mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-12-02 17:12:55 +00:00
493 lines
11 KiB
C
493 lines
11 KiB
C
/*
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sw_rsurf.c
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surface-related refresh code
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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static __attribute__ ((unused)) const char rcsid[] =
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"$Id$";
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#include "QF/render.h"
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#include "QF/sys.h"
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#include "r_local.h"
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drawsurf_t r_drawsurf;
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int lightleft, sourcesstep, blocksize, sourcetstep;
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int lightdelta, lightdeltastep;
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int lightright, lightleftstep, lightrightstep, blockdivshift;
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unsigned int blockdivmask;
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void *prowdestbase;
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unsigned char *pbasesource;
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int surfrowbytes; // used by ASM files
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unsigned int *r_lightptr;
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int r_stepback;
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int r_lightwidth;
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int r_numhblocks, r_numvblocks;
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unsigned char *r_source, *r_sourcemax;
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static void (*surfmiptable[4]) (void) = {
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R_DrawSurfaceBlock_mip0, R_DrawSurfaceBlock_mip1,
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R_DrawSurfaceBlock_mip2, R_DrawSurfaceBlock_mip3};
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unsigned int blocklights[34 * 34]; //FIXME make dynamic
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static void
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R_AddDynamicLights (void)
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{
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msurface_t *surf;
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int lnum;
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int sd, td;
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float dist, rad, minlight;
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vec3_t impact, local, lightorigin;
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int s, t;
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int i;
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int smax, tmax;
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mtexinfo_t *tex;
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surf = r_drawsurf.surf;
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smax = (surf->extents[0] >> 4) + 1;
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tmax = (surf->extents[1] >> 4) + 1;
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tex = surf->texinfo;
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for (lnum = 0; lnum < r_maxdlights; lnum++) {
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if (!(surf->dlightbits & (1 << lnum)))
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continue; // not lit by this light
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VectorSubtract (r_dlights[lnum].origin, currententity->origin,
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lightorigin);
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rad = r_dlights[lnum].radius;
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dist = DotProduct (lightorigin, surf->plane->normal) -
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surf->plane->dist;
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rad -= fabs (dist);
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minlight = r_dlights[lnum].minlight;
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if (rad < minlight)
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continue;
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minlight = rad - minlight;
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for (i = 0; i < 3; i++)
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impact[i] = lightorigin[i] - surf->plane->normal[i] * dist;
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local[0] = DotProduct (impact, tex->vecs[0]) + tex->vecs[0][3];
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local[1] = DotProduct (impact, tex->vecs[1]) + tex->vecs[1][3];
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local[0] -= surf->texturemins[0];
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local[1] -= surf->texturemins[1];
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for (t = 0; t < tmax; t++) {
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td = local[1] - t * 16;
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if (td < 0)
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td = -td;
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for (s = 0; s < smax; s++) {
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sd = local[0] - s * 16;
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if (sd < 0)
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sd = -sd;
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if (sd > td)
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dist = sd + (td >> 1);
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else
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dist = td + (sd >> 1);
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if (dist < minlight)
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blocklights[t * smax + s] += (rad - dist) * 256;
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}
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}
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}
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}
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/*
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R_BuildLightMap
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Combine and scale multiple lightmaps into the 8.8 format in blocklights
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*/
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static void
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R_BuildLightMap (void)
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{
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int smax, tmax;
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int t;
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int i, size;
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byte *lightmap;
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unsigned int scale;
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int maps;
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msurface_t *surf;
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surf = r_drawsurf.surf;
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smax = (surf->extents[0] >> 4) + 1;
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tmax = (surf->extents[1] >> 4) + 1;
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size = smax * tmax;
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lightmap = surf->samples;
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if (!r_worldentity.model->lightdata) {
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for (i = 0; i < size; i++)
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blocklights[i] = 0;
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return;
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}
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// clear to ambient
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for (i = 0; i < size; i++)
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blocklights[i] = r_refdef.ambientlight << 8;
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// add all the lightmaps
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if (lightmap)
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for (maps = 0; maps < MAXLIGHTMAPS && surf->styles[maps] != 255; maps++) {
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scale = r_drawsurf.lightadj[maps]; // 8.8 fraction
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for (i = 0; i < size; i++)
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blocklights[i] += lightmap[i] * scale;
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lightmap += size; // skip to next lightmap
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}
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// add all the dynamic lights
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if (surf->dlightframe == r_framecount)
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R_AddDynamicLights ();
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// bound, invert, and shift
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for (i = 0; i < size; i++) {
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t = (255 * 256 - (int) blocklights[i]) >> (8 - VID_CBITS);
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if (t < (1 << 6))
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t = (1 << 6);
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blocklights[i] = t;
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}
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}
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/*
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R_TextureAnimation
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Returns the proper texture for a given time and base texture
