/*
Copyright (C) 1996-1997 Id Software, Inc.

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_rmain.c

#include "quakedef.h"

entity_t	r_worldentity;
qboolean	r_cache_thrash;		// compatibility
qboolean	r_fullbright_draw;
qboolean	r_noshadow_draw;

vec3_t		modelorg, r_entorigin;

entity_t	*currententity;

int			r_visframecount;	// bumped when going to a new PVS
int			r_framecount;		// used for dlight push checking

mplane_t	frustum[4];

int			c_brush_polys, c_alias_polys;

int			particletexture;	// little dot for particles
int			skyboxtextures;		// by joe
int			underwatertexture;
int			detailtexture;
int			chrometexture;
int			glasstexture;

int			playertextures;
int			playerfbtextures;

float		frametime;

float		slowpulse = 0;
float		fastpulse = 0;
float		killpulse = 0;

int			slowpulsedir = 1;
int			fastpulsedir = 1;
int			killpulsedir = 1;

float		slowcycle = 0;
float		fastcycle = 0;
float		killcycle = 0;

#define INTERP_WEAP_MAXNUM		24
#define INTERP_WEAP_MINDIST		5000
#define INTERP_WEAP_MAXDIST		95000

typedef struct interpolated_weapon
{
	char	name[MAX_QPATH];
	int		maxDistance;
} interp_weapon_t;

static	interp_weapon_t	interpolated_weapons[INTERP_WEAP_MAXNUM];
static	int				interp_weap_num = 0;

// view origin
vec3_t	vup;
vec3_t	vpn;
vec3_t	vright;
vec3_t	r_origin;

float	r_world_matrix[16];

// screen size info
refdef_t	r_refdef;

mleaf_t		*r_viewleaf, *r_oldviewleaf;
mleaf_t		*r_viewleaf2, *r_oldviewleaf2;	// for watervis hack

texture_t	*r_notexture_mip;

int			d_lightstylevalue[256];			// 8.8 fraction of base light value
int			lightmode = 2;

cvar_t	r_drawentities = {"r_drawentities", "1"};
cvar_t	r_drawviewmodel = {"r_drawviewmodel", "1"};
cvar_t	r_viewmodelsize = {"r_viewmodelsize", "1"};
cvar_t	r_speeds = {"r_speeds", "0"};
cvar_t	r_fullbright = {"r_fullbright", "0"};
cvar_t	r_lightmap = {"r_lightmap", "0"};
cvar_t	r_shadows = {"r_shadows", "0"};
cvar_t	r_wateralpha = {"r_wateralpha", "0.6", true};
cvar_t	r_liquidshade = {"r_liquidshade", "1", true};
cvar_t	r_dynamic = {"r_dynamic", "1"};
cvar_t	r_novis = {"r_novis", "0", true};
cvar_t	r_fullbrightskins = {"r_fullbrightskins", "0"};
cvar_t	r_fastsky = {"r_fastsky", "0"};
cvar_t	r_skycolor = {"r_skycolor", "4"};
cvar_t	r_farclip = {"r_farclip", "4096"};
cvar_t  r_waterripple = {"r_waterripple", "0", true};
cvar_t	r_skybox = {"r_skybox", "", false, false, OnChange_r_skybox};

// fenix@io.com: model interpolation
cvar_t  gl_interpolate_animation = {"gl_interpolate_animation", "1"};
cvar_t  gl_interpolate_transform = {"gl_interpolate_transform", "1"};

cvar_t	gl_clear = {"gl_clear", "0"};
cvar_t	gl_cull = {"gl_cull", "0"};
cvar_t	gl_ztrick = {"gl_ztrick", "0"};
cvar_t	gl_smoothmodels = {"gl_smoothmodels", "1"};
cvar_t	gl_affinemodels = {"gl_affinemodels", "0"};
cvar_t	gl_subdivide_size = {"gl_subdivide_size", "128", true};
cvar_t	gl_polyblend = {"gl_polyblend", "1"};
cvar_t	gl_flashblend = {"gl_flashblend", "0"};
cvar_t	gl_playermip = {"gl_playermip", "0"};
cvar_t	gl_nocolors = {"gl_nocolors", "0"};
cvar_t	gl_finish = {"gl_finish", "0"};
cvar_t	gl_loadlitfiles = {"gl_loadlitfiles", "1"};
cvar_t  gl_lerpimages = {"gl_lerpimages", "1"};
cvar_t	gl_doubleeyes = {"gl_doubleeyes", "1"};
cvar_t	gl_interdist = {"gl_interpolate_distance", "17000"};
cvar_t  gl_waterfog = {"gl_waterfog", "1"};
cvar_t  gl_waterfog_density = {"gl_waterfog_density", "1"};
cvar_t	gl_detail = {"gl_detail", "0", true};
cvar_t	gl_caustics = {"gl_caustics", "1", true};
cvar_t	gl_shiny = {"gl_shiny", "0", true};
cvar_t	gl_ringalpha = {"gl_ringalpha", "0.4", true};
cvar_t	gl_fb_bmodels = {"gl_fb_bmodels", "1"};
cvar_t	gl_fb_models = {"gl_fb_models", "1"};
cvar_t  gl_vertexlights = {"gl_vertexlights", "1"};
cvar_t	gl_coronas = {"gl_coronas", "1", true};
cvar_t	gl_triplebuffer = {"gl_triplebuffer", "1", true};

cvar_t	gl_part_explosions = {"gl_part_explosions", "1", true};
cvar_t	gl_part_trails = {"gl_part_trails", "1", true};
cvar_t	gl_part_spikes = {"gl_part_spikes", "1", true};
cvar_t	gl_part_gunshots = {"gl_part_gunshots", "1", true};
cvar_t	gl_part_blood = {"gl_part_blood", "1", true};
cvar_t	gl_part_telesplash = {"gl_part_telesplash", "1", true};
cvar_t	gl_part_blobs = {"gl_part_blobs", "1", true};
cvar_t	gl_part_lavasplash = {"gl_part_lavasplash", "1", true};
cvar_t	gl_part_inferno = {"gl_part_inferno", "1", true};
cvar_t	gl_part_flames = {"gl_part_flames", "1", true};
cvar_t	gl_part_lightning = {"gl_part_lightning", "1", true};

cvar_t  gl_fogenable = {"gl_fogenable", "0", true};
cvar_t  gl_fogstart = {"gl_fogstart", "50.0", true}; 
cvar_t  gl_fogend = {"gl_fogend", "1500.0", true}; 
cvar_t  gl_fogred = {"gl_fogred","0.4", true};
cvar_t  gl_fogblue = {"gl_fogblue","0.4", true};
cvar_t  gl_foggreen = {"gl_foggreen","0.4", true};
cvar_t  gl_fogdensity = {"gl_fogdensity", "0.8", true};
cvar_t  gl_fogalpha = {"gl_fogalpha", "0.5", true};

/*
=============
R_CullBox

Returns true if the box is completely outside the frustum
=============
*/
qboolean R_CullBox (vec3_t mins, vec3_t maxs) 
{
	int i;

	for (i = 0; i < 4; i++) {
		if (BOX_ON_PLANE_SIDE (mins, maxs, &frustum[i]) == 2) {
			return true;
		}
	}
	return false;
}

/*
=============
R_CullSphere

Returns true if the sphere is completely outside the frustum
=============
*/
qboolean R_CullSphere (vec3_t centre, float radius) 
{
	int i;
	mplane_t *p;

	for (i = 0, p = frustum; i < 4; i++, p++) {
		if (PlaneDiff(centre, p) <= -radius) {
			return true;
		}
	}
	return false;
}

/*
=============
R_RotateForEntity

fenix@io.com: model transform interpolation
=============
*/
void R_RotateForEntity (entity_t *e)
{
	glTranslatef (e->origin[0], e->origin[1], e->origin[2]);

	glRotatef (e->angles[1], 0, 0, 1);
	glRotatef (-e->angles[0], 0, 1, 0);
	glRotatef (e->angles[2], 1, 0, 0);
}


/*
=============
R_BlendedRotateForEntity

fenix@io.com: model transform interpolation
=============
*/
void R_BlendedRotateForEntity (entity_t *e, int shadow)
{
	float	timepassed;
	float	blend;
	vec3_t	d;
	int		i;

	// positional interpolation
	timepassed = cl.time - e->translate_start_time;

	if (e->translate_start_time == 0 || timepassed > 1)
	{
		e->translate_start_time = cl.time;
		VectorCopy (e->origin, e->origin1);
		VectorCopy (e->origin, e->origin2);
	}

	if (!VectorCompare (e->origin, e->origin2))
	{
		e->translate_start_time = cl.time;
		VectorCopy (e->origin2, e->origin1);
		VectorCopy (e->origin,  e->origin2);
		blend = 0;
	}
	else
	{
		blend =  timepassed / 0.1;

		if (cl.paused || blend > 1) blend = 1;
	}

	VectorSubtract (e->origin2, e->origin1, d);

	glTranslatef (e->origin1[0] + (blend * d[0]),
		e->origin1[1] + (blend * d[1]),
		e->origin1[2] + (blend * d[2]));

