cl_input.cpp

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

 */
// cl.input.c  -- builds an intended movement command to send to the server

// Quake is a trademark of Id Software, Inc., (c) 1996 Id Software, Inc. All
// rights reserved.

#include "quakedef.h"

/*
===============================================================================
KEY BUTTONS

Continuous button event tracking is complicated by the fact that two different
input sources (say, mouse button 1 and the control key) can both press the
same button, but the button should only be released when both of the
pressing key have been released.

When a key event issues a button command (+forward, +attack, etc), it appends
its key number as a parameter to the command so it can be matched up with
the release.

state bit 0 is the current state of the key
state bit 1 is edge triggered on the up to down transition
state bit 2 is edge triggered on the down to up transition
===============================================================================
 */

kbutton_t in_klook;
kbutton_t in_left, in_right, in_forward, in_back;
kbutton_t in_lookup, in_lookdown, in_moveleft, in_moveright;
kbutton_t in_strafe, in_speed, in_use, in_jump, in_attack;
kbutton_t in_up, in_down;

int in_impulse;

void KeyDown(kbutton_t *b) {
	int k;
	const char *c;

	c = CmdArgs::getArg(1);
	if (c[0])
		k = atoi(c);
	else
		k = -1; // typed manually at the console for continuous down

	if (k == b->down[0] || k == b->down[1])
		return; // repeating key

	if (!b->down[0])
		b->down[0] = k;
	else if (!b->down[1])
		b->down[1] = k;
	else {
		Con_Printf("Three keys down for a button!\n");
		return;
	}

	if (b->state & 1)
		return; // still down
	b->state |= 1 + 2; // down + impulse down
}

void KeyUp(kbutton_t *b) {
	int k;
	const char *c;

	c = CmdArgs::getArg(1);
	if (c[0])
		k = atoi(c);
	else { // typed manually at the console, assume for unsticking, so clear all
		b->down[0] = b->down[1] = 0;
		b->state = 4; // impulse up
		return;
	}

	if (b->down[0] == k)
		b->down[0] = 0;
	else if (b->down[1] == k)
		b->down[1] = 0;
	else
		return; // key up without coresponding down (menu pass through)
	if (b->down[0] || b->down[1])
		return; // some other key is still holding it down

	if (!(b->state & 1))
		return; // still up (this should not happen)
	b->state &= ~1; // now up
	b->state |= 4; // impulse up
}

