/*
	view.c

	@description@

	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

#include "view.h"
#include "r_local.h"
#include "host.h"
#include "cmd.h"
#include "chase.h"
#include "draw.h"
#include "screen.h"
#include "console.h"
#include "msg.h"

/*

The view is allowed to move slightly from it's true position for bobbing,
but if it exceeds 8 pixels linear distance (spherical, not box), the list of
entities sent from the server may not include everything in the pvs, especially
when crossing a water boudnary.

*/

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

cvar_t	*cl_rollspeed;
cvar_t	*cl_rollangle;

cvar_t	*cl_bob;
cvar_t	*cl_bobcycle;
cvar_t	*cl_bobup;

cvar_t	*v_kicktime;
cvar_t	*v_kickroll;
cvar_t	*v_kickpitch;

cvar_t	*v_iyaw_cycle;
cvar_t	*v_iroll_cycle;
cvar_t	*v_ipitch_cycle;
cvar_t	*v_iyaw_level;
cvar_t	*v_iroll_level;
cvar_t	*v_ipitch_level;

cvar_t	*v_idlescale;

cvar_t	*crosshair;
cvar_t	*crosshaircolor;
cvar_t	*cl_crossx;
cvar_t	*cl_crossy;

cvar_t	*gl_cshiftpercent;

cvar_t	*brightness;
cvar_t	*contrast;

float	v_dmg_time, v_dmg_roll, v_dmg_pitch;

extern	int			in_forward, in_forward2, in_back;

void BuildGammaTable (float, float);

/*
===============
V_CalcBob

===============
*/
float V_CalcBob (void)
{
	float	bob;
	float	cycle;
	
	cycle = cl.time - (int)(cl.time/cl_bobcycle->value)*cl_bobcycle->value;
	cycle /= cl_bobcycle->value;
	if (cycle < cl_bobup->value)
		cycle = M_PI * cycle / cl_bobup->value;
	else
		cycle = M_PI + M_PI*(cycle-cl_bobup->value)/(1.0 - cl_bobup->value);

// bob is proportional to velocity in the xy plane
// (don't count Z, or jumping messes it up)

	bob = sqrt(cl.velocity[0]*cl.velocity[0] + cl.velocity[1]*cl.velocity[1]) * cl_bob->value;
//Con_Printf ("speed: %5.1f\n", Length(cl.velocity));
	bob = bob*0.3 + bob*0.7*sin(cycle);
	if (bob > 4)
		bob = 4;
	else if (bob < -7)
		bob = -7;
	return bob;
	
}


//=============================================================================


cvar_t	*v_centermove;
cvar_t	*v_centerspeed;


void V_StartPitchDrift (void)
{
#if 1
	if (cl.laststop == cl.time)
	{
		return;		// something else is keeping it from drifting
	}
#endif
	if (cl.nodrift || !cl.pitchvel)
	{
		cl.pitchvel = v_centerspeed->value;
		cl.nodrift = false;
		cl.driftmove = 0;
	}
}

void V_StopPitchDrift (void)
{
	cl.laststop = cl.time;
	cl.nodrift = true;
	cl.pitchvel = 0;
}

/*
===============
V_DriftPitch

Moves the client pitch angle towards cl.idealpitch sent by the server.

If the user is adjusting pitch manually, either with lookup/lookdown,
mlook and mouse, or klook and keyboard, pitch drifting is constantly stopped.

Drifting is enabled when the center view key is hit, mlook is released and
lookspring is non 0, or when 
===============
*/
void V_DriftPitch (void)
{
	float		delta, move;

	if (noclip_anglehack || !cl.onground || cls.demoplayback )
	{
		cl.driftmove = 0;
		cl.pitchvel = 0;
		return;
	}

// don't count small mouse motion
	if (cl.nodrift)
	{
		if ( fabs(cl.cmd.forwardmove) < cl_forwardspeed->value)
			cl.driftmove = 0;
		else
			cl.driftmove += host_frametime;
	
		if ( cl.driftmove > v_centermove->value)
		{
			V_StartPitchDrift ();
		}
		return;
	}
	
	delta = cl.idealpitch - cl.viewangles[PITCH];

	if (!delta)
	{
		cl.pitchvel = 0;
		return;
	}

	move = host_frametime * cl.pitchvel;
	cl.pitchvel += host_frametime * v_centerspeed->value;
	
//Con_Printf ("move: %f (%f)\n", move, host_frametime);

	if (delta > 0)
	{
		if (move > delta)
		{
			cl.pitchvel = 0;
			move = delta;
		}
		cl.viewangles[PITCH] += move;
	}
	else if (delta < 0)
	{
		if (move > -delta)
		{
			cl.pitchvel = 0;
			move = -delta;
		}
		cl.viewangles[PITCH] -= move;
	}
}





