) {
			fullTorso = qtrue;
		}
	} else {
		isTorso = qfalse;
		fullTorso = qfalse;
	}
	cBonePtr = &cBoneList[boneNum];
	cOldBonePtr = &cOldBoneList[boneNum];

	bonePtr = &bones[boneNum];

	newBones[ boneNum ] = 1;

	// rotation (take into account 170 to -170 lerps, which need to take the shortest route)
	if ( fullTorso ) {

		sh = (short *)cTBonePtr->angles;
		sh2 = (short *)cOldTBonePtr->angles;
		pf = angles;

		a1 = SHORT2ANGLE( *( sh++ ) ); a2 = SHORT2ANGLE( *( sh2++ ) ); diff = AngleNormalize180( a1 - a2 );
		*( pf++ ) = a1 - torsoBacklerp * diff;
		a1 = SHORT2ANGLE( *( sh++ ) ); a2 = SHORT2ANGLE( *( sh2++ ) ); diff = AngleNormalize180( a1 - a2 );
		*( pf++ ) = a1 - torsoBacklerp * diff;
		a1 = SHORT2ANGLE( *( sh++ ) ); a2 = SHORT2ANGLE( *( sh2++ ) ); diff = AngleNormalize180( a1 - a2 );
		*( pf++ ) = a1 - torsoBacklerp * diff;

	} else {

		sh = (short *)cBonePtr->angles;
		sh2 = (short *)cOldBonePtr->angles;
		pf = angles;

		a1 = SHORT2ANGLE( *( sh++ ) ); a2 = SHORT2ANGLE( *( sh2++ ) ); diff = AngleNormalize180( a1 - a2 );
		*( pf++ ) = a1 - backlerp * diff;
		a1 = SHORT2ANGLE( *( sh++ ) ); a2 = SHORT2ANGLE( *( sh2++ ) ); diff = AngleNormalize180( a1 - a2 );
		*( pf++ ) = a1 - backlerp * diff;
		a1 = SHORT2ANGLE( *( sh++ ) ); a2 = SHORT2ANGLE( *( sh2++ ) ); diff = AngleNormalize180( a1 - a2 );
		*( pf++ ) = a1 - backlerp * diff;

		if ( isTorso ) {

			sh = (short *)cTBonePtr->angles;
			sh2 = (short *)cOldTBonePtr->angles;
			pf = tangles;

			a1 = SHORT2ANGLE( *( sh++ ) ); a2 = SHORT2ANGLE( *( sh2++ ) ); diff = AngleNormalize180( a1 - a2 );
			*( pf++ ) = a1 - torsoBacklerp * diff;
			a1 = SHORT2ANGLE( *( sh++ ) ); a2 = SHORT2ANGLE( *( sh2++ ) ); diff = AngleNormalize180( a1 - a2 );
			*( pf++ ) = a1 - torsoBacklerp * diff;
			a1 = SHORT2ANGLE( *( sh++ ) ); a2 = SHORT2ANGLE( *( sh2++ ) ); diff = AngleNormalize180( a1 - a2 );
			*( pf++ ) = a1 - torsoBacklerp * diff;

			// blend the angles together
			for ( j = 0; j < 3; j++ ) {
				diff = tangles[j] - angles[j];
				if ( fabs( diff ) > 180 ) {
					diff = AngleNormalize180( diff );
				}
				angles[j] = angles[j] + thisBoneInfo->torsoWeight * diff;
			}

		}

	}
	AnglesToAxis( angles, bonePtr->matrix );

	if ( parentBone ) {

		if ( fullTorso ) {
			sh = (short *)cTBonePtr->ofsAngles;
			sh2 = (short *)cOldTBonePtr->ofsAngles;
		} else {
			sh = (short *)cBonePtr->ofsAngles;
			sh2 = (short *)cOldBonePtr->ofsAngles;
		}

		pf = angles;
		*( pf++ ) = SHORT2ANGLE( *( sh++ ) );
		*( pf++ ) = SHORT2ANGLE( *( sh++ ) );
		*( pf++ ) = 0;
		LocalAngleVector( angles, v2 );     // new

		pf = angles;
		*( pf++ ) = SHORT2ANGLE( *( sh2++ ) );
		*( pf++ ) = SHORT2ANGLE( *( sh2++ ) );
		*( pf++ ) = 0;
		LocalAngleVector( angles, vec );    // old

		// blend the angles together
		if ( fullTorso ) {
			SLerp_Normal( vec, v2, torsoFrontlerp, dir );
		} else {
			SLerp_Normal( vec, v2, frontlerp, dir );
		}

		// translation
		if ( !fullTorso && isTorso ) {    // partial legs/torso, need to lerp according to torsoWeight

			// calc the torso frame
			sh = (short *)cTBonePtr->ofsAngles;
			sh2 = (short *)cOldTBonePtr->ofsAngles;

			pf = angles;
			*( pf++ ) = SHORT2ANGLE( *( sh++ ) );
			*( pf++ ) = SHORT2ANGLE( *( sh++ ) );
			*( pf++ ) = 0;
			LocalAngleVector( angles, v2 );     // new

			pf = angles;
			*( pf++ ) = SHORT2ANGLE( *( sh2++ ) );
			*( pf++ ) = SHORT2ANGLE( *( sh2++ ) );
			*( pf++ ) = 0;
			LocalAngleVector( angles, vec );    // old

			// blend the angles together
			SLerp_Normal( vec, v2, torsoFrontlerp, v2 );

			// blend the torso/legs together
			SLerp_Normal( dir, v2, thisBoneInfo->torsoWeight, dir );