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*/
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texture_t *
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R_TextureAnimation (msurface_t *surf)
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{
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texture_t *base = surf->texinfo->texture;
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int relative;
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int count;
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if (currententity->frame) {
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if (base->alternate_anims)
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base = base->alternate_anims;
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}
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if (!base->anim_total)
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return base;
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relative = (int) (r_realtime * 10) % base->anim_total;
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count = 0;
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while (base->anim_min > relative || base->anim_max <= relative) {
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base = base->anim_next;
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if (!base)
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Sys_Error ("R_TextureAnimation: broken cycle");
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if (++count > 100)
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Sys_Error ("R_TextureAnimation: infinite cycle");
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}
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return base;
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}
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void
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R_DrawSurface (void)
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{
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byte *basetptr;
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int smax, tmax, twidth;
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int u;
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int soffset, basetoffset, texwidth;
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int horzblockstep;
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byte *pcolumndest;
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void (*pblockdrawer) (void);
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texture_t *mt;
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// calculate the lightings
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R_BuildLightMap ();
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surfrowbytes = r_drawsurf.rowbytes;
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mt = r_drawsurf.texture;
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r_source = (byte *) mt + mt->offsets[r_drawsurf.surfmip];
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// the fractional light values should range from 0 to
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// (VID_GRADES - 1) << 16 from a source range of 0 - 255
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texwidth = mt->width >> r_drawsurf.surfmip;
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blocksize = 16 >> r_drawsurf.surfmip;
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blockdivshift = 4 - r_drawsurf.surfmip;
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blockdivmask = (1 << blockdivshift) - 1;
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r_lightwidth = (r_drawsurf.surf->extents[0] >> 4) + 1;
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r_numhblocks = r_drawsurf.surfwidth >> blockdivshift;
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r_numvblocks = r_drawsurf.surfheight >> blockdivshift;
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//==============================
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pblockdrawer = surfmiptable[r_drawsurf.surfmip];
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// TODO: only needs to be set when there is a display settings change
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horzblockstep = blocksize;
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smax = mt->width >> r_drawsurf.surfmip;
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twidth = texwidth;
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tmax = mt->height >> r_drawsurf.surfmip;
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sourcetstep = texwidth;
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r_stepback = tmax * twidth;
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r_sourcemax = r_source + (tmax * smax);
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soffset = r_drawsurf.surf->texturemins[0];
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basetoffset = r_drawsurf.surf->texturemins[1];
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// << 16 components are to guarantee positive values for %
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soffset = ((soffset >> r_drawsurf.surfmip) + (smax << 16)) % smax;
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basetptr = &r_source[((((basetoffset >> r_drawsurf.surfmip)
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+ (tmax << 16)) % tmax) * twidth)];
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pcolumndest = r_drawsurf.surfdat;
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for (u = 0; u < r_numhblocks; u++) {
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r_lightptr = blocklights + u;
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prowdestbase = pcolumndest;
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pbasesource = basetptr + soffset;
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(*pblockdrawer) ();
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soffset = soffset + blocksize;
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if (soffset >= smax)
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soffset = 0;
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pcolumndest += horzblockstep;
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}
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}
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#ifdef PIC
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# undef USE_INTEL_ASM //XXX asm pic hack
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#endif
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#ifndef USE_INTEL_ASM
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void
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R_DrawSurfaceBlock_mip0 (void)
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{
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int v, i, b, lightstep, lighttemp, light;
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unsigned char pix, *psource, *prowdest;
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psource = pbasesource;
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prowdest = prowdestbase;
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for (v = 0; v < r_numvblocks; v++) {
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// FIXME: make these locals?
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// FIXME: use delta rather than both right and left, like ASM?
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lightleft = r_lightptr[0];
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lightright = r_lightptr[1];
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r_lightptr += r_lightwidth;
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lightleftstep = (r_lightptr[0] - lightleft) >> 4;
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lightrightstep = (r_lightptr[1] - lightright) >> 4;
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for (i = 0; i < 16; i++) {
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lighttemp = lightleft - lightright;
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lightstep = lighttemp >> 4;
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light = lightright;
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for (b = 15; b >= 0; b--) {
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pix = psource[b];
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prowdest[b] = ((unsigned char *) vid.colormap8)
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[(light & 0xFF00) + pix];
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light += lightstep;
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}
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psource += sourcetstep;
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lightright += lightrightstep;
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lightleft += lightleftstep;
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prowdest += surfrowbytes;
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}
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if (psource >= r_sourcemax)
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psource -= r_stepback;
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}
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}
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void
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R_DrawSurfaceBlock_mip1 (void)
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{
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int v, i, b, lightstep, lighttemp, light;
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unsigned char pix, *psource, *prowdest;
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psource = pbasesource;
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prowdest = prowdestbase;
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for (v = 0; v < r_numvblocks; v++) {
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// FIXME: make these locals?
