quakeforge/libs/video/renderer/sw32/vid_common_sw32.c

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/*
vid_common_sw32.c
general video driver functions
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:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
static __attribute__ ((used)) const char rcsid[] = "$Id$";
#include "QF/console.h"
#include "QF/cvar.h"
#include "QF/mathlib.h"
#include "QF/qargs.h"
#include "QF/sys.h"
#include "QF/va.h"
#include "QF/vid.h"
#include "compat.h"
#include "r_internal.h"
#include "vid_internal.h"
unsigned short sw32_8to16table[256];
/*
lhfindcolor
LordHavoc: finds nearest matching color in a palette
*/
static int
lhfindcolor (byte *pal, int colors, int r, int g, int b)
{
int i, dist, best, bestdist, rd, gd, bd;
best = 0;
bestdist = 1000000000;
for (i = 0;i < colors;i++)
{
rd = pal[i*3+0] - r;
gd = pal[i*3+1] - g;
bd = pal[i*3+2] - b;
dist = rd*rd+gd*gd+bd*bd;
if (dist < bestdist)
{
if (!dist) // exact match
return i;
best = i;
bestdist = dist;
}
}
return best;
}
/*
VID_MakeColormap32
LordHavoc: makes a 32bit color*light table, RGBA order, no endian,
may need to be re-ordered to hardware at display time
*/
static void
VID_MakeColormap32 (void *outcolormap, byte *pal)
{
int c, l;
byte *out;
out = (byte *)&d_8to24table;
for (c = 0; c < 256; c++) {
*out++ = pal[c*3+0];
*out++ = pal[c*3+1];
*out++ = pal[c*3+2];
*out++ = 255;
}
d_8to24table[255] = 0; // 255 is transparent
out = (byte *) outcolormap;
for (l = 0;l < VID_GRADES;l++)
{
for (c = 0;c < vid.fullbright;c++)
{
out[(l*256+c)*4+0] = bound(0, (pal[c*3+0] * l) >> (VID_CBITS - 1),
255);
out[(l*256+c)*4+1] = bound(0, (pal[c*3+1] * l) >> (VID_CBITS - 1),
255);
out[(l*256+c)*4+2] = bound(0, (pal[c*3+2] * l) >> (VID_CBITS - 1),
255);
out[(l*256+c)*4+3] = 255;
}
for (;c < 255;c++)
{
out[(l*256+c)*4+0] = pal[c*3+0];
out[(l*256+c)*4+1] = pal[c*3+1];
out[(l*256+c)*4+2] = pal[c*3+2];
out[(l*256+c)*4+3] = 255;
}
out[(l*256+255)*4+0] = 0;
out[(l*256+255)*4+1] = 0;
out[(l*256+255)*4+2] = 0;
out[(l*256+255)*4+3] = 0;
}
}
static unsigned short
lh24to16bit (int red, int green, int blue)
{
red = bound(0, red, 255);
green = bound(0, green, 255);
blue = bound(0, blue, 255);
red >>= 3;
green >>= 2;
blue >>= 3;
red <<= 11;
green <<= 5;
return (unsigned short) (red | green | blue);
}
/*
VID_MakeColormap16
LordHavoc: makes a 16bit color*light table, RGB order, native endian,
may need to be translated to hardware order at display time
*/
static void
VID_MakeColormap16 (void *outcolormap, byte *pal)
{
int c, l;
unsigned short *out;
out = (unsigned short *)&sw32_8to16table;
for (c = 0; c < 256; c++)
*out++ = lh24to16bit(pal[c*3+0], pal[c*3+1], pal[c*3+2]);
sw32_8to16table[255] = 0; // 255 is transparent
out = (unsigned short *) outcolormap;
for (l = 0;l < VID_GRADES;l++)
{
for (c = 0;c < vid.fullbright;c++)
out[l*256+c] = lh24to16bit(
(pal[c*3+0] * l) >> (VID_CBITS - 1),
(pal[c*3+1] * l) >> (VID_CBITS - 1),
(pal[c*3+2] * l) >> (VID_CBITS - 1));
for (;c < 255;c++)
out[l*256+c] = lh24to16bit(pal[c*3+0], pal[c*3+1], pal[c*3+2]);
out[l*256+255] = 0;
}
}
/*
VID_MakeColormap8
LordHavoc: makes a 8bit color*light table
*/
static void
VID_MakeColormap8 (void *outcolormap, byte *pal)
{
int c, l;
byte *out;
out = (byte *) outcolormap;
for (l = 0;l < VID_GRADES;l++)
{
for (c = 0;c < vid.fullbright;c++)
out[l*256+c] = lhfindcolor(pal, 256,
(pal[c*3+0] * l) >> (VID_CBITS - 1),
(pal[c*3+1] * l) >> (VID_CBITS - 1),
(pal[c*3+2] * l) >> (VID_CBITS - 1));
for (;c < 256;c++)
out[l*256+c] = c;
}
}
/*
VID_MakeColormaps
LordHavoc: makes 8bit, 16bit, and 32bit colormaps and palettes
*/
static __attribute__((used)) void //FIXME
VID_MakeColormaps (int fullbrights, byte *pal)
{
vid.fullbright = fullbrights;
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vid.colormap8 = malloc (256*VID_GRADES * sizeof (byte));
vid.colormap16 = malloc (256*VID_GRADES * sizeof (short));
vid.colormap32 = malloc (256*VID_GRADES * sizeof (int));
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SYS_CHECKMEM (vid.colormap8 && vid.colormap16 && vid.colormap32);
VID_MakeColormap8(vid.colormap8, pal);
VID_MakeColormap16(vid.colormap16, pal);
VID_MakeColormap32(vid.colormap32, pal);
}