		}

		LocalVectorMA( parentBone->translation, thisBoneInfo->parentDist, dir, bonePtr->translation );

	} else {    // just interpolate the frame positions

		bonePtr->translation[0] = frontlerp * frame->parentOffset[0] + backlerp * oldFrame->parentOffset[0];
		bonePtr->translation[1] = frontlerp * frame->parentOffset[1] + backlerp * oldFrame->parentOffset[1];
		bonePtr->translation[2] = frontlerp * frame->parentOffset[2] + backlerp * oldFrame->parentOffset[2];

	}
	//
	if ( boneNum == header->torsoParent ) { // this is the torsoParent
		VectorCopy( bonePtr->translation, torsoParentOffset );
	}
	validBones[boneNum] = 1;
	//
	rawBones[boneNum] = *bonePtr;
	newBones[boneNum] = 1;

}


/*
==============
R_CalcBones

	The list of bones[] should only be built and modified from within here
==============
*/
void R_CalcBones( mdsHeader_t *header, const refEntity_t *refent, int *boneList, int numBones ) {

	int i;
	int     *boneRefs;
	float torsoWeight;

	//
	// if the entity has changed since the last time the bones were built, reset them
	//
	if ( memcmp( &lastBoneEntity, refent, sizeof( refEntity_t ) ) ) {
		// different, cached bones are not valid
		memset( validBones, 0, header->numBones );
		lastBoneEntity = *refent;

		// (SA) also reset these counter statics
//----(SA)	print stats for the complete model (not per-surface)
		if ( r_bonesDebug->integer == 4 && totalrt ) {
			ri.Printf( PRINT_ALL, "Lod %.2f  verts %4d/%4d  tris %4d/%4d  (%.2f%%)\n",
					   lodScale,
					   totalrv,
					   totalv,
					   totalrt,
					   totalt,
					   ( float )( 100.0 * totalrt ) / (float) totalt );
		}
//----(SA)	end
		totalrv = totalrt = totalv = totalt = 0;

	}

	memset( newBones, 0, header->numBones );

	if ( refent->oldframe == refent->frame ) {
		backlerp = 0;
		frontlerp = 1;
	} else  {
		backlerp = refent->backlerp;
		frontlerp = 1.0f - backlerp;
	}

	if ( refent->oldTorsoFrame == refent->torsoFrame ) {
		torsoBacklerp = 0;
		torsoFrontlerp = 1;
	} else {
		torsoBacklerp = refent->torsoBacklerp;
		torsoFrontlerp = 1.0f - torsoBacklerp;
	}

	frameSize = (int) ( sizeof( mdsFrame_t ) + ( header->numBones - 1 ) * sizeof( mdsBoneFrameCompressed_t ) );

	frame = ( mdsFrame_t * )( (byte *)header + header->ofsFrames +
							  refent->frame * frameSize );
	torsoFrame = ( mdsFrame_t * )( (byte *)header + header->ofsFrames +
								   refent->torsoFrame * frameSize );
	oldFrame = ( mdsFrame_t * )( (byte *)header + header->ofsFrames +
								 refent->oldframe * frameSize );
	oldTorsoFrame = ( mdsFrame_t * )( (byte *)header + header->ofsFrames +
									  refent->oldTorsoFrame * frameSize );

	//
	// lerp all the needed bones (torsoParent is always the first bone in the list)
	//
	cBoneList = frame->bones;
	cBoneListTorso = torsoFrame->bones;

	boneInfo = ( mdsBoneInfo_t * )( (byte *)header + header->ofsBones );
	boneRefs = boneList;
	//
	Matrix3Transpose( refent->torsoAxis, torsoAxis );

#ifdef HIGH_PRECISION_BONES
	if ( qtrue ) {
#else
	if ( !backlerp && !torsoBacklerp ) {
#endif

		for ( i = 0; i < numBones; i++, boneRefs++ ) {

			if ( validBones[*boneRefs] ) {
				// this bone is still in the cache
				bones[*boneRefs] = rawBones[*boneRefs];
				continue;
			}

			// find our parent, and make sure it has been calculated
			if ( ( boneInfo[*boneRefs].parent >= 0 ) && ( !validBones[boneInfo[*boneRefs].parent] && !newBones[boneInfo[*boneRefs].parent] ) ) {
				R_CalcBone( header, refent, boneInfo[*boneRefs].parent );
			}

			R_CalcBone( header, refent, *boneRefs );

		}

	} else {    // interpolated

		cOldBoneList = oldFrame->bones;
		cOldBoneListTorso = oldTorsoFrame->bones;

		for ( i = 0; i < numBones; i++, boneRefs++ ) {

			if ( validBones[*boneRefs] ) {
				// this bone is still in the cache
				bones[*boneRefs] = rawBones[*boneRefs];
				continue;
			}

			// find our parent, and make sure it has been calculated
			if ( ( boneInfo[*boneRefs].parent >= 0 ) && ( !validBones[boneInfo[*boneRefs].parent] && !newBones[boneInfo[*boneRefs].parent] ) ) {
				R_CalcBoneLerp( header, refent, boneInfo[*boneRefs].parent );
			}

			R_CalcBoneLerp( header, refent, *boneRefs );

