r_misc.c

Quake 2 Source code for students by Theerthan You can also download from idsoftwares.com

/*
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_misc.c

#include "r_local.h"

#define NUM_MIPS	4

cvar_t	*sw_mipcap;
cvar_t	*sw_mipscale;

surfcache_t		*d_initial_rover;
qboolean		d_roverwrapped;
int				d_minmip;
float			d_scalemip[NUM_MIPS-1];

static float	basemip[NUM_MIPS-1] = {1.0, 0.5*0.8, 0.25*0.8};

extern int			d_aflatcolor;

int	d_vrectx, d_vrecty, d_vrectright_particle, d_vrectbottom_particle;

int	d_pix_min, d_pix_max, d_pix_shift;

int		d_scantable[MAXHEIGHT];
short	*zspantable[MAXHEIGHT]; 

/*
================
D_Patch
================
*/
void D_Patch (void)
{
#if id386
	extern void D_Aff8Patch( void );
	static qboolean protectset8 = false;
	extern void D_PolysetAff8Start( void );

	if (!protectset8)
	{
		Sys_MakeCodeWriteable ((int)D_PolysetAff8Start,
						     (int)D_Aff8Patch - (int)D_PolysetAff8Start);
		Sys_MakeCodeWriteable ((long)R_Surf8Start,
						 (long)R_Surf8End - (long)R_Surf8Start);
		protectset8 = true;
	}
	colormap = vid.colormap;

	R_Surf8Patch ();
	D_Aff8Patch();
#endif
}
/*
================
D_ViewChanged
================
*/
unsigned char *alias_colormap;

void D_ViewChanged (void)
{
	int		i;

	scale_for_mip = xscale;
	if (yscale > xscale)
		scale_for_mip = yscale;

	d_zrowbytes = vid.width * 2;
	d_zwidth = vid.width;

	d_pix_min = r_refdef.vrect.width / 320;
	if (d_pix_min < 1)
		d_pix_min = 1;

	d_pix_max = (int)((float)r_refdef.vrect.width / (320.0 / 4.0) + 0.5);
	d_pix_shift = 8 - (int)((float)r_refdef.vrect.width / 320.0 + 0.5);
	if (d_pix_max < 1)
		d_pix_max = 1;

	d_vrectx = r_refdef.vrect.x;
	d_vrecty = r_refdef.vrect.y;
	d_vrectright_particle = r_refdef.vrectright - d_pix_max;
	d_vrectbottom_particle =
			r_refdef.vrectbottom - d_pix_max;

	for (i=0 ; i<vid.height; i++)
	{
		d_scantable[i] = i*r_screenwidth;
		zspantable[i] = d_pzbuffer + i*d_zwidth;
	}

	/*
	** clear Z-buffer and color-buffers if we're doing the gallery
	*/
	if ( r_newrefdef.rdflags & RDF_NOWORLDMODEL )
	{
		memset( d_pzbuffer, 0xff, vid.width * vid.height * sizeof( d_pzbuffer[0] ) );
		Draw_Fill( r_newrefdef.x, r_newrefdef.y, r_newrefdef.width, r_newrefdef.height,( int ) sw_clearcolor->value & 0xff );
	}

	alias_colormap = vid.colormap;

	D_Patch ();
}



/*
=============
R_PrintTimes
=============
*/
void R_PrintTimes (void)
{
	int		r_time2;
	int		ms;

	r_time2 = Sys_Milliseconds ();

	ms = r_time2 - r_time1;
	
	ri.Con_Printf (PRINT_ALL,"%5i ms %3i/%3i/%3i poly %3i surf\n",
				ms, c_faceclip, r_polycount, r_drawnpolycount, c_surf);
	c_surf = 0;
}


/*
=============
R_PrintDSpeeds
=============
*/
void R_PrintDSpeeds (void)
{
	int	ms, dp_time, r_time2, rw_time, db_time, se_time, de_time, da_time;

	r_time2 = Sys_Milliseconds ();

	da_time = (da_time2 - da_time1);
	dp_time = (dp_time2 - dp_time1);
	rw_time = (rw_time2 - rw_time1);
	db_time = (db_time2 - db_time1);
	se_time = (se_time2 - se_time1);
	de_time = (de_time2 - de_time1);
	ms = (r_time2 - r_time1);

	ri.Con_Printf (PRINT_ALL,"%3i %2ip %2iw %2ib %2is %2ie %2ia\n",
				ms, dp_time, rw_time, db_time, se_time, de_time, da_time);
}