	// orientation interpolation (Euler angles, yuck!)
	timepassed = cl.time - e->rotate_start_time;

	if (e->rotate_start_time == 0 || timepassed > 1)
	{
		e->rotate_start_time = cl.time;
		VectorCopy (e->angles, e->angles1);
		VectorCopy (e->angles, e->angles2);
	}

	if (!VectorCompare (e->angles, e->angles2))
	{
		e->rotate_start_time = cl.time;
		VectorCopy (e->angles2, e->angles1);
		VectorCopy (e->angles,  e->angles2);
		blend = 0;
	}
	else
	{
		blend = timepassed / 0.1;
 
		if (cl.paused || blend > 1) blend = 1;
	}

	VectorSubtract (e->angles2, e->angles1, d);

	// always interpolate along the shortest path
	for (i = 0; i < 3; i++) 
	{
		if (d[i] > 180) 
			d[i] -= 360;
		else if (d[i] < -180)
			d[i] += 360;
	}

	glRotatef (e->angles1[1] + (blend * d[1]),  0, 0, 1);

	if (!shadow)
	{
		glRotatef (-e->angles1[0] + (-blend * d[0]),  0, 1, 0);
		glRotatef ( e->angles1[2] + ( blend * d[2]),  1, 0, 0);
	}
}

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

				SPRITE MODELS

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

/*
================
R_GetSpriteFrame
================
*/
mspriteframe_t *R_GetSpriteFrame (entity_t *currententity)
{
	msprite_t		*psprite;
	mspritegroup_t	*pspritegroup;
	mspriteframe_t	*pspriteframe;
	int				i, numframes, frame;
	float			*pintervals, fullinterval, targettime, time;

	psprite = currententity->model->cache.data;
	frame = currententity->frame;

	if ((frame >= psprite->numframes) || (frame < 0)) {
		Con_Printf ("R_DrawSprite: no such frame %d\n", frame);
		frame = 0;
	}

	if (psprite->frames[frame].type == SPR_SINGLE) {
		pspriteframe = psprite->frames[frame].frameptr;
	} else {
		pspritegroup = (mspritegroup_t *)psprite->frames[frame].frameptr;
		pintervals = pspritegroup->intervals;
		numframes = pspritegroup->numframes;
		fullinterval = pintervals[numframes-1];

		time = cl.time + currententity->syncbase;

		// when loading in Mod_LoadSpriteGroup, we guaranteed all interval values
		// are positive, so we don't have to worry about division by 0
		targettime = time - ((int)(time / fullinterval)) * fullinterval;

		for (i=0 ; i<(numframes-1) ; i++) {
			if (pintervals[i] > targettime)	break;
		}
		pspriteframe = pspritegroup->frames[i];
	}
	return pspriteframe;
}

/*
=================
R_DrawSpriteModel
=================
*/
void R_DrawSpriteModel (entity_t *e)
{
	vec3_t			point, right, up;
	mspriteframe_t	*frame;
	msprite_t		*psprite;

	// don't even bother culling, because it's just a single
	// polygon without a surface cache
	psprite = currententity->model->cache.data;
	frame = R_GetSpriteFrame (e);

	// standard quake sprites are handled differently. other types use the normal sprite code
	if (psprite->drawType == SPR_LIGHT) {
		// add a glow for this
		R_AddGlowEffect (0.89, 0.59, 0.31, 15, e->origin);
		return;
	} else if (psprite->drawType == SPR_BUBBLE) {
		// add a glow for this
		R_AddGlowEffect (0.5, 0.75, 1.0, 5, e->origin);
		return;
	} else if (psprite->drawType == SPR_RAIN) {
		// add a glow for this "very faint"
		R_SpriteRain (e->origin);
		R_AddGlowEffect (0.5, 0.75, 1.0, 1, e->origin);
		return;
	} else if (psprite->drawType != SPR_DRAW) {
		// handles sprites that have not been given a drawing routine yet
		return;
	}

	if (psprite->type == SPR_ORIENTED) {
		// bullet marks on walls
		AngleVectors (currententity->angles, NULL, right, up);
	} else if (psprite->type == SPR_FACING_UPRIGHT) {
		VectorSet (up, 0, 0, 1);
		right[0] = e->origin[1] - r_origin[1];
		right[1] = -(e->origin[0] - r_origin[0]);
		right[2] = 0;
		VectorNormalize (right);
	} else if (psprite->type == SPR_VP_PARALLEL_UPRIGHT) {
		VectorSet (up, 0, 0, 1);
		VectorCopy (vright, right);
	} else {
		// normal sprite
		VectorCopy (vup, up);
		VectorCopy (vright, right);
	}

	GL_Bind (frame->gl_texturenum);

	glBegin (GL_QUADS);

	glTexCoord2f (0, 1);
	VectorMA (e->origin, frame->down, up, point);
	VectorMA (point, frame->left, right, point);
	glVertex3fv (point);

	glTexCoord2f (0, 0);
	VectorMA (e->origin, frame->up, up, point);
	VectorMA (point, frame->left, right, point);
	glVertex3fv (point);

	glTexCoord2f (1, 0);
	VectorMA (e->origin, frame->up, up, point);
	VectorMA (point, frame->right, right, point);
	glVertex3fv (point);

	glTexCoord2f (1, 1);
	VectorMA (e->origin, frame->down, up, point);
	VectorMA (point, frame->right, right, point);
	glVertex3fv (point);
	
	glEnd ();
}

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

				ALIAS MODELS

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

// precalculated dot products for quantized angles
#define SHADEDOT_QUANT 16
float	r_avertexnormal_dots[SHADEDOT_QUANT][256] =
#include "anorm_dots.h"
;

// light lerping
vec3_t	shadevector;
vec3_t	vertexlight;

float	shadelight, ambientlight;
float	apitch, ayaw;
float   lightlerpoffset;

float *shadedots = r_avertexnormal_dots[0];
float *shadedots2 = r_avertexnormal_dots[0];

// fenix@io.com: model animation interpolation
int	lastposenum0;
int	lastposenum;

/*
=============
Calc_LightLerp

Calculates lightning between two angles
=============
*/
float Calc_LightLerp (float l1, float l2)
{
	float l, diff;

	if (l1 != l2) {
		if (l1 > l2) {
			diff = (l1 - l2) * -1;
		} else {
			diff = l2 - l1;
		}
		diff *= lightlerpoffset;
		l = l1 + diff;
	} else {
		l = l1;
	}
	// add contrast - this is a nasty hack from Pox's tut which simulates specular lighting
	// mainly introduced cos at the time he didn't know the norms.  however, my engine does
	// calculate the norms at model load time (although it doesn't really use them) so i
	// should be able to do proper specular lighting... if only i knew how :-(
	l *= l;

	return l;
}

/*
=============
GL_DrawAliasFrame
=============
*/
void GL_DrawAliasFrame (aliashdr_t *paliashdr, int posenum, qboolean mtex)
{
	float		l, alpha;
	trivertx_t	*verts;
	int			i, *order, count;
	float		l1, l2;
	vec3_t		l_v;

	alpha = (currententity == &cl.viewent && gl_mtexable) ? ((cl.items & IT_INVISIBILITY) ? gl_ringalpha.value : bound(0, r_drawviewmodel.value, 1)) : model_alpha;

	lastposenum = posenum;

	verts = (trivertx_t *)((byte *)paliashdr + paliashdr->posedata);
	verts += posenum * paliashdr->poseverts;
	order = (int *)((byte *)paliashdr + paliashdr->commands);

	if (alpha < 1.0) {
		glEnable (GL_BLEND);
	}

	while ((count = *order++)) {
		// get the vertex count and primitive type
		if (count < 0) {
			count = -count;
			glBegin (GL_TRIANGLE_FAN);
		} else {
			glBegin (GL_TRIANGLE_STRIP);
		} do {
			// texture coordinates come from the draw list
			if (mtex) {
				qglMultiTexCoord2f (GL_TEXTURE0_ARB, ((float *)order)[0], ((float *)order)[1]);
				qglMultiTexCoord2f (GL_TEXTURE1_ARB, ((float *)order)[0], ((float *)order)[1]);
			} else {
				glTexCoord2f (((float *)order)[0], ((float *)order)[1]);
			}
			order += 2;

			if (gl_vertexlights.value && !r_fullbright_draw) {
				l = R_VertexLight (verts->lightnormalindex, apitch, ayaw);
				l = min(1, l);
			} else {
				// normals and vertexes come from the frame list
				l1 = min(1, (shadedots[verts->lightnormalindex] * shadelight + ambientlight) / 256);
				l2 = min(1, (shadedots2[verts->lightnormalindex] * shadelight + ambientlight) / 256);

				l = Calc_LightLerp (l1, l2);
			}

			if (!r_fullbright_draw) {
				for (i=0 ; i<3 ; i++) {
					l_v[i] = lightcolor[i] / 256 + l;
				}
				glColor4f (l_v[0], l_v[1], l_v[2], alpha);
			} else {
				glColor4f (l, l, l, alpha);
			}
			glVertex3f (verts->v[0], verts->v[1], verts->v[2]);
			verts++;
		} while (--count);