		}

	}

	// adjust for torso rotations
	torsoWeight = 0;
	boneRefs = boneList;
	for ( i = 0; i < numBones; i++, boneRefs++ ) {

		thisBoneInfo = &boneInfo[ *boneRefs ];
		bonePtr = &bones[ *boneRefs ];
		// add torso rotation
		if ( thisBoneInfo->torsoWeight > 0 ) {

			if ( !newBones[ *boneRefs ] ) {
				// just copy it back from the previous calc
				bones[ *boneRefs ] = oldBones[ *boneRefs ];
				continue;
			}

			if ( !( thisBoneInfo->flags & BONEFLAG_TAG ) ) {

				// 1st multiply with the bone->matrix
				// 2nd translation for rotation relative to bone around torso parent offset
				VectorSubtract( bonePtr->translation, torsoParentOffset, t );
				Matrix4FromAxisPlusTranslation( bonePtr->matrix, t, m1 );
				// 3rd scaled rotation
				// 4th translate back to torso parent offset
				// use previously created matrix if available for the same weight
				if ( torsoWeight != thisBoneInfo->torsoWeight ) {
					Matrix4FromScaledAxisPlusTranslation( torsoAxis, thisBoneInfo->torsoWeight, torsoParentOffset, m2 );
					torsoWeight = thisBoneInfo->torsoWeight;
				}
				// multiply matrices to create one matrix to do all calculations
				Matrix4MultiplyInto3x3AndTranslation( m2, m1, bonePtr->matrix, bonePtr->translation );

			} else {    // tag's require special handling

				// rotate each of the axis by the torsoAngles
				LocalScaledMatrixTransformVector( bonePtr->matrix[0], thisBoneInfo->torsoWeight, torsoAxis, tmpAxis[0] );
				LocalScaledMatrixTransformVector( bonePtr->matrix[1], thisBoneInfo->torsoWeight, torsoAxis, tmpAxis[1] );
				LocalScaledMatrixTransformVector( bonePtr->matrix[2], thisBoneInfo->torsoWeight, torsoAxis, tmpAxis[2] );
				memcpy( bonePtr->matrix, tmpAxis, sizeof( tmpAxis ) );

				// rotate the translation around the torsoParent
				VectorSubtract( bonePtr->translation, torsoParentOffset, t );
				LocalScaledMatrixTransformVector( t, thisBoneInfo->torsoWeight, torsoAxis, bonePtr->translation );
				VectorAdd( bonePtr->translation, torsoParentOffset, bonePtr->translation );

			}
		}
	}

	// backup the final bones
	memcpy( oldBones, bones, sizeof( bones[0] ) * header->numBones );
}

#ifdef DBG_PROFILE_BONES
#define DBG_SHOWTIME    Com_Printf( "%i: %i, ", di++, ( dt = ri.Milliseconds() ) - ldt ); ldt = dt;
#else
#define DBG_SHOWTIME    ;
#endif

/*
==============
RB_SurfaceAnim
==============
*/
void RB_SurfaceAnim( mdsSurface_t *surface ) {
	int j, k;
	refEntity_t *refent;
	int             *boneList;
	mdsHeader_t     *header;

#ifdef DBG_PROFILE_BONES
	int di = 0, dt, ldt;

	dt = ri.Milliseconds();
	ldt = dt;
#endif

	refent = &backEnd.currentEntity->e;
	boneList = ( int * )( (byte *)surface + surface->ofsBoneReferences );
	header = ( mdsHeader_t * )( (byte *)surface + surface->ofsHeader );

	R_CalcBones( header, (const refEntity_t *)refent, boneList, surface->numBoneReferences );

	DBG_SHOWTIME

	//
	// calculate LOD
	//
	// TODO: lerp the radius and origin
	VectorAdd( refent->origin, frame->localOrigin, vec );
	lodRadius = frame->radius;
	lodScale = RB_CalcMDSLod( refent, vec, lodRadius, header->lodBias, header->lodScale );


//DBG_SHOWTIME

//----(SA)	modification to allow dead skeletal bodies to go below minlod (experiment)
	if ( refent->reFlags & REFLAG_DEAD_LOD ) {
		if ( lodScale < 0.35 ) {   // allow dead to lod down to 35% (even if below surf->minLod) (%35 is arbitrary and probably not good generally.  worked for the blackguard/infantry as a test though)
			lodScale = 0.35;
		}
		render_count = (int)( (float) surface->numVerts * lodScale );

	} else {
		render_count = (int)( (float) surface->numVerts * lodScale );
		if ( render_count < surface->minLod ) {
			if ( !( refent->reFlags & REFLAG_DEAD_LOD ) ) {
				render_count = surface->minLod;
			}
		}
	}
//----(SA)	end


	if ( render_count > surface->numVerts ) {
		render_count = surface->numVerts;
	}

//DBG_SHOWTIME

	//
	// setup triangle list
	//
	RB_CHECKOVERFLOW( render_count, surface->numTriangles * 3 );

//DBG_SHOWTIME

	collapse_map   = ( int * )( ( byte * )surface + surface->ofsCollapseMap );
	triangles = ( int * )( (byte *)surface + surface->ofsTriangles );
	indexes = surface->numTriangles * 3;
	baseIndex = tess.numIndexes;
	baseVertex = tess.numVertexes;
	oldIndexes = baseIndex;

	tess.numVertexes += render_count;

	pIndexes = (glIndex_t *)&tess.indexes[baseIndex];

