/*
Copyright (C) 1996-2001 Id Software, Inc.
Copyright (C) 2002-2009 John Fitzgibbons and others
Copyright (C) 2010-2014 QuakeSpasm developers

This program 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 2
of the License, or (at your option) any later version.

This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// gl_mesh.c: triangle model functions

#include "quakedef.h"


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

ALIAS MODEL DISPLAY LIST GENERATION

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

#define countof(x) (sizeof(x)/sizeof((x)[0]))

/*
================
GL_MakeAliasModelDisplayLists

Saves data needed to build the VBO for this model on the hunk. Afterwards this
is copied to Mod_Extradata.

Original code by MH from RMQEngine
================
*/
void GL_MakeAliasModelDisplayLists (qmodel_t *m, aliashdr_t *paliashdr)
{
	int i, j;
	int maxverts_vbo;
	unsigned short *indexes;
	trivertx_t *verts;
	aliasmesh_t *desc;

	// there can never be more than this number of verts and we just put them all on the hunk
	//	front/back logic says we can never have more than numverts*2
	maxverts_vbo = paliashdr->numverts * 2;
	desc = (aliasmesh_t *) Hunk_Alloc (sizeof (aliasmesh_t) * maxverts_vbo);

	// there will always be this number of indexes
	indexes = (unsigned short *) Hunk_Alloc (sizeof (unsigned short) * paliashdr->numtris * 3);

	paliashdr->indexes = (intptr_t) indexes - (intptr_t) paliashdr;
	paliashdr->meshdesc = (intptr_t) desc - (intptr_t) paliashdr;
	paliashdr->numindexes = 0;
	paliashdr->numverts_vbo = 0;

	for (i = 0; i < paliashdr->numtris; i++)
	{
		for (j = 0; j < 3; j++)
		{
			int v;

			// index into hdr->vertexes
			unsigned short vertindex = triangles[i].vertindex[j];

			// basic s/t coords
			int s = stverts[vertindex].s;
			int t = stverts[vertindex].t;

			// check for back side and adjust texcoord s
			if (!triangles[i].facesfront && stverts[vertindex].onseam) s += paliashdr->skinwidth / 2;

			// see does this vert already exist
			for (v = 0; v < paliashdr->numverts_vbo; v++)
			{
				// it could use the same xyz but have different s and t
				if (desc[v].vertindex == vertindex && (int) desc[v].st[0] == s && (int) desc[v].st[1] == t)
				{
					// exists; emit an index for it
					indexes[paliashdr->numindexes++] = v;

					// no need to check any more
					break;
				}
			}

			if (v == paliashdr->numverts_vbo)
			{
				// doesn't exist; emit a new vert and index
				indexes[paliashdr->numindexes++] = paliashdr->numverts_vbo;

				desc[paliashdr->numverts_vbo].vertindex = vertindex;
				desc[paliashdr->numverts_vbo].st[0] = s;
				desc[paliashdr->numverts_vbo++].st[1] = t;
			}
		}
	}

	switch(paliashdr->poseverttype)
	{
	case PV_QUAKEFORGE:
		verts = (trivertx_t *) Hunk_Alloc (paliashdr->nummorphposes * paliashdr->numverts_vbo*2 * sizeof(*verts));
		paliashdr->vertexes = (byte *)verts - (byte *)paliashdr;
		for (i=0 ; i<paliashdr->nummorphposes ; i++)
			for (j=0 ; j<paliashdr->numverts_vbo ; j++)
			{
				verts[i*paliashdr->numverts_vbo*2 + j] = poseverts_mdl[i][desc[j].vertindex];
				verts[i*paliashdr->numverts_vbo*2 + j + paliashdr->numverts_vbo] = poseverts_mdl[i][desc[j].vertindex + paliashdr->numverts_vbo];
			}
		break;
	case PV_QUAKE1:
		verts = (trivertx_t *) Hunk_Alloc (paliashdr->nummorphposes * paliashdr->numverts_vbo * sizeof(*verts));
		paliashdr->vertexes = (byte *)verts - (byte *)paliashdr;
		for (i=0 ; i<paliashdr->nummorphposes ; i++)
			for (j=0 ; j<paliashdr->numverts_vbo ; j++)
				verts[i*paliashdr->numverts_vbo + j] = poseverts_mdl[i][desc[j].vertindex];
		break;
	case PV_IQM:
	case PV_QUAKE3:
		break;	//invalid here.
	}
}

#define NUMVERTEXNORMALS	 162
extern	float	r_avertexnormals[NUMVERTEXNORMALS][3];

/*
================
GLMesh_LoadVertexBuffer

Upload the given alias model's mesh to a VBO

Original code by MH from RMQEngine

may update the mesh vbo/ebo offsets.
================
*/
void GLMesh_LoadVertexBuffer (qmodel_t *m, aliashdr_t *mainhdr)
{
	//we always need vertex array data.
	//if we don't support vbos(gles?) then we just use system memory.
	//if we're not using glsl(gles1?), then we don't actually need all the data, but we do still need some so its easier to just alloc the lot.
	int totalvbosize = 0;
	const aliasmesh_t *desc;
	const void *trivertexes;
	byte *ebodata;
	byte *vbodata;
	int f;
	aliashdr_t *hdr;
	unsigned int numindexes, numverts;
	intptr_t stofs;
	intptr_t vertofs;

	//count how much space we're going to need.
	for(hdr = mainhdr, numverts = 0, numindexes = 0; ; )
	{
		switch(hdr->poseverttype)
		{
		case PV_QUAKE1:
			totalvbosize += (hdr->nummorphposes * hdr->numverts_vbo * sizeof (meshxyz_mdl_t)); // ericw -- what RMQEngine called nummeshframes is called numposes in QuakeSpasm
			break;
		case PV_QUAKEFORGE:
			totalvbosize += (hdr->nummorphposes * hdr->numverts_vbo * sizeof (meshxyz_mdl16_t));
			break;
		case PV_QUAKE3:
			totalvbosize += (hdr->nummorphposes * hdr->numverts_vbo * sizeof (meshxyz_md3_t));
			break;
		case PV_IQM:
			totalvbosize += (hdr->nummorphposes * hdr->numverts_vbo * sizeof (iqmvert_t));
			break;
		}

		numverts += hdr->numverts_vbo;
		numindexes += hdr->numindexes;

		if (hdr->nextsurface)
			hdr = (aliashdr_t*)((byte*)hdr + hdr->nextsurface);
		else
			break;
	}
	hdr = NULL;

	vertofs = 0;
	totalvbosize = (totalvbosize+7)&~7;	//align it.
	stofs = totalvbosize;
	totalvbosize += (numverts * sizeof (meshst_t));

	if (!totalvbosize) return;
	if (!numindexes) return;

