path: root/source/sw_main.c

/*
Copyright (C) 1997-2001 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.

*/
// r_main.c

#include "sw_local.h"

#ifndef REF_HARD_LINKED
/* declare imports for this module */
cmdAPI_t	cmd;
cvarAPI_t	cvar;
fsAPI_t		fs;
commonAPI_t	com;
sysAPI_t	sys;
videoAPI_t	vidsw;
#else
videoAPI_t	video;
#define		vidsw		video
#endif

viddef_t	vid;

unsigned	d_8to24table[256];

entity_t	r_worldentity;

char		skyname[MAX_QPATH];
float		skyrotate;
vec3_t		skyaxis;
image_t		*sky_images[6];

refdef_t	r_newrefdef;
model_t		*currentmodel;

model_t		*r_worldmodel;

byte		r_warpbuffer[WARP_WIDTH * WARP_HEIGHT];

swstate_t sw_state;

vec3_t		viewlightvec;
alight_t	r_viewlighting = {128, 192, viewlightvec};
float		r_time1;
int			r_numallocatededges;
float		r_aliasuvscale = 1.0;
int			r_outofsurfaces;
int			r_outofedges;

qboolean	r_dowarp;

mvertex_t	*r_pcurrentvertbase;

int			c_surf;
int			r_maxsurfsseen, r_maxedgesseen, r_cnumsurfs;
qboolean	r_surfsonstack;
int			r_clipflags;

//
// view origin
//
vec3_t	vup, base_vup;
vec3_t	vpn, base_vpn;
vec3_t	vright, base_vright;
vec3_t	r_origin;

//
// screen size info
//
oldrefdef_t	r_refdef;
float		xcenter, ycenter;
float		xscale, yscale;
float		xscaleinv, yscaleinv;
float		xscaleshrink, yscaleshrink;
float		aliasxscale, aliasyscale, aliasxcenter, aliasycenter;

int		r_screenwidth;

float	verticalFieldOfView;
float	xOrigin, yOrigin;

mplane_t	screenedge[4];

//
// refresh flags
//
int		r_framecount = 1;	// so frame counts initialized to 0 don't match
int		r_visframecount;
int		d_spanpixcount;
int		r_polycount;
int		r_drawnpolycount;
int		r_wholepolycount;

int			*pfrustum_indexes[4];
int			r_frustum_indexes[4*6];

mleaf_t		*r_viewleaf;
int			r_viewcluster, r_oldviewcluster;

image_t  	*r_notexture_mip;

float	da_time1, da_time2, dp_time1, dp_time2, db_time1, db_time2, rw_time1, rw_time2;
float	se_time1, se_time2, de_time1, de_time2;

void R_MarkLeaves (void);

cvar_t	*sw_aliasstats;
cvar_t	*sw_allow_modex;
cvar_t	*sw_clearcolor;
cvar_t	*sw_drawflat;
cvar_t	*sw_draworder;
cvar_t	*sw_maxedges;
cvar_t	*sw_maxsurfs;
cvar_t	*sw_reportedgeout;
cvar_t	*sw_reportsurfout;
cvar_t  *sw_stipplealpha;
cvar_t	*sw_surfcacheoverride;
cvar_t	*sw_waterwarp;

//Start Added by Lewey
// These flags allow you to turn SIRDS on and
// off from the console.
cvar_t	*sw_drawsird;
//End Added by Lewey

cvar_t	*r_drawworld;
cvar_t	*r_drawentities;
cvar_t	*r_dspeeds;
cvar_t	*r_fullbright;
cvar_t  *r_lerpmodels;
cvar_t  *r_novis;

cvar_t	*r_speeds;

cvar_t	*vid_gamma;

//PGM
cvar_t	*sw_lockpvs;
//PGM

#ifndef USE_ASM

// all global and static refresh variables are collected in a contiguous block
// to avoid cache conflicts.

//-------------------------------------------------------
// global refresh variables
//-------------------------------------------------------

// FIXME: make into one big structure, like cl or sv
// FIXME: do separately for refresh engine and driver

float	d_sdivzstepu, d_tdivzstepu, d_zistepu;
float	d_sdivzstepv, d_tdivzstepv, d_zistepv;
float	d_sdivzorigin, d_tdivzorigin, d_ziorigin;

fixed16_t	sadjust, tadjust, bbextents, bbextentt;

pixel_t			*cacheblock;
int				cachewidth;
pixel_t			*d_viewbuffer;
short			*d_pzbuffer;
unsigned int	d_zrowbytes;
unsigned int	d_zwidth;

#else

void            *d_pcolormap;

#endif	// USE_ASM

byte	r_notexture_buffer[512];

/*
==================
R_InitTextures
==================
*/
void	R_InitTextures (void)
{
	int		x,y, m;
	byte	*dest;
	