		glEnd ();
	}

	if (alpha < 1.0) {
		glDisable (GL_BLEND);
	}
}

/*
=============
GL_DrawAliasBlendedFrame

fenix@io.com: model animation interpolation
=============
*/
void GL_DrawAliasBlendedFrame (aliashdr_t *paliashdr, int pose1, int pose2, float blend, int distance, qboolean mtex)
{
	float		l, alpha;
	float		d2, l1, l2;
	trivertx_t	*verts1, *verts2;
	int			i, *order, count, maxDistance;
	vec3_t		d, l_v;

	alpha = (currententity == &cl.viewent && gl_mtexable) ? ((cl.items & IT_INVISIBILITY) ? gl_ringalpha.value : bound(0, r_drawviewmodel.value, 1)) : model_alpha;

	maxDistance = bound(INTERP_WEAP_MINDIST, distance, INTERP_WEAP_MAXDIST);

	lastposenum0 = pose1;
	lastposenum = pose2;

	verts1 = (trivertx_t *)((byte *)paliashdr + paliashdr->posedata);
	verts2 = verts1;

	verts1 += pose1 * paliashdr->poseverts;
	verts2 += pose2 * paliashdr->poseverts;

	order = (int *)((byte *)paliashdr + paliashdr->commands);

	if (alpha < 1.0) {
		glEnable (GL_BLEND);
	}

	while ((count = *order++)) {
		// get the vertex count and primitive type
		if (count < 0) {
			count = -count;
			glBegin (GL_TRIANGLE_FAN);
		} else {
			glBegin (GL_TRIANGLE_STRIP);
		} do {
			// texture coordinates come from the draw list
			if (mtex) {
				qglMultiTexCoord2f (GL_TEXTURE0_ARB, ((float *)order)[0], ((float *)order)[1]);
				qglMultiTexCoord2f (GL_TEXTURE1_ARB, ((float *)order)[0], ((float *)order)[1]);
			} else {
				glTexCoord2f (((float *)order)[0], ((float *)order)[1]);
			}
			order += 2;

			// normals and vertexes come from the frame list
			// blend the light intensity from the two frames together
			if (gl_vertexlights.value && !r_fullbright_draw) {
				l = R_LerpVertexLight (verts1->lightnormalindex, verts2->lightnormalindex, blend, apitch, ayaw);
				l = min(1, l);
			} else {
				// normals and vertexes come from the frame list
				// blend the light intensity from the two frames together
				d[0] = (shadedots[verts2->lightnormalindex] * shadelight + ambientlight) - (shadedots[verts1->lightnormalindex] * shadelight + ambientlight);
				d2 = (shadedots2[verts2->lightnormalindex] * shadelight + ambientlight) - (shadedots2[verts1->lightnormalindex] * shadelight + ambientlight);			

				l1 = min(1, (shadedots[verts1->lightnormalindex] * shadelight + ambientlight) + (blend * d[0]) / 256);
				l2 = min(1, (shadedots2[verts1->lightnormalindex] * shadelight + ambientlight) + (blend * d2) / 256);

				l = Calc_LightLerp(l1, l2);
			}

			if (!r_fullbright_draw) {
				for (i=0 ; i<3 ; i++) {
					l_v[i] = lightcolor[i] / 256 + l;
				}
				glColor4f (l_v[0], l_v[1], l_v[2], alpha);
			} else {
				glColor4f (l, l, l, alpha);
			}
			VectorSubtract (verts2->v, verts1->v, d);

			// blend the vertex positions from each frame together
			if (currententity == &cl.viewent) {
				if (d[0]*d[0] + d[1]*d[1] + d[2]*d[2] < maxDistance) {
					glVertex3f (verts1->v[0] + (blend * d[0]), verts1->v[1] + (blend * d[1]), verts1->v[2] + (blend * d[2]));
				} else {
					glVertex3f (verts2->v[0], verts2->v[1], verts2->v[2]);
				}
			} else {
				glVertex3f (verts1->v[0] + (blend * d[0]), verts1->v[1] + (blend * d[1]), verts1->v[2] + (blend * d[2]));
			}

			verts1++;
			verts2++;
		} while (--count);

		glEnd ();
	}

	if (alpha < 1.0) {
		glDisable (GL_BLEND);
	}
}

/*
=============
GL_DrawAliasShadow
=============
*/
void GL_DrawAliasShadow (aliashdr_t *paliashdr, int posenum)
{
	trivertx_t	*verts;
	trace_t     downtrace;
	int			*order, count;
	vec3_t		point;
	vec3_t      downmove;
	float       s1, c1;
	float		height, lheight;

	lheight = currententity->origin[2] - lightspot[2];
	height = 1 - lheight;

	verts = (trivertx_t *)((byte *)paliashdr + paliashdr->posedata);
	verts += posenum * paliashdr->poseverts;
	order = (int *)((byte *)paliashdr + paliashdr->commands);

	VectorCopy (currententity->origin, downmove);
	downmove[2] = downmove[2] - 4096;
	memset (&downtrace, 0, sizeof(downtrace));

	SV_RecursiveHullCheck (cl.worldmodel->hulls, 0, 0, 1, currententity->origin, downmove, &downtrace);

	s1 = sin( currententity->angles[1] / 180*M_PI);
	c1 = cos( currententity->angles[1] / 180*M_PI);

	if (stencildraw == true) {
		glEnable(GL_STENCIL_TEST);
		glStencilFunc(GL_EQUAL, 1, 2);
		glStencilOp(GL_KEEP, GL_KEEP, GL_INCR);
	}

	while ((count = *order++)) {
		// get the vertex count and primitive type
		if (count < 0) {
			count = -count;
			glBegin (GL_TRIANGLE_FAN);
		} else {
			glBegin (GL_TRIANGLE_STRIP);
		} do {
			// texture coordinates come from the draw list
			// (skipped for shadows) glTexCoord2fv ((float *)order);
			order += 2;

			// normals and vertexes come from the frame list
			point[0] = verts->v[0] * paliashdr->scale[0] + paliashdr->scale_origin[0];
			point[1] = verts->v[1] * paliashdr->scale[1] + paliashdr->scale_origin[1];
			point[2] = verts->v[2] * paliashdr->scale[2] + paliashdr->scale_origin[2];

			point[0] -= shadevector[0]*(point[0]);
			point[1] -= shadevector[1]*(point[1]);
			point[2] -= shadevector[2]*(point[2]);

			point[2] = point[2] - (currententity->origin[2] - downtrace.endpos[2]);

			point[2] += ((point[1] * (s1 * downtrace.plane.normal[0])) -
						 (point[0] * (c1 * downtrace.plane.normal[0])) -
						 (point[0] * (s1 * downtrace.plane.normal[1])) -
						 (point[1] * (c1 * downtrace.plane.normal[1]))) +  
						((1.0 - downtrace.plane.normal[2])*20) + 0.2;

			glVertex3fv (point);

			verts++;
		} while (--count);

		glEnd ();
	}	

	if (stencildraw == true) {
		glDisable(GL_STENCIL_TEST);
	}
}

/*
=============
GL_DrawAliasBlendedShadow

fenix@io.com: model animation interpolation
=============
*/
void GL_DrawAliasBlendedShadow (aliashdr_t *paliashdr, int pose1, int pose2, entity_t *e)
{
	trivertx_t	*verts1, *verts2;
	trace_t     downtrace;
	int			*order, count;
	vec3_t		point1, point2, d;
	vec3_t      downmove;
	float        s1, c1;
	float		height, lheight, blend;

	blend = min(1, (cl.time - e->frame_start_time) / e->frame_interval);

	if (cl.paused || blend > 1) blend = 1;

	lheight = e->origin[2] - lightspot[2];
	height  = 1 - lheight;

	verts1 = (trivertx_t *)((byte *)paliashdr + paliashdr->posedata);
	verts2 = verts1;

	verts1 += pose1 * paliashdr->poseverts;
	verts2 += pose2 * paliashdr->poseverts;

	order = (int *)((byte *)paliashdr + paliashdr->commands);

	VectorCopy (currententity->origin, downmove);
	downmove[2] = downmove[2] - 4096;
	memset (&downtrace, 0, sizeof(downtrace));

	SV_RecursiveHullCheck (cl.worldmodel->hulls, 0, 0, 1, currententity->origin, downmove, &downtrace);