	//create an elements buffer
	ebodata = (byte *) malloc(numindexes * sizeof(unsigned short));
	if (!ebodata)
		return;	//fatal

	// create the vertex buffer (empty)
	vbodata = (byte *) malloc(totalvbosize);
	if (!vbodata)
	{	//fatal
		free(ebodata);
		return;
	}
	memset(vbodata, 0, totalvbosize);

	numindexes = 0;

	for(hdr = mainhdr, numverts = 0, numindexes = 0; ; )
	{
		// grab the pointers to data in the extradata
		desc = (aliasmesh_t *) ((byte *) hdr + hdr->meshdesc);
		trivertexes = (void *) ((byte *)hdr + hdr->vertexes);

		//submit the index data.
		hdr->eboofs = numindexes * sizeof (unsigned short);
		numindexes += hdr->numindexes;
		memcpy(ebodata + hdr->eboofs, (short *) ((byte *) hdr + hdr->indexes), hdr->numindexes * sizeof (unsigned short));

		hdr->vbovertofs = vertofs;

	// fill in the vertices at the start of the buffer
		switch(hdr->poseverttype)
		{
		case PV_QUAKE1:
			for (f = 0; f < hdr->nummorphposes; f++) // ericw -- what RMQEngine called nummeshframes is called numposes in QuakeSpasm
			{
				int v;
				meshxyz_mdl_t *xyz = (meshxyz_mdl_t *) (vbodata + vertofs);
				const trivertx_t *tv = (const trivertx_t*)trivertexes + (hdr->numverts_vbo * f);
				vertofs += hdr->numverts_vbo * sizeof (*xyz);

				for (v = 0; v < hdr->numverts_vbo; v++, tv++)
				{
					xyz[v].xyz[0] = tv->v[0];
					xyz[v].xyz[1] = tv->v[1];
					xyz[v].xyz[2] = tv->v[2];
					xyz[v].xyz[3] = 1;	// need w 1 for 4 byte vertex compression

					// map the normal coordinates in [-1..1] to [-127..127] and store in an unsigned char.
					// this introduces some error (less than 0.004), but the normals were very coarse
					// to begin with
					xyz[v].normal[0] = 127 * r_avertexnormals[tv->lightnormalindex][0];
					xyz[v].normal[1] = 127 * r_avertexnormals[tv->lightnormalindex][1];
					xyz[v].normal[2] = 127 * r_avertexnormals[tv->lightnormalindex][2];
					xyz[v].normal[3] = 0;	// unused; for 4-byte alignment
				}
			}
			break;
		case PV_QUAKEFORGE:
			for (f = 0; f < hdr->nummorphposes; f++) // ericw -- what RMQEngine called nummeshframes is called numposes in QuakeSpasm
			{
				int v;
				meshxyz_mdl16_t *xyz = (meshxyz_mdl16_t *) (vbodata + vertofs);
				const trivertx_t *tv = (const trivertx_t*)trivertexes + (hdr->numverts_vbo*2 * f);
				vertofs += hdr->numverts_vbo * sizeof (*xyz);

				for (v = 0; v < hdr->numverts_vbo; v++, tv++)
				{
					xyz[v].xyz[0] = (tv->v[0]<<8) | tv[hdr->numverts_vbo].v[0];
					xyz[v].xyz[1] = (tv->v[1]<<8) | tv[hdr->numverts_vbo].v[0];
					xyz[v].xyz[2] = (tv->v[2]<<8) | tv[hdr->numverts_vbo].v[0];
					xyz[v].xyz[3] = 1;	// need w 1 for 4 byte vertex compression

					// map the normal coordinates in [-1..1] to [-127..127] and store in an unsigned char.
					// this introduces some error (less than 0.004), but the normals were very coarse
					// to begin with
					xyz[v].normal[0] = 127 * r_avertexnormals[tv->lightnormalindex][0];
					xyz[v].normal[1] = 127 * r_avertexnormals[tv->lightnormalindex][1];
					xyz[v].normal[2] = 127 * r_avertexnormals[tv->lightnormalindex][2];
					xyz[v].normal[3] = 0;	// unused; for 4-byte alignment
				}
			}
			break;
		case PV_QUAKE3:
			for (f = 0; f < hdr->nummorphposes; f++) // ericw -- what RMQEngine called nummeshframes is called numposes in QuakeSpasm
			{
				int v;
				meshxyz_md3_t *xyz = (meshxyz_md3_t *) (vbodata + vertofs);
				const md3XyzNormal_t *tv = (const md3XyzNormal_t*)trivertexes + (hdr->numverts_vbo * f);
				float lat,lng;
				vertofs += hdr->numverts_vbo * sizeof (*xyz);

				for (v = 0; v < hdr->numverts_vbo; v++, tv++)
				{
					xyz[v].xyz[0] = tv->xyz[0];
					xyz[v].xyz[1] = tv->xyz[1];
					xyz[v].xyz[2] = tv->xyz[2];
					xyz[v].xyz[3] = 1;	// need w 1 for 4 byte vertex compression

					// map the normal coordinates in [-1..1] to [-127..127] and store in an unsigned char.
					// this introduces some error (less than 0.004), but the normals were very coarse
					// to begin with
					lat = (float)tv->latlong[0] * (2 * M_PI)*(1.0 / 255.0);
					lng = (float)tv->latlong[1] * (2 * M_PI)*(1.0 / 255.0);
					xyz[v].normal[0] = 127 * cos ( lng ) * sin ( lat );
					xyz[v].normal[1] = 127 * sin ( lng ) * sin ( lat );
					xyz[v].normal[2] = 127 * cos ( lat );
					xyz[v].normal[3] = 0;	// unused; for 4-byte alignment
				}
			}
			break;
		case PV_IQM:
			for (f = 0; f < hdr->nummorphposes; f++) // ericw -- what RMQEngine called nummeshframes is called numposes in QuakeSpasm
			{
				int v;
				iqmvert_t *xyz = (iqmvert_t *) (vbodata + vertofs);
				const iqmvert_t *tv = (const iqmvert_t*)trivertexes + (hdr->numverts_vbo * f);
				vertofs += hdr->numverts_vbo * sizeof (*xyz);

				for (v = 0; v < hdr->numverts_vbo; v++, tv++)
					xyz[v] = *tv;
			}
			break;
		}

		// fill in the ST coords at the end of the buffer
		{
			meshst_t *st;
			float hscale, vscale;