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// FIXME: use delta rather than both right and left, like ASM?
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lightleft = r_lightptr[0];
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lightright = r_lightptr[1];
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r_lightptr += r_lightwidth;
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lightleftstep = (r_lightptr[0] - lightleft) >> 3;
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lightrightstep = (r_lightptr[1] - lightright) >> 3;
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for (i = 0; i < 8; i++) {
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lighttemp = lightleft - lightright;
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lightstep = lighttemp >> 3;
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light = lightright;
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for (b = 7; b >= 0; b--) {
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pix = psource[b];
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prowdest[b] = ((unsigned char *) vid.colormap8)
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[(light & 0xFF00) + pix];
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light += lightstep;
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}
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psource += sourcetstep;
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lightright += lightrightstep;
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lightleft += lightleftstep;
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prowdest += surfrowbytes;
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}
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if (psource >= r_sourcemax)
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psource -= r_stepback;
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}
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}
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void
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R_DrawSurfaceBlock_mip2 (void)
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{
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int v, i, b, lightstep, lighttemp, light;
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unsigned char pix, *psource, *prowdest;
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psource = pbasesource;
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prowdest = prowdestbase;
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for (v = 0; v < r_numvblocks; v++) {
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// FIXME: make these locals?
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// FIXME: use delta rather than both right and left, like ASM?
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lightleft = r_lightptr[0];
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lightright = r_lightptr[1];
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r_lightptr += r_lightwidth;
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lightleftstep = (r_lightptr[0] - lightleft) >> 2;
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lightrightstep = (r_lightptr[1] - lightright) >> 2;
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for (i = 0; i < 4; i++) {
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lighttemp = lightleft - lightright;
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lightstep = lighttemp >> 2;
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light = lightright;
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for (b = 3; b >= 0; b--) {
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pix = psource[b];
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prowdest[b] = ((unsigned char *) vid.colormap8)
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[(light & 0xFF00) + pix];
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light += lightstep;
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}
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psource += sourcetstep;
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lightright += lightrightstep;
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lightleft += lightleftstep;
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prowdest += surfrowbytes;
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}
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if (psource >= r_sourcemax)
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psource -= r_stepback;
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}
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}
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void
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R_DrawSurfaceBlock_mip3 (void)
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{
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int v, i, b, lightstep, lighttemp, light;
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unsigned char pix, *psource, *prowdest;
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psource = pbasesource;
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prowdest = prowdestbase;
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for (v = 0; v < r_numvblocks; v++) {
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// FIXME: make these locals?
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// FIXME: use delta rather than both right and left, like ASM?
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lightleft = r_lightptr[0];
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lightright = r_lightptr[1];
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r_lightptr += r_lightwidth;
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lightleftstep = (r_lightptr[0] - lightleft) >> 1;
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lightrightstep = (r_lightptr[1] - lightright) >> 1;
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for (i = 0; i < 2; i++) {
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lighttemp = lightleft - lightright;
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lightstep = lighttemp >> 1;
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light = lightright;
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for (b = 1; b >= 0; b--) {
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pix = psource[b];
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prowdest[b] = ((unsigned char *) vid.colormap8)
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[(light & 0xFF00) + pix];
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light += lightstep;
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}
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psource += sourcetstep;
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lightright += lightrightstep;
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lightleft += lightleftstep;
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prowdest += surfrowbytes;
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}
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if (psource >= r_sourcemax)
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psource -= r_stepback;
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}
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}
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#endif
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static void
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R_GenTurbTile (byte *pbasetex, void *pdest)
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{
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int *turb;
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int i, j, s, t;
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byte *pd;
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turb = sintable + ((int) (r_realtime * SPEED) & (CYCLE - 1));
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pd = (byte *) pdest;
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for (i = 0; i < TILE_SIZE; i++) {
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for (j = 0; j < TILE_SIZE; j++) {
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s = (((j << 16) + turb[i & (CYCLE - 1)]) >> 16) & 63;
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t = (((i << 16) + turb[j & (CYCLE - 1)]) >> 16) & 63;
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*pd++ = *(pbasetex + (t << 6) + s);
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}
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}
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}
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void
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R_GenTile (msurface_t *psurf, void *pdest)
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{
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if (psurf->flags & SURF_DRAWTURB) {
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R_GenTurbTile (((byte *) psurf->texinfo->texture +
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psurf->texinfo->texture->offsets[0]), pdest);
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} else if (psurf->flags & SURF_DRAWSKY) {
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R_GenSkyTile (pdest);
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} else {
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Sys_Error ("Unknown tile type");
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}
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}
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