quakeforge/nq/source/gl_view.c

/*
	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 "QF/compat.h"

#include "client.h"
#include "glquake.h"
#include "view.h"

extern double      host_frametime; 

extern byte        gammatable[256];

extern qboolean    V_CheckGamma (void);

extern void        V_CalcIntermissionRefdef (void);
extern void        V_CalcRefdef (void);

extern cvar_t     *crosshair;
extern cvar_t     *gl_cshiftpercent;
extern cvar_t	  *cl_cshift_powerup;

extern cvar_t     *scr_ofsx;
extern cvar_t     *scr_ofsy;
extern cvar_t     *scr_ofsz;

byte        ramps[3][256];
float       v_blend[4];					// rgba 0.0 - 1.0


/*
	V_CalcBlend

	LordHavoc made this a real, true alpha blend.  Cleaned it up
	a bit, but otherwise this is his code.  --KB
*/
void
V_CalcBlend (void)
{
	float       r = 0, g = 0, b = 0, a = 0;
	float       a2, a3;
	int         i;

	for (i = 0; i < NUM_CSHIFTS; i++) {
		if (!gl_cshiftpercent->value)
			continue;

		a2 = ((cl.cshifts[i].percent * gl_cshiftpercent->value) / 100.0) / 255.0;

		if (!a2)
			continue;

		a2 = min (a2, 1.0);
		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;
	}

	if ((a2 = 1 - bound (0.0, contrast->value, 1.0)) < 0.999) { // add contrast
        r += (128 - r) * a2; 
        g += (128 - g) * a2; 
        b += (128 - 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);
}


void
V_CalcPowerupCshift (void)
{
	if (!cl_cshift_powerup->int_val)
//		|| (atoi (Info_ValueForKey (cl.serverinfo, "cshifts")) & INFO_CSHIFT_POWERUP))
		return;

	if ((gl_dlight_polyblend->int_val ||
		 !(gl_dlight_lightmap->int_val && gl_dlight_polyblend->int_val)) &&
		(cl.items & IT_INVULNERABILITY ||
		 cl.items & IT_QUAD))
	{
		if (cl.items & IT_INVULNERABILITY &&
			cl.items & IT_QUAD) {
			cl.cshifts[CSHIFT_POWERUP].destcolor[0] = 255;
			cl.cshifts[CSHIFT_POWERUP].destcolor[1] = 0;
			cl.cshifts[CSHIFT_POWERUP].destcolor[2] = 255;
			cl.cshifts[CSHIFT_POWERUP].percent = 30;
		} else if (cl.items & IT_QUAD) {
			cl.cshifts[CSHIFT_POWERUP].destcolor[0] = 0;
			cl.cshifts[CSHIFT_POWERUP].destcolor[1] = 0;
			cl.cshifts[CSHIFT_POWERUP].destcolor[2] = 255;
			cl.cshifts[CSHIFT_POWERUP].percent = 30;
		} else if (cl.items & IT_INVULNERABILITY) {
			cl.cshifts[CSHIFT_POWERUP].destcolor[0] = 255;
			cl.cshifts[CSHIFT_POWERUP].destcolor[1] = 255;
			cl.cshifts[CSHIFT_POWERUP].destcolor[2] = 0;
			cl.cshifts[CSHIFT_POWERUP].percent = 30;
		}
	} else if (cl.items & IT_SUIT) {
		cl.cshifts[CSHIFT_POWERUP].destcolor[0] = 0;
		cl.cshifts[CSHIFT_POWERUP].destcolor[1] = 255;
		cl.cshifts[CSHIFT_POWERUP].destcolor[2] = 0;
		cl.cshifts[CSHIFT_POWERUP].percent = 20;
	} else if (cl.items & IT_INVISIBILITY) {
		cl.cshifts[CSHIFT_POWERUP].destcolor[0] = 100;
		cl.cshifts[CSHIFT_POWERUP].destcolor[1] = 100;
		cl.cshifts[CSHIFT_POWERUP].destcolor[2] = 100;
		cl.cshifts[CSHIFT_POWERUP].percent = 100;
	} else
		cl.cshifts[CSHIFT_POWERUP].percent = 0;
}


/*
	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;
	qboolean    force;

	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;
	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;
	if (cl.cshifts[CSHIFT_BONUS].percent < 0)
		cl.cshifts[CSHIFT_BONUS].percent = 0;

	force = V_CheckGamma ();
	if (!new && !force)
		return;

	V_CalcBlend ();
}