	// calculate the all important angles
	s1 = sin( currententity->angles[1]/180*M_PI);
	c1 = cos( currententity->angles[1]/180*M_PI);

	if (stencildraw == true) {
		glEnable(GL_STENCIL_TEST);
		glStencilFunc(GL_EQUAL, 1, 2);
		glStencilOp(GL_KEEP,GL_KEEP,GL_INCR);
	}

	while ((count = *order++)) {
		// get the vertex count and primitive type
		if (count < 0) {
			count = -count;
			glBegin (GL_TRIANGLE_FAN);
		} else {
			glBegin (GL_TRIANGLE_STRIP);
		} do {
			order += 2;

			point1[0] = verts1->v[0] * paliashdr->scale[0] + paliashdr->scale_origin[0];
			point1[1] = verts1->v[1] * paliashdr->scale[1] + paliashdr->scale_origin[1];
			point1[2] = verts1->v[2] * paliashdr->scale[2] + paliashdr->scale_origin[2];

			point1[0] -= shadevector[0]*(point1[2]+lheight);
			point1[1] -= shadevector[1]*(point1[2]+lheight);

			point2[0] = verts2->v[0] * paliashdr->scale[0] + paliashdr->scale_origin[0];
			point2[1] = verts2->v[1] * paliashdr->scale[1] + paliashdr->scale_origin[1];
			point2[2] = verts2->v[2] * paliashdr->scale[2] + paliashdr->scale_origin[2];

			point2[0] -= shadevector[0]*(point2[2]+lheight);
			point2[1] -= shadevector[1]*(point2[2]+lheight);

			VectorSubtract (point2, point1, d);

			point1[0] = point1[0] + (blend * d[0]);
			point1[1] = point1[1] + (blend * d[1]);
			point1[2] = point1[2] + (blend * d[2]);

			point1[2] =  - (currententity->origin[2] - downtrace.endpos[2]) ;

			point1[2] += ((point1[1] * (s1 * downtrace.plane.normal[0])) -
						  (point1[0] * (c1 * downtrace.plane.normal[0])) -
						  (point1[0] * (s1 * downtrace.plane.normal[1])) -
						  (point1[1] * (c1 * downtrace.plane.normal[1]))) + 
						 ((1.0 - downtrace.plane.normal[2])*20) + 0.2 ;

			glVertex3fv (point1);

			verts1++;
			verts2++;
		} while (--count);

		glEnd ();
	} 

	if (stencildraw == true) {
		glDisable(GL_STENCIL_TEST);
	}
}

/*
=================
R_SetupAliasFrame
=================
*/
void R_SetupAliasFrame (int frame, aliashdr_t *paliashdr, qboolean mtex)
{
	int		pose, numposes;
	float	interval;

	if ((frame >= paliashdr->numframes) || (frame < 0)) {
		Con_DPrintf ("R_AliasSetupFrame: no such frame %d\n", frame);
		frame = 0;
	}

	pose = paliashdr->frames[frame].firstpose;
	numposes = paliashdr->frames[frame].numposes;

	if (numposes > 1) {
		interval = paliashdr->frames[frame].interval;
		pose += (int)(cl.time / interval) % numposes;
	}
	GL_DrawAliasFrame (paliashdr, pose, mtex);
}

/*
=================
R_SetupAliasBlendedFrame

fenix@io.com: model animation interpolation
=================
*/
void R_SetupAliasBlendedFrame (int frame, aliashdr_t *paliashdr, entity_t *e, int distance, qboolean mtex)
{
	int			pose, numposes;
	float		blend;

	if ((frame >= paliashdr->numframes) || (frame < 0)) {
		Con_DPrintf ("R_AliasSetupFrame: no such frame %d\n", frame);
		frame = 0;
	}
	pose = paliashdr->frames[frame].firstpose;
	numposes = paliashdr->frames[frame].numposes;

	if (numposes > 1) {
		e->frame_interval = paliashdr->frames[frame].interval;
		pose += (int)(cl.time / e->frame_interval) % numposes;
	} else {
	// One tenth of a second is a good for most Quake animations.
	// If the nextthink is longer then the animation is usually meant to pause
	// (e.g. check out the shambler magic animation in shambler.qc). If its
	// shorter then things will still be smoothed partly, and the jumps will be
	// less noticable because of the shorter time. So, this is probably a good assumption.
		e->frame_interval = 0.1;
	}

	if (e->pose2 != pose) {
		e->frame_start_time = cl.time;
		e->pose1 = e->pose2;
		e->pose2 = pose;
		blend = 0;
	} else {
		blend = (cl.time - e->frame_start_time) / e->frame_interval;
	}
	
	// weird things start happening if blend passes 1
	if (cl.paused || blend > 1) {
		blend = 1;
	}
	GL_DrawAliasBlendedFrame (paliashdr, e->pose1, e->pose2, blend, distance, mtex);
}

/*
=================
R_Interpolated_Weapon_f

joe: from FuhQuake, but this is less configurable
=================
*/
void R_Interpolated_Weapon_f (void)
{
	int		i, k;
	char	str[MAX_QPATH];

	if (cmd_source != src_command) return;

	if (Cmd_Argc() == 2)
	{
		for (i=0 ; i<interp_weap_num ; i++) {
			if (!Q_strcasecmp(Cmd_Argv(1), interpolated_weapons[i].name)) {
				Con_Printf ("%s`s distance is %d\n", Cmd_Argv(1), interpolated_weapons[i].maxDistance);
				return;
			}
		}
		Con_Printf ("%s`s distance is default (%d)\n", Cmd_Argv(1), (int)gl_interdist.value);
		return;
	}

	if (Cmd_Argc() != 3) {
		Con_Printf ("Usage: set_interpolated_weapon <model> <distance>\n");
		return;
	}
	Q_strcpy (str, Cmd_Argv(1));

	for (i=0, k=-1 ; i<interp_weap_num ; i++) {
		if (!Q_strcasecmp(str, interpolated_weapons[i].name)) {
			k = i;
			break;
		}
	}

	if (k == -1) {
		k = interp_weap_num++;
	}
	Q_strcpy (interpolated_weapons[k].name, str);
	interpolated_weapons[k].maxDistance = (int)Q_atof(Cmd_Argv(2));
}

/*
=================
R_DoWeaponInterpolation

joe: from FuhQuake, but this is less configurable
=================
*/
int R_DoWeaponInterpolation (void)
{
	int	i;

	if (currententity != &cl.viewent) return -1;

	for (i=0 ; i<interp_weap_num ; i++) {
		if (!interpolated_weapons[i].name[0])
			return -1;

		if (!Q_strcasecmp(currententity->model->name, va("%s.mdl", interpolated_weapons[i].name)) || 
			!Q_strcasecmp(currententity->model->name, va("progs/%s.mdl", interpolated_weapons[i].name)))
			return interpolated_weapons[i].maxDistance;
	}
	return -1;
}

/*
=================
R_DrawAliasModel
=================
*/
void R_DrawAliasModel (entity_t *e)
{
	vec3_t		dist, dlight_color;
	vec3_t		mins, maxs;
	float		add;
	float		ang_ceil, ang_floor;
	float		radiusmax = 0.0;
	aliashdr_t	*paliashdr;
	model_t		*clmodel = e->model;
	int			i, lnum;
	int			anim, skinnum, distance;
	int			texture, fb_texture;

	if (!gl_notrans.value) { 
		// allways true if not -nehahra
		model_alpha = currententity->transparency;
		if (model_alpha == 0) {
			model_alpha = 1.0;
		}
	} else {
		model_alpha = 1.0;
	}

	VectorAdd (e->origin, clmodel->mins, mins);
	VectorAdd (e->origin, clmodel->maxs, maxs);

	if (e->angles[0] || e->angles[1] || e->angles[2]) {
		if (R_CullSphere(e->origin, clmodel->radius)) {
			return;
		}
	} else if (R_CullBox(mins, maxs)) {
		return;
	}

	VectorCopy (e->origin, r_entorigin);
	VectorSubtract (r_origin, r_entorigin, modelorg);

	if (clmodel->mflags & MOD_BOLT) {
		ambientlight = 210;
		shadelight = 0;
		r_fullbright_draw = true;
		r_noshadow_draw = true;
	} else if (clmodel->mflags & MOD_FLAME) {
		ambientlight = 255;
		shadelight = 0;
		r_fullbright_draw = true;
		r_noshadow_draw = true;
	} else { // normal lighting
		r_fullbright_draw = false;
		r_noshadow_draw = false;
		ambientlight = shadelight = R_LightPoint (e->origin);
		for (lnum = 0 ; lnum < MAX_DLIGHTS ; lnum++) {
			if (cl_dlights[lnum].die < cl.time || !cl_dlights[lnum].radius)	continue;
			VectorSubtract (e->origin, cl_dlights[lnum].origin, dist);
			add = cl_dlights[lnum].radius - VectorLength (dist);
			if (add > 0) {
				if (gl_vertexlights.value) {
					if (!radiusmax || cl_dlights[lnum].radius > radiusmax) {
						radiusmax = cl_dlights[lnum].radius;
						VectorCopy(cl_dlights[lnum].origin, vertexlight);
					}
				}
				VectorCopy(bubblecolor[cl_dlights[lnum].type], dlight_color);
				for (i=0 ; i<3 ; i++) {
					lightcolor[i] = lightcolor[i] + (dlight_color[i] * add) * 2;
					if (lightcolor[i] > 256) {
						switch (i) {
						case 0:
							lightcolor[1] = lightcolor[1] - (1 * lightcolor[1]/3); 
							lightcolor[2] = lightcolor[2] - (1 * lightcolor[2]/3); 
							break;

						case 1:
							lightcolor[0] = lightcolor[0] - (1 * lightcolor[0]/3); 
							lightcolor[2] = lightcolor[2] - (1 * lightcolor[2]/3); 
							break;

						case 2:
							lightcolor[1] = lightcolor[1] - (1 * lightcolor[1]/3); 
							lightcolor[0] = lightcolor[0] - (1 * lightcolor[0]/3); 
							break;
						}
					}
				}
			}
		}

