newtree/source/r_view.c

/*
	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

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

#include "quakedef.h"
#include "r_local.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	lcd_x = {"lcd_x", "0"};	// FIXME: make this work sometime...

cvar_t	cl_rollspeed = {"cl_rollspeed", "200"};
cvar_t	cl_rollangle = {"cl_rollangle", "2.0"};

cvar_t	cl_bob = {"cl_bob","0.02", false};
cvar_t	cl_bobcycle = {"cl_bobcycle","0.6", false};
cvar_t	cl_bobup = {"cl_bobup","0.5", false};

cvar_t	v_kicktime = {"v_kicktime", "0.5", false};
cvar_t	v_kickroll = {"v_kickroll", "0.6", false};
cvar_t	v_kickpitch = {"v_kickpitch", "0.6", false};

cvar_t	v_iyaw_cycle = {"v_iyaw_cycle", "2", false};
cvar_t	v_iroll_cycle = {"v_iroll_cycle", "0.5", false};
cvar_t	v_ipitch_cycle = {"v_ipitch_cycle", "1", false};
cvar_t	v_iyaw_level = {"v_iyaw_level", "0.3", false};
cvar_t	v_iroll_level = {"v_iroll_level", "0.1", false};
cvar_t	v_ipitch_level = {"v_ipitch_level", "0.3", false};

cvar_t	v_idlescale = {"v_idlescale", "0", false};

cvar_t	crosshair = {"crosshair", "0", true};
cvar_t	crosshaircolor = {"crosshaircolor", "79", true};

cvar_t  cl_crossx = {"cl_crossx", "0", true};
cvar_t  cl_crossy = {"cl_crossy", "0", true};

cvar_t  v_contentblend = {"v_contentblend", "1", false};

float	v_dmg_time, v_dmg_roll, v_dmg_pitch;

extern	int			in_forward, in_forward2, in_back;

frame_t		*view_frame;
player_state_t		*view_message;

/*
===============
V_CalcRoll

===============
*/
float V_CalcRoll (vec3_t angles, vec3_t velocity)
{
	vec3_t	forward, right, up;
	float	sign;
	float	side;
	float	value;
	
	AngleVectors (angles, forward, right, up);
	side = DotProduct (velocity, right);
	sign = side < 0 ? -1 : 1;
	side = fabs(side);
	
	value = cl_rollangle.value;

	if (side < cl_rollspeed.value)
		side = side * value / cl_rollspeed.value;
	else
		side = value;
	
	return side*sign;
	
}


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

===============
*/
float V_CalcBob (void)
{
	static	double	bobtime;
	static float	bob;
	float	cycle;
	
	if (cl.spectator)
		return 0;

	if (onground == -1)
		return bob;		// just use old value

	bobtime += host_frametime;
	cycle = bobtime - (int)(bobtime/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 simulated velocity in the xy plane
// (don't count Z, or jumping messes it up)

	bob = sqrt(cl.simvel[0]*cl.simvel[0] + cl.simvel[1]*cl.simvel[1]) * cl_bob.value;
	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 = {"v_centermove", "0.15", false};
cvar_t	v_centerspeed = {"v_centerspeed","500"};


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 (view_message->onground == -1 || cls.demoplayback )
	{
		cl.driftmove = 0;
		cl.pitchvel = 0;
		return;
	}

// don't count small mouse motion
	if (cl.nodrift)
	{
		if ( fabs(cl.frames[(cls.netchan.outgoing_sequence-1)&UPDATE_MASK].cmd.forwardmove) < 200)
			cl.driftmove = 0;
		else
			cl.driftmove += host_frametime;
	
		if ( cl.driftmove > v_centermove.value)
		{
			V_StartPitchDrift ();
		}
		return;
	}
	
	delta = 0 - 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 = {"gamma", "1", true};

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


void BuildGammaTable (float g)
{
	int		i, inf;
	
	if (g == 1.0)
	{
		for (i=0 ; i<256 ; i++)
			gammatable[i] = i;
		return;
	}
	
	for (i=0 ; i<256 ; i++)
	{
		inf = 255 * pow ( (i+0.5)/255.5 , g ) + 0.5;
		if (inf < 0)
			inf = 0;
		if (inf > 255)
			inf = 255;
		gammatable[i] = inf;
	}
}

/*
=================
V_CheckGamma
=================
*/
qboolean V_CheckGamma (void)
{
	static float oldgammavalue;
	
	if (v_gamma.value == oldgammavalue)
		return false;
	oldgammavalue = v_gamma.value;
	
	BuildGammaTable (v_gamma.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;
	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
//
	VectorSubtract (from, cl.simorg, from);
	VectorNormalize (from);
	
	AngleVectors (cl.simangles, 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)
{
	if (!v_contentblend.value) {
		cl.cshifts[CSHIFT_CONTENTS] = cshift_empty;
		return;
	}

	switch (contents)
	{
	case CONTENTS_EMPTY:
		cl.cshifts[CSHIFT_CONTENTS] = cshift_empty;
		break;
	case CONTENTS_LAVA:
		cl.cshifts[CSHIFT_CONTENTS] = cshift_lava;
		break;
	case CONTENTS_SOLID:
	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.stats[STAT_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.stats[STAT_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.stats[STAT_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.stats[STAT_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);
}

/*
==============
V_BoundOffsets
==============
*/
void V_BoundOffsets (void)
{
// absolutely bound refresh reletive to entity clipping hull
// so the view can never be inside a solid wall

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

	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_CalcViewRoll

Roll is induced by movement and damage
==============
*/
void V_CalcViewRoll (void)
{
	float		side;
		
	side = V_CalcRoll (cl.simangles, cl.simvel);
	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;
	}