/*
=============
R_PrintAliasStats
=============
*/
void R_PrintAliasStats (void)
{
	ri.Con_Printf (PRINT_ALL,"%3i polygon model drawn\n", r_amodels_drawn);
}



/*
===================
R_TransformFrustum
===================
*/
void R_TransformFrustum (void)
{
	int		i;
	vec3_t	v, v2;
	
	for (i=0 ; i<4 ; i++)
	{
		v[0] = screenedge[i].normal[2];
		v[1] = -screenedge[i].normal[0];
		v[2] = screenedge[i].normal[1];

		v2[0] = v[1]*vright[0] + v[2]*vup[0] + v[0]*vpn[0];
		v2[1] = v[1]*vright[1] + v[2]*vup[1] + v[0]*vpn[1];
		v2[2] = v[1]*vright[2] + v[2]*vup[2] + v[0]*vpn[2];

		VectorCopy (v2, view_clipplanes[i].normal);

		view_clipplanes[i].dist = DotProduct (modelorg, v2);
	}
}


#if !(defined __linux__ && defined __i386__)
#if !id386

/*
================
TransformVector
================
*/
void TransformVector (vec3_t in, vec3_t out)
{
	out[0] = DotProduct(in,vright);
	out[1] = DotProduct(in,vup);
	out[2] = DotProduct(in,vpn);		
}

#else

__declspec( naked ) void TransformVector( vec3_t vin, vec3_t vout )
{
	__asm mov eax, dword ptr [esp+4]
	__asm mov edx, dword ptr [esp+8]

	__asm fld  dword ptr [eax+0]
	__asm fmul dword ptr [vright+0]
	__asm fld  dword ptr [eax+0]
	__asm fmul dword ptr [vup+0]
	__asm fld  dword ptr [eax+0]
	__asm fmul dword ptr [vpn+0]

	__asm fld  dword ptr [eax+4]
	__asm fmul dword ptr [vright+4]
	__asm fld  dword ptr [eax+4]
	__asm fmul dword ptr [vup+4]
	__asm fld  dword ptr [eax+4]
	__asm fmul dword ptr [vpn+4]

	__asm fxch st(2)

	__asm faddp st(5), st(0)
	__asm faddp st(3), st(0)
	__asm faddp st(1), st(0)

	__asm fld  dword ptr [eax+8]
	__asm fmul dword ptr [vright+8]
	__asm fld  dword ptr [eax+8]
	__asm fmul dword ptr [vup+8]
	__asm fld  dword ptr [eax+8]
	__asm fmul dword ptr [vpn+8]

	__asm fxch st(2)

	__asm faddp st(5), st(0)
	__asm faddp st(3), st(0)
	__asm faddp st(1), st(0)

	__asm fstp dword ptr [edx+8]
	__asm fstp dword ptr [edx+4]
	__asm fstp dword ptr [edx+0]

	__asm ret
}

#endif
#endif


/*
================
R_TransformPlane
================
*/
void R_TransformPlane (mplane_t *p, float *normal, float *dist)
{
	float	d;
	
	d = DotProduct (r_origin, p->normal);
	*dist = p->dist - d;
// TODO: when we have rotating entities, this will need to use the view matrix
	TransformVector (p->normal, normal);
}


/*
===============
R_SetUpFrustumIndexes
===============
*/
void R_SetUpFrustumIndexes (void)
{
	int		i, j, *pindex;

	pindex = r_frustum_indexes;

	for (i=0 ; i<4 ; i++)
	{
		for (j=0 ; j<3 ; j++)
		{
			if (view_clipplanes[i].normal[j] < 0)
			{
				pindex[j] = j;
				pindex[j+3] = j+3;
			}
			else
			{
				pindex[j] = j+3;
				pindex[j+3] = j;
			}
		}

	// FIXME: do just once at start
		pfrustum_indexes[i] = pindex;
		pindex += 6;
	}
}

/*
===============
R_ViewChanged

Called every time the vid structure or r_refdef changes.
Guaranteed to be called before the first refresh
===============
*/
void R_ViewChanged (vrect_t *vr)
{
	int		i;

	r_refdef.vrect = *vr;