// create a simple checkerboard texture for the default
	r_notexture_mip = (image_t *)&r_notexture_buffer;
	
	r_notexture_mip->width = r_notexture_mip->height = 16;
	r_notexture_mip->upload_width = r_notexture_mip->upload_height = 16;
	r_notexture_mip->pixels[0] = &r_notexture_buffer[sizeof(image_t)];
	r_notexture_mip->pixels[1] = r_notexture_mip->pixels[0] + 16*16;
	r_notexture_mip->pixels[2] = r_notexture_mip->pixels[1] + 8*8;
	r_notexture_mip->pixels[3] = r_notexture_mip->pixels[2] + 4*4;
	
	for( m = 0; m < 4; m++ ) {
		dest = r_notexture_mip->pixels[m];
		for ( y = 0; y < ( 16 >> m ); y++ )
			for( x = 0; x < ( 16 >> m ); x++ ) {
				if( ( y < ( 8 >> m ) ) ^ ( x < ( 8 >> m ) ) )
					*dest++ = 0;
				else
					*dest++ = 1;
			}
	}	
}


/*
================
R_InitTurb
================
*/
void R_InitTurb (void)
{
	int		i;
	
	for (i=0 ; i<CYCLE*2 ; i++)
	{
		sintable[i] = AMP + sin(i*M_PI*2/CYCLE)*AMP;
		intsintable[i] = AMP2 + sin(i*M_PI*2/CYCLE)*AMP2;	// AMP2, not 20
		blanktable[i] = 0;			//PGM
	}
}

void R_ImageList_f( void );
void D_SCDump_f (void);

void R_Register (void)
{
	sw_aliasstats = cvar.Get ("sw_polymodelstats", "0", 0);
	sw_allow_modex = cvar.Get( "sw_allow_modex", "1", CVAR_ARCHIVE );
	sw_clearcolor = cvar.Get ("sw_clearcolor", "2", 0);
	sw_drawflat = cvar.Get ("sw_drawflat", "0", CVAR_CHEAT);
	sw_draworder = cvar.Get ("sw_draworder", "0", CVAR_CHEAT);
	sw_maxedges = cvar.Get ("sw_maxedges", va( "%i", NUMSTACKEDGES ), 0);
	sw_maxsurfs = cvar.Get ("sw_maxsurfs", va( "%i", NUMSTACKSURFACES ), 0);
	sw_mipcap = cvar.Get ("sw_mipcap", "0", 0);
	sw_mipscale = cvar.Get ("sw_mipscale", "1", 0);
	sw_reportedgeout = cvar.Get ("sw_reportedgeout", "0", 0);
	sw_reportsurfout = cvar.Get ("sw_reportsurfout", "0", 0);
	sw_stipplealpha = cvar.Get( "sw_stipplealpha", "0", CVAR_ARCHIVE );
	sw_waterwarp = cvar.Get ("sw_waterwarp", "1", 0);

	//Start Added by Lewey
	sw_drawsird = cvar.Get ("sw_drawsird", "0", 0);
	//End Added by Lewey

	r_speeds = cvar.Get ("r_speeds", "0", 0);
	r_fullbright = cvar.Get ("r_fullbright", "0", CVAR_CHEAT);
	r_drawentities = cvar.Get ("r_drawentities", "1", 0);
	r_drawworld = cvar.Get ("r_drawworld", "1", CVAR_CHEAT);
	r_dspeeds = cvar.Get ("r_dspeeds", "0", 0);
	r_lerpmodels = cvar.Get( "r_lerpmodels", "1", 0 );
	r_novis = cvar.Get( "r_novis", "0", 0 );

	vid_gamma = cvar.Get( "vid_gamma", "1.0", CVAR_ARCHIVE|CVAR_LATCHED );

	cmd.AddCommand ("modellist", Mod_Modellist_f);
	cmd.AddCommand( "screenshot", R_ScreenShot_f );
	cmd.AddCommand( "scdump", D_SCDump_f );

	vid_gamma->modified = qtrue; // force us to rebuild the gamma table later

//PGM
	sw_lockpvs = cvar.Get ("sw_lockpvs", "0", 0);
//PGM

}

void R_UnRegister (void)
{
	cmd.RemoveCommand( "screenshot" );
	cmd.RemoveCommand ("modellist");
	cmd.RemoveCommand( "scdump" );
}

static void R_ModeChanged( int width, int height, int flags,
    int rowbytes, void *pixels )
{
	vid.width = width;
	vid.height = height;
    vid.buffer = pixels;
    vid.rowbytes = rowbytes;

	sw_surfcacheoverride = cvar.Get ("sw_surfcacheoverride", "0", 0);

    D_FlushCaches();

	if( d_pzbuffer ) {
		com.Free( d_pzbuffer );
		d_pzbuffer = NULL;
	}

	// free surface cache
	if( sc_base ) {
		com.Free( sc_base );
		sc_base = NULL;
	}

	d_pzbuffer = R_Malloc( vid.width * vid.height * 2 );
    memset( d_pzbuffer, 0, vid.width * vid.height * 2 ); 

	R_InitCaches();

	R_GammaCorrectAndSetPalette( ( const byte * ) d_8to24table );
}

/*
===============
R_Init
===============
*/
qboolean R_Init( qboolean total ) {
	Com_DPrintf( "R_Init( %i )\n", total );

	if( !total ) {
		R_InitImages();
		Draw_Init();
		Mod_Init();
		return qtrue;
	}

	Com_Printf( "ref_soft " VERSION ", " __DATE__ "\n" );

