quakeforge/qw/source/gl_view.c

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/*
gl_view.c
player eye positioning
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
$Id$
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <stdio.h>
#include "compat.h"
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#include "QF/cvar.h"
#include "QF/info.h"
#include "bothdefs.h"
#include "client.h"
#include "view.h"
#include "r_cvar.h"
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extern double host_frametime;
extern cvar_t *cl_cshift_powerup;
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byte ramps[3][256];
float v_blend[4];
/*
V_CalcBlend
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LordHavoc made this a real, true alpha blend. Cleaned it up
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a bit, but otherwise this is his code. --KB
*/
void
V_CalcBlend (void)
{
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float r = 0, g = 0, b = 0, a = 0;
float a2, a3;
int i;
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for (i = 0; i < NUM_CSHIFTS; i++) {
a2 = cl.cshifts[i].percent / 255.0;
if (!a2)
continue;
a2 = min (a2, 1.0);
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r += (cl.cshifts[i].destcolor[0] - r) * a2;
g += (cl.cshifts[i].destcolor[1] - g) * a2;
b += (cl.cshifts[i].destcolor[2] - b) * a2;
a3 = (1.0 - a) * (1.0 - a2);
a = 1.0 - a3;
}
// LordHavoc: saturate color
if (a) {
a2 = 1.0 / a;
r *= a2;
g *= a2;
b *= a2;
}
v_blend[0] = min (r, 255.0) / 255.0;
v_blend[1] = min (g, 255.0) / 255.0;
v_blend[2] = min (b, 255.0) / 255.0;
v_blend[3] = bound (0.0, a, 1.0);
}
extern void V_CalcGlowCshift (void);
extern void V_CalcItemCshift (void);
void
V_CalcPowerupCshift (void)
{
if (!cl_cshift_powerup->int_val
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|| (atoi (Info_ValueForKey (cl.serverinfo, "cshifts")) &
INFO_CSHIFT_POWERUP))
return;
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if (gl_dlight_polyblend->int_val
|| !(gl_dlight_lightmap->int_val && gl_dlight_polyblend->int_val)) {
V_CalcGlowCshift ();
} else {
V_CalcItemCshift ();
}
}
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/*
V_UpdatePalette
In software, this function (duh) updates the palette. In GL, all it does is
set up some values for shifting the screen color in a particular direction.
*/
void
V_UpdatePalette (void)
{
int i, j;
qboolean new;
V_CalcPowerupCshift ();
new = false;
for (i = 0; i < NUM_CSHIFTS; i++) {
if (cl.cshifts[i].percent != cl.prev_cshifts[i].percent) {
new = true;
cl.prev_cshifts[i].percent = cl.cshifts[i].percent;
}
for (j = 0; j < 3; j++) {
if (cl.cshifts[i].destcolor[j] != cl.prev_cshifts[i].destcolor[j]) {
new = true;
cl.prev_cshifts[i].destcolor[j] = cl.cshifts[i].destcolor[j];
}
}
}
// drop the damage value
cl.cshifts[CSHIFT_DAMAGE].percent -= host_frametime * 150;
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if (cl.cshifts[CSHIFT_DAMAGE].percent < 0)
cl.cshifts[CSHIFT_DAMAGE].percent = 0;
// drop the bonus value
cl.cshifts[CSHIFT_BONUS].percent -= host_frametime * 100;
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if (cl.cshifts[CSHIFT_BONUS].percent < 0)
cl.cshifts[CSHIFT_BONUS].percent = 0;
if (!new && !vid.recalc_refdef)
return;
V_CalcBlend ();
}