//DBG_SHOWTIME

	if ( render_count == surface->numVerts ) {
		for ( j = 0; j < indexes; j++ )
			pIndexes[j] = triangles[j] + baseVertex;
		tess.numIndexes += indexes;
	} else
	{
		int *collapseEnd;

		pCollapse = collapse;
		for ( j = 0; j < render_count; pCollapse++, j++ )
		{
			*pCollapse = j;
		}

		pCollapseMap = &collapse_map[render_count];
		for ( collapseEnd = collapse + surface->numVerts ; pCollapse < collapseEnd; pCollapse++, pCollapseMap++ )
		{
			*pCollapse = collapse[ *pCollapseMap ];
		}

		for ( j = 0 ; j < indexes ; j += 3 )
		{
			p0 = collapse[ *( triangles++ ) ];
			p1 = collapse[ *( triangles++ ) ];
			p2 = collapse[ *( triangles++ ) ];

			// FIXME
			// note:  serious optimization opportunity here,
			//  by sorting the triangles the following "continue"
			//  could have been made into a "break" statement.
			if ( p0 == p1 || p1 == p2 || p2 == p0 ) {
				continue;
			}

			*( pIndexes++ ) = baseVertex + p0;
			*( pIndexes++ ) = baseVertex + p1;
			*( pIndexes++ ) = baseVertex + p2;
			tess.numIndexes += 3;
		}

		baseIndex = tess.numIndexes;
	}

//DBG_SHOWTIME

	//
	// deform the vertexes by the lerped bones
	//
	numVerts = surface->numVerts;
	v = ( mdsVertex_t * )( (byte *)surface + surface->ofsVerts );
	tempVert = ( float * )( tess.xyz + baseVertex );
	tempNormal = ( float * )( tess.normal + baseVertex );
	for ( j = 0; j < render_count; j++, tempVert += 4, tempNormal += 4 ) {
		mdsWeight_t *w;

		VectorClear( tempVert );

		w = v->weights;
		for ( k = 0 ; k < v->numWeights ; k++, w++ ) {
			bone = &bones[w->boneIndex];
			LocalAddScaledMatrixTransformVectorTranslate( w->offset, w->boneWeight, bone->matrix, bone->translation, tempVert );
		}

		LocalMatrixTransformVector( v->normal, bones[v->weights[0].boneIndex].matrix, tempNormal );

		tess.texCoords[baseVertex + j][0][0] = v->texCoords[0];
		tess.texCoords[baseVertex + j][0][1] = v->texCoords[1];

		v = (mdsVertex_t *)&v->weights[v->numWeights];
	}

	DBG_SHOWTIME

#ifndef USE_OPENGLES
	if ( r_bonesDebug->integer ) {
		if ( r_bonesDebug->integer < 3 ) {
			// DEBUG: show the bones as a stick figure with axis at each bone
			int i, *boneRefs = ( int * )( (byte *)surface + surface->ofsBoneReferences );
			for ( i = 0; i < surface->numBoneReferences; i++, boneRefs++ ) {
				bonePtr = &bones[*boneRefs];

				GL_Bind( tr.whiteImage );
				qglLineWidth( 1 );
				qglBegin( GL_LINES );
				for ( j = 0; j < 3; j++ ) {
					VectorClear( vec );
					vec[j] = 1;
					qglColor3fv( vec );
					qglVertex3fv( bonePtr->translation );
					VectorMA( bonePtr->translation, 5, bonePtr->matrix[j], vec );
					qglVertex3fv( vec );
				}
				qglEnd();

				// connect to our parent if it's valid
				if ( validBones[boneInfo[*boneRefs].parent] ) {
					qglLineWidth( 2 );
					qglBegin( GL_LINES );
					qglColor3f( .6,.6,.6 );
					qglVertex3fv( bonePtr->translation );
					qglVertex3fv( bones[boneInfo[*boneRefs].parent].translation );
					qglEnd();
				}

				qglLineWidth( 1 );
			}
		}

		if ( r_bonesDebug->integer == 3 || r_bonesDebug->integer == 4 ) {
			int render_indexes = ( tess.numIndexes - oldIndexes );

			// show mesh edges
			tempVert = ( float * )( tess.xyz + baseVertex );
			tempNormal = ( float * )( tess.normal + baseVertex );

			GL_Bind( tr.whiteImage );
			qglLineWidth( 1 );
			qglBegin( GL_LINES );
			qglColor3f( .0,.0,.8 );

			pIndexes = (glIndex_t *)&tess.indexes[oldIndexes];
			for ( j = 0; j < render_indexes / 3; j++, pIndexes += 3 ) {
				qglVertex3fv( tempVert + 4 * pIndexes[0] );
				qglVertex3fv( tempVert + 4 * pIndexes[1] );

				qglVertex3fv( tempVert + 4 * pIndexes[1] );
				qglVertex3fv( tempVert + 4 * pIndexes[2] );

				qglVertex3fv( tempVert + 4 * pIndexes[2] );
				qglVertex3fv( tempVert + 4 * pIndexes[0] );
			}

			qglEnd();

//----(SA)	track debug stats
			if ( r_bonesDebug->integer == 4 ) {
				totalrv += render_count;
				totalrt += render_indexes / 3;
				totalv += surface->numVerts;
				totalt += surface->numTriangles;
			}
//----(SA)	end

			if ( r_bonesDebug->integer == 3 ) {
				ri.Printf( PRINT_ALL, "Lod %.2f  verts %4d/%4d  tris %4d/%4d  (%.2f%%)\n", lodScale, render_count, surface->numVerts, render_indexes / 3, surface->numTriangles,
						   ( float )( 100.0 * render_indexes / 3 ) / (float) surface->numTriangles );
			}
		}
	}

	if ( r_bonesDebug->integer > 1 ) {
		// dont draw the actual surface
		tess.numIndexes = oldIndexes;
		tess.numVertexes = baseVertex;
		return;
	}
#endif