/*
============================================================================== 
 
						PALETTE FLASHES 
 
============================================================================== 
*/ 
 
 
cshift_t	cshift_empty = { {130,80,50}, 0 };
cshift_t	cshift_water = { {130,80,50}, 128 };
cshift_t	cshift_slime = { {0,25,5}, 150 };
cshift_t	cshift_lava = { {255,80,0}, 150 };

cvar_t	*v_gamma;

byte		gammatable[256];	// palette is sent through this

/*
=================
V_CheckGamma
=================
*/
qboolean V_CheckGamma (void)
{
	static float oldbrightness;
	static float oldcontrast;
	
	if ((brightness->value == oldbrightness) && contrast->value == oldcontrast)
		return false;
	oldbrightness = brightness->value;
	oldcontrast = contrast->value;
	
	BuildGammaTable (brightness->value, contrast->value);
	vid.recalc_refdef = 1;				// force a surface cache flush
	
	return true;
}


/*
===============
V_ParseDamage
===============
*/
void V_ParseDamage (void)
{
	int		armor, blood;
	vec3_t	from;
	int		i;
	vec3_t	forward, right, up;
	entity_t	*ent;
	float	side;
	float	count;
	
	armor = MSG_ReadByte ();
	blood = MSG_ReadByte ();
	for (i=0 ; i<3 ; i++)
		from[i] = MSG_ReadCoord ();

	count = blood*0.5 + armor*0.5;
	if (count < 10)
		count = 10;

	cl.faceanimtime = cl.time + 0.2;		// but sbar face into pain frame

	cl.cshifts[CSHIFT_DAMAGE].percent += 3*count;
	if (cl.cshifts[CSHIFT_DAMAGE].percent < 0)
		cl.cshifts[CSHIFT_DAMAGE].percent = 0;
	if (cl.cshifts[CSHIFT_DAMAGE].percent > 150)
		cl.cshifts[CSHIFT_DAMAGE].percent = 150;

	if (armor > blood)		
	{
		cl.cshifts[CSHIFT_DAMAGE].destcolor[0] = 200;
		cl.cshifts[CSHIFT_DAMAGE].destcolor[1] = 100;
		cl.cshifts[CSHIFT_DAMAGE].destcolor[2] = 100;
	}
	else if (armor)
	{
		cl.cshifts[CSHIFT_DAMAGE].destcolor[0] = 220;
		cl.cshifts[CSHIFT_DAMAGE].destcolor[1] = 50;
		cl.cshifts[CSHIFT_DAMAGE].destcolor[2] = 50;
	}
	else
	{
		cl.cshifts[CSHIFT_DAMAGE].destcolor[0] = 255;
		cl.cshifts[CSHIFT_DAMAGE].destcolor[1] = 0;
		cl.cshifts[CSHIFT_DAMAGE].destcolor[2] = 0;
	}

//
// calculate view angle kicks
//
	ent = &cl_entities[cl.viewentity];
	
	VectorSubtract (from, ent->origin, from);
	VectorNormalize (from);
	
	AngleVectors (ent->angles, forward, right, up);

	side = DotProduct (from, right);
	v_dmg_roll = count*side*v_kickroll->value;
	
	side = DotProduct (from, forward);
	v_dmg_pitch = count*side*v_kickpitch->value;

	v_dmg_time = v_kicktime->value;
}


/*
==================
V_cshift_f
==================
*/
void V_cshift_f (void)
{
	cshift_empty.destcolor[0] = atoi(Cmd_Argv(1));
	cshift_empty.destcolor[1] = atoi(Cmd_Argv(2));
	cshift_empty.destcolor[2] = atoi(Cmd_Argv(3));
	cshift_empty.percent = atoi(Cmd_Argv(4));
}


/*
==================
V_BonusFlash_f

When you run over an item, the server sends this command
==================
*/
void V_BonusFlash_f (void)
{
	cl.cshifts[CSHIFT_BONUS].destcolor[0] = 215;
	cl.cshifts[CSHIFT_BONUS].destcolor[1] = 186;
	cl.cshifts[CSHIFT_BONUS].destcolor[2] = 69;
	cl.cshifts[CSHIFT_BONUS].percent = 50;
}