			//johnfitz -- padded skins
			hscale = (float)hdr->skinwidth/(float)TexMgr_PadConditional(hdr->skinwidth);
			vscale = (float)hdr->skinheight/(float)TexMgr_PadConditional(hdr->skinheight);
			//johnfitz

			hdr->vbostofs = stofs; 
			st = (meshst_t *) (vbodata + stofs);
			stofs += hdr->numverts_vbo*sizeof(*st);
			switch(hdr->poseverttype)
			{
			case PV_QUAKE3:
				for (f = 0; f < hdr->numverts_vbo; f++)
				{	//md3 has floating-point skin coords. use the values directly.
					st[f].st[0] = hscale * desc[f].st[0];
					st[f].st[1] = vscale * desc[f].st[1];
				}
				break;
			case PV_QUAKEFORGE:
			case PV_QUAKE1:
				for (f = 0; f < hdr->numverts_vbo; f++)
				{
					st[f].st[0] = hscale * ((float) desc[f].st[0] + 0.5f) / (float) hdr->skinwidth;
					st[f].st[1] = vscale * ((float) desc[f].st[1] + 0.5f) / (float) hdr->skinheight;
				}
				break;
			case PV_IQM:
				//st coords are interleaved.
				break;
			}
		}

		if (hdr->nextsurface)
			hdr = (aliashdr_t*)((byte*)hdr + hdr->nextsurface);
		else
			break;
	}
	hdr = NULL;

	if (gl_vbo_able)
	{
		// upload indexes buffer
		GL_DeleteBuffersFunc (1, &m->meshindexesvbo);
		GL_GenBuffersFunc (1, &m->meshindexesvbo);
		GL_BindBufferFunc (GL_ELEMENT_ARRAY_BUFFER, m->meshindexesvbo);
		GL_BufferDataFunc (GL_ELEMENT_ARRAY_BUFFER, numindexes * sizeof (unsigned short), ebodata, GL_STATIC_DRAW);

		// upload vertexes buffer
		GL_DeleteBuffersFunc (1, &m->meshvbo);
		GL_GenBuffersFunc (1, &m->meshvbo);
		GL_BindBufferFunc (GL_ARRAY_BUFFER, m->meshvbo);
		GL_BufferDataFunc (GL_ARRAY_BUFFER, totalvbosize, vbodata, GL_STATIC_DRAW);

		free (vbodata);
		free (ebodata);

		m->meshvboptr = NULL;
		m->meshindexesvboptr = NULL;
	}
	else
	{
		m->meshvboptr = vbodata;
		m->meshindexesvboptr = ebodata;
	}

// invalidate the cached bindings
	GL_ClearBufferBindings ();
}

/*
================
GLMesh_LoadVertexBuffers

Loop over all precached alias models, and upload each one to a VBO.
================
*/
void GLMesh_LoadVertexBuffers (void)
{
	int j;
	qmodel_t *m;
	aliashdr_t *hdr;

	for (j = 1; j < MAX_MODELS; j++)
	{
		if (!(m = cl.model_precache[j])) break;
		if (m->type != mod_alias) continue;

		hdr = (aliashdr_t *) Mod_Extradata (m);
		
		GLMesh_LoadVertexBuffer (m, hdr);
	}
}

/*
================
GLMesh_DeleteVertexBuffers

Delete VBOs for all loaded alias models
================
*/
void GLMesh_DeleteVertexBuffers (void)
{
	int j;
	qmodel_t *m;
	
	if (!gl_vbo_able)
		return;
	
	for (j = 1; j < MAX_MODELS; j++)
	{
		if (!(m = cl.model_precache[j])) break;
		if (m->type != mod_alias) continue;

		if (m->meshvbo)
			GL_DeleteBuffersFunc (1, &m->meshvbo);
		m->meshvbo = 0;
		free(m->meshvboptr);
		m->meshvboptr = NULL;

		if (m->meshindexesvbo)
			GL_DeleteBuffersFunc (1, &m->meshindexesvbo);
		m->meshindexesvbo = 0;
		free(m->meshindexesvboptr);
		m->meshindexesvboptr = NULL;
	}

	GL_ClearBufferBindings ();
}






//from gl_model.c
extern char	loadname[];	// for hunk tags
void Mod_CalcAliasBounds (aliashdr_t *a);


#define MD3_VERSION 15
//structures from Tenebrae
typedef struct {
	int			ident;
	int			version;

	char		name[64];

	int			flags;	//assumed to match quake1 models, for lack of somewhere better.

	int			numFrames;
	int			numTags;
	int			numSurfaces;

	int			numSkins;

	int			ofsFrames;
	int			ofsTags;
	int			ofsSurfaces;
	int			ofsEnd;
} md3Header_t;

//then has header->numFrames of these at header->ofs_Frames
typedef struct md3Frame_s {
	vec3_t		bounds[2];
	vec3_t		localOrigin;
	float		radius;
	char		name[16];
} md3Frame_t;

//there are header->numSurfaces of these at header->ofsSurfaces, following from ofsEnd
typedef struct {
	int		ident;				//

	char	name[64];	// polyset name

	int		flags;
	int		numFrames;			// all surfaces in a model should have the same

	int		numShaders;			// all surfaces in a model should have the same
	int		numVerts;

	int		numTriangles;
	int		ofsTriangles;

	int		ofsShaders;			// offset from start of md3Surface_t
	int		ofsSt;				// texture coords are common for all frames
	int		ofsXyzNormals;		// numVerts * numFrames

	int		ofsEnd;				// next surface follows
} md3Surface_t;

//at surf+surf->ofsXyzNormals
/*typedef struct {
	short		xyz[3];
	byte		latlong[2];
} md3XyzNormal_t;*/

//surf->numTriangles at surf+surf->ofsTriangles
typedef struct {
	int			indexes[3];
} md3Triangle_t;

//surf->numVerts at surf+surf->ofsSt
typedef struct {
	float		s;
	float		t;
} md3St_t;

typedef struct {
	char			name[64];
	int				shaderIndex;
} md3Shader_t;



void Mod_LoadMD3Model (qmodel_t *mod, void *buffer)
{
	md3Header_t			*pinheader;
	md3Surface_t		*pinsurface;
	md3Frame_t			*pinframes;
	md3Triangle_t		*pintriangle;
	unsigned short		*poutindexes;
	md3XyzNormal_t		*pinvert;
	md3XyzNormal_t		*poutvert;
	md3St_t				*pinst;
	aliasmesh_t			*poutst;
	md3Shader_t			*pinshader;
	int					size;
	int					start, end, total;
	int					ival, j;
	int					numsurfs, surf;
	int					numframes;
	aliashdr_t			*outhdr;

	start = Hunk_LowMark ();

	pinheader = (md3Header_t *)buffer;

	ival = LittleLong (pinheader->version);
	if (ival != MD3_VERSION)
		Sys_Error ("%s has wrong version number (%i should be %i)",
				 mod->name, ival, MD3_VERSION);