#ifdef DBG_PROFILE_BONES
	Com_Printf( "\n" );
#endif

}

/*
===============
R_RecursiveBoneListAdd
===============
*/
void R_RecursiveBoneListAdd( int bi, int *boneList, int *numBones, mdsBoneInfo_t *boneInfoList ) {

	if ( boneInfoList[ bi ].parent >= 0 ) {

		R_RecursiveBoneListAdd( boneInfoList[ bi ].parent, boneList, numBones, boneInfoList );

	}

	boneList[ ( *numBones )++ ] = bi;

}

/*
===============
R_GetBoneTag
===============
*/
int R_GetBoneTag( orientation_t *outTag, mdsHeader_t *mds, int startTagIndex, const refEntity_t *refent, const char *tagName ) {

	int i;
	mdsTag_t    *pTag;
	mdsBoneInfo_t *boneInfoList;
	int boneList[ MDS_MAX_BONES ];
	int numBones;

	if ( startTagIndex > mds->numTags ) {
		memset( outTag, 0, sizeof( *outTag ) );
		return -1;
	}

	// find the correct tag

	pTag = ( mdsTag_t * )( (byte *)mds + mds->ofsTags );

	pTag += startTagIndex;

	for ( i = startTagIndex; i < mds->numTags; i++, pTag++ ) {
		if ( !strcmp( pTag->name, tagName ) ) {
			break;
		}
	}

	if ( i >= mds->numTags ) {
		memset( outTag, 0, sizeof( *outTag ) );
		return -1;
	}

	// now build the list of bones we need to calc to get this tag's bone information

	boneInfoList = ( mdsBoneInfo_t * )( (byte *)mds + mds->ofsBones );
	numBones = 0;

	R_RecursiveBoneListAdd( pTag->boneIndex, boneList, &numBones, boneInfoList );

	// calc the bones

	R_CalcBones( (mdsHeader_t *)mds, refent, boneList, numBones );

	// now extract the orientation for the bone that represents our tag

	memcpy( outTag->axis, bones[ pTag->boneIndex ].matrix, sizeof( outTag->axis ) );
	VectorCopy( bones[ pTag->boneIndex ].translation, outTag->origin );

/* code not functional, not in backend
	if (r_bonesDebug->integer == 4) {
		int j;
		// DEBUG: show the tag position/axis
		GL_Bind( tr.whiteImage );
		qglLineWidth( 2 );
		qglBegin( GL_LINES );
		for (j=0; j<3; j++) {
			VectorClear(vec);
			vec[j] = 1;
			qglColor3fv( vec );
			qglVertex3fv( outTag->origin );
			VectorMA( outTag->origin, 8, outTag->axis[j], vec );
			qglVertex3fv( vec );
		}
		qglEnd();

		qglLineWidth( 1 );
	}
*/

	return i;
}

// copied and adapted from tr_mesh.c

/*
=============
R_MDRCullModel
=============
*/

static int R_MDRCullModel( mdrHeader_t *header, trRefEntity_t *ent ) {
	vec3_t		bounds[2];
	mdrFrame_t	*oldFrame, *newFrame;
	int			i, frameSize;

	frameSize = (size_t)( &((mdrFrame_t *)0)->bones[ header->numBones ] );
	
	// compute frame pointers
	newFrame = ( mdrFrame_t * ) ( ( byte * ) header + header->ofsFrames + frameSize * ent->e.frame);
	oldFrame = ( mdrFrame_t * ) ( ( byte * ) header + header->ofsFrames + frameSize * ent->e.oldframe);

	// cull bounding sphere ONLY if this is not an upscaled entity
	if ( !ent->e.nonNormalizedAxes )
	{
		if ( ent->e.frame == ent->e.oldframe )
		{
			switch ( R_CullLocalPointAndRadius( newFrame->localOrigin, newFrame->radius ) )
			{
				// Ummm... yeah yeah I know we don't really have an md3 here.. but we pretend
				// we do. After all, the purpose of mdrs are not that different, are they?
				
				case CULL_OUT:
					tr.pc.c_sphere_cull_md3_out++;
					return CULL_OUT;

				case CULL_IN:
					tr.pc.c_sphere_cull_md3_in++;
					return CULL_IN;

				case CULL_CLIP:
					tr.pc.c_sphere_cull_md3_clip++;
					break;
			}
		}
		else
		{
			int sphereCull, sphereCullB;

			sphereCull  = R_CullLocalPointAndRadius( newFrame->localOrigin, newFrame->radius );
			if ( newFrame == oldFrame ) {
				sphereCullB = sphereCull;
			} else {
				sphereCullB = R_CullLocalPointAndRadius( oldFrame->localOrigin, oldFrame->radius );
			}

			if ( sphereCull == sphereCullB )
			{
				if ( sphereCull == CULL_OUT )
				{
					tr.pc.c_sphere_cull_md3_out++;
					return CULL_OUT;
				}
				else if ( sphereCull == CULL_IN )
				{
					tr.pc.c_sphere_cull_md3_in++;
					return CULL_IN;
				}
				else
				{
					tr.pc.c_sphere_cull_md3_clip++;
				}
			}
		}
	}
	