void IN_KLookDown(void) {
	KeyDown(&in_klook);
}

void IN_KLookUp(void) {
	KeyUp(&in_klook);
}

void IN_UpDown(void) {
	KeyDown(&in_up);
}

void IN_UpUp(void) {
	KeyUp(&in_up);
}

void IN_DownDown(void) {
	KeyDown(&in_down);
}

void IN_DownUp(void) {
	KeyUp(&in_down);
}

void IN_LeftDown(void) {
	KeyDown(&in_left);
}

void IN_LeftUp(void) {
	KeyUp(&in_left);
}

void IN_RightDown(void) {
	KeyDown(&in_right);
}

void IN_RightUp(void) {
	KeyUp(&in_right);
}

void IN_ForwardDown(void) {
	KeyDown(&in_forward);
}

void IN_ForwardUp(void) {
	KeyUp(&in_forward);
}

void IN_BackDown(void) {
	KeyDown(&in_back);
}

void IN_BackUp(void) {
	KeyUp(&in_back);
}

void IN_LookupDown(void) {
	KeyDown(&in_lookup);
}

void IN_LookupUp(void) {
	KeyUp(&in_lookup);
}

void IN_LookdownDown(void) {
	KeyDown(&in_lookdown);
}

void IN_LookdownUp(void) {
	KeyUp(&in_lookdown);
}

void IN_MoveleftDown(void) {
	KeyDown(&in_moveleft);
}

void IN_MoveleftUp(void) {
	KeyUp(&in_moveleft);
}

void IN_MoverightDown(void) {
	KeyDown(&in_moveright);
}

void IN_MoverightUp(void) {
	KeyUp(&in_moveright);
}

void IN_SpeedDown(void) {
	KeyDown(&in_speed);
}

void IN_SpeedUp(void) {
	KeyUp(&in_speed);
}

void IN_StrafeDown(void) {
	KeyDown(&in_strafe);
}

void IN_StrafeUp(void) {
	KeyUp(&in_strafe);
}

void IN_AttackDown(void) {
	KeyDown(&in_attack);
}

void IN_AttackUp(void) {
	KeyUp(&in_attack);
}

void IN_UseDown(void) {
	KeyDown(&in_use);
}

void IN_UseUp(void) {
	KeyUp(&in_use);
}

void IN_JumpDown(void) {
	KeyDown(&in_jump);
}

void IN_JumpUp(void) {
	KeyUp(&in_jump);
}

void IN_Impulse(void) {
	in_impulse = atoi(CmdArgs::getArg(1));
}

/**
 * Returns 0.25 if a key was pressed and released during the frame,
 * 0.5 if it was pressed and held
 * 0 if held then released, and
 * 1.0 if held for the entire time
 */
float CL_KeyState(kbutton_t *key) {
	float val;
	bool impulsedown, impulseup, down;

	impulsedown = key->state & 2;
	impulseup = key->state & 4;
	down = key->state & 1;
	val = 0;

	if (impulsedown && !impulseup) {
		if (down) {
			val = 0.5; // pressed and held this frame
		} else {
			val = 0; //	I_Error ();
		}
	}
	if (impulseup && !impulsedown) {
		if (down) {
			val = 0; //	I_Error ();
		} else {
			val = 0; // released this frame
		}
	}
	if (!impulsedown && !impulseup) {
		if (down) {
			val = 1.0; // held the entire frame
		} else {
			val = 0; // up the entire frame
		}
	}
	if (impulsedown && impulseup) {
		if (down) {
			val = 0.75; // released and re-pressed this frame
		} else {
			val = 0.25; // pressed and released this frame
		}
	}
	key->state &= 1; // clear impulses

	return val;
}

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

CVar cl_upspeed("cl_upspeed", "200");
CVar cl_forwardspeed("cl_forwardspeed", "200", true);
CVar cl_backspeed("cl_backspeed", "200", true);
CVar cl_sidespeed("cl_sidespeed", "350");
CVar cl_movespeedkey("cl_movespeedkey", "2.0");
CVar cl_yawspeed("cl_yawspeed", "140");
CVar cl_pitchspeed("cl_pitchspeed", "150");
CVar cl_anglespeedkey("cl_anglespeedkey", "1.5");
CVar in_mlook("in_mlook", "1", true);

/**
 * Moves the local angle positions
 */
void CL_AdjustAngles(void) {
	float speed;
	float up, down;

	if (in_speed.state & 1)
		speed = host_frametime * cl_anglespeedkey.getFloat();
	else
		speed = host_frametime;

	if (!(in_strafe.state & 1)) {
		cl.viewangles[YAW] -= speed * cl_yawspeed.getFloat() * CL_KeyState(&in_right);
		cl.viewangles[YAW] += speed * cl_yawspeed.getFloat() * CL_KeyState(&in_left);
		cl.viewangles[YAW] = anglemod(cl.viewangles[YAW]);
	}
	if (in_klook.state & 1) {
		V_StopPitchDrift();
		cl.viewangles[PITCH] -= speed * cl_pitchspeed.getFloat() * CL_KeyState(&in_forward);
		cl.viewangles[PITCH] += speed * cl_pitchspeed.getFloat() * CL_KeyState(&in_back);
	}

	up = CL_KeyState(&in_lookup);
	down = CL_KeyState(&in_lookdown);
	cl.viewangles[PITCH] -= speed * cl_pitchspeed.getFloat() * up;
	cl.viewangles[PITCH] += speed * cl_pitchspeed.getFloat() * down;

	if (up || down)
		V_StopPitchDrift();

	if (cl.viewangles[PITCH] > 80)
		cl.viewangles[PITCH] = 80;
	if (cl.viewangles[PITCH] < -70)
		cl.viewangles[PITCH] = -70;

	if (cl.viewangles[ROLL] > 50)
		cl.viewangles[ROLL] = 50;
	if (cl.viewangles[ROLL] < -50)
		cl.viewangles[ROLL] = -50;

}

/**
 * Send the intended movement message to the server
 */
void CL_BaseMove(usercmd_t *cmd) {
	if (cls.signon != SIGNONS)
		return;