	numsurfs = LittleLong (pinheader->numSurfaces);
	numframes = LittleLong(pinheader->numFrames);

	if (numframes > MAXALIASFRAMES)
		Sys_Error ("%s has too many frames (%i vs %i)",
				 mod->name, numframes, MAXALIASFRAMES);
	if (!numsurfs)
		Sys_Error ("%s has nosurfaces", mod->name);

	pinframes = (md3Frame_t*)((byte*)buffer + LittleLong(pinheader->ofsFrames));
//
// allocate space for a working header, plus all the data except the frames,
// skin and group info
//
	size	= sizeof(aliashdr_t) + (numframes-1) * sizeof (outhdr->frames[0]);
	outhdr = (aliashdr_t *) Hunk_AllocName (size * numsurfs, loadname);

	for (surf = 0, pinsurface = (md3Surface_t*)((byte*)buffer + LittleLong(pinheader->ofsSurfaces)); surf < numsurfs; surf++, pinsurface = (md3Surface_t*)((byte*)pinsurface + LittleLong(pinsurface->ofsEnd)))
	{
		aliashdr_t	*osurf = (aliashdr_t*)((byte*)outhdr + size*surf);
		if (LittleLong(pinsurface->ident) != (('I'<<0)|('D'<<8)|('P'<<16)|('3'<<24)))
			Sys_Error ("%s corrupt surface ident", mod->name);
		if (LittleLong(pinsurface->numFrames) != numframes)
			Sys_Error ("%s mismatched framecounts", mod->name);

		if (surf+1 < numsurfs)
			osurf->nextsurface = size;
		else
			osurf->nextsurface = 0;
		
		osurf->poseverttype = PV_QUAKE3;
		osurf->numverts_vbo = osurf->numverts = LittleLong(pinsurface->numVerts);
		pinvert = (md3XyzNormal_t*)((byte*)pinsurface + LittleLong(pinsurface->ofsXyzNormals));
		poutvert = (md3XyzNormal_t *) Hunk_Alloc (numframes * osurf->numverts * sizeof(*poutvert));
		osurf->vertexes = (byte *)poutvert - (byte *)osurf;
		for (ival = 0; ival < numframes; ival++)
		{
			osurf->frames[ival].firstpose = ival;
			osurf->frames[ival].numposes = 1;
			osurf->frames[ival].interval = 0.1;

			q_strlcpy(osurf->frames[ival].name, pinframes->name, sizeof(osurf->frames[ival].name));
			for (j = 0; j < 3; j++)
			{	//fixme...
				osurf->frames[ival].bboxmin.v[j] = 0;
				osurf->frames[ival].bboxmax.v[j] = 255;
			}

			for (j=0 ; j<osurf->numverts ; j++)
				poutvert[j] = pinvert[j];
			poutvert += osurf->numverts;
			pinvert += osurf->numverts;
		}
		osurf->nummorphposes = osurf->numframes = numframes;

		osurf->numtris = LittleLong(pinsurface->numTriangles);
		osurf->numindexes = osurf->numtris*3;
		pintriangle = (md3Triangle_t*)((byte*)pinsurface + LittleLong(pinsurface->ofsTriangles));
		poutindexes = (unsigned short *) Hunk_Alloc (sizeof (*poutindexes) * osurf->numindexes);
		osurf->indexes = (intptr_t) poutindexes - (intptr_t) osurf;
		for (ival = 0; ival < osurf->numtris; ival++, pintriangle++, poutindexes+=3)
		{
			for (j = 0; j < 3; j++)
				poutindexes[j] = LittleLong(pintriangle->indexes[j]);
		}

		for (j = 0; j < 3; j++)
		{
			osurf->scale_origin[j] = 0;
			osurf->scale[j] = 1/64.0;
		}

		//guess at skin sizes
		osurf->skinwidth = 320;
		osurf->skinheight = 200;

		//load the textures
		if (!isDedicated)
		{
			pinshader = (md3Shader_t*)((byte*)pinsurface + LittleLong(pinsurface->ofsShaders));
			osurf->numskins = LittleLong(pinsurface->numShaders);
			for (j = 0; j < osurf->numskins; j++, pinshader++)
			{
				char texturename[MAX_QPATH];
				char fullbrightname[MAX_QPATH];
				char *ext;
				//texture names in md3s are kinda fucked. they could be just names relative to the mdl, or full paths, or just simple shader names.
				//our texture manager is too lame to scan all 1000 possibilities
				if (strchr(pinshader->name, '/') || strchr(pinshader->name, '\\'))
				{	//so if there's a path then we want to use that.
					q_strlcpy(texturename, pinshader->name, sizeof(texturename));
				}
				else
				{	//and if there's no path then we want to prefix it with our own.
					q_strlcpy(texturename, mod->name, sizeof(texturename));
					*(char*)COM_SkipPath(texturename) = 0;
					//and concat the specified name
					q_strlcat(texturename, pinshader->name, sizeof(texturename));
				}
				//and make sure there's no extensions. these get ignored in q3, which is kinda annoying, but this is an md3 and standards are standards (and it makes luma easier).
				ext = (char*)COM_FileGetExtension(texturename);
				if (*ext)
					*--ext = 0;
				//luma has an extra postfix.
				q_snprintf(fullbrightname, sizeof(fullbrightname), "%s_luma", texturename);
				osurf->gltextures[j][0] = TexMgr_LoadImage(mod, texturename, osurf->skinwidth, osurf->skinheight, SRC_EXTERNAL, NULL, texturename, 0, TEXPREF_PAD|TEXPREF_ALPHA|TEXPREF_NOBRIGHT|TEXPREF_MIPMAP);
				osurf->fbtextures[j][0] = TexMgr_LoadImage(mod, fullbrightname, osurf->skinwidth, osurf->skinheight, SRC_EXTERNAL, NULL, texturename, 0, TEXPREF_PAD|TEXPREF_ALPHA|TEXPREF_FULLBRIGHT|TEXPREF_MIPMAP);
				osurf->gltextures[j][3] = osurf->gltextures[j][2] = osurf->gltextures[j][1] = osurf->gltextures[j][0];
				osurf->fbtextures[j][3] = osurf->fbtextures[j][2] = osurf->fbtextures[j][1] = osurf->fbtextures[j][0];
			}
			if (osurf->numskins)
			{
				osurf->skinwidth = osurf->gltextures[0][0]->source_width;
				osurf->skinheight = osurf->gltextures[0][0]->source_height;
			}
		}