// TODO: collect 386-specific code in one place
#if USE_ASM
	Sys_MakeCodeWriteable( ( long )R_EdgeCodeStart, ( long )R_EdgeCodeEnd - ( long )R_EdgeCodeStart );
	Sys_SetFPCW ();		// get bit masks for FPCW	(FIXME: is this USE_ASM?)
#endif	// USE_ASM

	r_aliasuvscale = 1.0;

	// create the window
	if( !vidsw.Init() ) {
		return qfalse;
	}

	R_Register();

	R_InitImageManager();

	/* get the palette before we create the window */
	R_InitImages();

	view_clipplanes[0].leftedge = qtrue;
	view_clipplanes[1].rightedge = qtrue;
	view_clipplanes[1].leftedge =
    view_clipplanes[2].leftedge =
    view_clipplanes[3].leftedge = qfalse;
	view_clipplanes[0].rightedge =
    view_clipplanes[2].rightedge =
    view_clipplanes[3].rightedge = qfalse;

	r_refdef.xOrigin = XCENTERING;
	r_refdef.yOrigin = YCENTERING;

	R_InitTextures();
	R_InitTurb();

	Draw_Init();
	Mod_Init();

	R_BuildGammaTable();
	R_GammaCorrectAndSetPalette( ( const byte * ) d_8to24table );

	return qtrue;
}

/*
===============
R_Shutdown
===============
*/
void R_Shutdown( qboolean total ) {
	Com_DPrintf( "R_Shutdown( %i )\n", total );

	D_FlushCaches();

	Mod_FreeAll();

	R_ShutdownImages();

	if( !total ) {
		return;
	}

	// free z buffer
	if( d_pzbuffer ) {
		com.Free( d_pzbuffer );
		d_pzbuffer = NULL;
	}

	// free surface cache
	if( sc_base ) {
		com.Free( sc_base );
		sc_base = NULL;
	}

	// free colormap
	if( vid.colormap ) {
		com.Free( vid.colormap );
		vid.colormap = NULL;
	}

	R_UnRegister();

	R_ShutdownImageManager();

	vidsw.Shutdown();
}

/*
===============
R_NewMap
===============
*/
void R_NewMap (void)
{
	r_viewcluster = -1;

	r_cnumsurfs = sw_maxsurfs->integer;

	if (r_cnumsurfs <= MINSURFACES)
		r_cnumsurfs = MINSURFACES;

	if (r_cnumsurfs > NUMSTACKSURFACES)
	{
		surfaces = R_Malloc (r_cnumsurfs * sizeof(surf_t));
        memset( surfaces, 0, r_cnumsurfs * sizeof(surf_t) );
		surface_p = surfaces;
		surf_max = &surfaces[r_cnumsurfs];
		r_surfsonstack = qfalse;
	// surface 0 doesn't really exist; it's just a dummy because index 0
	// is used to indicate no edge attached to surface
		surfaces--;
		R_SurfacePatch ();
	}
	else
	{
		r_surfsonstack = qtrue;
	}

	r_maxedgesseen = 0;
	r_maxsurfsseen = 0;

	r_numallocatededges = sw_maxedges->integer;

	if (r_numallocatededges < MINEDGES)
		r_numallocatededges = MINEDGES;

	if (r_numallocatededges <= NUMSTACKEDGES)
	{
		auxedges = NULL;
	}
	else
	{
		auxedges = R_Malloc (r_numallocatededges * sizeof(edge_t));
        memset( auxedges, 0, r_numallocatededges * sizeof(edge_t) );
	}
}


/*
===============
R_MarkLeaves

Mark the leaves and nodes that are in the PVS for the current
cluster
===============
*/
void R_MarkLeaves (void)
{
	byte	*vis;
	mnode_t	*node;
	int		i;
	mleaf_t	*leaf;
	int		cluster;

	if (r_oldviewcluster == r_viewcluster && !r_novis->integer &&
            r_viewcluster != -1)
    {
		return;
    }
	
	// development aid to let you run around and see exactly where
	// the pvs ends
	if (sw_lockpvs->integer)
		return;

	r_visframecount++;
	r_oldviewcluster = r_viewcluster;

	if (r_novis->integer || r_viewcluster == -1 || !r_worldmodel->vis)
	{
		// mark everything
		for (i=0 ; i<r_worldmodel->numleafs ; i++)
			r_worldmodel->leafs[i].visframe = r_visframecount;
		for (i=0 ; i<r_worldmodel->numnodes ; i++)
			r_worldmodel->nodes[i].visframe = r_visframecount;
		return;
	}

	vis = Mod_ClusterPVS (r_viewcluster, r_worldmodel);
	
	for (i=0,leaf=r_worldmodel->leafs ; i<r_worldmodel->numleafs ; i++, leaf++)
	{
		cluster = leaf->cluster;
		if (cluster == -1)
			continue;
		if (Q_IsBitSet( vis, cluster ))
		{
			node = (mnode_t *)leaf;
			do
			{
				if (node->visframe == r_visframecount)
					break;
				node->visframe = r_visframecount;
				node = node->parent;
			} while (node);
		}
	}

