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xash3d-fwgs/ref/soft/r_misc.c

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/*
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
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};
//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];
struct qfrustum_s qfrustum;
/*
================
D_Patch
================
*/
static 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
================
*/
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 = gpGlobals->width / 320;
if (d_pix_min < 1)
d_pix_min = 1;
d_pix_max = (int)((float)gpGlobals->height / (320.0 / 4.0) + 0.5);
d_pix_shift = 8 - (int)((float)gpGlobals->height / 320.0 + 0.5);
if (d_pix_max < 1)
d_pix_max = 1;*/
//d_vrectx = RI.vrect.x;
//d_vrecty = RI.vrect.y;
//d_vrectright_particle = gpGlobals->width - d_pix_max;
//d_vrectbottom_particle =
// gpGlobals->height - 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 ( !RI.drawWorld )
{
memset( d_pzbuffer, 0xff, vid.width * vid.height * sizeof( d_pzbuffer[0] ) );
}
D_Patch ();
}
/*
===================
R_TransformFrustum
===================
*/
void R_TransformFrustum (void)
{
int i;
vec3_t v, v2;
for (i=0 ; i<4 ; i++)
{
v[0] = qfrustum.screenedge[i].normal[2];
v[1] = -qfrustum.screenedge[i].normal[0];
v[2] = qfrustum.screenedge[i].normal[1];
v2[0] = v[1]*RI.vright[0] + v[2]*RI.vup[0] + v[0]*RI.vforward[0];
v2[1] = v[1]*RI.vright[1] + v[2]*RI.vup[1] + v[0]*RI.vforward[1];
v2[2] = v[1]*RI.vright[2] + v[2]*RI.vup[2] + v[0]*RI.vforward[2];
VectorCopy (v2, qfrustum.view_clipplanes[i].normal);
qfrustum.view_clipplanes[i].dist = DotProduct (tr.modelorg, v2);
}
}
/*
================
TransformVector
================
*/
void TransformVector (vec3_t in, vec3_t out)
{
out[0] = DotProduct(in,RI.vright);
out[1] = DotProduct(in,RI.vup);
out[2] = DotProduct(in,RI.vforward);
}
/*
===============
R_SetUpFrustumIndexes
===============
*/
static void R_SetUpFrustumIndexes (void)
{
int i, j, *pindex;
pindex = qfrustum.frustum_indexes;
for (i=0 ; i<4 ; i++)
{
for (j=0 ; j<3 ; j++)
{
if (qfrustum.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
qfrustum.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
===============
*/
static void R_ViewChanged (vrect_t *vr)
{
int i;
float verticalFieldOfView, horizontalFieldOfView, xOrigin, yOrigin;
RI.vrect = *vr;
horizontalFieldOfView = 2*tan((float)RI.fov_x/360.0f * M_PI_F);
verticalFieldOfView = 2*tan((float)RI.fov_y/360.0f * M_PI_F);
RI.fvrectx = (float)RI.vrect.x;
RI.fvrectx_adj = (float)RI.vrect.x - 0.5f;
RI.vrect_x_adj_shift20 = (RI.vrect.x<<20) + (1<<19) - 1;
RI.fvrecty = (float)RI.vrect.y;
RI.fvrecty_adj = (float)RI.vrect.y - 0.5f;
RI.vrectright = RI.vrect.x + RI.vrect.width;
RI.vrectright_adj_shift20 = (RI.vrectright<<20) + (1<<19) - 1;
RI.fvrectright = (float)RI.vrectright;
RI.fvrectright_adj = (float)RI.vrectright - 0.5f;
RI.vrectrightedge = (float)RI.vrectright - 0.99f;
RI.vrectbottom = RI.vrect.y + RI.vrect.height;
RI.fvrectbottom = (float)RI.vrectbottom;
RI.fvrectbottom_adj = (float)RI.vrectbottom - 0.5f;
RI.aliasvrect.x = (int)(RI.vrect.x * r_aliasuvscale);
RI.aliasvrect.y = (int)(RI.vrect.y * r_aliasuvscale);
RI.aliasvrect.width = (int)(RI.vrect.width * r_aliasuvscale);
RI.aliasvrect.height = (int)(RI.vrect.height * r_aliasuvscale);
RI.aliasvrectright = RI.aliasvrect.x +
RI.aliasvrect.width;
RI.aliasvrectbottom = RI.aliasvrect.y +
RI.aliasvrect.height;
xOrigin = XCENTERING;
yOrigin = YCENTERING;
#define PLANE_ANYZ 5
// values for perspective projection
// if math were exact, the values would range from 0.5 to to range+0.5