/*
=============
V_SetContentsColor

Underwater, lava, etc each has a color shift
=============
*/
void V_SetContentsColor (int contents)
{
	switch (contents)
	{
	case CONTENTS_EMPTY:
	case CONTENTS_SOLID:
		cl.cshifts[CSHIFT_CONTENTS] = cshift_empty;
		break;
	case CONTENTS_LAVA:
		cl.cshifts[CSHIFT_CONTENTS] = cshift_lava;
		break;
	case CONTENTS_SLIME:
		cl.cshifts[CSHIFT_CONTENTS] = cshift_slime;
		break;
	default:
		cl.cshifts[CSHIFT_CONTENTS] = cshift_water;
	}
}

/*
=============
V_CalcPowerupCshift
=============
*/
void V_CalcPowerupCshift (void)
{
	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_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 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
		cl.cshifts[CSHIFT_POWERUP].percent = 0;
}


/* 
============================================================================== 
 
						VIEW RENDERING 
 
============================================================================== 
*/ 

float angledelta (float a)
{
	a = anglemod(a);
	if (a > 180)
		a -= 360;
	return a;
}

/*
==================
CalcGunAngle
==================
*/
void CalcGunAngle (void)
{	
	float	yaw, pitch, move;
	static float oldyaw = 0;
	static float oldpitch = 0;
	
	yaw = r_refdef.viewangles[YAW];
	pitch = -r_refdef.viewangles[PITCH];

	yaw = angledelta(yaw - r_refdef.viewangles[YAW]) * 0.4;
	if (yaw > 10)
		yaw = 10;
	if (yaw < -10)
		yaw = -10;
	pitch = angledelta(-pitch - r_refdef.viewangles[PITCH]) * 0.4;
	if (pitch > 10)
		pitch = 10;
	if (pitch < -10)
		pitch = -10;
	move = host_frametime*20;
	if (yaw > oldyaw)
	{
		if (oldyaw + move < yaw)
			yaw = oldyaw + move;
	}
	else
	{
		if (oldyaw - move > yaw)
			yaw = oldyaw - move;
	}
	
	if (pitch > oldpitch)
	{
		if (oldpitch + move < pitch)
			pitch = oldpitch + move;
	}
	else
	{
		if (oldpitch - move > pitch)
			pitch = oldpitch - move;
	}
	
	oldyaw = yaw;
	oldpitch = pitch;

	cl.viewent.angles[YAW] = r_refdef.viewangles[YAW] + yaw;
	cl.viewent.angles[PITCH] = - (r_refdef.viewangles[PITCH] + pitch);

	cl.viewent.angles[ROLL] -= v_idlescale->value * sin(cl.time*v_iroll_cycle->value) * v_iroll_level->value;
	cl.viewent.angles[PITCH] -= v_idlescale->value * sin(cl.time*v_ipitch_cycle->value) * v_ipitch_level->value;
	cl.viewent.angles[YAW] -= v_idlescale->value * sin(cl.time*v_iyaw_cycle->value) * v_iyaw_level->value;
}

/*
==============
V_BoundOffsets
==============
*/
void V_BoundOffsets (void)
{
	entity_t	*ent;
	
	ent = &cl_entities[cl.viewentity];

// absolutely bound refresh reletive to entity clipping hull
// so the view can never be inside a solid wall

	if (r_refdef.vieworg[0] < ent->origin[0] - 14)
		r_refdef.vieworg[0] = ent->origin[0] - 14;
	else if (r_refdef.vieworg[0] > ent->origin[0] + 14)
		r_refdef.vieworg[0] = ent->origin[0] + 14;
	if (r_refdef.vieworg[1] < ent->origin[1] - 14)
		r_refdef.vieworg[1] = ent->origin[1] - 14;
	else if (r_refdef.vieworg[1] > ent->origin[1] + 14)
		r_refdef.vieworg[1] = ent->origin[1] + 14;
	if (r_refdef.vieworg[2] < ent->origin[2] - 22)
		r_refdef.vieworg[2] = ent->origin[2] - 22;
	else if (r_refdef.vieworg[2] > ent->origin[2] + 30)
		r_refdef.vieworg[2] = ent->origin[2] + 30;
}

/*
==============
V_AddIdle

Idle swaying
==============
*/
void V_AddIdle (void)
{
	r_refdef.viewangles[ROLL] += v_idlescale->value * sin(cl.time*v_iroll_cycle->value) * v_iroll_level->value;
	r_refdef.viewangles[PITCH] += v_idlescale->value * sin(cl.time*v_ipitch_cycle->value) * v_ipitch_level->value;
	r_refdef.viewangles[YAW] += v_idlescale->value * sin(cl.time*v_iyaw_cycle->value) * v_iyaw_level->value;
}