}

/*
** R_DrawNullModel
**
** IMPLEMENT THIS!
*/
void R_DrawNullModel( void )
{
}

/*
=============
R_DrawEntitiesOnList
=============
*/
void R_DrawEntitiesOnList (void)
{
	int			i;
	qboolean	translucent_entities = qfalse;

	if (!r_drawentities->value)
		return;

	// all bmodels have already been drawn by the edge list
	for (i=0 ; i<r_newrefdef.num_entities ; i++)
	{
		currententity = &r_newrefdef.entities[i];

		if ( currententity->flags & RF_TRANSLUCENT )
		{
			translucent_entities = qtrue;
			continue;
		}

		if ( currententity->flags & RF_BEAM )
		{
			modelorg[0] = -r_origin[0];
			modelorg[1] = -r_origin[1];
			modelorg[2] = -r_origin[2];
			VectorCopy( vec3_origin, r_entorigin );
			R_DrawBeam( currententity );
		}
		else
		{
			currentmodel = R_ModelForHandle( currententity->model );
			if (!currentmodel)
			{
				R_DrawNullModel();
				continue;
			}
			VectorCopy (currententity->origin, r_entorigin);
			VectorSubtract (r_origin, r_entorigin, modelorg);

			switch (currentmodel->type)
			{
			case mod_sprite:
				R_DrawSprite ();
				break;

			case mod_alias:
				R_AliasDrawModel ();
				break;

			default:
				break;
			}
		}
	}

	if ( !translucent_entities )
		return;

	for (i=0 ; i<r_newrefdef.num_entities ; i++)
	{
		currententity = &r_newrefdef.entities[i];

		if ( !( currententity->flags & RF_TRANSLUCENT ) )
			continue;

		if ( currententity->flags & RF_BEAM )
		{
			modelorg[0] = -r_origin[0];
			modelorg[1] = -r_origin[1];
			modelorg[2] = -r_origin[2];
			VectorCopy( vec3_origin, r_entorigin );
			R_DrawBeam( currententity );
		}
		else
		{
			currentmodel = R_ModelForHandle( currententity->model );
			if (!currentmodel)
			{
				R_DrawNullModel();
				continue;
			}
			VectorCopy (currententity->origin, r_entorigin);
			VectorSubtract (r_origin, r_entorigin, modelorg);

			switch (currentmodel->type)
			{
			case mod_sprite:
				R_DrawSprite ();
				break;

			case mod_alias:
				R_AliasDrawModel ();
				break;

			default:
				break;
			}
		}
	}
}


/*
=============
R_BmodelCheckBBox
=============
*/
int R_BmodelCheckBBox (float *minmaxs)
{
	int			i, *pindex, clipflags;
	vec3_t		acceptpt, rejectpt;
	float		d;

	clipflags = 0;

	for (i=0 ; i<4 ; i++)
	{
	// generate accept and reject points
	// FIXME: do with fast look-ups or integer tests based on the sign bit
	// of the floating point values

		pindex = pfrustum_indexes[i];

		rejectpt[0] = minmaxs[pindex[0]];
		rejectpt[1] = minmaxs[pindex[1]];
		rejectpt[2] = minmaxs[pindex[2]];
		
		d = DotProduct (rejectpt, view_clipplanes[i].normal);
		d -= view_clipplanes[i].dist;

		if (d <= 0)
			return BMODEL_FULLY_CLIPPED;

		acceptpt[0] = minmaxs[pindex[3+0]];
		acceptpt[1] = minmaxs[pindex[3+1]];
		acceptpt[2] = minmaxs[pindex[3+2]];

		d = DotProduct (acceptpt, view_clipplanes[i].normal);
		d -= view_clipplanes[i].dist;

		if (d <= 0)
			clipflags |= (1<<i);
	}

	return clipflags;
}


/*
===================
R_FindTopnode

Find the first node that splits the given box
===================
*/
mnode_t *R_FindTopnode (vec3_t mins, vec3_t maxs)
{
	mplane_t	*splitplane;
	int			sides;
	mnode_t *node;

	node = r_worldmodel->nodes;

	while (1)
	{
		if (node->visframe != r_visframecount)
			return NULL;		// not visible at all
		
		if (node->contents != CONTENTS_NODE)
		{
			if (node->contents != CONTENTS_SOLID)
				return	node; // we've reached a non-solid leaf, so it's
							//  visible and not BSP clipped
			return NULL;	// in solid, so not visible
		}
		
		splitplane = node->plane;
		sides = BoxOnPlaneSideFast(mins, maxs, (cplane_t *)splitplane);
		
		if (sides == 3)
			return node;	// this is the splitter
		
	// not split yet; recurse down the contacted side
		if (sides & 1)
			node = node->children[0];
		else
			node = node->children[1];
	}
}


/*
=============
RotatedBBox

Returns an axially aligned box that contains the input box at the given rotation
=============
*/
void RotatedBBox (vec3_t mins, vec3_t maxs, vec3_t angles,
        vec3_t tmins, vec3_t tmaxs)
{
	vec3_t	tmp, v;
	int		i, j;
	vec3_t	forward, right, up;

	if (!angles[0] && !angles[1] && !angles[2])
	{
		VectorCopy (mins, tmins);
		VectorCopy (maxs, tmaxs);
		return;
	}

	for (i=0 ; i<3 ; i++)
	{
		tmins[i] = 99999;
		tmaxs[i] = -99999;
	}

	AngleVectors (angles, forward, right, up);

	for ( i = 0; i < 8; i++ )
	{
		if ( i & 1 )
			tmp[0] = mins[0];
		else
			tmp[0] = maxs[0];

		if ( i & 2 )
			tmp[1] = mins[1];
		else
			tmp[1] = maxs[1];

		if ( i & 4 )
			tmp[2] = mins[2];
		else
			tmp[2] = maxs[2];