		//and figure out the texture coords properly, now we know the actual sizes.
		pinst = (md3St_t*)((byte*)pinsurface + LittleLong(pinsurface->ofsSt));
		poutst = (aliasmesh_t *) Hunk_Alloc (sizeof (*poutst) * osurf->numverts);
		osurf->meshdesc = (intptr_t) poutst - (intptr_t) osurf;
		for (j = 0; j < osurf->numverts; j++)
		{
			poutst[j].vertindex = j;	//how is this useful?
			poutst[j].st[0] = pinst->s;
			poutst[j].st[1] = pinst->t;
		}
	}
	GLMesh_LoadVertexBuffer (mod, outhdr);

	//small violation of the spec, but it seems like noone else uses it.
	mod->flags = LittleLong (pinheader->flags);


	mod->type = mod_alias;

	Mod_CalcAliasBounds (outhdr); //johnfitz

//
// move the complete, relocatable alias model to the cache
//
	end = Hunk_LowMark ();
	total = end - start;

	Cache_Alloc (&mod->cache, total, loadname);
	if (!mod->cache.data)
		return;
	memcpy (mod->cache.data, outhdr, total);

	Hunk_FreeToLowMark (start);
}

/*
=================================================================
InterQuake Models.
=================================================================

Header:
*/
//Copyright (c) 2010-2019 Lee Salzman
//MIT License etc at: https://github.com/lsalzman/iqm
#define IQM_MAGIC "INTERQUAKEMODEL"
#define IQM_VERSION 2

struct iqmheader
{
    char magic[16];
    unsigned int version;
    unsigned int filesize;
    unsigned int flags;
    unsigned int num_text, ofs_text;			//text strings
    unsigned int num_meshes, ofs_meshes;		//surface info
    unsigned int num_vertexarrays, num_vertexes, ofs_vertexarrays;	//for loading vertex data
    unsigned int num_triangles, ofs_triangles, ofs_adjacency;	//the index data+neighbours(which we ignore)
    unsigned int num_joints, ofs_joints;		//mesh joints (base pose info)
    unsigned int num_poses, ofs_poses;			//animated joints (num_poses should match num_joints)
    unsigned int num_anims, ofs_anims;			//animations info
    unsigned int num_frames, num_framechannels, ofs_frames, ofs_bounds; //the actual per-pose(aka:single-frame) data
    unsigned int num_comment, ofs_comment;		//extra stuff
    unsigned int num_extensions, ofs_extensions;//extra stuff
};

struct iqmmesh
{
    unsigned int name;
    unsigned int material;
    unsigned int first_vertex, num_vertexes;
    unsigned int first_triangle, num_triangles;
};

enum
{
    IQM_POSITION     = 0,
    IQM_TEXCOORD     = 1,
    IQM_NORMAL       = 2,
    IQM_TANGENT      = 3,
    IQM_BLENDINDEXES = 4,
    IQM_BLENDWEIGHTS = 5,
    IQM_COLOR        = 6,
    IQM_CUSTOM       = 0x10
};

enum
{
    IQM_BYTE   = 0,
    IQM_UBYTE  = 1,
    IQM_SHORT  = 2,
    IQM_USHORT = 3,
    IQM_INT    = 4,
    IQM_UINT   = 5,
    IQM_HALF   = 6,
    IQM_FLOAT  = 7,
    IQM_DOUBLE = 8
};

/*struct iqmtriangle
{
    unsigned int vertex[3];
};

struct iqmadjacency
{
    unsigned int triangle[3];
};

struct iqmjointv1
{
    unsigned int name;
    int parent;
    float translate[3], rotate[3], scale[3];
};*/

struct iqmjoint
{
    unsigned int name;
    int parent;
    float translate[3], rotate[4], scale[3];
};

/*struct iqmposev1
{
    int parent;
    unsigned int mask;
    float channeloffset[9];
    float channelscale[9];
};*/

struct iqmpose
{
    int parent;
    unsigned int mask;
    float channeloffset[10];
    float channelscale[10];
};

struct iqmanim
{
    unsigned int name;
    unsigned int first_frame, num_frames;
    float framerate;
    unsigned int flags;
};

enum
{
    IQM_LOOP = 1<<0
};

struct iqmvertexarray
{
    unsigned int type;
    unsigned int flags;
    unsigned int format;
    unsigned int size;
    unsigned int offset;
};

/*struct iqmbounds
{
    float bbmin[3], bbmax[3];
    float xyradius, radius;
};

struct iqmextension
{
    unsigned int name;
    unsigned int num_data, ofs_data;
    unsigned int ofs_extensions; // pointer to next extension
};*/

//IQM Implementation: Copyright 2019 spike, licensed like the rest of quakespasm.
static void IQM_LoadVertexes_Float(float *o, size_t c, size_t numverts, const byte *buffer, const struct iqmvertexarray *va)
{
	size_t j, k;
	if (c != va->size)
		return;	//erk, too lazy to handle weirdness.
	switch(va->format)
	{
//	case IQM_BYTE:
	case IQM_UBYTE:
		{	//weights+colours are often normalised bytes.
			const byte *in = (const byte*)(buffer+va->offset);
			for (j = 0; j < numverts; j++, in+=va->size, o+=sizeof(iqmvert_t)/sizeof(*o))
			{
				for (k = 0; k < c; k++)
					o[k] = in[k]/255.0;
			}
		}
		break;
//	case IQM_SHORT:
//	case IQM_USHORT:
//	case IQM_INT:
//	case IQM_UINT:
//	case IQM_HALF:
	case IQM_FLOAT:
		{
			const float *in = (const float*)(buffer+va->offset);
			for (j = 0; j < numverts; j++, in+=va->size, o+=sizeof(iqmvert_t)/sizeof(*o))
			{
				for (k = 0; k < c; k++)
					o[k] = in[k];
			}
		}
		break;
	case IQM_DOUBLE:
		{	//truncate, sorry...
			const double *in = (const double*)(buffer+va->offset);
			for (j = 0; j < numverts; j++, in+=va->size, o+=sizeof(iqmvert_t)/sizeof(*o))
			{
				for (k = 0; k < c; k++)
					o[k] = in[k];
			}
		}
		break;
	default:
		return;	//oh bum. my laziness strikes again.
	}
}

