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- /*
- 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.
-
- */
- // r_surf.c: surface-related refresh code
-
- #include "quakedef.h"
- #include "r_local.h"
-
- drawsurf_t r_drawsurf;
-
- int sourcesstep, blocksize, sourcetstep;
- int lightdelta, lightdeltastep;
- int blockdivshift;
- unsigned blockdivmask;
- void *prowdestbase;
- unsigned char *pbasesource;
- int surfrowbytes; // used by ASM files
- unsigned *r_lightptr;
- int r_stepback;
- int r_lightwidth;
- int r_numhblocks, r_numvblocks;
- unsigned char *r_source, *r_sourcemax;
-
- void R_DrawSurfaceBlock8_mip0 (void);
- void R_DrawSurfaceBlock8_mip1 (void);
- void R_DrawSurfaceBlock8_mip2 (void);
- void R_DrawSurfaceBlock8_mip3 (void);
-
- static void (*surfmiptable[4])(void) = {
- R_DrawSurfaceBlock8_mip0,
- R_DrawSurfaceBlock8_mip1,
- R_DrawSurfaceBlock8_mip2,
- R_DrawSurfaceBlock8_mip3
- };
-
-
-
- unsigned blocklights[18*18];
-
- #if id68k
- extern void R_AddDynamicLights (void);
- #else
- /*
- ===============
- R_AddDynamicLights
- ===============
- */
- void R_AddDynamicLights (void)
- {
- msurface_t *surf;
- int lnum;
- int sd, td;
- float dist, rad, minlight;
- vec3_t impact, local;
- int s, t;
- int i;
- int smax, tmax;
- mtexinfo_t *tex;
-
- surf = r_drawsurf.surf;
- smax = (surf->extents[0]>>4)+1;
- tmax = (surf->extents[1]>>4)+1;
- tex = surf->texinfo;
-
- for (lnum=0 ; lnum<MAX_DLIGHTS ; lnum++)
- {
- if ( !(surf->dlightbits & (1<<lnum) ) )
- continue; // not lit by this light
-
- rad = cl_dlights[lnum].radius;
- dist = DotProduct (cl_dlights[lnum].origin, surf->plane->normal) -
- surf->plane->dist;
- rad -= fabs(dist);
- minlight = cl_dlights[lnum].minlight;
- if (rad < minlight)
- continue;
- minlight = rad - minlight;
-
- for (i=0 ; i<3 ; i++)
- {
- impact[i] = cl_dlights[lnum].origin[i] -
- surf->plane->normal[i]*dist;
- }
-
- local[0] = DotProduct (impact, tex->vecs[0]) + tex->vecs[0][3];
- local[1] = DotProduct (impact, tex->vecs[1]) + tex->vecs[1][3];
-
- local[0] -= surf->texturemins[0];
- local[1] -= surf->texturemins[1];
-
- for (t = 0 ; t<tmax ; t++)
- {
- td = local[1] - t*16;
- if (td < 0)
- td = -td;
- for (s=0 ; s<smax ; s++)
- {
- sd = local[0] - s*16;
- if (sd < 0)
- sd = -sd;
- if (sd > td)
- dist = sd + (td>>1);
- else
- dist = td + (sd>>1);
- if (dist < minlight)
- #ifdef QUAKE2
- {
- unsigned temp;
- temp = (rad - dist)*256;
- i = t*smax + s;
- if (!cl_dlights[lnum].dark)
- blocklights[i] += temp;
- else
- {
- if (blocklights[i] > temp)
- blocklights[i] -= temp;
- else
- blocklights[i] = 0;
- }
- }
- #else
- blocklights[t*smax + s] += (rad - dist)*256;
- #endif
- }
- }
- }
- }
-
- #endif
-
- /*
- ===============
- R_BuildLightMap
-
- Combine and scale multiple lightmaps into the 8.8 format in blocklights
- ===============
- */
- void R_BuildLightMap (void)
- {
- int smax, tmax;
- int t;
- int i, size;
- byte *lightmap;
- unsigned scale;
- int maps;
- msurface_t *surf;
-
- surf = r_drawsurf.surf;
-
- smax = (surf->extents[0]>>4)+1;
- tmax = (surf->extents[1]>>4)+1;
- size = smax*tmax;
- lightmap = surf->samples;
-
- if (r_fullbright.value || !cl.worldmodel->lightdata)
- {
- for (i=0 ; i<size ; i++)
- blocklights[i] = 0;
- return;
- }
-
- // clear to ambient
- for (i=0 ; i<size ; i++)
- blocklights[i] = r_refdef.ambientlight<<8;
-
-
- // add all the lightmaps
- if (lightmap)
- for (maps = 0 ; maps < MAXLIGHTMAPS && surf->styles[maps] != 255 ;
- maps++)
- {
- scale = r_drawsurf.lightadj[maps]; // 8.8 fraction
- for (i=0 ; i<size ; i++)
- blocklights[i] += lightmap[i] * scale;
- lightmap += size; // skip to next lightmap
- }
-
- // add all the dynamic lights
- if (surf->dlightframe == r_framecount)