		VectorScale (forward, tmp[0], v);
		VectorMA (v, -tmp[1], right, v);
		VectorMA (v, tmp[2], up, v);

		for (j=0 ; j<3 ; j++)
		{
			if (v[j] < tmins[j])
				tmins[j] = v[j];
			if (v[j] > tmaxs[j])
				tmaxs[j] = v[j];
		}
	}
}

/*
=============
R_DrawBEntitiesOnList
=============
*/
void R_DrawBEntitiesOnList (void)
{
	int			i, clipflags;
	vec3_t		oldorigin;
	vec3_t		mins, maxs;
	float		minmaxs[6];
	mnode_t		*topnode;

	if (!r_drawentities->value)
		return;

	VectorCopy (modelorg, oldorigin);
	insubmodel = qtrue;
	r_dlightframecount = r_framecount;

	for (i=0 ; i<r_newrefdef.num_entities ; i++)
	{
		currententity = &r_newrefdef.entities[i];
		currentmodel = R_ModelForHandle( currententity->model );
		if (!currentmodel)
			continue;
		if (currentmodel->nummodelsurfaces == 0)
			continue;	// clip brush only
		if ( currententity->flags & RF_BEAM )
			continue;
		if (currentmodel->type != mod_brush)
			continue;
	// see if the bounding box lets us trivially reject, also sets
	// trivial accept status
		RotatedBBox (currentmodel->mins, currentmodel->maxs,
			currententity->angles, mins, maxs);
		VectorAdd (mins, currententity->origin, minmaxs);
		VectorAdd (maxs, currententity->origin, (minmaxs+3));

		clipflags = R_BmodelCheckBBox (minmaxs);
		if (clipflags == BMODEL_FULLY_CLIPPED)
			continue;	// off the edge of the screen

		topnode = R_FindTopnode (minmaxs, minmaxs+3);
		if (!topnode)
			continue;	// no part in a visible leaf

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

		r_pcurrentvertbase = currentmodel->vertexes;

	// FIXME: stop transforming twice
		R_RotateBmodel ();

	// calculate dynamic lighting for bmodel
		R_PushDlights (currentmodel);

		if (topnode->contents == CONTENTS_NODE)
		{
		// not a leaf; has to be clipped to the world BSP
			r_clipflags = clipflags;
			R_DrawSolidClippedSubmodelPolygons (currentmodel, topnode);
		}
		else
		{
		// falls entirely in one leaf, so we just put all the
		// edges in the edge list and let 1/z sorting handle
		// drawing order
			R_DrawSubmodelPolygons (currentmodel, clipflags, topnode);
		}

	// put back world rotation and frustum clipping		
	// FIXME: R_RotateBmodel should just work off base_vxx
		VectorCopy (base_vpn, vpn);
		VectorCopy (base_vup, vup);
		VectorCopy (base_vright, vright);
		VectorCopy (oldorigin, modelorg);
		R_TransformFrustum ();
	}

	insubmodel = qfalse;
}


/*
================
R_EdgeDrawing
================
*/
void R_EdgeDrawing (void)
{
	edge_t	ledges[NUMSTACKEDGES +
				((CACHE_SIZE - 1) / sizeof(edge_t)) + 1];
	surf_t	lsurfs[NUMSTACKSURFACES +
				((CACHE_SIZE - 1) / sizeof(surf_t)) + 1];

	if ( r_newrefdef.rdflags & RDF_NOWORLDMODEL )
		return;

	if (auxedges)
	{
		r_edges = auxedges;
	}
	else
	{
		r_edges =  (edge_t *)
				(((long)&ledges[0] + CACHE_SIZE - 1) & ~(CACHE_SIZE - 1));
	}

	if (r_surfsonstack)
	{
		surfaces =  (surf_t *)
				(((long)&lsurfs[0] + CACHE_SIZE - 1) & ~(CACHE_SIZE - 1));
		surf_max = &surfaces[r_cnumsurfs];
	// surface 0 doesn't really exist; it's just a dummy because index 0
	// is used to indicate no edge attached to surface
		surfaces--;
		R_SurfacePatch ();
	}

	R_BeginEdgeFrame ();

	if (r_dspeeds->integer)
	{
		rw_time1 = sys.Milliseconds ();
	}

	R_RenderWorld ();

	if (r_dspeeds->integer)
	{
		rw_time2 = sys.Milliseconds ();
		db_time1 = rw_time2;
	}

	R_DrawBEntitiesOnList ();

	if (r_dspeeds->integer)
	{
		db_time2 = sys.Milliseconds ();
		se_time1 = db_time2;
	}

