[Solved] Forcing run forward (+forward)

Xalus · **Author**

Hello,

For a fun-game I'm working on, I want to force 'run forward' on player.

I don't wanna play with 'velocity' forward, because either way player will fly,
or other functions like jump, crouch, climb ladders wont really work anymore.

so I'm searching a decent way to force a player to "have" +forward activated.
(Without slowhacking ofc)

Thanks in advance,
Xalus.

klippy · 01-31-2018 , 08:14 Re: Forcing run forward (+forward)

Alter player's pev_button to include IN_FORWARD on CmdStart or PlayerPreThink pre-hook.

Xalus · *Last edited by Xalus; 01-31-2018 at 08:32.*

Thanks for your respond,
but after doing some tests..
Player just keeps standing still.

Code:

register_forward(FM_CmdStart, "fwd_CmdStart")

public fwd_CmdStart(client, uc_handle, seed)
{
	if(is_user_alive(client))
	//&& !g_boolSlither)
	{
		new bitButton
		bitButton = get_uc(uc_handle,UC_Buttons)

		if( !(bitButton & IN_FORWARD) )
		{
			set_uc(uc_handle, UC_Buttons, (bitButton | IN_FORWARD))
			//return FMRES_HANDLED
		}
	}
	//return FMRES_IGNORED
}

klippy · *Last edited by klippy; 01-31-2018 at 10:02.*

After some testing and then inspecting some engine code I just found out that you can't change usercmd with set_uc because a copy of it is passed to CmdStart. Look like you can't do much without Orpheu or Okapi.

Also to make them move in certain direction you are supposed to change UC_ForwardMove, UC_SideMove and UC_UpMove, not just set IN_FORWARD.

klippy · *Last edited by klippy; 01-31-2018 at 11:24.*

Alright, here it is.
The thing is that the client is the one that issues movement, meaning that client prediction will always throw this off a bit. However, I made them think they are frozen so they can't create any movement, giving full control to the server. This felt good and precise even with ~50ms ping.
You'll have to provide Windows signatures yourself (or have someone else do it) if you want to run this on Windows. I run Linux and have no access to my Windows PC currently so I am unable to do it.

Useful informaton:
SV_ParseMove - https://github.com/dreamstalker/rehl...user.cpp#L1501
SV_RunCmd - https://github.com/dreamstalker/rehl..._user.cpp#L732

PHP Code:


			
#include <amxmodx>
#include <orpheu>
#include <orpheu_memory>
#include <fakemeta>

#pragma semicolon true


new gForceForward[MAX_PLAYERS + 1];
new gParseMoveClientId;

public plugin_init()
{
    register_plugin("Force +forward", "1.0.0", "KliPPy");

    OrpheuRegisterHook(OrpheuGetFunction("SV_ParseMove"), "@SV_ParseMove", OrpheuHookPre);
    OrpheuRegisterHook(OrpheuGetFunction("SV_RunCmd"), "@SV_RunCmd", OrpheuHookPre);

    register_forward(FM_UpdateClientData, "@UpdateClientData_Post", true);

    register_clcmd("say force", "@ClCmd_Force");
}

public client_connect(playerId)
{
    gForceForward[playerID] = false;
}

static OrpheuHookReturn:@SV_ParseMove(pSenderClient)
{
    gParseMoveClientId = find_player("k", OrpheuMemoryGetAtAddress(pSenderClient, "client_s::userid"));
    return OrpheuIgnored;
}

static OrpheuHookReturn:@SV_RunCmd(pUserCmd, randomSeed)
{
    if(!is_user_alive(gParseMoveClientId) || !gForceForward[gParseMoveClientId])
        return OrpheuIgnored;

    new Float:maxspeed;
    pev(gParseMoveClientId, pev_maxspeed, maxspeed);
    set_uc(pUserCmd, UC_Buttons, get_uc(pUserCmd, UC_Buttons) | IN_FORWARD);
    set_uc(pUserCmd, UC_ForwardMove, maxspeed);
    set_uc(pUserCmd, UC_SideMove, 0.0);
    set_uc(pUserCmd, UC_UpMove, 0.0);

    return OrpheuIgnored;
}

static @UpdateClientData_Post(playerId, sendWeapons, clientData)
{
    if(!is_user_alive(playerId) || !gForceForward[playerId])
        return FMRES_IGNORED;

    set_cd(clientData, CD_Flags, get_cd(clientData, CD_Flags) | FL_FROZEN);

    return FMRES_IGNORED;
}

static @ClCmd_Force(playerId)
{
    gForceForward[playerId] = !gForceForward[playerId];
    client_print(playerId, print_chat, "Forcing +forward: %s", gForceForward[playerId] ? "YES" : "NO");
}

configs/orpheu/functions/SV_ParseMove

Code:

{
    "name": "SV_ParseMove",
    "library": "engine",

    "arguments": [
        {
            "type" : "pointer",
            "info" : "client_t *"
        }
    ],
    
    "identifiers": [
        {
            "os" : "windows",
            "value" : "<signature>"
        },
        {
            "os" : "linux",
            "value" : "SV_ParseMove"
        }
    ]
}

configs/orpheu/functions/SV_RunCmd

Code:

{
    "name": "SV_RunCmd",
    "library": "engine",

    "arguments": [
        {
            "type" : "pointer",
            "info" : "usercmd_t *"
        },
        {
            "type": "int",
            "info": "random_seed"
        }
    ],
    
    "identifiers": [
        {
            "os" : "windows",
            "value" : "<signature>"
        },
        {
            "os" : "linux",
            "value" : "SV_RunCmd"
        }
    ]
}

configs/orpheu/memory/client_s__userid

Code:

[
    {
        "name": "client_s::userid",
        "type": "int",
        "memoryType": "data",
        "identifiers": [
            {
                "os": "windows",
                "value": 19364
            },
            {
                "os": "linux",
                "value": 19084
            }
        ]
    }
]

Xalus · 01-31-2018 , 15:13 Re: Forcing run forward (+forward)

Thanks,
but gonna try and look for a way without Orpheu,

Don't wanna upload such big module for one simple part of a plugin.

klippy · 01-31-2018 , 15:35 Re: Forcing run forward (+forward)

The module is just one file, smaller than 1MB probably. And you just link to it if you publish your plugin.

**HamletEagle** · *Last edited by HamletEagle; 01-31-2018 at 15:53.*

What amazes me is the reply "don't wanna use x for such a small thing". If you see you fail to do it without, and you fail again, and again then the thing it's not that simple, right? Orpheu is made for thins kind of things.