- R_AddDynamicLights ();
-
- // bound, invert, and shift
- for (i=0 ; i<size ; i++)
- {
- t = (255*256 - (int)blocklights[i]) >> (8 - VID_CBITS);
-
- if (t < (1 << 6))
- t = (1 << 6);
-
- blocklights[i] = t;
- }
- }
-
-
- /*
- ===============
- R_TextureAnimation
-
- Returns the proper texture for a given time and base texture
- ===============
- */
- texture_t *R_TextureAnimation (texture_t *base)
- {
- int reletive;
- int count;
-
- if (currententity->frame)
- {
- if (base->alternate_anims)
- base = base->alternate_anims;
- }
-
- if (!base->anim_total)
- return base;
-
- reletive = (int)(cl.time*10) % base->anim_total;
-
- count = 0;
- while (base->anim_min > reletive || base->anim_max <= reletive)
- {
- base = base->anim_next;
- if (!base)
- Sys_Error ("R_TextureAnimation: broken cycle");
- if (++count > 100)
- Sys_Error ("R_TextureAnimation: infinite cycle");
- }
-
- return base;
- }
-
-
- /*
- ===============
- R_DrawSurface
- ===============
- */
- void R_DrawSurface (void)
- {
- unsigned char *basetptr;
- int smax, tmax, twidth;
- int u;
- int soffset, basetoffset, texwidth;
- int horzblockstep;
- unsigned char *pcolumndest;
- void (*pblockdrawer)(void);
- texture_t *mt;
-
- // calculate the lightings
- R_BuildLightMap ();
-
- surfrowbytes = r_drawsurf.rowbytes;
-
- mt = r_drawsurf.texture;
-
- r_source = (byte *)mt + mt->offsets[r_drawsurf.surfmip];
-
- // the fractional light values should range from 0 to (VID_GRADES - 1) << 16
- // from a source range of 0 - 255
-
- texwidth = mt->width >> r_drawsurf.surfmip;
-
- blocksize = 16 >> r_drawsurf.surfmip;
- blockdivshift = 4 - r_drawsurf.surfmip;
- blockdivmask = (1 << blockdivshift) - 1;
-
- r_lightwidth = (r_drawsurf.surf->extents[0]>>4)+1;
-
- r_numhblocks = r_drawsurf.surfwidth >> blockdivshift;
- r_numvblocks = r_drawsurf.surfheight >> blockdivshift;
-
- //==============================
-
- if (r_pixbytes == 1)
- {
- pblockdrawer = surfmiptable[r_drawsurf.surfmip];
- // TODO: only needs to be set when there is a display settings change
- horzblockstep = blocksize;
- }
- else
- {
- pblockdrawer = R_DrawSurfaceBlock16;
- // TODO: only needs to be set when there is a display settings change
- horzblockstep = blocksize << 1;
- }
-
- smax = mt->width >> r_drawsurf.surfmip;
- twidth = texwidth;
- tmax = mt->height >> r_drawsurf.surfmip;
- sourcetstep = texwidth;
- r_stepback = tmax * twidth;
-
- r_sourcemax = r_source + (tmax * smax);
-
- soffset = r_drawsurf.surf->texturemins[0];
- basetoffset = r_drawsurf.surf->texturemins[1];
-
- // << 16 components are to guarantee positive values for %
- soffset = ((soffset >> r_drawsurf.surfmip) + (smax << 16)) % smax;
- basetptr = &r_source[((((basetoffset >> r_drawsurf.surfmip)
- + (tmax << 16)) % tmax) * twidth)];
-
- pcolumndest = r_drawsurf.surfdat;
-
- for (u=0 ; u<r_numhblocks; u++)
- {
- r_lightptr = blocklights + u;
-
- prowdestbase = pcolumndest;
-
- pbasesource = basetptr + soffset;
-
- (*pblockdrawer)();
-
- soffset = soffset + blocksize;
- if (soffset >= smax)
- soffset = 0;
-
- pcolumndest += horzblockstep;
- }
- }
-
-
- //=============================================================================
-
- #if !id386
- #if !id68k
-
- /*
- ================
- R_DrawSurfaceBlock8_mip0
- ================
- */
- void R_DrawSurfaceBlock8_mip0 (void)
- {
- int v;
- int psourcestep, prowdeststep;
- unsigned char *psource, *prowdest, *colormap;
-
- colormap = (unsigned char *)vid.colormap;
- psourcestep = sourcetstep;
- prowdeststep = surfrowbytes;
- psource = pbasesource;
- prowdest = prowdestbase;
-
- for (v=0 ; v<r_numvblocks ; v++)
- {
- int i, lightleft, lightright, lightleftstep, lightrightstep;
-
- // FIXME: use delta rather than both right and left, like ASM?