	R_ScanEdges ();
}

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


/*
=============
R_CalcPalette

=============
*/
void R_CalcPalette (void)
{
	static qboolean modified;
	byte	palette[256*4], *in, *out;
	int		i;
	float	alpha, one_minus_alpha;
	vec3_t	premult;
	int		r, g, b;

	alpha = r_newrefdef.blend[3];
	if( alpha <= 0 ) {
		if (modified) {
			// set back to default
			modified = qfalse;
			R_GammaCorrectAndSetPalette( ( const byte * ) d_8to24table );
		}
		return;
	}

	modified = qtrue;
	if (alpha > 1)
		alpha = 1;

	premult[0] = r_newrefdef.blend[0]*alpha*255;
	premult[1] = r_newrefdef.blend[1]*alpha*255;
	premult[2] = r_newrefdef.blend[2]*alpha*255;

	one_minus_alpha = (1.0 - alpha);

	in = ( byte * )d_8to24table;
	out = palette;
	for( i = 0; i < 256; i++, in += 4, out += 4 ) {
		r = premult[0] + one_minus_alpha * in[0];
		g = premult[1] + one_minus_alpha * in[1];
		b = premult[2] + one_minus_alpha * in[2];
		if ( r > 255 ) r = 255;
		if ( g > 255 ) g = 255;
		if ( b > 255 ) b = 255;
		out[0] = r;
		out[1] = g;
		out[2] = b;
		out[3] = 255;
	}

	R_GammaCorrectAndSetPalette( palette );
}

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

/*
@@@@@@@@@@@@@@@@
R_RenderFrame

@@@@@@@@@@@@@@@@
*/
void R_RenderFrame (refdef_t *fd)
{
	r_newrefdef = *fd;

	if (!r_worldmodel && !( r_newrefdef.rdflags & RDF_NOWORLDMODEL ) )
		Com_Error (ERR_FATAL,"R_RenderView: NULL worldmodel");

	VectorCopy (fd->vieworg, r_refdef.vieworg);
	VectorCopy (fd->viewangles, r_refdef.viewangles);

	if (r_speeds->integer || r_dspeeds->integer)
		r_time1 = sys.Milliseconds ();

	R_SetupFrame ();

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

	R_PushDlights (r_worldmodel);

	R_EdgeDrawing ();

	if (r_dspeeds->integer)
	{
		se_time2 = sys.Milliseconds ();
		de_time1 = se_time2;
	}

	R_DrawEntitiesOnList ();

	if (r_dspeeds->integer)
	{
		de_time2 = sys.Milliseconds ();
		dp_time1 = sys.Milliseconds ();
	}

	R_DrawParticles ();

	if (r_dspeeds->integer)
		dp_time2 = sys.Milliseconds ();

	R_DrawAlphaSurfaces();

	//Start Replaced by Lewey
	if( sw_drawsird->integer && !( r_newrefdef.rdflags & RDF_NOWORLDMODEL ) )
	{
		R_ApplySIRDAlgorithum();
	}
	else
	{
		//don't do warp if we are doing SIRD because the warp
		//would make the SIRD impossible to see.
		if (r_dowarp)
			D_WarpScreen ();
	}
	//End Replaced by Lewey

	if (r_dspeeds->integer)
		da_time1 = sys.Milliseconds ();

	if (r_dspeeds->integer)
		da_time2 = sys.Milliseconds ();

	R_CalcPalette ();

	if (sw_aliasstats->integer)
		R_PrintAliasStats ();
		
	if (r_speeds->integer)
		R_PrintTimes ();

	if (r_dspeeds->integer)
		R_PrintDSpeeds ();

	if (sw_reportsurfout->integer && r_outofsurfaces)
		Com_Printf("Short %d surfaces\n", r_outofsurfaces);

	if (sw_reportedgeout->integer && r_outofedges)
		Com_Printf("Short roughly %d edges\n", r_outofedges * 2 / 3);
}

/*
** R_BeginFrame
*/
void R_BeginFrame( void ) {
	vidsw.BeginFrame();
}

void R_EndFrame( void ) {
	 vidsw.EndFrame();
}

/*
** R_GammaCorrectAndSetPalette
*/
void R_GammaCorrectAndSetPalette( const byte *palette ) {
	int i;
	byte *dest;

	dest = sw_state.currentpalette;
	for( i = 0; i < 256; i++ ) {
		dest[0] = sw_state.gammatable[ palette[0] ];
		dest[1] = sw_state.gammatable[ palette[1] ];
		dest[2] = sw_state.gammatable[ palette[2] ];
		palette += 4; dest += 4;
	}

	vidsw.UpdatePalette( sw_state.currentpalette );
}

/*
** R_CinematicSetPalette
*/
void R_CinematicSetPalette( const byte *palette )
{
	byte palette32[1024];
	int		i, j, w;
	int		*d;

	// clear screen to black to avoid any palette flash
	w = abs(vid.rowbytes)>>2;	// stupid negative pitch win32 stuff...
	for (i=0 ; i<vid.height ; i++, d+=w)
	{
		d = (int *)(vid.buffer + i*vid.rowbytes);
		for (j=0 ; j<w ; j++)
			d[j] = 0;
	}
	// flush it to the screen
	R_EndFrame ();

	if ( palette )
	{
		for ( i = 0; i < 256; i++ )
		{
			palette32[i*4+0] = palette[i*3+0];
			palette32[i*4+1] = palette[i*3+1];
			palette32[i*4+2] = palette[i*3+2];
			palette32[i*4+3] = 0xFF;
		}