	// calculate a bounding box in the current coordinate system
	for (i = 0 ; i < 3 ; i++) {
		bounds[0][i] = oldFrame->bounds[0][i] < newFrame->bounds[0][i] ? oldFrame->bounds[0][i] : newFrame->bounds[0][i];
		bounds[1][i] = oldFrame->bounds[1][i] > newFrame->bounds[1][i] ? oldFrame->bounds[1][i] : newFrame->bounds[1][i];
	}

	switch ( R_CullLocalBox( bounds ) )
	{
		case CULL_IN:
			tr.pc.c_box_cull_md3_in++;
			return CULL_IN;
		case CULL_CLIP:
			tr.pc.c_box_cull_md3_clip++;
			return CULL_CLIP;
		case CULL_OUT:
		default:
			tr.pc.c_box_cull_md3_out++;
			return CULL_OUT;
	}
}

/*
=================
R_MDRComputeFogNum

=================
*/

int R_MDRComputeFogNum( mdrHeader_t *header, trRefEntity_t *ent ) {
	int				i, j;
	fog_t			*fog;
	mdrFrame_t		*mdrFrame;
	vec3_t			localOrigin;
	int frameSize;

	if ( tr.refdef.rdflags & RDF_NOWORLDMODEL ) {
		return 0;
	}
	
	frameSize = (size_t)( &((mdrFrame_t *)0)->bones[ header->numBones ] );

	// FIXME: non-normalized axis issues
	mdrFrame = ( mdrFrame_t * ) ( ( byte * ) header + header->ofsFrames + frameSize * ent->e.frame);
	VectorAdd( ent->e.origin, mdrFrame->localOrigin, localOrigin );
	for ( i = 1 ; i < tr.world->numfogs ; i++ ) {
		fog = &tr.world->fogs[i];
		for ( j = 0 ; j < 3 ; j++ ) {
			if ( localOrigin[j] - mdrFrame->radius >= fog->bounds[1][j] ) {
				break;
			}
			if ( localOrigin[j] + mdrFrame->radius <= fog->bounds[0][j] ) {
				break;
			}
		}
		if ( j == 3 ) {
			return i;
		}
	}

	return 0;
}


/*
==============
R_MDRAddAnimSurfaces
==============
*/

int R_ComputeLOD( trRefEntity_t *ent );  // Moved here to not conflict with tr_cmesh

// much stuff in there is just copied from R_AddMd3Surfaces in tr_mesh.c

void R_MDRAddAnimSurfaces( trRefEntity_t *ent ) {
	mdrHeader_t		*header;
	mdrSurface_t	*surface;
	mdrLOD_t		*lod;
	shader_t		*shader;
	skin_t		*skin;
	int				i, j;
	int				lodnum = 0;
	int				fogNum = 0;
	int				cull;
	qboolean	personalModel;

	header = (mdrHeader_t *) tr.currentModel->modelData;
	
	personalModel = (ent->e.renderfx & RF_THIRD_PERSON) && !tr.viewParms.isPortal;
	
	if ( ent->e.renderfx & RF_WRAP_FRAMES )
	{
		ent->e.frame %= header->numFrames;
		ent->e.oldframe %= header->numFrames;
	}	
	
	//
	// Validate the frames so there is no chance of a crash.
	// This will write directly into the entity structure, so
	// when the surfaces are rendered, they don't need to be
	// range checked again.
	//
	if ((ent->e.frame >= header->numFrames) 
		|| (ent->e.frame < 0)
		|| (ent->e.oldframe >= header->numFrames)
		|| (ent->e.oldframe < 0) )
	{
		ri.Printf( PRINT_DEVELOPER, "R_MDRAddAnimSurfaces: no such frame %d to %d for '%s'\n",
			   ent->e.oldframe, ent->e.frame, tr.currentModel->name );
		ent->e.frame = 0;
		ent->e.oldframe = 0;
	}

	//
	// cull the entire model if merged bounding box of both frames
	// is outside the view frustum.
	//
	cull = R_MDRCullModel (header, ent);
	if ( cull == CULL_OUT ) {
		return;
	}	

	// figure out the current LOD of the model we're rendering, and set the lod pointer respectively.
	lodnum = R_ComputeLOD(ent);
	// check whether this model has as that many LODs at all. If not, try the closest thing we got.
	if(header->numLODs <= 0)
		return;
	if(header->numLODs <= lodnum)
		lodnum = header->numLODs - 1;

	lod = (mdrLOD_t *)( (byte *)header + header->ofsLODs);
	for(i = 0; i < lodnum; i++)
	{
		lod = (mdrLOD_t *) ((byte *) lod + lod->ofsEnd);
	}
	
	// set up lighting
	if ( !personalModel || r_shadows->integer > 1 )
	{
		R_SetupEntityLighting( &tr.refdef, ent );
	}

	// fogNum?
	fogNum = R_MDRComputeFogNum( header, ent );

	surface = (mdrSurface_t *)( (byte *)lod + lod->ofsSurfaces );

	for ( i = 0 ; i < lod->numSurfaces ; i++ )
	{
		
		if(ent->e.customShader)
			shader = R_GetShaderByHandle(ent->e.customShader);
		else if(ent->e.customSkin > 0 && ent->e.customSkin < tr.numSkins)
		{
			skin = R_GetSkinByHandle(ent->e.customSkin);
			shader = tr.defaultShader;
			
			for(j = 0; j < skin->numSurfaces; j++)
			{
				if (!strcmp(skin->surfaces[j].name, surface->name))
				{
					shader = skin->surfaces[j].shader;
					break;
				}
			}
		}
		else if(surface->shaderIndex > 0)
			shader = R_GetShaderByHandle( surface->shaderIndex );
		else
			shader = tr.defaultShader;