static void IQM_LoadVertexes_Index(byte *o, size_t c, size_t numverts, const byte *buffer, const struct iqmvertexarray *va)
{
	size_t j, k;
	if (c != va->size)
		return;	//erk, too lazy to handle weirdness.
	switch(va->format)
	{
//	case IQM_BYTE:
	case IQM_UBYTE:
		{
			const byte *in = (const byte*)(buffer+va->offset);
			for (j = 0; j < numverts; j++, in+=va->size, o+=sizeof(iqmvert_t)/sizeof(*o))
			{
				for (k = 0; k < c; k++)
					o[k] = in[k];
			}
		}
		break;
//	case IQM_SHORT:
	case IQM_USHORT:
		{	//truncate...
			const unsigned short *in = (const unsigned short*)(buffer+va->offset);
			for (j = 0; j < numverts; j++, in+=va->size, o+=sizeof(iqmvert_t)/sizeof(*o))
			{
				for (k = 0; k < c; k++)
					o[k] = in[k];
			}
		}
		break;
//	case IQM_INT:
	case IQM_UINT:
		{	//truncate... noesis likes writing these.
			const unsigned int *in = (const unsigned int*)(buffer+va->offset);
			for (j = 0; j < numverts; j++, in+=va->size, o+=sizeof(iqmvert_t)/sizeof(*o))
			{
				for (k = 0; k < c; k++)
					o[k] = in[k];
			}
		}
		break;
//	case IQM_HALF:
//	case IQM_FLOAT:
//	case IQM_DOUBLE:
	default:
		return;	//oh bum. my laziness strikes again.
	}
}

static void GenMatrixPosQuat4Scale(const vec3_t pos, const vec4_t quat, const vec3_t scale, float result[12])
{
	float xx, xy, xz, xw, yy, yz, yw, zz, zw;
	float x2, y2, z2;
	float s;
	x2 = quat[0] + quat[0];
	y2 = quat[1] + quat[1];
	z2 = quat[2] + quat[2];

	xx = quat[0] * x2;   xy = quat[0] * y2;   xz = quat[0] * z2;
	yy = quat[1] * y2;   yz = quat[1] * z2;   zz = quat[2] * z2;
	xw = quat[3] * x2;   yw = quat[3] * y2;   zw = quat[3] * z2;

	s = scale[0];
	result[0*4+0] = s*(1.0f - (yy + zz));
	result[1*4+0] = s*(xy + zw);
	result[2*4+0] = s*(xz - yw);

	s = scale[1];
	result[0*4+1] = s*(xy - zw);
	result[1*4+1] = s*(1.0f - (xx + zz));
	result[2*4+1] = s*(yz + xw);

	s = scale[2];
	result[0*4+2] = s*(xz + yw);
	result[1*4+2] = s*(yz - xw);
	result[2*4+2] = s*(1.0f - (xx + yy));

	result[0*4+3]  =     pos[0];
	result[1*4+3]  =     pos[1];
	result[2*4+3]  =     pos[2];
}
static void Matrix3x4_Invert_Simple (const float *in1, float *out)
{
	// we only support uniform scaling, so assume the first row is enough
	// (note the lack of sqrt here, because we're trying to undo the scaling,
	// this means multiplying by the inverse scale twice - squaring it, which
	// makes the sqrt a waste of time)
#if 1
	double scale = 1.0 / (in1[0] * in1[0] + in1[1] * in1[1] + in1[2] * in1[2]);
#else
	double scale = 3.0 / sqrt
		 (in1->m[0][0] * in1->m[0][0] + in1->m[0][1] * in1->m[0][1] + in1->m[0][2] * in1->m[0][2]
		+ in1->m[1][0] * in1->m[1][0] + in1->m[1][1] * in1->m[1][1] + in1->m[1][2] * in1->m[1][2]
		+ in1->m[2][0] * in1->m[2][0] + in1->m[2][1] * in1->m[2][1] + in1->m[2][2] * in1->m[2][2]);
	scale *= scale;
#endif

	// invert the rotation by transposing and multiplying by the squared
	// recipricol of the input matrix scale as described above
	out[0] = in1[0] * scale;
	out[1] = in1[4] * scale;
	out[2] = in1[8] * scale;
	out[4] = in1[1] * scale;
	out[5] = in1[5] * scale;
	out[6] = in1[9] * scale;
	out[8] = in1[2] * scale;
	out[9] = in1[6] * scale;
	out[10] = in1[10] * scale;

	// invert the translate
	out[3] = -(in1[3] * out[0] + in1[7] * out[1] + in1[11] * out[2]);
	out[7] = -(in1[3] * out[4] + in1[7] * out[5] + in1[11] * out[6]);
	out[11] = -(in1[3] * out[8] + in1[7] * out[9] + in1[11] * out[10]);
}

void Mod_LoadIQMModel (qmodel_t *mod, const void *buffer)
{
	const struct iqmheader	*pinheader;
	const char				*pintext;
	const struct iqmmesh	*pinsurface;
	const struct iqmanim	*pinframes;
	const unsigned int		*pintriangle;
	unsigned short			*poutindexes;
	iqmvert_t				*poutvert;
	int						size;
	int						start, end, total;
	int						ival, j, a;
	int						numsurfs, surf;
	aliashdr_t				*outhdr;
	int						numverts, firstidx, firstvert;
	int						numanims;

	bonepose_t				*outposes;
	boneinfo_t				*outbones;
	int						numposes, numjoints;

	start = Hunk_LowMark ();

	pinheader = (const struct iqmheader *)buffer;


	if (strcmp(pinheader->magic, IQM_MAGIC))
		Sys_Error ("%s has invalid magic for iqm file", mod->name);
	if (LittleLong(pinheader->version) != IQM_VERSION)	//v1 is outdated.
		Sys_Error ("%s is an unsupported version, %i must be %i", mod->name, LittleLong(pinheader->version), IQM_VERSION);

	pintext = (const char*)buffer + LittleLong(pinheader->ofs_text);

	numsurfs = LittleLong (pinheader->num_meshes);
	if (!numsurfs)
		Sys_Error ("%s has no surfaces (animation-only iqms are not supported)", mod->name);
	if (pinheader->num_vertexes > 0xffff)	//indexes is an unsigned short.
		Sys_Error ("%s has too many verts (%u>%u)", mod->name, pinheader->num_vertexes, 0xffffu);

	numanims = LittleLong (pinheader->num_anims);
	size	= sizeof(aliashdr_t) + q_max(1,numanims-1) * sizeof (outhdr->frames[0]);
	outhdr = (aliashdr_t *) Hunk_AllocName (size * numsurfs, loadname);

