/*
Copyright (C) 1996-1997 Id Software, Inc.
Copyright (C) 1999,2000  contributors of the QuakeForge project
Please see the file "AUTHORS" for a list of contributors

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 the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// view.c -- player eye positioning

#include <string.h>
#include <stdio.h>

#include "bothdefs.h"   // needed by: common.h, net.h, client.h

#include "common.h"
#include "bspfile.h"    // needed by: glquake.h
#include "vid.h"
#include "sys.h"
#include "zone.h"       // needed by: client.h, gl_model.h
#include "mathlib.h"    // needed by: protocol.h, render.h, client.h,
                        //  modelgen.h, glmodel.h
#include "wad.h"
#include "draw.h"
#include "cvar.h"
#include "net.h"        // needed by: client.h
#include "protocol.h"   // needed by: client.h
#include "cmd.h"
#include "sbar.h"
#include "render.h"     // needed by: client.h, model.h, glquake.h
#include "client.h"     // need cls in this file
#include "model.h"      // needed by: glquake.h
#include "console.h"
#include "glquake.h"

extern  byte            *host_basepal;
extern      double          host_frametime;
extern int	onground;
extern	byte	gammatable[256];

cvar_t  gl_cshiftpercent = {"gl_cshiftpercent", "100", false};

byte ramps[3][256];
float	v_blend[4];

void V_CalcPowerupCshift (void);
qboolean V_CheckGamma (void);

/*
=============
V_CalcBlend
=============
*/
void V_CalcBlend (void)
{
        float   r, g, b, a, a2;
        int             j;

        r = 0;
        g = 0;
        b = 0;
        a = 0;

        for (j=0 ; j<NUM_CSHIFTS ; j++)
        {
                if (!gl_cshiftpercent.value)
                        continue;

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

//              a2 = (cl.cshifts[j].percent/2)/255.0;
                if (!a2)
                        continue;
                a = a + a2*(1-a);
//Con_Printf ("j:%i a:%f\n", j, a);
                a2 = a2/a;
                r = r*(1-a2) + cl.cshifts[j].destcolor[0]*a2;
                g = g*(1-a2) + cl.cshifts[j].destcolor[1]*a2;
                b = b*(1-a2) + cl.cshifts[j].destcolor[2]*a2;
        }

        v_blend[0] = r/255.0;
        v_blend[1] = g/255.0;
        v_blend[2] = b/255.0;
        v_blend[3] = a;
        if (v_blend[3] > 1)
                v_blend[3] = 1;
        if (v_blend[3] < 0)
                v_blend[3] = 0;
}

/*
=============
V_UpdatePalette
=============
*/

void V_UpdatePalette (void)
{
	int		i, j;
	qboolean	new;
	byte	*basepal, *newpal;
	byte	pal[768];
	float	r,g,b,a;
	int		ir, ig, ib;
	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 ();

//Con_Printf("b: %4.2f %4.2f %4.2f %4.6f\n", v_blend[0],	v_blend[1],	v_blend[2],	v_blend[3]);

	a = v_blend[3];
	r = 255*v_blend[0]*a;
	g = 255*v_blend[1]*a;
	b = 255*v_blend[2]*a;

	a = 1-a;
	for (i=0 ; i<256 ; i++)
	{
		ir = i*a + r;
		ig = i*a + g;
		ib = i*a + b;
		if (ir > 255)
			ir = 255;
		if (ig > 255)
			ig = 255;
		if (ib > 255)
			ib = 255;

		ramps[0][i] = gammatable[ir];
		ramps[1][i] = gammatable[ig];
		ramps[2][i] = gammatable[ib];
	}

	basepal = host_basepal;
	newpal = pal;
	
	for (i=0 ; i<256 ; i++)
	{
		ir = basepal[0];
		ig = basepal[1];
		ib = basepal[2];
		basepal += 3;
		
		newpal[0] = ramps[0][ir];
		newpal[1] = ramps[1][ig];
		newpal[2] = ramps[2][ib];
		newpal += 3;
	}

	VID_ShiftPalette (pal);	
}