mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-23 21:02:50 +00:00
267 lines
6.2 KiB
C
267 lines
6.2 KiB
C
/*
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vid_common_sw32.c
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general video driver functions
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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/cvar.h"
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#include "QF/qargs.h"
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#include "QF/sys.h"
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#include "QF/va.h"
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#include "QF/vid.h"
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#include "compat.h"
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unsigned short d_8to16table[256];
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unsigned char d_15to8table[65536];
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/*
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lhfindcolor
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LordHavoc: finds nearest matching color in a palette
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*/
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static int
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lhfindcolor (byte *pal, int colors, int r, int g, int b)
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{
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int i, dist, best, bestdist, rd, gd, bd;
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best = 0;
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bestdist = 1000000000;
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for (i = 0;i < colors;i++)
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{
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rd = pal[i*3+0] - r;
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gd = pal[i*3+1] - g;
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bd = pal[i*3+2] - b;
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dist = rd*rd+gd*gd+bd*bd;
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if (dist < bestdist)
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{
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if (!dist) // exact match
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return i;
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best = i;
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bestdist = dist;
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}
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}
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return best;
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}
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/*
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VID_MakeColormap32
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LordHavoc: makes a 32bit color*light table, RGBA order, no endian,
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may need to be re-ordered to hardware at display time
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*/
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static void
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VID_MakeColormap32 (void *outcolormap, byte *pal)
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{
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int c, l;
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byte *out;
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out = (byte *)&d_8to24table;
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for (c = 0; c < 256; c++) {
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*out++ = pal[c*3+0];
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*out++ = pal[c*3+1];
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*out++ = pal[c*3+2];
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*out++ = 255;
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}
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d_8to24table[255] = 0; // 255 is transparent
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out = (byte *) outcolormap;
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for (l = 0;l < VID_GRADES;l++)
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{
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for (c = 0;c < vid.fullbright;c++)
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{
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out[(l*256+c)*4+0] = bound(0, (pal[c*3+0] * l) >> (VID_CBITS - 1),
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255);
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out[(l*256+c)*4+1] = bound(0, (pal[c*3+1] * l) >> (VID_CBITS - 1),
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255);
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out[(l*256+c)*4+2] = bound(0, (pal[c*3+2] * l) >> (VID_CBITS - 1),
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255);
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out[(l*256+c)*4+3] = 255;
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}
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for (;c < 255;c++)
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{
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out[(l*256+c)*4+0] = pal[c*3+0];
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out[(l*256+c)*4+1] = pal[c*3+1];
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out[(l*256+c)*4+2] = pal[c*3+2];
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out[(l*256+c)*4+3] = 255;
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}
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out[(l*256+255)*4+0] = 0;
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out[(l*256+255)*4+1] = 0;
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out[(l*256+255)*4+2] = 0;
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out[(l*256+255)*4+3] = 0;
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}
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}
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static unsigned short
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lh24to16bit (int red, int green, int blue)
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{
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red = bound(0, red, 255);
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green = bound(0, green, 255);
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blue = bound(0, blue, 255);
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red >>= 3;
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green >>= 2;
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blue >>= 3;
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red <<= 11;
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green <<= 5;
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return (unsigned short) (red | green | blue);
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}
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/*
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VID_MakeColormap16
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LordHavoc: makes a 16bit color*light table, RGB order, native endian,
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may need to be translated to hardware order at display time
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*/
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static void
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VID_MakeColormap16 (void *outcolormap, byte *pal)
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{
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int c, l;
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unsigned short *out;
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out = (unsigned short *)&d_8to16table;
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for (c = 0; c < 256; c++)
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*out++ = lh24to16bit(pal[c*3+0], pal[c*3+1], pal[c*3+2]);
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d_8to16table[255] = 0; // 255 is transparent
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out = (unsigned short *) outcolormap;
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for (l = 0;l < VID_GRADES;l++)