	numverts = LittleLong(pinheader->num_vertexes);
	poutvert = (iqmvert_t *) Hunk_Alloc (sizeof (*poutvert) * numverts);
	for (j = 0; j < numverts; j++)	//initialise verts, just in case.
		poutvert[j].rgba[0] = poutvert[j].rgba[1] = poutvert[j].rgba[2] = poutvert[j].rgba[3] = poutvert[j].weight[0] = 1;
	for (a = 0; a < LittleLong(pinheader->num_vertexarrays); a++)
	{
		const struct iqmvertexarray *va = (const struct iqmvertexarray*)((const byte*)buffer+LittleLong(pinheader->ofs_vertexarrays)) + a;
		switch(va->type)
		{
		case IQM_POSITION:		IQM_LoadVertexes_Float(poutvert->xyz,	3, numverts, buffer, va); break;
		case IQM_TEXCOORD:		IQM_LoadVertexes_Float(poutvert->st,	2, numverts, buffer, va); break;
		case IQM_NORMAL:		IQM_LoadVertexes_Float(poutvert->norm,	3, numverts, buffer, va); break;
		//case IQM_TANGENT:		IQM_LoadVertexes_Float(poutvert->tang,	4, numverts, buffer, va); break; //bitangent must be calced using a crossproduct and the fourth component (for direction). we don't need this (unless you want rtlights or bumpmaps)
		case IQM_COLOR:			IQM_LoadVertexes_Float(poutvert->rgba,	4, numverts, buffer, va); break;
		case IQM_BLENDINDEXES:	IQM_LoadVertexes_Index(poutvert->idx,	4, numverts, buffer, va); break;
		case IQM_BLENDWEIGHTS:	IQM_LoadVertexes_Float(poutvert->weight,4, numverts, buffer, va); break;
		default:
			continue; //no idea what it is. probably custom
		}
	}

	numposes = LittleLong (pinheader->num_frames);
	numjoints = LittleLong(pinheader->num_poses);
	if (pinheader->num_poses == pinheader->num_joints)
	{
		const unsigned short	*pinframedata = (const unsigned short*)((const byte*)buffer + pinheader->ofs_frames);
		const struct iqmpose	*pinajoint = (const struct iqmpose*)((const byte*)buffer + pinheader->ofs_poses), *p;
		vec3_t pos, scale;
		vec4_t quat;
		outposes = Hunk_Alloc(sizeof(*outposes)*numposes*numjoints);
		for (a = 0; a < numposes; a++)
		{
			for (j = 0, p = pinajoint; j < numjoints; j++, p++)
			{
				unsigned int mask = LittleLong(p->mask);
				pos[0]   = LittleFloat(p->channeloffset[0]); if (mask &   1) pos[0]   += (unsigned short)LittleShort(*pinframedata++) * LittleFloat(p->channelscale[0]);
				pos[1]   = LittleFloat(p->channeloffset[1]); if (mask &   2) pos[1]   += (unsigned short)LittleShort(*pinframedata++) * LittleFloat(p->channelscale[1]);
				pos[2]   = LittleFloat(p->channeloffset[2]); if (mask &   4) pos[2]   += (unsigned short)LittleShort(*pinframedata++) * LittleFloat(p->channelscale[2]);
				quat[0]  = LittleFloat(p->channeloffset[3]); if (mask &   8) quat[0]  += (unsigned short)LittleShort(*pinframedata++) * LittleFloat(p->channelscale[3]);
				quat[1]  = LittleFloat(p->channeloffset[4]); if (mask &  16) quat[1]  += (unsigned short)LittleShort(*pinframedata++) * LittleFloat(p->channelscale[4]);
				quat[2]  = LittleFloat(p->channeloffset[5]); if (mask &  32) quat[2]  += (unsigned short)LittleShort(*pinframedata++) * LittleFloat(p->channelscale[5]);
				quat[3]  = LittleFloat(p->channeloffset[6]); if (mask &  64) quat[3]  += (unsigned short)LittleShort(*pinframedata++) * LittleFloat(p->channelscale[6]);
				scale[0] = LittleFloat(p->channeloffset[7]); if (mask & 128) scale[0] += (unsigned short)LittleShort(*pinframedata++) * LittleFloat(p->channelscale[7]);
				scale[1] = LittleFloat(p->channeloffset[8]); if (mask & 256) scale[1] += (unsigned short)LittleShort(*pinframedata++) * LittleFloat(p->channelscale[8]);
				scale[2] = LittleFloat(p->channeloffset[9]); if (mask & 512) scale[2] += (unsigned short)LittleShort(*pinframedata++) * LittleFloat(p->channelscale[9]);

				//fixme: should probably save the 10 values above and slerp, but its simpler to just save+lerp a matrix (although this does result in denormalisation when interpolating).
				GenMatrixPosQuat4Scale(pos, quat, scale, outposes[(a*numjoints+j)].mat);
			}
		}

	}
	else
	{	//panic! panic! something weird is going on!
		numposes = 0;
		numjoints = 0;
		outposes = NULL;
	}

	{
		const struct iqmjoint	*pinbjoint = (const struct iqmjoint*)((const byte*)buffer + pinheader->ofs_joints);
		bonepose_t basepose[256], rel;
		vec3_t pos, scale;
		vec4_t quat;
		outbones = Hunk_Alloc(sizeof(*outbones)*numjoints);
		for (j = 0; j < numjoints; j++)
		{
			outbones[j].parent = LittleLong(pinbjoint[j].parent);
			q_strlcpy(outbones[j].name, pintext+LittleLong(pinbjoint[j].name), sizeof(outbones[j].name));

			pos[0]   = LittleFloat(pinbjoint[j].translate[0]);
			pos[1]   = LittleFloat(pinbjoint[j].translate[1]);
			pos[2]   = LittleFloat(pinbjoint[j].translate[2]);
			quat[0]  = LittleFloat(pinbjoint[j].rotate[0]);
			quat[1]  = LittleFloat(pinbjoint[j].rotate[1]);
			quat[2]  = LittleFloat(pinbjoint[j].rotate[2]);
			quat[3]  = LittleFloat(pinbjoint[j].rotate[3]);
			scale[0] = LittleFloat(pinbjoint[j].scale[0]);
			scale[1] = LittleFloat(pinbjoint[j].scale[1]);
			scale[2] = LittleFloat(pinbjoint[j].scale[2]);
			GenMatrixPosQuat4Scale(pos, quat, scale, rel.mat);
			//urgh, these are relative.
			if (outbones[j].parent < 0)
				memcpy(basepose[j].mat, rel.mat, sizeof(rel.mat));
			else
				R_ConcatTransforms((void*)basepose[outbones[j].parent].mat, (void*)rel.mat, (void*)basepose[j].mat);