		// calculate pitch and yaw for vertex lighting
		if (gl_vertexlights.value) {
			vec3_t	dist, ang;
			apitch = e->angles[0];
			ayaw = e->angles[1];
			if (!radiusmax) {
				vlight_pitch = 45;
				vlight_yaw = 45;
			} else {
				VectorSubtract(vertexlight, currententity->origin, dist);
				vectoangles(dist, ang);
				vlight_pitch = ang[0];
				vlight_yaw = ang[1];
			}
		}

		// clamp lighting so it doesn't overbright as much
		ambientlight = bound(128, ambientlight, 192);
		if (ambientlight + shadelight > 192) {
			shadelight = 192 - ambientlight;
		}

		// always give the gun some light
		if (e == &cl.viewent && ambientlight < 24) {
			ambientlight = shadelight = 24;
		}

		// never allow players to go totally black
		if (clmodel->mflags & MOD_PLAYER) {
			if (ambientlight < 8) {
				ambientlight = shadelight = 8;
				r_fullbright_draw = false;
				r_noshadow_draw = true;
			}
		}
	}

	if (clmodel->mflags & MOD_PLAYER && r_fullbrightskins.value) {
		ambientlight = shadelight = 128;
		r_fullbright_draw = true;
		r_noshadow_draw = true;
	}

	if (gl_vertexlights.value) {
		shadedots = r_avertexnormal_dots[((int)(e->angles[1] * (SHADEDOT_QUANT / 360.0))) & (SHADEDOT_QUANT - 1)];
	} else {
		// add pitch angle so lighting changes when looking up/down (mainly for viewmodel)
		lightlerpoffset = (e->angles[1]+e->angles[0]) * (SHADEDOT_QUANT / 360.0);

		ang_ceil = ceil(lightlerpoffset);
		ang_floor = floor(lightlerpoffset);

		lightlerpoffset = ang_ceil - lightlerpoffset;

		shadedots = r_avertexnormal_dots[(int)ang_ceil & (SHADEDOT_QUANT - 1)];
		shadedots2 = r_avertexnormal_dots[(int)ang_floor & (SHADEDOT_QUANT - 1)];

		if (currententity->lastShadeLight) {
			shadelight = (shadelight + e->lastShadeLight) / 2;
		}

		if (shadelight) {
			e->lastShadeLight = shadelight;
		} else {
			e->lastShadeLight = 1;
		}
	}

	// locate the proper data
	paliashdr = (aliashdr_t *)Mod_Extradata (e->model);

	c_alias_polys += paliashdr->numtris;

	// draw all the triangles
	glPushMatrix ();

	// fenix@io.com: model transform interpolation
	// joe: don't blend flame/fire model frames
	if (gl_interpolate_transform.value && !(clmodel->mflags & MOD_FLAME)) {
		R_BlendedRotateForEntity (e, 0);
	} else {
		R_RotateForEntity (e);
	}

	if  (gl_doubleeyes.value && (clmodel->mflags & MOD_EYES)) {
		glTranslatef (paliashdr->scale_origin[0], paliashdr->scale_origin[1], paliashdr->scale_origin[2] - (22 + 8));
		// double size of eyes, since they are really hard to see in gl
		glScalef (paliashdr->scale[0]*2, paliashdr->scale[1]*2, paliashdr->scale[2]*2);
	} else if (currententity == &cl.viewent) {
		float	scale = 0.5 + bound(0, r_viewmodelsize.value, 1) / 2;

		glTranslatef (paliashdr->scale_origin[0], paliashdr->scale_origin[1], paliashdr->scale_origin[2]);
		glScalef (paliashdr->scale[0] * scale, paliashdr->scale[1], paliashdr->scale[2]);
	} else {
		glTranslatef (paliashdr->scale_origin[0], paliashdr->scale_origin[1], paliashdr->scale_origin[2]);
		glScalef (paliashdr->scale[0], paliashdr->scale[1], paliashdr->scale[2]);
	}

	anim = (int)(cl.time*10) & 3;
	skinnum = currententity->skinnum;
	
	if ((skinnum >= paliashdr->numskins) || (skinnum < 0)) {
		Con_DPrintf ("R_DrawAliasModel: no such skin # %d\n", skinnum);
		skinnum = 0;
	}
	texture = paliashdr->gl_texturenum[skinnum][anim];
	fb_texture = paliashdr->fb_texturenum[skinnum][anim];

	// we can't dynamically colormap textures, so they are cached
	// seperately for the players. Heads are just uncolored.
	if (currententity->colormap != vid.colormap && !gl_nocolors.value) {
		i = e - cl_entities;
		if (i >= 1 && i <= cl.maxclients) {
			texture = playertextures + i;
			fb_texture = playerfbtextures + i;
		}
	}

	if (r_fullbright_draw) {
		fb_texture = 0;
	}

	if (gl_smoothmodels.value) {
		glShadeModel (GL_SMOOTH);
	}

	if (gl_affinemodels.value) {
		glHint (GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST);
	}

	if (fb_texture && gl_mtexable) {
		GL_DisableMultitexture ();
		glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
		GL_Bind (texture);

		GL_EnableMultitexture ();
		glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
		GL_Bind (fb_texture);

		// fenix@io.com: model animation interpolation
		if (gl_interpolate_animation.value && !(clmodel->mflags & MOD_FLAME)) {
			// if model's on list, use the given value
			if ((distance = R_DoWeaponInterpolation()) != -1) {
				R_SetupAliasBlendedFrame (e->frame, paliashdr, e, distance, true);
			// else if model's not on list, but is on JQ's weapon list, use gl_interdist
			} else if (clmodel->mflags & MOD_WEAPON) {
				R_SetupAliasBlendedFrame (e->frame, paliashdr, e, (int)gl_interdist.value, true);
			// else use the max distance
			} else {
				R_SetupAliasBlendedFrame (e->frame, paliashdr, e, INTERP_WEAP_MAXDIST, true);
			}
		} else {
			R_SetupAliasFrame (e->frame, paliashdr, true);
		}
		GL_DisableMultitexture ();
	} else {
		GL_DisableMultitexture ();
		glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
		GL_Bind (texture);
		
		// fenix@io.com: model animation interpolation
		if (gl_interpolate_animation.value && !(clmodel->mflags & MOD_FLAME)) {
			if ((distance = R_DoWeaponInterpolation()) != -1) {
				R_SetupAliasBlendedFrame (e->frame, paliashdr, e, distance, false);
			} else if (clmodel->mflags & MOD_WEAPON) {
				R_SetupAliasBlendedFrame (e->frame, paliashdr, e, (int)gl_interdist.value, false);
			} else {
				R_SetupAliasBlendedFrame (e->frame, paliashdr, e, INTERP_WEAP_MAXDIST, false);
			}
		} else {
			R_SetupAliasFrame (e->frame, paliashdr, false);
		}

		if (fb_texture)	{
			glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
			glEnable (GL_ALPHA_TEST);
			GL_Bind (fb_texture);

			// fenix@io.com: model animation interpolation
			if (gl_interpolate_animation.value && !(clmodel->mflags & MOD_FLAME)) {
				if ((distance = R_DoWeaponInterpolation()) != -1) {
					R_SetupAliasBlendedFrame (e->frame, paliashdr, e, distance, false);
				} else if (clmodel->mflags & MOD_WEAPON) {
					R_SetupAliasBlendedFrame (e->frame, paliashdr, e, (int)gl_interdist.value, false);
				} else {
					R_SetupAliasBlendedFrame (e->frame, paliashdr, e, INTERP_WEAP_MAXDIST, false);
				}
			} else {
				R_SetupAliasFrame (e->frame, paliashdr, false);
			}
			glDisable (GL_ALPHA_TEST);
		}
	}
	glShadeModel (GL_FLAT);

	if (gl_affinemodels.value) {
		glHint (GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
	}
	glPopMatrix ();

