diff options
Diffstat (limited to 'demos/3rdparty/doom/r_plane.c')
| -rw-r--r-- | demos/3rdparty/doom/r_plane.c | 453 |
1 files changed, 0 insertions, 453 deletions
diff --git a/demos/3rdparty/doom/r_plane.c b/demos/3rdparty/doom/r_plane.c deleted file mode 100644 index f6ac8e22..00000000 --- a/demos/3rdparty/doom/r_plane.c +++ /dev/null @@ -1,453 +0,0 @@ -// Emacs style mode select -*- C++ -*- -//----------------------------------------------------------------------------- -// -// $Id:$ -// -// Copyright (C) 1993-1996 by id Software, Inc. -// -// This source is available for distribution and/or modification -// only under the terms of the DOOM Source Code License as -// published by id Software. All rights reserved. -// -// The source is distributed in the hope that it will be useful, -// but WITHOUT ANY WARRANTY; without even the implied warranty of -// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License -// for more details. -// -// $Log:$ -// -// DESCRIPTION: -// Here is a core component: drawing the floors and ceilings, -// while maintaining a per column clipping list only. -// Moreover, the sky areas have to be determined. -// -//----------------------------------------------------------------------------- - - -static const char -rcsid[] = "$Id: r_plane.c,v 1.4 1997/02/03 16:47:55 b1 Exp $"; - -#include <stdlib.h> - -#include "i_system.h" -#include "z_zone.h" -#include "w_wad.h" - -#include "doomdef.h" -#include "doomstat.h" - -#include "r_local.h" -#include "r_sky.h" - - - -planefunction_t floorfunc; -planefunction_t ceilingfunc; - -// -// opening -// - -// Here comes the obnoxious "visplane". -#define MAXVISPLANES 128 -visplane_t visplanes[MAXVISPLANES]; -visplane_t* lastvisplane; -visplane_t* floorplane; -visplane_t* ceilingplane; - -// ? -#define MAXOPENINGS SCREENWIDTH*64 -short openings[MAXOPENINGS]; -short* lastopening; - - -// -// Clip values are the solid pixel bounding the range. -// floorclip starts out SCREENHEIGHT -// ceilingclip starts out -1 -// -short floorclip[SCREENWIDTH]; -short ceilingclip[SCREENWIDTH]; - -// -// spanstart holds the start of a plane span -// initialized to 0 at start -// -int spanstart[SCREENHEIGHT]; -int spanstop[SCREENHEIGHT]; - -// -// texture mapping -// -lighttable_t** planezlight; -fixed_t planeheight; - -fixed_t yslope[SCREENHEIGHT]; -fixed_t distscale[SCREENWIDTH]; -fixed_t basexscale; -fixed_t baseyscale; - -fixed_t cachedheight[SCREENHEIGHT]; -fixed_t cacheddistance[SCREENHEIGHT]; -fixed_t cachedxstep[SCREENHEIGHT]; -fixed_t cachedystep[SCREENHEIGHT]; - - - -// -// R_InitPlanes -// Only at game startup. -// -void R_InitPlanes (void) -{ - // Doh! -} - - -// -// R_MapPlane -// -// Uses global vars: -// planeheight -// ds_source -// basexscale -// baseyscale -// viewx -// viewy -// -// BASIC PRIMITIVE -// -void -R_MapPlane -( int y, - int x1, - int x2 ) -{ - angle_t angle; - fixed_t distance; - fixed_t length; - unsigned index; - -#ifdef RANGECHECK - if (x2 < x1 - || x1<0 - || x2>=viewwidth - || (unsigned)y>viewheight) - { - I_Error ("R_MapPlane: %i, %i at %i",x1,x2,y); - } -#endif - - if (planeheight != cachedheight[y]) - { - cachedheight[y] = planeheight; - distance = cacheddistance[y] = FixedMul (planeheight, yslope[y]); - ds_xstep = cachedxstep[y] = FixedMul (distance,basexscale); - ds_ystep = cachedystep[y] = FixedMul (distance,baseyscale); - } - else - { - distance = cacheddistance[y]; - ds_xstep = cachedxstep[y]; - ds_ystep = cachedystep[y]; - } - - length = FixedMul (distance,distscale[x1]); - angle = (viewangle + xtoviewangle[x1])>>ANGLETOFINESHIFT; - ds_xfrac = viewx + FixedMul(finecosine[angle], length); - ds_yfrac = -viewy - FixedMul(finesine[angle], length); - - if (fixedcolormap) - ds_colormap = fixedcolormap; - else - { - index = distance >> LIGHTZSHIFT; - - if (index >= MAXLIGHTZ ) - index = MAXLIGHTZ-1; - - ds_colormap = planezlight[index]; - } - - ds_y = y; - ds_x1 = x1; - ds_x2 = x2; - - // high or low detail - spanfunc (); -} - - -// -// R_ClearPlanes -// At begining of frame. -// -void R_ClearPlanes (void) -{ - int i; - angle_t angle; - - // opening / clipping determination - for (i=0 ; i<viewwidth ; i++) - { - floorclip[i] = viewheight; - ceilingclip[i] = -1; - } - - lastvisplane = visplanes; - lastopening = openings; - - // texture calculation - memset (cachedheight, 0, sizeof(cachedheight)); - - // left to right mapping - angle = (viewangle-ANG90)>>ANGLETOFINESHIFT; - - // scale will be unit scale at SCREENWIDTH/2 distance - basexscale = FixedDiv (finecosine[angle],centerxfrac); - baseyscale = -FixedDiv (finesine[angle],centerxfrac); -} - - - - -// -// R_FindPlane -// -visplane_t* -R_FindPlane -( fixed_t height, - int picnum, - int lightlevel ) -{ - visplane_t* check; - - if (picnum == skyflatnum) - { - height = 0; // all skys map together - lightlevel = 0; - } - - for (check=visplanes; check<lastvisplane; check++) - { - if (height == check->height - && picnum == check->picnum - && lightlevel == check->lightlevel) - { - break; - } - } - - - if (check < lastvisplane) - return check; - - if (lastvisplane - visplanes == MAXVISPLANES) - I_Error ("R_FindPlane: no more visplanes"); - - lastvisplane++; - - check->height = height; - check->picnum = picnum; - check->lightlevel = lightlevel; - check->minx = SCREENWIDTH; - check->maxx = -1; - - memset (check->top,0xff,sizeof(check->top)); - - return check; -} - - -// -// R_CheckPlane -// -visplane_t* -R_CheckPlane -( visplane_t* pl, - int start, - int stop ) -{ - int intrl; - int intrh; - int unionl; - int unionh; - int x; - - if (start < pl->minx) - { - intrl = pl->minx; - unionl = start; - } - else - { - unionl = pl->minx; - intrl = start; - } - - if (stop > pl->maxx) - { - intrh = pl->maxx; - unionh = stop; - } - else - { - unionh = pl->maxx; - intrh = stop; - } - - for (x=intrl ; x<= intrh ; x++) - if (pl->top[x] != 0xff) - break; - - if (x > intrh) - { - pl->minx = unionl; - pl->maxx = unionh; - - // use the same one - return pl; - } - - // make a new visplane - lastvisplane->height = pl->height; - lastvisplane->picnum = pl->picnum; - lastvisplane->lightlevel = pl->lightlevel; - - pl = lastvisplane++; - pl->minx = start; - pl->maxx = stop; - - memset (pl->top,0xff,sizeof(pl->top)); - - return pl; -} - - -// -// R_MakeSpans -// -void -R_MakeSpans -( int x, - int t1, - int b1, - int t2, - int b2 ) -{ - while (t1 < t2 && t1<=b1) - { - R_MapPlane (t1,spanstart[t1],x-1); - t1++; - } - while (b1 > b2 && b1>=t1) - { - R_MapPlane (b1,spanstart[b1],x-1); - b1--; - } - - while (t2 < t1 && t2<=b2) - { - spanstart[t2] = x; - t2++; - } - while (b2 > b1 && b2>=t2) - { - spanstart[b2] = x; - b2--; - } -} - - - -// -// R_DrawPlanes -// At the end of each frame. -// -void R_DrawPlanes (void) -{ - visplane_t* pl; - int light; - int x; - int stop; - int angle; - -#ifdef RANGECHECK - if (ds_p - drawsegs > MAXDRAWSEGS) - I_Error ("R_DrawPlanes: drawsegs overflow (%i)", - ds_p - drawsegs); - - if (lastvisplane - visplanes > MAXVISPLANES) - I_Error ("R_DrawPlanes: visplane overflow (%i)", - lastvisplane - visplanes); - - if (lastopening - openings > MAXOPENINGS) - I_Error ("R_DrawPlanes: opening overflow (%i)", - lastopening - openings); -#endif - - for (pl = visplanes ; pl < lastvisplane ; pl++) - { - if (pl->minx > pl->maxx) - continue; - - - // sky flat - if (pl->picnum == skyflatnum) - { - dc_iscale = pspriteiscale>>detailshift; - - // Sky is allways drawn full bright, - // i.e. colormaps[0] is used. - // Because of this hack, sky is not affected - // by INVUL inverse mapping. - dc_colormap = colormaps; - dc_texturemid = skytexturemid; - for (x=pl->minx ; x <= pl->maxx ; x++) - { - dc_yl = pl->top[x]; - dc_yh = pl->bottom[x]; - - if (dc_yl <= dc_yh) - { - angle = (viewangle + xtoviewangle[x])>>ANGLETOSKYSHIFT; - dc_x = x; - dc_source = R_GetColumn(skytexture, angle); - colfunc (); - } - } - continue; - } - - // regular flat - ds_source = W_CacheLumpNum(firstflat + - flattranslation[pl->picnum], - PU_STATIC); - - planeheight = abs(pl->height-viewz); - light = (pl->lightlevel >> LIGHTSEGSHIFT)+extralight; - - if (light >= LIGHTLEVELS) - light = LIGHTLEVELS-1; - - if (light < 0) - light = 0; - - planezlight = zlight[light]; - - pl->top[pl->maxx+1] = 0xff; - pl->top[pl->minx-1] = 0xff; - - stop = pl->maxx + 1; - - for (x=pl->minx ; x<= stop ; x++) - { - R_MakeSpans(x,pl->top[x-1], - pl->bottom[x-1], - pl->top[x], - pl->bottom[x]); - } - - Z_ChangeTag (ds_source, PU_CACHE); - } -} |