		// we will add shadows even if the main object isn't visible in the view

		// stencil shadows can't do personal models unless I polyhedron clip
		if ( !personalModel
		        && r_shadows->integer == 2
			&& fogNum == 0
			&& !(ent->e.renderfx & ( RF_NOSHADOW | RF_DEPTHHACK ) )
			&& shader->sort == SS_OPAQUE )
		{
			R_AddDrawSurf( (void *)surface, tr.shadowShader, 0, qfalse );
		}

		// projection shadows work fine with personal models
		if ( r_shadows->integer == 3
			&& fogNum == 0
			&& (ent->e.renderfx & RF_SHADOW_PLANE )
			&& shader->sort == SS_OPAQUE )
		{
			R_AddDrawSurf( (void *)surface, tr.projectionShadowShader, 0, qfalse );
		}

		if ( !personalModel )
			R_AddDrawSurf( (void *)surface, shader, fogNum, qfalse );

		surface = (mdrSurface_t *)( (byte *)surface + surface->ofsEnd );
	}
}

/*
==============
RB_MDRSurfaceAnim
==============
*/
void RB_MDRSurfaceAnim( mdrSurface_t *surface )
{
	int				i, j, k;
	float			frontlerp, backlerp;
	int				*triangles;
	int				indexes;
	int				baseIndex, baseVertex;
	int				numVerts;
	mdrVertex_t		*v;
	mdrHeader_t		*header;
	mdrFrame_t		*frame;
	mdrFrame_t		*oldFrame;
	mdrBone_t		bones[MDR_MAX_BONES], *bonePtr, *bone;

	int			frameSize;

	// don't lerp if lerping off, or this is the only frame, or the last frame...
	//
	if (backEnd.currentEntity->e.oldframe == backEnd.currentEntity->e.frame) 
	{
		backlerp	= 0;	// if backlerp is 0, lerping is off and frontlerp is never used
		frontlerp	= 1;
	} 
	else  
	{
		backlerp	= backEnd.currentEntity->e.backlerp;
		frontlerp	= 1.0f - backlerp;
	}

	header = (mdrHeader_t *)((byte *)surface + surface->ofsHeader);

	frameSize = (size_t)( &((mdrFrame_t *)0)->bones[ header->numBones ] );

	frame = (mdrFrame_t *)((byte *)header + header->ofsFrames +
		backEnd.currentEntity->e.frame * frameSize );
	oldFrame = (mdrFrame_t *)((byte *)header + header->ofsFrames +
		backEnd.currentEntity->e.oldframe * frameSize );

	RB_CHECKOVERFLOW( surface->numVerts, surface->numTriangles * 3 );

	triangles	= (int *) ((byte *)surface + surface->ofsTriangles);
	indexes		= surface->numTriangles * 3;
	baseIndex	= tess.numIndexes;
	baseVertex	= tess.numVertexes;
	
	// Set up all triangles.
	for (j = 0 ; j < indexes ; j++) 
	{
		tess.indexes[baseIndex + j] = baseVertex + triangles[j];
	}
	tess.numIndexes += indexes;

	//
	// lerp all the needed bones
	//
	if ( !backlerp ) 
	{
		// no lerping needed
		bonePtr = frame->bones;
	} 
	else 
	{
		bonePtr = bones;
		
		for ( i = 0 ; i < header->numBones*12 ; i++ ) 
		{
			((float *)bonePtr)[i] = frontlerp * ((float *)frame->bones)[i] + backlerp * ((float *)oldFrame->bones)[i];
		}
	}

	//
	// deform the vertexes by the lerped bones
	//
	numVerts = surface->numVerts;
	v = (mdrVertex_t *) ((byte *)surface + surface->ofsVerts);
	for ( j = 0; j < numVerts; j++ ) 
	{
		vec3_t	tempVert, tempNormal;
		mdrWeight_t	*w;

		VectorClear( tempVert );
		VectorClear( tempNormal );
		w = v->weights;
		for ( k = 0 ; k < v->numWeights ; k++, w++ ) 
		{
			bone = bonePtr + w->boneIndex;
			
			tempVert[0] += w->boneWeight * ( DotProduct( bone->matrix[0], w->offset ) + bone->matrix[0][3] );
			tempVert[1] += w->boneWeight * ( DotProduct( bone->matrix[1], w->offset ) + bone->matrix[1][3] );
			tempVert[2] += w->boneWeight * ( DotProduct( bone->matrix[2], w->offset ) + bone->matrix[2][3] );
			
			tempNormal[0] += w->boneWeight * DotProduct( bone->matrix[0], v->normal );
			tempNormal[1] += w->boneWeight * DotProduct( bone->matrix[1], v->normal );
			tempNormal[2] += w->boneWeight * DotProduct( bone->matrix[2], v->normal );
		}

		tess.xyz[baseVertex + j][0] = tempVert[0];
		tess.xyz[baseVertex + j][1] = tempVert[1];
		tess.xyz[baseVertex + j][2] = tempVert[2];

		tess.normal[baseVertex + j][0] = tempNormal[0];
		tess.normal[baseVertex + j][1] = tempNormal[1];
		tess.normal[baseVertex + j][2] = tempNormal[2];

		tess.texCoords[baseVertex + j][0][0] = v->texCoords[0];
		tess.texCoords[baseVertex + j][0][1] = v->texCoords[1];

		v = (mdrVertex_t *)&v->weights[v->numWeights];
	}

	tess.numVertexes += surface->numVerts;
}


#define MC_MASK_X ((1<<(MC_BITS_X))-1)
#define MC_MASK_Y ((1<<(MC_BITS_Y))-1)
#define MC_MASK_Z ((1<<(MC_BITS_Z))-1)
#define MC_MASK_VECT ((1<<(MC_BITS_VECT))-1)