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{
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for (c = 0;c < vid.fullbright;c++)
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out[l*256+c] = lh24to16bit(
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(pal[c*3+0] * l) >> (VID_CBITS - 1),
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(pal[c*3+1] * l) >> (VID_CBITS - 1),
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(pal[c*3+2] * l) >> (VID_CBITS - 1));
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for (;c < 255;c++)
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out[l*256+c] = lh24to16bit(pal[c*3+0], pal[c*3+1], pal[c*3+2]);
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out[l*256+255] = 0;
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}
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}
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/*
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VID_MakeColormap8
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LordHavoc: makes a 8bit color*light table
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*/
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static void
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VID_MakeColormap8 (void *outcolormap, byte *pal)
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{
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int c, l;
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byte *out;
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out = (byte *) outcolormap;
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for (l = 0;l < VID_GRADES;l++)
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{
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for (c = 0;c < vid.fullbright;c++)
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out[l*256+c] = lhfindcolor(pal, 256,
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(pal[c*3+0] * l) >> (VID_CBITS - 1),
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(pal[c*3+1] * l) >> (VID_CBITS - 1),
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(pal[c*3+2] * l) >> (VID_CBITS - 1));
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for (;c < 256;c++)
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out[l*256+c] = c;
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}
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}
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/*
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VID_MakeColormaps
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LordHavoc: makes 8bit, 16bit, and 32bit colormaps and palettes
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*/
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void
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VID_MakeColormaps (int fullbrights, byte *pal)
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{
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vid.fullbright = fullbrights;
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vid.colormap8 = malloc (256*VID_GRADES * sizeof (byte));
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vid.colormap16 = malloc (256*VID_GRADES * sizeof (short));
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vid.colormap32 = malloc (256*VID_GRADES * sizeof (int));
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SYS_CHECKMEM (vid.colormap8 && vid.colormap16 && vid.colormap32);
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VID_MakeColormap8(vid.colormap8, pal);
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VID_MakeColormap16(vid.colormap16, pal);
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VID_MakeColormap32(vid.colormap32, pal);
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}
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void
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VID_InitBuffers (void)
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{
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int buffersize, zbuffersize, cachesize = 1;
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// Calculate the sizes we want first
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buffersize = vid.rowbytes * vid.height;
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zbuffersize = vid.width * vid.height * sizeof (*vid.zbuffer);
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if (vid.surf_cache_size)
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cachesize = vid.surf_cache_size (vid.width, vid.height);
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// Free the old z-buffer
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if (vid.zbuffer) {
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free (vid.zbuffer);
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vid.zbuffer = NULL;
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}
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// Free the old surface cache
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if (vid.surfcache) {
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if (vid.flush_caches)
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vid.flush_caches ();
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free (vid.surfcache);
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vid.surfcache = NULL;
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}
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if (vid.do_screen_buffer) {
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vid.do_screen_buffer ();
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} else {
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// Free the old screen buffer
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if (vid.buffer) {
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free (vid.buffer);
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vid.conbuffer = vid.buffer = NULL;
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}
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// Allocate the new screen buffer
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vid.conbuffer = vid.buffer = calloc (buffersize, 1);
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if (!vid.conbuffer) {
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Sys_Error ("Not enough memory for video mode");
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}
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}
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// Allocate the new z-buffer
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vid.zbuffer = calloc (zbuffersize, 1);
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if (!vid.zbuffer) {
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free (vid.buffer);
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vid.conbuffer = vid.buffer = NULL;
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Sys_Error ("Not enough memory for video mode");
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}
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// Allocate the new surface cache; free the z-buffer if we fail
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vid.surfcache = calloc (cachesize, 1);
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if (!vid.surfcache) {
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free (vid.buffer);
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free (vid.zbuffer);
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vid.zbuffer = NULL;
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Sys_Error ("Not enough memory for video mode");
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}
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if (vid.init_caches)
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vid.init_caches (vid.surfcache, cachesize);
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}
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void
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VID_ShiftPalette (unsigned char *p)
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{
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VID_SetPalette (p);
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}
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