			Matrix3x4_Invert_Simple(basepose[j].mat, outbones[j].inverse.mat);
			//and now we have the inversion matrix to use to undo the bone positions baked into the vertex data.
		}
	}

	mod->numframes = q_max(1,numanims);

	for (surf = 0, pinsurface = (const struct iqmmesh*)((const byte*)buffer + LittleLong(pinheader->ofs_meshes)); surf < numsurfs; surf++, pinsurface++)
	{
		aliashdr_t	*osurf = (aliashdr_t*)((byte*)outhdr + size*surf);

		if (surf+1 < numsurfs)
			osurf->nextsurface = size;
		else
			osurf->nextsurface = 0;

		osurf->poseverttype = PV_IQM;
		osurf->numverts_vbo = osurf->numverts = LittleLong(pinsurface->num_vertexes);

		firstvert = LittleLong(pinsurface->first_vertex);
		osurf->vertexes = (intptr_t)(poutvert + firstvert) - (intptr_t)osurf;
		osurf->numverts = LittleLong(pinsurface->num_vertexes);
		osurf->nummorphposes = 1;	//as a skeletal model, we do all our animations via bones rather than vertex morphs.

		osurf->numtris = LittleLong(pinsurface->num_triangles);
		osurf->numindexes = osurf->numtris*3;
		poutindexes = (unsigned short *) Hunk_Alloc (sizeof (*poutindexes) * osurf->numindexes);
		osurf->indexes = (intptr_t)poutindexes - (intptr_t)osurf;
		pintriangle = (const unsigned int*)((const byte*)buffer + LittleLong(pinheader->ofs_triangles));
		firstidx = LittleLong(pinsurface->first_triangle)*3;
		pintriangle += firstidx;
		for (j = 0; j < osurf->numindexes; j++)
			poutindexes[j] = pintriangle[j] - firstvert;

		pinframes = (const struct iqmanim*)((const byte*)buffer + pinheader->ofs_anims);
		for (a = 0; a < numanims; a++, pinframes++)
		{
			osurf->frames[a].firstpose = LittleLong(pinframes->first_frame);
			osurf->frames[a].numposes = LittleLong(pinframes->num_frames);
			osurf->frames[a].interval = LittleFloat(pinframes->framerate);
			if (!osurf->frames[a].interval)
				osurf->frames[a].interval = 20;
			osurf->frames[a].interval = 1.0/osurf->frames[a].interval;
			if (LittleLong(pinframes->flags) & IQM_LOOP)
				/*FIXME*/;

			q_strlcpy(osurf->frames[a].name, pintext+LittleLong(pinframes->name), sizeof(osurf->frames[ival].name));
			for (j = 0; j < 3; j++)
			{	//fixme...
				osurf->frames[a].bboxmin.v[j] = 0;
				osurf->frames[a].bboxmax.v[j] = 255;
			}
		}
		for (; a < 1; a++, pinframes++)
		{	//unanimated models need to pick their morphpose without warnings.
			osurf->frames[a].firstpose = 0;
			osurf->frames[a].numposes = 1;
			osurf->frames[a].interval = 0.1;

			q_strlcpy(osurf->frames[a].name, "", sizeof(osurf->frames[ival].name));
			for (j = 0; j < 3; j++)
			{	//fixme...
				osurf->frames[a].bboxmin.v[j] = 0;
				osurf->frames[a].bboxmax.v[j] = 255;
			}
		}
		osurf->numframes = a;
		if (numposes)
		{
			osurf->numboneposes = numposes;
			osurf->boneposedata = (intptr_t)outposes - (intptr_t)osurf;
		}
		osurf->numbones = numjoints;
		osurf->boneinfo = (intptr_t)outbones - (intptr_t)osurf;

		for (j = 0; j < 3; j++)
		{
			osurf->scale_origin[j] = 0;
			osurf->scale[j] = 1.0;
		}

		//skin size is irrelevant
		osurf->skinwidth = 1;
		osurf->skinheight = 1;

		//load the textures
		if (!isDedicated)
		{
			const char *pinshader = pintext + LittleLong(pinsurface->material);
			osurf->numskins = 1;
			for (j = 0; j < 1; j++, pinshader++)
			{
				char texturename[MAX_QPATH];
				char fullbrightname[MAX_QPATH];
				char *ext;
				//texture names in md3s are kinda fucked. they could be just names relative to the mdl, or full paths, or just simple shader names.
				//our texture manager is too lame to scan all 1000 possibilities
				if (strchr(pinshader, '/') || strchr(pinshader, '\\'))
				{	//so if there's a path then we want to use that.
					q_strlcpy(texturename, pinshader, sizeof(texturename));
				}
				else
				{	//and if there's no path then we want to prefix it with our own.
					q_strlcpy(texturename, mod->name, sizeof(texturename));
					*(char*)COM_SkipPath(texturename) = 0;
					//and concat the specified name
					q_strlcat(texturename, pinshader, sizeof(texturename));
				}
				//and make sure there's no extensions. these get ignored in q3, which is kinda annoying, but this is an md3 and standards are standards (and it makes luma easier).
				ext = (char*)COM_FileGetExtension(texturename);
				if (*ext)
					*--ext = 0;
				//luma has an extra postfix.
				q_snprintf(fullbrightname, sizeof(fullbrightname), "%s_luma", texturename);
				osurf->gltextures[j][0] = TexMgr_LoadImage(mod, texturename, osurf->skinwidth, osurf->skinheight, SRC_EXTERNAL, NULL, texturename, 0, TEXPREF_PAD|TEXPREF_ALPHA|TEXPREF_NOBRIGHT|TEXPREF_MIPMAP);
				osurf->fbtextures[j][0] = NULL;//TexMgr_LoadImage(mod, fullbrightname, osurf->skinwidth, osurf->skinheight, SRC_EXTERNAL, NULL, fullbrightname, 0, TEXPREF_PAD|TEXPREF_ALPHA|TEXPREF_FULLBRIGHT|TEXPREF_MIPMAP);
				osurf->gltextures[j][3] = osurf->gltextures[j][2] = osurf->gltextures[j][1] = osurf->gltextures[j][0];
				osurf->fbtextures[j][3] = osurf->fbtextures[j][2] = osurf->fbtextures[j][1] = osurf->fbtextures[j][0];
			}
			if (osurf->numskins)
			{
				osurf->skinwidth = osurf->gltextures[0][0]->source_width;
				osurf->skinheight = osurf->gltextures[0][0]->source_height;
			}
		}
	}
	GLMesh_LoadVertexBuffer (mod, outhdr);

	//small violation of the spec, but it seems like noone else uses it.
	mod->flags = LittleLong (pinheader->flags);


	mod->synctype = ST_FRAMETIME;	//keep IQM animations synced to when .frame is changed. framegroups are otherwise not very useful.
	mod->type = mod_alias;

	Mod_CalcAliasBounds (outhdr); //johnfitz

//
// move the complete, relocatable alias model to the cache
//
	end = Hunk_LowMark ();
	total = end - start;

	Cache_Alloc (&mod->cache, total, loadname);
	if (!mod->cache.data)
		return;
	memcpy (mod->cache.data, outhdr, total);

	Hunk_FreeToLowMark (start);
}