		R_GammaCorrectAndSetPalette( palette32 );
	}
	else
	{
		R_GammaCorrectAndSetPalette( ( const byte * ) d_8to24table );
	}
}


/*
** R_DrawBeam
*/
void R_DrawBeam( entity_t *e )
{
#define NUM_BEAM_SEGS 6

	int	i;

	vec3_t perpvec;
	vec3_t direction, normalized_direction;
	vec3_t start_points[NUM_BEAM_SEGS], end_points[NUM_BEAM_SEGS];
	vec3_t oldorigin, origin;

	oldorigin[0] = e->oldorigin[0];
	oldorigin[1] = e->oldorigin[1];
	oldorigin[2] = e->oldorigin[2];

	origin[0] = e->origin[0];
	origin[1] = e->origin[1];
	origin[2] = e->origin[2];

	normalized_direction[0] = direction[0] = oldorigin[0] - origin[0];
	normalized_direction[1] = direction[1] = oldorigin[1] - origin[1];
	normalized_direction[2] = direction[2] = oldorigin[2] - origin[2];

	if ( VectorNormalize( normalized_direction ) == 0 )
		return;

	PerpendicularVector( perpvec, normalized_direction );
	VectorScale( perpvec, e->frame / 2, perpvec );

	for ( i = 0; i < NUM_BEAM_SEGS; i++ )
	{
		RotatePointAroundVector( start_points[i], normalized_direction,
                perpvec, (360.0/NUM_BEAM_SEGS)*i );
		VectorAdd( start_points[i], origin, start_points[i] );
		VectorAdd( start_points[i], direction, end_points[i] );
	}

	for ( i = 0; i < NUM_BEAM_SEGS; i++ )
	{
		R_IMFlatShadedQuad( start_points[i],
		                    end_points[i],
							end_points[(i+1)%NUM_BEAM_SEGS],
							start_points[(i+1)%NUM_BEAM_SEGS],
							e->skinnum & 0xFF,
							e->alpha );
	}
}



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

/*
============
R_SetSky
============
*/
extern	mtexinfo_t		r_skytexinfo[6];

void R_SetSky( const char *name, float rotate, vec3_t axis ) {
    // 3dstudio environment map names
    static const char	suf[6][3] = {"rt", "bk", "lf", "ft", "up", "dn"};
    static const int	r_skysideimage[6] = {5, 2, 4, 1, 0, 3};
	int		i;
	char	pathname[MAX_QPATH];

	strncpy (skyname, name, sizeof(skyname)-1);
	skyrotate = rotate;
	VectorCopy (axis, skyaxis);

	for (i=0 ; i<6 ; i++)
	{
		Q_concat( pathname, sizeof( pathname ),
            "env/", skyname, suf[r_skysideimage[i]], ".pcx", NULL );
		r_skytexinfo[i].image = R_FindImage (pathname, it_sky);
	}
}




/*
=================
R_GetModelSize
=================
*/
void R_GetModelSize( qhandle_t hModel, vec3_t mins, vec3_t maxs ) {
	model_t *mod;

	mod = R_ModelForHandle( hModel );
	if( !mod ) {
		return;
	}

	if( mins ) {
		VectorCopy( mod->mins, mins );
	}
	if( maxs ) {
		VectorCopy( mod->maxs, maxs );
	}
}

void R_GetConfig( glconfig_t *dest ) {
	memset( dest, 0, sizeof( *dest ) );

	dest->renderer = GL_RENDERER_SOFTWARE;
	dest->vidWidth = vid.width;
	dest->vidHeight = vid.height;
}

#ifndef REF_HARD_LINKED

// this is only here so the functions in q_shared.c can link

void Com_Printf( const char *fmt, ... ) {
	va_list		argptr;
	char		text[MAXPRINTMSG];

	va_start( argptr, fmt );
	Q_vsnprintf( text, sizeof( text ), fmt, argptr );
	va_end( argptr );

	com.Print( PRINT_ALL, text );
}

void Com_DPrintf( const char *fmt, ... ) {
	va_list		argptr;
	char		text[MAXPRINTMSG];

	va_start( argptr, fmt );
	Q_vsnprintf( text, sizeof( text ), fmt, argptr );
	va_end( argptr );

	com.Print( PRINT_DEVELOPER, text );
}

void Com_WPrintf( const char *fmt, ... ) {
	va_list		argptr;
	char		text[MAXPRINTMSG];

	va_start( argptr, fmt );
	Q_vsnprintf( text, sizeof( text ), fmt, argptr );
	va_end( argptr );

	com.Print( PRINT_WARNING, text );
}

void Com_EPrintf( const char *fmt, ... ) {
	va_list		argptr;
	char		text[MAXPRINTMSG];

	va_start( argptr, fmt );
	Q_vsnprintf( text, sizeof( text ), fmt, argptr );
	va_end( argptr );