// hopefully they wll be in the 0.000001 to range+.999999 and truncate
// the polygon rasterization will never render in the first row or column
// but will definately render in the [range] row and column, so adjust the
// buffer origin to get an exact edge to edge fill
xcenter = ((float)RI.vrect.width * XCENTERING) +
RI.vrect.x - 0.5f;
aliasxcenter = xcenter * r_aliasuvscale;
ycenter = ((float)RI.vrect.height * YCENTERING) +
RI.vrect.y - 0.5f;
aliasycenter = ycenter * r_aliasuvscale;
xscale = RI.vrect.width / horizontalFieldOfView;
aliasxscale = xscale * r_aliasuvscale;
xscaleinv = 1.0f / xscale;
yscale = xscale;
aliasyscale = yscale * r_aliasuvscale;
yscaleinv = 1.0f / yscale;
//xscaleshrink = (RI.vrect.width-6)/RI.horizontalFieldOfView;
//yscaleshrink = xscaleshrink;
// left side clip
qfrustum.screenedge[0].normal[0] = -1.0f / (xOrigin*horizontalFieldOfView);
qfrustum.screenedge[0].normal[1] = 0;
qfrustum.screenedge[0].normal[2] = 1;
qfrustum.screenedge[0].type = PLANE_ANYZ;
// right side clip
qfrustum.screenedge[1].normal[0] =
1.0f / ((1.0f-xOrigin)*horizontalFieldOfView);
qfrustum.screenedge[1].normal[1] = 0;
qfrustum.screenedge[1].normal[2] = 1;
qfrustum.screenedge[1].type = PLANE_ANYZ;
// top side clip
qfrustum.screenedge[2].normal[0] = 0;
qfrustum.screenedge[2].normal[1] = -1.0f / (yOrigin*verticalFieldOfView);
qfrustum.screenedge[2].normal[2] = 1;
qfrustum.screenedge[2].type = PLANE_ANYZ;
// bottom side clip
qfrustum.screenedge[3].normal[0] = 0;
qfrustum.screenedge[3].normal[1] = 1.0f / ((1.0f-yOrigin)*verticalFieldOfView);
qfrustum.screenedge[3].normal[2] = 1;
qfrustum.screenedge[3].type = PLANE_ANYZ;
for (i=0 ; i<4 ; i++)
VectorNormalize (qfrustum.screenedge[i].normal);
D_ViewChanged ();
}
/*
===============
R_SetupFrame
===============
*/
void R_SetupFrameQ (void)
{
int i;
vrect_t vrect;
if (r_fullbright->flags & FCVAR_CHANGED)
{
r_fullbright->flags &= ~FCVAR_CHANGED;
D_FlushCaches( ); // so all lighting changes
}
//tr.framecount++;
// build the transformation matrix for the given view angles
VectorCopy (RI.vieworg, tr.modelorg);
//AngleVectors (RI.viewangles, RI.vforward, RI.vright, RI.vup);
// current viewleaf
if ( RI.drawWorld )
{
RI.viewleaf = gEngfuncs.Mod_PointInLeaf (RI.vieworg, WORLDMODEL->nodes);
r_viewcluster = RI.viewleaf->cluster;
}
// if (sw_waterwarp->value && (r_newrefdef.rdflags & RDF_UNDERWATER) )
// r_dowarp = true;
// else
/*vrect.x = 0;//r_newrefdef.x;
vrect.y = 0;//r_newrefdef.y;
vrect.width = gpGlobals->width;
vrect.height = gpGlobals->height;*/
vrect.x = RI.viewport[0];
vrect.y = RI.viewport[1];
vrect.width = RI.viewport[2];
vrect.height = RI.viewport[3];
d_viewbuffer = (void *)vid.buffer;
r_screenwidth = vid.rowbytes;
R_ViewChanged (&vrect);
// start off with just the four screen edge clip planes
R_TransformFrustum ();
R_SetUpFrustumIndexes ();
// save base values
VectorCopy (RI.vforward, RI.base_vpn);
VectorCopy (RI.vright, RI.base_vright);
VectorCopy (RI.vup, RI.base_vup);
// clear frame counts
/* c_faceclip = 0;
d_spanpixcount = 0;
r_polycount = 0;
r_drawnpolycount = 0;
r_wholepolycount = 0;
r_amodels_drawn = 0;
r_outofsurfaces = 0;
r_outofedges = 0;*/
// d_setup
d_roverwrapped = false;
d_initial_rover = sc_rover;
d_minmip = sw_mipcap.value;
if (d_minmip > 3)
d_minmip = 3;
else if (d_minmip < 0)
d_minmip = 0;
for (i=0 ; i<(NUM_MIPS-1) ; i++)
d_scalemip[i] = basemip[i] * sw_mipscale.value;
//d_aflatcolor = 0;
}
#if !id386
/*
================
R_SurfacePatch
================
*/
/*void R_SurfacePatch (void)
{
// we only patch code on Intel
}
*/
#endif // !id386
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