#define MC_SCALE_VECT (1.0f/(float)((1<<(MC_BITS_VECT-1))-2))

#define MC_POS_X (0)
#define MC_SHIFT_X (0)

#define MC_POS_Y ((((MC_BITS_X))/8))
#define MC_SHIFT_Y ((((MC_BITS_X)%8)))

#define MC_POS_Z ((((MC_BITS_X+MC_BITS_Y))/8))
#define MC_SHIFT_Z ((((MC_BITS_X+MC_BITS_Y)%8)))

#define MC_POS_V11 ((((MC_BITS_X+MC_BITS_Y+MC_BITS_Z))/8))
#define MC_SHIFT_V11 ((((MC_BITS_X+MC_BITS_Y+MC_BITS_Z)%8)))

#define MC_POS_V12 ((((MC_BITS_X+MC_BITS_Y+MC_BITS_Z+MC_BITS_VECT))/8))
#define MC_SHIFT_V12 ((((MC_BITS_X+MC_BITS_Y+MC_BITS_Z+MC_BITS_VECT)%8)))

#define MC_POS_V13 ((((MC_BITS_X+MC_BITS_Y+MC_BITS_Z+MC_BITS_VECT*2))/8))
#define MC_SHIFT_V13 ((((MC_BITS_X+MC_BITS_Y+MC_BITS_Z+MC_BITS_VECT*2)%8)))

#define MC_POS_V21 ((((MC_BITS_X+MC_BITS_Y+MC_BITS_Z+MC_BITS_VECT*3))/8))
#define MC_SHIFT_V21 ((((MC_BITS_X+MC_BITS_Y+MC_BITS_Z+MC_BITS_VECT*3)%8)))

#define MC_POS_V22 ((((MC_BITS_X+MC_BITS_Y+MC_BITS_Z+MC_BITS_VECT*4))/8))
#define MC_SHIFT_V22 ((((MC_BITS_X+MC_BITS_Y+MC_BITS_Z+MC_BITS_VECT*4)%8)))

#define MC_POS_V23 ((((MC_BITS_X+MC_BITS_Y+MC_BITS_Z+MC_BITS_VECT*5))/8))
#define MC_SHIFT_V23 ((((MC_BITS_X+MC_BITS_Y+MC_BITS_Z+MC_BITS_VECT*5)%8)))

#define MC_POS_V31 ((((MC_BITS_X+MC_BITS_Y+MC_BITS_Z+MC_BITS_VECT*6))/8))
#define MC_SHIFT_V31 ((((MC_BITS_X+MC_BITS_Y+MC_BITS_Z+MC_BITS_VECT*6)%8)))

#define MC_POS_V32 ((((MC_BITS_X+MC_BITS_Y+MC_BITS_Z+MC_BITS_VECT*7))/8))
#define MC_SHIFT_V32 ((((MC_BITS_X+MC_BITS_Y+MC_BITS_Z+MC_BITS_VECT*7)%8)))

#define MC_POS_V33 ((((MC_BITS_X+MC_BITS_Y+MC_BITS_Z+MC_BITS_VECT*8))/8))
#define MC_SHIFT_V33 ((((MC_BITS_X+MC_BITS_Y+MC_BITS_Z+MC_BITS_VECT*8)%8)))

void MC_UnCompress(float mat[3][4],const unsigned char * comp)
{
	int val;

	val=(int)((unsigned short *)(comp))[0];
	val-=1<<(MC_BITS_X-1);
	mat[0][3]=((float)(val))*MC_SCALE_X;

	val=(int)((unsigned short *)(comp))[1];
	val-=1<<(MC_BITS_Y-1);
	mat[1][3]=((float)(val))*MC_SCALE_Y;

	val=(int)((unsigned short *)(comp))[2];
	val-=1<<(MC_BITS_Z-1);
	mat[2][3]=((float)(val))*MC_SCALE_Z;

	val=(int)((unsigned short *)(comp))[3];
	val-=1<<(MC_BITS_VECT-1);
	mat[0][0]=((float)(val))*MC_SCALE_VECT;

	val=(int)((unsigned short *)(comp))[4];
	val-=1<<(MC_BITS_VECT-1);
	mat[0][1]=((float)(val))*MC_SCALE_VECT;

	val=(int)((unsigned short *)(comp))[5];
	val-=1<<(MC_BITS_VECT-1);
	mat[0][2]=((float)(val))*MC_SCALE_VECT;


	val=(int)((unsigned short *)(comp))[6];
	val-=1<<(MC_BITS_VECT-1);
	mat[1][0]=((float)(val))*MC_SCALE_VECT;

	val=(int)((unsigned short *)(comp))[7];
	val-=1<<(MC_BITS_VECT-1);
	mat[1][1]=((float)(val))*MC_SCALE_VECT;

	val=(int)((unsigned short *)(comp))[8];
	val-=1<<(MC_BITS_VECT-1);
	mat[1][2]=((float)(val))*MC_SCALE_VECT;


	val=(int)((unsigned short *)(comp))[9];
	val-=1<<(MC_BITS_VECT-1);
	mat[2][0]=((float)(val))*MC_SCALE_VECT;

	val=(int)((unsigned short *)(comp))[10];
	val-=1<<(MC_BITS_VECT-1);
	mat[2][1]=((float)(val))*MC_SCALE_VECT;

	val=(int)((unsigned short *)(comp))[11];
	val-=1<<(MC_BITS_VECT-1);
	mat[2][2]=((float)(val))*MC_SCALE_VECT;
}