	com.Print( PRINT_ERROR, text );
}

void Com_Error( comErrorType_t type, const char *error, ... ) {
	va_list		argptr;
	char		text[MAXPRINTMSG];

	va_start( argptr, error );
	Q_vsnprintf( text, sizeof( text ), error, argptr );
	va_end( argptr );

	com.Error( type, text );
}

#endif

void		R_BeginRegistration( const char *model );
qhandle_t	R_RegisterSkin( const char *name );
qhandle_t	R_RegisterModel( const char *name );
qhandle_t	R_RegisterPic( const char *name );
qhandle_t	R_RegisterFont( const char *name );
void		R_EndRegistration( void );

void Draw_SetScale( float *scale ) {
	if( scale ) {
		*scale = 1;
	}
}

void    Draw_SetColor( int flags, const color_t color );
void    Draw_SetClipRect( int flags, const clipRect_t *clip );
void	Draw_GetPicSize( int *w, int *h, qhandle_t hPic );
void	Draw_GetFontSize( int *w, int *h, qhandle_t hFont );
void	Draw_Pic( int x, int y, qhandle_t hPic );
void	Draw_StretchPic( int x, int y, int w, int h, qhandle_t hPic );
void	Draw_StretchPicST( int x, int y, int w, int h, float s1, float t1,
            float s2, float t2, qhandle_t hPic );
void	Draw_TileClear( int x, int y, int w, int h, qhandle_t hPic );
void	Draw_Fill( int x, int y, int w, int h, int c );
void	Draw_FillEx( int x, int y, int w, int h, const color_t color );
void	Draw_StretchRaw( int x, int y, int w, int h, int cols,
            int rows, const byte *data );
void    Draw_Char( int x, int y, int flags, int ch, qhandle_t hFont );
int 	Draw_String( int x, int y, int flags, size_t maxChars,
            const char *string, qhandle_t hFont );

/*
=================
Ref_FillAPI
=================
*/
static void Ref_FillAPI( refAPI_t *api ) {
	api->BeginRegistration = R_BeginRegistration;
	api->RegisterModel = R_RegisterModel;
	api->RegisterSkin = R_RegisterSkin;
	api->RegisterPic = R_RegisterPic;
	api->RegisterFont = R_RegisterFont;
	api->SetSky = R_SetSky;
	api->EndRegistration = R_EndRegistration;
	api->GetModelSize = R_GetModelSize;

	api->RenderFrame = R_RenderFrame;
	api->LightPoint = R_LightPoint;

    api->SetColor = Draw_SetColor;
    api->SetClipRect = Draw_SetClipRect;
	api->SetScale = Draw_SetScale;
	api->DrawGetPicSize = Draw_GetPicSize;
	api->DrawGetFontSize = Draw_GetFontSize;
	api->DrawPic = Draw_Pic;
	api->DrawStretchPic = Draw_StretchPic;
	api->DrawStretchPicST = Draw_StretchPicST;
	api->DrawTileClear = Draw_TileClear;
	api->DrawFill = Draw_Fill;
	api->DrawStretchRaw = Draw_StretchRaw;
	api->DrawChar  = Draw_Char;
	api->DrawString  = Draw_String;

	api->DrawFillEx = Draw_FillEx;

	api->Init = R_Init;
	api->Shutdown = R_Shutdown;

	api->CinematicSetPalette = R_CinematicSetPalette;
	api->BeginFrame = R_BeginFrame;
	api->EndFrame = R_EndFrame;
    api->ModeChanged = R_ModeChanged;

	api->GetConfig = R_GetConfig;

}

/*
=================
Ref_APISetupCallback
=================
*/
qboolean Ref_APISetupCallback( api_type_t type, void *api ) {
	switch( type ) {
	case API_REFRESH:
		Ref_FillAPI( ( refAPI_t * )api );
		break;
	default:
		/* not supported API type */
		return qfalse;
	}

	return qtrue;
}

#ifndef REF_HARD_LINKED

/*
@@@@@@@@@@@@@@@@@@@@@
moduleEntry

@@@@@@@@@@@@@@@@@@@@@
*/
EXPORTED void *moduleEntry( int query, void *data ) {
	moduleInfo_t *info;
	moduleCapability_t caps;
	APISetupCallback_t callback;

	switch( query ) {
	case MQ_GETINFO:
		info = ( moduleInfo_t * )data;
		info->api_version = MODULES_APIVERSION;
		Q_strncpyz( info->fullname, "Software Refresh Driver",
                sizeof( info->fullname ) );
		Q_strncpyz( info->author, "ID Software, Inc", sizeof( info->author ) );
		return ( void * )qtrue;

	case MQ_GETCAPS:
		caps = MCP_REFRESH;
		return ( void * )caps;

	case MQ_SETUPAPI:
		if( ( callback = ( APISetupCallback_t )data ) == NULL ) {
			return NULL;
		}
		callback( API_CMD, &cmd );
		callback( API_CVAR, &cvar );
		callback( API_FS, &fs );
		callback( API_COMMON, &com );
		callback( API_SYSTEM, &sys );
		callback( API_VIDEO_SOFTWARE, &vidsw );

		return ( void * )Ref_APISetupCallback;

	}

	/* quiet compiler warning */
	return NULL;
}

#endif