/*
==============
V_CalcViewRoll

Roll is induced by movement and damage
==============
*/
void V_CalcViewRoll (void)
{
	float		side;
		
	side = V_CalcRoll (cl_entities[cl.viewentity].angles, cl.velocity);
	r_refdef.viewangles[ROLL] += side;

	if (v_dmg_time > 0)
	{
		r_refdef.viewangles[ROLL] += v_dmg_time/v_kicktime->value*v_dmg_roll;
		r_refdef.viewangles[PITCH] += v_dmg_time/v_kicktime->value*v_dmg_pitch;
		v_dmg_time -= host_frametime;
	}

	if (cl.stats[STAT_HEALTH] <= 0)
	{
		r_refdef.viewangles[ROLL] = 80;	// dead view angle
		return;
	}

}


/*
==================
V_CalcIntermissionRefdef

==================
*/
void V_CalcIntermissionRefdef (void)
{
	entity_t	*ent, *view;
	float		old;

// ent is the player model (visible when out of body)
	ent = &cl_entities[cl.viewentity];
// view is the weapon model (only visible from inside body)
	view = &cl.viewent;

	VectorCopy (ent->origin, r_refdef.vieworg);
	VectorCopy (ent->angles, r_refdef.viewangles);
	view->model = NULL;

// allways idle in intermission
	old = v_idlescale->value;
	Cvar_SetValue (v_idlescale, 1);
	V_AddIdle ();
	Cvar_SetValue (v_idlescale, old);
}

/*
==================
V_CalcRefdef

==================
*/
void V_CalcRefdef (void)
{
	entity_t	*ent, *view;
	int			i;
	vec3_t		forward, right, up;
	vec3_t		angles;
	float		bob;
	static float oldz = 0;

	V_DriftPitch ();

// ent is the player model (visible when out of body)
	ent = &cl_entities[cl.viewentity];
// view is the weapon model (only visible from inside body)
	view = &cl.viewent;
	

// transform the view offset by the model's matrix to get the offset from
// model origin for the view
	ent->angles[YAW] = cl.viewangles[YAW];	// the model should face
										// the view dir
	ent->angles[PITCH] = -cl.viewangles[PITCH];	// the model should face
										// the view dir
										
	
	bob = V_CalcBob ();
	
// refresh position
	VectorCopy (ent->origin, r_refdef.vieworg);
	r_refdef.vieworg[2] += cl.viewheight + bob;

// never let it sit exactly on a node line, because a water plane can
// dissapear when viewed with the eye exactly on it.
// the server protocol only specifies to 1/16 pixel, so add 1/32 in each axis
	r_refdef.vieworg[0] += 1.0/32;
	r_refdef.vieworg[1] += 1.0/32;
	r_refdef.vieworg[2] += 1.0/32;

	VectorCopy (cl.viewangles, r_refdef.viewangles);
	V_CalcViewRoll ();
	V_AddIdle ();

// offsets
	angles[PITCH] = -ent->angles[PITCH];	// because entity pitches are
											//  actually backward
	angles[YAW] = ent->angles[YAW];
	angles[ROLL] = ent->angles[ROLL];

	AngleVectors (angles, forward, right, up);

	for (i=0 ; i<3 ; i++)
		r_refdef.vieworg[i] += scr_ofsx->value*forward[i]
			+ scr_ofsy->value*right[i]
			+ scr_ofsz->value*up[i];
	
	
	V_BoundOffsets ();
		
// set up gun position
	VectorCopy (cl.viewangles, view->angles);
	
	CalcGunAngle ();

	VectorCopy (ent->origin, view->origin);
	view->origin[2] += cl.viewheight;

	for (i=0 ; i<3 ; i++)
	{
		view->origin[i] += forward[i]*bob*0.4;
//		view->origin[i] += right[i]*bob*0.4;
//		view->origin[i] += up[i]*bob*0.8;
	}
	view->origin[2] += bob;

// fudge position around to keep amount of weapon visible
// roughly equal with different FOV

#if 0
	if (cl.model_precache[cl.stats[STAT_WEAPON]] && strcmp (cl.model_precache[cl.stats[STAT_WEAPON]]->name,  "progs/v_shot2.mdl"))
#endif
	if (cl_sbar->int_val == 0 &&scr_viewsize->int_val >= 100)
		;
	else if (scr_viewsize->int_val == 110)
		view->origin[2] += 1;
	else if (scr_viewsize->int_val == 100)
		view->origin[2] += 2;
	else if (scr_viewsize->int_val == 90)
		view->origin[2] += 1;
	else if (scr_viewsize->int_val == 80)
		view->origin[2] += 0.5;
	
	view->model = cl.model_precache[cl.stats[STAT_WEAPON]];
	view->frame = cl.stats[STAT_WEAPONFRAME];
	view->colormap = vid.colormap;