	// ahhh yeesss
	if (gl_coronas.value) {
		if (!ISUNDERWATER(r_viewleaf->contents)) {
			// somewhat redone this function
			// now uses enumerators
			if (clmodel->glowtype != FX_NORMAL) {
				vec3_t	lightorigin;
				float	radius;
				// set up for drawing later
				VectorCopy (e->origin, lightorigin);
				radius = clmodel->glowRadius;
				if (clmodel->glowtype == FX_TORCH && qmb_initialized) {
					lightorigin[2] += 8.0;
					radius += (float) (rand () & 3);
				} else if (clmodel->glowtype == FX_ENTITY && qmb_initialized) {
					lightorigin[2] += 1.5;
					radius += (fastcycle * 2.5);
				} else if (clmodel->glowtype == FX_BOLT && !qmb_initialized) {		// disable normal glow here if using qmb lightning
					radius += (float) (rand () & 7);
				} else if (clmodel->glowtype == FX_POWERUP && qmb_initialized) {
					lightorigin[2] += 20.0;
					radius += (slowcycle * 40.0);
				} else if (clmodel->glowtype == FX_MISSILE && qmb_initialized)	{
					lightorigin[0] += cos (e->angles[1] / 180 * M_PI) * (-20.0f);
					lightorigin[1] += sin (e->angles[1] / 180 * M_PI) * (-20.0f);
					lightorigin[2] += sin (e->angles[0] / 180 * M_PI) * (-20.0f);
				} else if (clmodel->glowtype == FX_SHAMBLER && !qmb_initialized) {	// disable normal glow here if using qmb lightning
					lightorigin[2] += 75.0;
					radius += (float) (rand () & 7);
				} 
				R_AddGlowEffect (clmodel->glowColours[0], clmodel->glowColours[1], clmodel->glowColours[2], radius, lightorigin);
			}
		}
	}

	if (r_shadows.value && r_noshadow_draw && e != &cl.viewent && r_viewleaf->contents != CONTENTS_EMPTY) {
		float			an;
		static	float	shadescale = 0;
		trace_t         downtrace;
		vec3_t          downmove;

		if (!shadescale) {
			shadescale = 1 / sqrt(2);
		}
		an = -e->angles[1] / 180 * M_PI;

		VectorSet (shadevector, cos(an) * shadescale, sin(an) * shadescale, shadescale);
		VectorNormalize (shadevector);

		glPushMatrix ();
		if (gl_interpolate_animation.value)	{
			R_BlendedRotateForEntity (e, 1);
		} else {
			glTranslatef (e->origin[0],  e->origin[1],  e->origin[2]);
			glRotatef (e->angles[1],  0, 0, 1);
		}
		VectorCopy (e->origin, downmove);
		downmove[2] = downmove[2] - 4096;
		memset (&downtrace, 0, sizeof(downtrace));

		SV_RecursiveHullCheck (cl.worldmodel->hulls, 0, 0, 1, e->origin, downmove, &downtrace);

		glDisable (GL_TEXTURE_2D);
		glEnable (GL_BLEND);
		glColor4f (0, 0, 0, r_shadows.value- ((mins[2]-downtrace.endpos[2])/60));

		if (!(clmodel->mflags & (MOD_WEAPON|MOD_SPIKE|MOD_LAVABALL)))
		{
			// fenix@io.com: model animation interpolation
			if (gl_interpolate_animation.value) {
				GL_DrawAliasBlendedShadow (paliashdr, lastposenum0, lastposenum, e);
			} else {
				GL_DrawAliasShadow (paliashdr, lastposenum);
			}
		}
		glEnable (GL_TEXTURE_2D);
		glDisable (GL_BLEND);
		glPopMatrix ();
	}
	glColor3f (1, 1, 1);
}

//==================================================================================

// joe: from FuhQuake
void R_SetSpritesState (qboolean state)
{
	static qboolean	r_state = false;

	if (r_state == state) return;

	r_state = state;

	if (state) {
		if (currententity->model->sprtype == MOD_SPR32)	{
			glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
			glEnable (GL_BLEND);
			glDepthMask (GL_FALSE);	// disable zbuffer updates
		} else {
			GL_DisableMultitexture ();
			glEnable (GL_ALPHA_TEST);
		}
	} else {
		if (currententity->model->sprtype == MOD_SPR32)	{
			glDisable (GL_BLEND);
			glDepthMask (GL_TRUE);	// enable zbuffer updates
		} else {
			glDisable (GL_ALPHA_TEST);
		}
	}
}

/*
=============
R_DrawCurrentEntity
=============
*/
void R_DrawCurrentEntity (void)
{
	vec3_t tmporg;

	switch (currententity->model->type)	{
	case mod_alias:
		if (!gl_part_flames.value && !strcmp(currententity->model->name, "progs/flame0.mdl")) {
			currententity->model = cl.model_precache[cl_modelindex[i_flame1]];
		} else if (qmb_initialized && gl_part_flames.value)	{
			VectorCopy (currententity->origin, tmporg);
			if (currententity->baseline.modelindex == cl_modelindex[i_flame0]) {
				tmporg[2] += 5.5;
				QMB_TorchFlame (tmporg);
			} else if (currententity->baseline.modelindex == cl_modelindex[i_flame1]) {
				tmporg[2] += 5.5;
				QMB_TorchFlame (tmporg);
				currententity->model = cl.model_precache[cl_modelindex[i_flame0]];
			} else if (currententity->baseline.modelindex == cl_modelindex[i_flame2]) {
				tmporg[2] -= 1;
				QMB_BigTorchFlame (tmporg);
			}
		}
		R_DrawAliasModel (currententity);
		break;

	case mod_md3:
		R_DrawQ3Model (currententity);
		break;

	case mod_brush:
		R_DrawBrushModel (currententity);
		break;

	default:
		break;
	}
}

/*
=============
R_DrawEntitiesOnList
=============
*/
void R_DrawEntitiesOnList (void)
{
	int	i;

	if (!r_drawentities.value) return;

	for (i=0 ; i<cl_numvisedicts ; i++) {
		currententity = cl_visedicts[i];
		if (currententity->transparency != 1 && currententity->transparency != 0 && !gl_notrans.value) {
			currententity->transignore = false;
			continue;
		}
		R_DrawCurrentEntity();
	}

	// draw sprites seperately, because of alpha blending
	for (i=0 ; i<cl_numvisedicts ; i++) {
		currententity = cl_visedicts[i];
		switch (currententity->model->type)	{
		case mod_sprite:
			R_SetSpritesState (true);
			R_DrawSpriteModel (currententity);
			break;

		default:
			break;
		}
	}
	R_SetSpritesState (false);
}

/*
=============
R_DrawTransEntities
=============
*/
void R_DrawTransEntities (void)
{
	// need to draw back to front
	// fixme: this isn't my favorite option
	int			i;
	float		bestdist, dist;
	entity_t	*bestent;
	vec3_t		start, test;
	
	VectorCopy (r_refdef.vieworg, start);

	if (!r_drawentities.value) return;
	if (!gl_notrans.value) return;

	transgetent:
	bestdist = 0;

	for (i=0 ; i<cl_numvisedicts ; i++)	{
		currententity = cl_visedicts[i];
		if (currententity->transignore)	continue;
		if (currententity->transparency == 1 || currententity->transparency == 0) continue;
		VectorCopy(currententity->origin, test);
		if (currententity->model->type == mod_brush) {
			test[0] += currententity->model->mins[0];
			test[1] += currententity->model->mins[1];
			test[2] += currententity->model->mins[2];
		}
		dist = (((test[0] - start[0]) * (test[0] - start[0])) +
				((test[1] - start[1]) * (test[1] - start[1])) +
				((test[2] - start[2]) * (test[2] - start[2])));

		if (dist > bestdist) {
			bestdist = dist;
			bestent = currententity;
		}
	}

	if (bestdist == 0) return;
	bestent->transignore = true;
	currententity = bestent;
	R_DrawCurrentEntity();
	goto transgetent;
}

/*
===========
R_ShouldDrawViewModel

Returns true if we should draw the view model
===========
*/
qboolean R_ShouldDrawViewModel (void)
{
	currententity = &cl.viewent;

	if (!r_drawviewmodel.value) {
		return false;
	}

	if (chase_active.value) {
		return false;
	}

	if (!r_drawentities.value) {
		return false;
	}

	if (cl.stats[STAT_HEALTH] <= 0) {
		return false;
	}

	if (!currententity->model) {
		return false;
	}
	return true;
}

/*
=============
R_DrawViewModel
=============
*/
void R_DrawViewModel (void)
{
	// fenix@io.com: model transform interpolation
	float	old_interpolate_transform;

	if (!R_ShouldDrawViewModel()) return;

	// LordHavoc: if the player is transparent, so is his gun
	currententity->transparency = model_alpha = cl_entities[cl.viewentity].transparency;

	// hack the depth range to prevent view model from poking into walls
	glDepthRange (gldepthmin, gldepthmin + 0.3 * (gldepthmax - gldepthmin));

	// fenix@io.com: model transform interpolation
	old_interpolate_transform = gl_interpolate_transform.value;
	gl_interpolate_transform.value = false;
	R_DrawCurrentEntity();
	gl_interpolate_transform.value = old_interpolate_transform;
	glDepthRange (gldepthmin, gldepthmax);
}