- lightleft = r_lightptr[0];
- lightright = r_lightptr[1];
- r_lightptr += r_lightwidth;
- lightleftstep = (r_lightptr[0] - lightleft) >> 4;
- lightrightstep = (r_lightptr[1] - lightright) >> 4;
-
- for (i=0 ; i<16 ; i++)
- {
- int b, lightstep, light;
-
- lightstep = (lightleft - lightright) >> 4;
-
- light = lightright;
-
- for (b=15; b>=0; b--)
- {
- prowdest[b] = colormap[(light & 0xFF00) + psource[b]];
- light += lightstep;
- }
-
- psource += psourcestep;
- lightright += lightrightstep;
- lightleft += lightleftstep;
- prowdest += prowdeststep;
- }
-
- if (psource >= r_sourcemax)
- psource -= r_stepback;
- }
- }
-
-
- /*
- ================
- R_DrawSurfaceBlock8_mip1
- ================
- */
- void R_DrawSurfaceBlock8_mip1 (void)
- {
- int v;
- int psourcestep, prowdeststep;
- unsigned char *psource, *prowdest, *colormap;
-
- colormap = (unsigned char *)vid.colormap;
- psourcestep = sourcetstep;
- prowdeststep = surfrowbytes;
- psource = pbasesource;
- prowdest = prowdestbase;
-
- for (v=0 ; v<r_numvblocks ; v++)
- {
- int i, lightleft, lightright, lightleftstep, lightrightstep;
-
- // FIXME: use delta rather than both right and left, like ASM?
- lightleft = r_lightptr[0];
- lightright = r_lightptr[1];
- r_lightptr += r_lightwidth;
- lightleftstep = (r_lightptr[0] - lightleft) >> 3;
- lightrightstep = (r_lightptr[1] - lightright) >> 3;
-
- for (i=0 ; i<8 ; i++)
- {
- int b, lightstep, light;
-
- lightstep = (lightleft - lightright) >> 3;
-
- light = lightright;
-
- for (b=7; b>=0; b--)
- {
- prowdest[b] = colormap[(light & 0xFF00) + psource[b]];
- light += lightstep;
- }
-
- psource += psourcestep;
- lightright += lightrightstep;
- lightleft += lightleftstep;
- prowdest += prowdeststep;
- }
-
- if (psource >= r_sourcemax)
- psource -= r_stepback;
- }
- }
-
-
- /*
- ================
- R_DrawSurfaceBlock8_mip2
- ================
- */
- void R_DrawSurfaceBlock8_mip2 (void)
- {
- int v;
- int psourcestep, prowdeststep;
- unsigned char *psource, *prowdest, *colormap;
-
- colormap = (unsigned char *)vid.colormap;
- psourcestep = sourcetstep;
- prowdeststep = surfrowbytes;
- psource = pbasesource;
- prowdest = prowdestbase;
-
- for (v=0 ; v<r_numvblocks ; v++)
- {
- int i, lightleft, lightright, lightleftstep, lightrightstep;
-
- // FIXME: use delta rather than both right and left, like ASM?
- lightleft = r_lightptr[0];
- lightright = r_lightptr[1];
- r_lightptr += r_lightwidth;
- lightleftstep = (r_lightptr[0] - lightleft) >> 2;
- lightrightstep = (r_lightptr[1] - lightright) >> 2;
-
- for (i=0 ; i<4 ; i++)
- {
- int b, lightstep, light;
-
- lightstep = (lightleft - lightright) >> 2;
-
- light = lightright;
-
- for (b=3; b>=0; b--)
- {
- prowdest[b] = colormap[(light & 0xFF00) + psource[b]];
- light += lightstep;
- }
-
- psource += psourcestep;
- lightright += lightrightstep;
- lightleft += lightleftstep;
- prowdest += prowdeststep;
- }
-
- if (psource >= r_sourcemax)
- psource -= r_stepback;
- }
- }
-
-
- /*
- ================
- R_DrawSurfaceBlock8_mip3
- ================
- */
- void R_DrawSurfaceBlock8_mip3 (void)
- {
- int v;
- int psourcestep, prowdeststep;
- unsigned char *psource, *prowdest, *colormap;
-
- colormap = (unsigned char *)vid.colormap;
- psourcestep = sourcetstep;
- prowdeststep = surfrowbytes;
- psource = pbasesource;
- prowdest = prowdestbase;
-
- for (v=0 ; v<r_numvblocks ; v++)
- {
- int i, lightleft, lightright, lightleftstep, lightrightstep;
-
- // FIXME: use delta rather than both right and left, like ASM?