	CL_AdjustAngles();

	memset(cmd, 0, sizeof (*cmd));

	if (in_strafe.state & 1) {
		cmd->sidemove += cl_sidespeed.getFloat() * CL_KeyState(&in_right);
		cmd->sidemove -= cl_sidespeed.getFloat() * CL_KeyState(&in_left);
	}

	cmd->sidemove += cl_sidespeed.getFloat() * CL_KeyState(&in_moveright);
	cmd->sidemove -= cl_sidespeed.getFloat() * CL_KeyState(&in_moveleft);

	cmd->upmove += cl_upspeed.getFloat() * CL_KeyState(&in_up);
	cmd->upmove -= cl_upspeed.getFloat() * CL_KeyState(&in_down);

	if (!(in_klook.state & 1)) {
		cmd->forwardmove += cl_forwardspeed.getFloat() * CL_KeyState(&in_forward);
		cmd->forwardmove -= cl_backspeed.getFloat() * CL_KeyState(&in_back);
	}

	// adjust for speed key
	if (in_speed.state & 1) {
		cmd->forwardmove *= cl_movespeedkey.getFloat();
		cmd->sidemove *= cl_movespeedkey.getFloat();
		cmd->upmove *= cl_movespeedkey.getFloat();
	}
}

void CL_SendMove(usercmd_t *cmd) {
	int i;
	int bits;
	sizebuf_t buf;
	byte data[128];

	buf.maxsize = 128;
	buf.cursize = 0;
	buf.data = data;

	cl.alias = *cmd;

	// send the movement message
	MSG_WriteByte(&buf, clc_move);

	MSG_WriteFloat(&buf, cl.mtime[0]); // so server can get ping times

	for (i = 0; i < 3; i++)
		MSG_WriteAngle(&buf, cl.viewangles[i]);

	MSG_WriteShort(&buf, cmd->forwardmove);
	MSG_WriteShort(&buf, cmd->sidemove);
	MSG_WriteShort(&buf, cmd->upmove);

	// send button bits
	bits = 0;

	if (in_attack.state & 3)
		bits |= 1;
	in_attack.state &= ~2;

	if (in_jump.state & 3)
		bits |= 2;
	in_jump.state &= ~2;

	MSG_WriteByte(&buf, bits);

	MSG_WriteByte(&buf, in_impulse);
	in_impulse = 0;

	// deliver the message
	if (cls.demoplayback)
		return;

	// allways dump the first two message, because it may contain leftover inputs
	// from the last level
	if (++cl.movemessages <= 2)
		return;

	if (NET_SendUnreliableMessage(cls.netcon, &buf) == -1) {
		Con_Printf("CL_SendMove: lost server connection\n");
		CL_Disconnect();
	}
}

void CL_InitInput(void) {
	Cmd::addCmd("+moveup", IN_UpDown);
	Cmd::addCmd("-moveup", IN_UpUp);
	Cmd::addCmd("+movedown", IN_DownDown);
	Cmd::addCmd("-movedown", IN_DownUp);
	Cmd::addCmd("+left", IN_LeftDown);
	Cmd::addCmd("-left", IN_LeftUp);
	Cmd::addCmd("+right", IN_RightDown);
	Cmd::addCmd("-right", IN_RightUp);
	Cmd::addCmd("+forward", IN_ForwardDown);
	Cmd::addCmd("-forward", IN_ForwardUp);
	Cmd::addCmd("+back", IN_BackDown);
	Cmd::addCmd("-back", IN_BackUp);
	Cmd::addCmd("+lookup", IN_LookupDown);
	Cmd::addCmd("-lookup", IN_LookupUp);
	Cmd::addCmd("+lookdown", IN_LookdownDown);
	Cmd::addCmd("-lookdown", IN_LookdownUp);
	Cmd::addCmd("+strafe", IN_StrafeDown);
	Cmd::addCmd("-strafe", IN_StrafeUp);
	Cmd::addCmd("+moveleft", IN_MoveleftDown);
	Cmd::addCmd("-moveleft", IN_MoveleftUp);
	Cmd::addCmd("+moveright", IN_MoverightDown);
	Cmd::addCmd("-moveright", IN_MoverightUp);
	Cmd::addCmd("+speed", IN_SpeedDown);
	Cmd::addCmd("-speed", IN_SpeedUp);
	Cmd::addCmd("+attack", IN_AttackDown);
	Cmd::addCmd("-attack", IN_AttackUp);
	Cmd::addCmd("+use", IN_UseDown);
	Cmd::addCmd("-use", IN_UseUp);
	Cmd::addCmd("+jump", IN_JumpDown);
	Cmd::addCmd("-jump", IN_JumpUp);
	Cmd::addCmd("impulse", IN_Impulse);
	Cmd::addCmd("+klook", IN_KLookDown);
	Cmd::addCmd("-klook", IN_KLookUp);
}