/*
============
R_PolyBlend
============
*/
void R_PolyBlend (void)
{
	if ((vid_hwgamma_enabled && gl_hwblend.value) || !v_blend[3]) return;

	glDisable (GL_ALPHA_TEST);
	glEnable (GL_BLEND);
	glDisable (GL_TEXTURE_2D);

	glColor4fv (v_blend);

	glBegin (GL_QUADS);
	glVertex2f (r_refdef.vrect.x, r_refdef.vrect.y);
	glVertex2f (r_refdef.vrect.x + r_refdef.vrect.width, r_refdef.vrect.y);
	glVertex2f (r_refdef.vrect.x + r_refdef.vrect.width, r_refdef.vrect.y + r_refdef.vrect.height);
	glVertex2f (r_refdef.vrect.x, r_refdef.vrect.y + r_refdef.vrect.height);
	glEnd ();

	glDisable (GL_BLEND);
	glEnable (GL_TEXTURE_2D);
	glEnable (GL_ALPHA_TEST);

	glColor3f (1, 1, 1);
}

/*
================
R_BrightenScreen
================
*/
void R_BrightenScreen (void)
{
	float	f;

	if (vid_hwgamma_enabled || gl_contrast.value <= 1.0) return;

	f = min(gl_contrast.value, 3);
	f = pow (f, vid_gamma);
	
	glDisable (GL_TEXTURE_2D);
	glEnable (GL_BLEND);
	glBlendFunc (GL_DST_COLOR, GL_ONE);
	glBegin (GL_QUADS);

	while (f > 1)
	{
		if (f >= 2)
			glColor3f (1, 1, 1);
		else
			glColor3f (f - 1, f - 1, f - 1);
		glVertex2f (0, 0);
		glVertex2f (vid.width, 0);
		glVertex2f (vid.width, vid.height);
		glVertex2f (0, vid.height);
		f *= 0.5;
	}
	glEnd ();
	glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	glEnable (GL_TEXTURE_2D);
	glDisable (GL_BLEND);
	glColor3f (1, 1, 1);
}

/*
===============
SignbitsForPlane
===============
*/
int SignbitsForPlane (mplane_t *out)
{
	int	bits, j;

	// for fast box on planeside test

	bits = 0;

	for (j=0 ; j<3 ; j++) {
		if (out->normal[j] < 0)
			bits |= 1<<j;
	}
	return bits;
}

/*
===============
R_SetFrustum
===============
*/
void R_SetFrustum (void)
{
	int	i;

	// rotate VPN right by FOV_X/2 degrees
	RotatePointAroundVector (frustum[0].normal, vup, vpn, -(90-r_refdef.fov_x / 2));
	// rotate VPN left by FOV_X/2 degrees
	RotatePointAroundVector (frustum[1].normal, vup, vpn, 90-r_refdef.fov_x / 2);
	// rotate VPN up by FOV_X/2 degrees
	RotatePointAroundVector (frustum[2].normal, vright, vpn, 90-r_refdef.fov_y / 2);
	// rotate VPN down by FOV_X/2 degrees
	RotatePointAroundVector (frustum[3].normal, vright, vpn, -(90 - r_refdef.fov_y / 2));

	for (i=0 ; i<4 ; i++) {
		frustum[i].type = PLANE_ANYZ;
		frustum[i].dist = DotProduct(r_origin, frustum[i].normal);
		frustum[i].signbits = SignbitsForPlane (&frustum[i]);
	}
}

/*
===============
R_SetupFrame
===============
*/
void R_SetupFrame (void)
{
	vec3_t		testorigin;
	mleaf_t		*leaf;

	if (nehahra) {
		if (oldsky.value && r_skybox.string[0]) {
			Cvar_Set ("r_skybox", "");
		}

		if (!oldsky.value && !r_skybox.string[0]) {
			Cvar_Set ("r_skybox", prev_skybox);
		}
	}
	wateralpha = r_wateralpha.value;
	watershade = r_liquidshade.value;

	R_AnimateLight ();

	r_framecount++;

// build the transformation matrix for the given view angles
	VectorCopy (r_refdef.vieworg, r_origin);
	AngleVectors (r_refdef.viewangles, vpn, vright, vup);

// current viewleaf
	r_oldviewleaf = r_viewleaf;
	r_oldviewleaf2 = r_viewleaf2;

	r_viewleaf = Mod_PointInLeaf (r_origin, cl.worldmodel);
	r_viewleaf2 = NULL;

	// check above and below so crossing solid water doesn't draw wrong
	if (r_viewleaf->contents <= CONTENTS_WATER && r_viewleaf->contents >= CONTENTS_LAVA) {
		// look up a bit
		VectorCopy (r_origin, testorigin);
		testorigin[2] += 10;
		leaf = Mod_PointInLeaf (testorigin, cl.worldmodel);
		if (leaf->contents == CONTENTS_EMPTY) {
			r_viewleaf2 = leaf;
		}
	} else if (r_viewleaf->contents == CONTENTS_EMPTY) {
		// look down a bit
		VectorCopy (r_origin, testorigin);
		testorigin[2] -= 10;
		leaf = Mod_PointInLeaf (testorigin, cl.worldmodel);
		if (leaf->contents <= CONTENTS_WATER &&	leaf->contents >= CONTENTS_LAVA) {
			r_viewleaf2 = leaf;
		}
	}

	V_SetContentsColor (r_viewleaf->contents);
	V_Setfog (r_viewleaf->contents);
	V_CalcBlend ();

	r_cache_thrash = false;

	c_brush_polys = 0;
	c_alias_polys = 0;
}

__inline void GL_Perspective (GLdouble fov, GLdouble aspectr, GLdouble zNear)
{
	static const GLdouble nudge = 1.0 - 1.0 / ((GLdouble) (1<<23));

	static GLdouble	p[4][4]	= {
		{ 0.0,    0.0,    0.0,    0.0 },
		{ 0.0,    0.0,    0.0,    0.0 },
		{ 0.0,    0.0,    0.0,   -1.0 },
		{ 0.0,    0.0,    0.0,    0.0 }
	};

	p[0][0] = 1.0 / (aspectr * tan (fov));
	p[1][1] = 1.0 / tan (fov);
	p[2][2] = -nudge;
	p[3][2] = -2.0 * zNear * nudge;

	glLoadMatrixd (&p[0][0]);
}

/*
=============
R_SetupGL
=============
*/
void R_SetupGL (void)
{
	float	screenaspect;
	int		x, x2, y2, y, w, h;

	// set up viewpoint
	glMatrixMode (GL_PROJECTION);
	glLoadIdentity ();
	x = r_refdef.vrect.x * glwidth/vid.width;
	x2 = (r_refdef.vrect.x + r_refdef.vrect.width) * glwidth/vid.width;
	y = (vid.height-r_refdef.vrect.y) * glheight/vid.height;
	y2 = (vid.height - (r_refdef.vrect.y + r_refdef.vrect.height)) * glheight/vid.height;

	// fudge around because of frac screen scale
	if (x > 0) x--;
	if (x2 < glwidth) x2++;
	if (y2 < 0) y2--;
	if (y < glheight) y++;

	w = x2 - x;
	h = y - y2;

	glViewport (glx + x, gly + y2, w, h);
	screenaspect = (float)r_refdef.vrect.width/r_refdef.vrect.height;
	GL_Perspective (atan((GLdouble)r_refdef.vrect.height / (GLdouble)r_refdef.vrect.width), (GLdouble)screenaspect, 5.0);

	glCullFace(GL_FRONT);

	glMatrixMode (GL_MODELVIEW);
	glLoadIdentity ();

	// put Z going up and Y going deep
	glRotatef (-90, 1, 0, 0);
	glRotatef (90, 0, 0, 1);

	// set the view according to where the player actually is in the map!!!
	glRotatef (-r_refdef.viewangles[2], 1, 0, 0);
	glRotatef (-r_refdef.viewangles[0], 0, 1, 0);
	glRotatef (-r_refdef.viewangles[1], 0, 0, 1);

	glTranslatef (-r_refdef.vieworg[0], -r_refdef.vieworg[1], -r_refdef.vieworg[2]);

	glGetFloatv (GL_MODELVIEW_MATRIX, r_world_matrix);

	// set drawing parms
	if (gl_cull.value) {
		glEnable (GL_CULL_FACE);
	} else {
		glDisable (GL_CULL_FACE);
	}
	glDisable (GL_BLEND);
	glDisable (GL_ALPHA_TEST);
	glEnable (GL_DEPTH_TEST);
}

//========================================================================================//

/*
===============
R_Init
===============
*/
void R_Init (void)
{	
	void R_ToggleParticles_f (void);

	Cmd_AddCommand ("timerefresh", R_TimeRefresh_f);
	Cmd_AddCommand ("pointfile", R_ReadPointFile_f);
	Cmd_AddCommand ("toggleparticles", R_ToggleParticles_f);
	Cmd_AddCommand ("set_interpolated_weapon", R_Interpolated_Weapon_f);

	Cvar_RegisterVariable (&r_lightmap);
	Cvar_RegisterVariable (&r_fullbright);
	Cvar_RegisterVariable (&r_drawentities);
	Cvar_RegisterVariable (&r_drawviewmodel);
	Cvar_RegisterVariable (&r_viewmodelsize);
	Cvar_RegisterVariable (&r_shadows);
	Cvar_RegisterVariable (&r_wateralpha);
	Cvar_RegisterVariable (&r_liquidshade);
	Cvar_RegisterVariable (&r_dynamic);
	Cvar_RegisterVariable (&r_novis);
	Cvar_RegisterVariable (&r_speeds);
	Cvar_RegisterVariable (&r_fullbrightskins);
	Cvar_RegisterVariable (&r_fastsky);
	Cvar_RegisterVariable (&r_skycolor);
	Cvar_RegisterVariable (&r_skybox);
	Cvar_RegisterVariable (&r_farclip);
	Cvar_RegisterVariable (&r_waterripple);