}


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

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

// view is the weapon model
	view = &cl.viewent;

	VectorCopy (cl.simorg, r_refdef.vieworg);
	VectorCopy (cl.simangles, r_refdef.viewangles);
	view->model = NULL;

// allways idle in intermission
	old = v_idlescale.value;
	v_idlescale.value = 1;
	V_AddIdle ();
	v_idlescale.value = old;
}

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

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

	V_DriftPitch ();

// view is the weapon model (only visible from inside body)
	view = &cl.viewent;

	bob = V_CalcBob ();
	
// refresh position from simulated origin
	VectorCopy (cl.simorg, r_refdef.vieworg);

	r_refdef.vieworg[2] += 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 1/8 pixel, so add 1/16 in each axis
	r_refdef.vieworg[0] += 1.0/16;
	r_refdef.vieworg[1] += 1.0/16;
	r_refdef.vieworg[2] += 1.0/16;

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

	if (view_message->flags & PF_GIB)
		r_refdef.vieworg[2] += 8;	// gib view height
	else if (view_message->flags & PF_DEAD)
		r_refdef.vieworg[2] -= 16;	// corpse view height
	else
		r_refdef.vieworg[2] += 22;	// view height

	if (view_message->flags & PF_DEAD)		// PF_GIB will also set PF_DEAD
		r_refdef.viewangles[ROLL] = 80;	// dead view angle


// offsets
	AngleVectors (cl.simangles, forward, right, up);
	
// set up gun position
	VectorCopy (cl.simangles, view->angles);
	
	CalcGunAngle ();

	VectorCopy (cl.simorg, view->origin);
	view->origin[2] += 22;

	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 (scr_viewsize.value == 110)
		view->origin[2] += 1;
	else if (scr_viewsize.value == 100)
		view->origin[2] += 2;
	else if (scr_viewsize.value == 90)
		view->origin[2] += 1;
	else if (scr_viewsize.value == 80)
		view->origin[2] += 0.5;

	if (view_message->flags & (PF_GIB|PF_DEAD) )
 		view->model = NULL;
 	else
		view->model = cl.model_precache[cl.stats[STAT_WEAPON]];
	view->frame = view_message->weaponframe;
	view->colormap = vid.colormap;

// set up the refresh position
	r_refdef.viewangles[PITCH] += cl.punchangle;

// smooth out stair step ups
	if ( (view_message->onground != -1) && (cl.simorg[2] - oldz > 0) )
	{
		float steptime;
		
		steptime = host_frametime;
	
		oldz += steptime * 80;
		if (oldz > cl.simorg[2])
			oldz = cl.simorg[2];
		if (cl.simorg[2] - oldz > 12)
			oldz = cl.simorg[2] - 12;
		r_refdef.vieworg[2] += oldz - cl.simorg[2];
		view->origin[2] += oldz - cl.simorg[2];
	}
	else
		oldz = cl.simorg[2];
}

/*
=============
DropPunchAngle
=============
*/
void DropPunchAngle (void)
{
	cl.punchangle -= 10*host_frametime;
	if (cl.punchangle < 0)
		cl.punchangle = 0;
}

/*
==================
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;

void V_RenderView (void)
{
//	if (cl.simangles[ROLL])
//		Sys_Error ("cl.simangles[ROLL]");	// DEBUG
cl.simangles[ROLL] = 0;	// FIXME @@@ 

	if (cls.state != ca_active)
		return;

	view_frame = &cl.frames[cls.netchan.incoming_sequence & UPDATE_MASK];
	view_message = &view_frame->playerstate[cl.playernum];

	DropPunchAngle ();
	if (cl.intermission)
	{	// intermission / finale rendering
		V_CalcIntermissionRefdef ();	
	}
	else
	{
		V_CalcRefdef ();
	}

	R_PushDlights ();
	R_RenderView ();

	if (crosshair.value)
		Draw_Crosshair ();
}

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

/*
=============
V_Init
=============
*/
void V_Init (void)
{
	Cmd_AddCommand ("v_cshift", V_cshift_f);	
	Cmd_AddCommand ("bf", V_BonusFlash_f);
	Cmd_AddCommand ("centerview", V_StartPitchDrift);

	Cvar_RegisterVariable (&v_centermove);
	Cvar_RegisterVariable (&v_centerspeed);

	Cvar_RegisterVariable (&v_iyaw_cycle);
	Cvar_RegisterVariable (&v_iroll_cycle);
	Cvar_RegisterVariable (&v_ipitch_cycle);
	Cvar_RegisterVariable (&v_iyaw_level);
	Cvar_RegisterVariable (&v_iroll_level);
	Cvar_RegisterVariable (&v_ipitch_level);

	Cvar_RegisterVariable (&v_contentblend);

	Cvar_RegisterVariable (&v_idlescale);
	Cvar_RegisterVariable (&crosshaircolor);
	Cvar_RegisterVariable (&crosshair);
	Cvar_RegisterVariable (&cl_crossx);
	Cvar_RegisterVariable (&cl_crossy);

	Cvar_RegisterVariable (&cl_rollspeed);
	Cvar_RegisterVariable (&cl_rollangle);
	Cvar_RegisterVariable (&cl_bob);
	Cvar_RegisterVariable (&cl_bobcycle);
	Cvar_RegisterVariable (&cl_bobup);

	Cvar_RegisterVariable (&v_kicktime);
	Cvar_RegisterVariable (&v_kickroll);
	Cvar_RegisterVariable (&v_kickpitch);	

	BuildGammaTable (1.0);	// no gamma yet
	Cvar_RegisterVariable (&v_gamma);
}