- lightleft = r_lightptr[0];
- lightright = r_lightptr[1];
- r_lightptr += r_lightwidth;
- lightleftstep = (r_lightptr[0] - lightleft) >> 1;
- lightrightstep = (r_lightptr[1] - lightright) >> 1;
-
- for (i=0 ; i<2 ; i++)
- {
- int b, lightstep, light;
-
- lightstep = (lightleft - lightright) >> 1;
-
- light = lightright;
-
- for (b=1; b>=0; b--)
- {
- prowdest[b] = colormap[(light & 0xFF00) + psource[b]];
- light += lightstep;
- }
-
- psource += psourcestep;
- lightright += lightrightstep;
- lightleft += lightleftstep;
- prowdest += prowdeststep;
- }
-
- if (psource >= r_sourcemax)
- psource -= r_stepback;
- }
- }
-
-
- /*
- ================
- R_DrawSurfaceBlock16
-
- FIXME: make this work
- ================
- */
- void R_DrawSurfaceBlock16 (void)
- {
- int k;
- unsigned char *psource;
- int lighttemp, lightstep, light;
- unsigned short *prowdest;
- int lightleft, lightright, lightleftstep, lightrightstep;
-
- prowdest = (unsigned short *)prowdestbase;
-
- for (k=0 ; k<blocksize ; k++)
- {
- unsigned short *pdest;
- int b;
-
- psource = pbasesource;
- lighttemp = lightright - lightleft;
- lightstep = lighttemp >> blockdivshift;
-
- light = lightleft;
- pdest = prowdest;
-
- for (b=0; b<blocksize; b++)
- {
- *pdest = vid.colormap16[(light & 0xFF00) + *psource];
- psource += sourcesstep;
- pdest++;
- light += lightstep;
- }
-
- pbasesource += sourcetstep;
- lightright += lightrightstep;
- lightleft += lightleftstep;
- prowdest = (unsigned short *)((long)prowdest + surfrowbytes);
- }
-
- prowdestbase = prowdest;
- }
-
- #endif
- #endif
-
-
- //============================================================================
-
- /*
- ================
- R_GenTurbTile
- ================
- */
- void R_GenTurbTile (pixel_t *pbasetex, void *pdest)
- {
- int *turb;
- int i, j, s, t;
- byte *pd;
-
- turb = sintable + ((int)(cl.time*SPEED)&(CYCLE-1));
- pd = (byte *)pdest;
-
- for (i=0 ; i<TILE_SIZE ; i++)
- {
- for (j=0 ; j<TILE_SIZE ; j++)
- {
- s = (((j << 16) + turb[i & (CYCLE-1)]) >> 16) & 63;
- t = (((i << 16) + turb[j & (CYCLE-1)]) >> 16) & 63;
- *pd++ = *(pbasetex + (t<<6) + s);
- }
- }
- }
-
-
- /*
- ================
- R_GenTurbTile16
- ================
- */
- void R_GenTurbTile16 (pixel_t *pbasetex, void *pdest)
- {
- int *turb;
- int i, j, s, t;
- unsigned short *pd;
-
- turb = sintable + ((int)(cl.time*SPEED)&(CYCLE-1));
- pd = (unsigned short *)pdest;
-
- for (i=0 ; i<TILE_SIZE ; i++)
- {
- for (j=0 ; j<TILE_SIZE ; j++)
- {
- s = (((j << 16) + turb[i & (CYCLE-1)]) >> 16) & 63;
- t = (((i << 16) + turb[j & (CYCLE-1)]) >> 16) & 63;
- *pd++ = d_8to16table[*(pbasetex + (t<<6) + s)];
- }
- }
- }
-
-
- /*
- ================
- R_GenTile
- ================
- */
- void R_GenTile (msurface_t *psurf, void *pdest)
- {
- if (psurf->flags & SURF_DRAWTURB)
- {
- if (r_pixbytes == 1)
- {
- R_GenTurbTile ((pixel_t *)
- ((byte *)psurf->texinfo->texture + psurf->texinfo->texture->offsets[0]), pdest);
- }
- else
- {
- R_GenTurbTile16 ((pixel_t *)
- ((byte *)psurf->texinfo->texture + psurf->texinfo->texture->offsets[0]), pdest);
- }
- }
- else if (psurf->flags & SURF_DRAWSKY)
- {
- if (r_pixbytes == 1)
- {
- R_GenSkyTile (pdest);
- }
- else
- {
- R_GenSkyTile16 (pdest);
- }
- }
- else
- {
- Sys_Error ("Unknown tile type");
- }
- }
-
-