	// fenix@io.com: register new cvar for model interpolation
	Cvar_RegisterVariable (&gl_interpolate_animation);
	Cvar_RegisterVariable (&gl_interpolate_transform);

	Cvar_RegisterVariable (&gl_finish);
	Cvar_RegisterVariable (&gl_clear);

	Cvar_RegisterVariable (&gl_cull);
	Cvar_RegisterVariable (&gl_ztrick);
	Cvar_RegisterVariable (&gl_smoothmodels);
	Cvar_RegisterVariable (&gl_affinemodels);
	Cvar_RegisterVariable (&gl_subdivide_size);
	Cvar_RegisterVariable (&gl_polyblend);
	Cvar_RegisterVariable (&gl_flashblend);
	Cvar_RegisterVariable (&gl_playermip);
	Cvar_RegisterVariable (&gl_nocolors);
	Cvar_RegisterVariable (&gl_loadlitfiles);
	Cvar_RegisterVariable (&gl_lerpimages);
	Cvar_RegisterVariable (&gl_doubleeyes);
	Cvar_RegisterVariable (&gl_interdist);
	Cvar_RegisterVariable (&gl_waterfog);
	Cvar_RegisterVariable (&gl_waterfog_density);
	Cvar_RegisterVariable (&gl_detail);
	Cvar_RegisterVariable (&gl_caustics);
	Cvar_RegisterVariable (&gl_shiny);
	Cvar_RegisterVariable (&gl_ringalpha);
	Cvar_RegisterVariable (&gl_fb_bmodels);
	Cvar_RegisterVariable (&gl_fb_models);
	Cvar_RegisterVariable (&gl_vertexlights);
	Cvar_RegisterVariable (&gl_coronas);
	Cvar_RegisterVariable (&gl_triplebuffer);

	Cvar_RegisterVariable (&gl_part_explosions);
	Cvar_RegisterVariable (&gl_part_trails);
	Cvar_RegisterVariable (&gl_part_spikes);
	Cvar_RegisterVariable (&gl_part_gunshots);
	Cvar_RegisterVariable (&gl_part_blood);
	Cvar_RegisterVariable (&gl_part_telesplash);
	Cvar_RegisterVariable (&gl_part_blobs);
	Cvar_RegisterVariable (&gl_part_lavasplash);
	Cvar_RegisterVariable (&gl_part_inferno);
	Cvar_RegisterVariable (&gl_part_flames);
	Cvar_RegisterVariable (&gl_part_lightning);

	Cvar_RegisterVariable (&gl_fogenable); 
	Cvar_RegisterVariable (&gl_fogstart); 
	Cvar_RegisterVariable (&gl_fogend); 
	Cvar_RegisterVariable (&gl_fogred); 
	Cvar_RegisterVariable (&gl_fogblue); 
	Cvar_RegisterVariable (&gl_foggreen);
	Cvar_RegisterVariable (&gl_fogdensity);
	Cvar_RegisterVariable (&gl_fogalpha);
	
	Cmd_AddLegacyCommand ("loadsky", "r_skybox");

	if (gl_fogenable.value) {
		glDisable (GL_FOG);
	}
	R_InitTextures ();
	R_InitBubble ();
	R_InitParticles ();
	R_InitVertexLights ();

	// skins
	playertextures = texture_extension_number;
	texture_extension_number += MAX_SCOREBOARD+1;

	// fullbright skins
	playerfbtextures = texture_extension_number;
	texture_extension_number += MAX_SCOREBOARD+1;

	// by joe
	skyboxtextures = texture_extension_number;
	texture_extension_number += 6;

	R_InitOtherTextures ();

	if (gl_fogenable.value) {
		glEnable (GL_FOG);
	}
}


/*
================
R_RenderScene

r_refdef must be set before the first call
================
*/
void R_RenderScene (void)
{
	R_SetupFrame ();

	R_SetFrustum ();

	R_SetupGL ();

	R_MarkLeaves ();	// done here so we know if we're in water

	R_DrawWorld ();		// adds static entities to the list

	S_ExtraUpdate ();	// don't let sound get messed up if going slow

	R_DrawEntitiesOnList ();

	R_DrawWaterSurfaces ();

	GL_DisableMultitexture ();
}


/*
=============
R_Clear
=============
*/
int	gl_ztrickframe = 0;

void R_Clear (void)
{
	static qboolean	cleartogray;
	qboolean		clear = false;

	if (gl_clear.value) {
		clear = true;
		if (cleartogray) {
			glClearColor (1, 0, 0, 0);
			cleartogray = false;
		}
	} else if (!vid_hwgamma_enabled && gl_contrast.value > 1) {
		clear = true;
		if (!cleartogray) {
			glClearColor (0.1, 0.1, 0.1, 0);
			cleartogray = true;
		}
	}

	if (gl_ztrick.value) {
		if (clear) {
			glClear (GL_COLOR_BUFFER_BIT);
		}
		gl_ztrickframe = !gl_ztrickframe;
		if (gl_ztrickframe) {
			gldepthmin = 0;
			gldepthmax = 0.49999;
			glDepthFunc (GL_LEQUAL);
		} else {
			gldepthmin = 1;
			gldepthmax = 0.5;
			glDepthFunc (GL_GEQUAL);
		}
	} else {
		if (clear) {
			glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
		} else {
			glClear (GL_DEPTH_BUFFER_BIT);
		}
		gldepthmin = 0;
		gldepthmax = 1;
		glDepthFunc (GL_LEQUAL);
	}

	if (stencildraw == true  && r_shadows.value > 0) {
		glClearStencil(true);
		glClear(GL_STENCIL_BUFFER_BIT);
	}
	glDepthRange (gldepthmin, gldepthmax);
}

/*
================
R_RenderView

r_refdef must be set before the first call
================
*/
void R_RenderView (void)
{
	double	time1 = 0.0, time2;
	GLfloat colors[4] = {(GLfloat) 0.0, (GLfloat) 0.0, (GLfloat) 1, (GLfloat) 0.20};

	if (!r_worldentity.model || !cl.worldmodel) {
		Sys_Error ("R_RenderView: NULL worldmodel");
	}

	if (r_speeds.value) {
		glFinish ();
		time1 = Sys_DoubleTime ();
		c_brush_polys = 0;
		c_alias_polys = 0;
	}

	if (gl_finish.value) {
		glFinish ();
	}

	// we want this every frame whether we draw or not
	frametime = cl.time - cl.oldtime;

	// one pulse cycle (down to up and back again) every second
	slowpulse = slowpulse + (frametime * slowpulsedir);

	if (slowpulse > 0.5) {
		slowpulse = 0.5;
		slowpulsedir = -1;
	}

	if (slowpulse < 0.0) {
		slowpulse = 0.0;
		slowpulsedir = 1;
	}

	// one pulse cycle (down to up and back again) every tenth of a second
	fastpulse = fastpulse + (frametime * fastpulsedir);

	if (fastpulse > 0.05) {
		fastpulse = 0.05;
		fastpulsedir = -1;
	}

	if (fastpulse < 0.0) {
		fastpulse = 0.0;
		fastpulsedir = 1;
	}

	// one pulse cycle (down to up and back again) every 10 seconds
	killpulse = killpulse + (frametime * killpulsedir);

	if (killpulse > 5.0) {
		killpulse = 5.0;
		killpulsedir = -1;
	}

	if (killpulse < 0.0) {
		killpulse = 0.0;
		killpulsedir = 1;
	}

	fastcycle = fastpulse * 10;
	slowcycle = slowpulse;
	killcycle = killpulse / 10;

	R_Clear ();

	// render normal view
	R_RenderScene ();
	R_RenderDlights ();

	if (gl_fogenable.value) {
		glDisable (GL_FOG);
	}
	
	R_DrawParticles ();

	if (gl_fogenable.value) {
		glFogi(GL_FOG_MODE, GL_LINEAR);
			
			colors[0] = gl_fogred.value;
			colors[1] = gl_foggreen.value;
			colors[2] = gl_fogblue.value; 
		
		glFogfv(GL_FOG_COLOR, colors); 
		glFogf(GL_FOG_START, gl_fogstart.value); 
		glFogf(GL_FOG_END, gl_fogend.value);
		glFogf(GL_FOG_DENSITY, gl_fogdensity.value); 
		glEnable (GL_FOG);
	}
	else {
		glDisable(GL_FOG);
	}
	
	R_DrawViewModel ();

	// always true if not -nehahra
	R_DrawTransEntities ();
	R_RenderGlowEffects ();

	if (r_speeds.value)	{
		time2 = Sys_DoubleTime ();
		Con_Printf ("%3i ms  %4i wpoly %4i epoly\n", (int)((time2-time1)*1000), c_brush_polys, c_alias_polys);
	}
}