// set up the refresh position
	VectorAdd (r_refdef.viewangles, cl.punchangle, r_refdef.viewangles);

// smooth out stair step ups
if (cl.onground && ent->origin[2] - oldz > 0)
{
	float steptime;
	
	steptime = cl.time - cl.oldtime;
	if (steptime < 0)
//FIXME		I_Error ("steptime < 0");
		steptime = 0;

	oldz += steptime * 80;
	if (oldz > ent->origin[2])
		oldz = ent->origin[2];
	if (ent->origin[2] - oldz > 12)
		oldz = ent->origin[2] - 12;
	r_refdef.vieworg[2] += oldz - ent->origin[2];
	view->origin[2] += oldz - ent->origin[2];
}
else
	oldz = ent->origin[2];

	if (chase_active->int_val)
		Chase_Update ();
}

/*
==================
V_RenderView

The player's clipping box goes from (-16 -16 -24) to (16 16 32) from
the entity origin, so any view position inside that will be valid
==================
*/
extern vrect_t	scr_vrect;

//============================================================================

/*
=============
V_Init
=============
*/
void V_Init (void)
{
	Cmd_AddCommand ("v_cshift", V_cshift_f, "No Description");	
	Cmd_AddCommand ("bf", V_BonusFlash_f, "No Description");
	Cmd_AddCommand ("centerview", V_StartPitchDrift, "No Description");

	v_centermove = Cvar_Get("v_centermove", "0.15", CVAR_NONE, "None");
	v_centerspeed = Cvar_Get("v_centerspeed", "500", CVAR_NONE, "None");

	v_iyaw_cycle = Cvar_Get("v_iyaw_cycle", "2", CVAR_NONE, "None");
	v_iroll_cycle = Cvar_Get("v_iroll_cycle", "0.5", CVAR_NONE, "None");
	v_ipitch_cycle = Cvar_Get("v_ipitch_cycle", "1", CVAR_NONE, "None");
	v_iyaw_level = Cvar_Get("v_iyaw_level", "0.3", CVAR_NONE, "None");
	v_iroll_level = Cvar_Get("v_iroll_level", "0.1", CVAR_NONE, "None");
	v_ipitch_level = Cvar_Get("v_ipitch_level", "0.3", CVAR_NONE, "None");

	v_idlescale = Cvar_Get("v_idlescale", "0", CVAR_NONE, "None");
	crosshair = Cvar_Get("crosshair", "0", CVAR_ARCHIVE, "None");
	crosshaircolor = Cvar_Get("crosshaircolor",  "79", CVAR_ARCHIVE, "None");
	cl_crossx = Cvar_Get("cl_crossx", "0", CVAR_NONE, "None");
	cl_crossy = Cvar_Get("cl_crossy", "0", CVAR_NONE, "None");
	gl_cshiftpercent = Cvar_Get("gl_cshiftpercent", "100", CVAR_NONE, "None");

	scr_ofsx = Cvar_Get("scr_ofsx", "0", CVAR_NONE, "None");
	scr_ofsy = Cvar_Get("scr_ofsy", "0", CVAR_NONE, "None");
	scr_ofsz = Cvar_Get("scr_ofsz", "0", CVAR_NONE, "None");
	cl_rollspeed = Cvar_Get("cl_rollspeed", "200", CVAR_NONE, "None");
	cl_rollangle = Cvar_Get("cl_rollangle", "2.0", CVAR_NONE, "None");
	cl_bob = Cvar_Get("cl_bob", "0.02", CVAR_NONE, "None");
	cl_bobcycle = Cvar_Get("cl_bobcycle", "0.6", CVAR_NONE, "None");
	cl_bobup = Cvar_Get("cl_bobup", "0.5", CVAR_NONE, "None");

	v_kicktime = Cvar_Get("v_kicktime", "0.5", CVAR_NONE, "None");
	v_kickroll = Cvar_Get("v_kickroll", "0.6", CVAR_NONE, "None");
	v_kickpitch = Cvar_Get("v_kickpitch", "0.6", CVAR_NONE, "None");
	
	BuildGammaTable (1.0, 1.0);	// no gamma yet
	brightness = Cvar_Get("brightness",  "1", CVAR_ARCHIVE, "None");
	contrast = Cvar_Get("contrast",  "1", CVAR_ARCHIVE, "None");
}