API: Add new natives rg_trace_line and rg_trace_hull

[GLoOoccK]

Purpose

Enable TraceLine and TraceHull to penetrate through teammates, since it is currently not possible to modify the value of gpGlobals->trace_flags using any native available in AMX Mod X.

rehlds/ReGameDLL_CS#813

https://github.com/alliedmodders/amxmodx/blob/master/modules/fakemeta/glb.cpp#L186-L190
https://github.com/alliedmodders/amxmodx/blob/master/modules/engine/globals.cpp#L186-L195

Approach

This change is made possible by the addition of support for gpGlobals->trace_flags.

Open Questions and Pre-Merge TODOs

rehlds/ReHLDS#951 (comment)

Learning

https://github.com/rehlds/ReGameDLL_CS/blob/master/regamedll/dlls/cbase.cpp#L1368-L1371
https://github.com/rehlds/ReGameDLL_CS/blob/master/regamedll/dlls/combat.cpp#L44-L47
https://github.com/rehlds/ReGameDLL_CS/blob/master/regamedll/dlls/wpn_shared/wpn_knife.cpp#L132-L135
https://github.com/rehlds/ReGameDLL_CS/blob/master/regamedll/dlls/wpn_shared/wpn_knife.cpp#L290-L297

[justgo97]

Good addition

A quick example of an implementation:

#define FTRACE_TEAM				(1<<19)
#define FTRACE_ENEMY				(1<<20)

rg_trace_line(..., FTRACE_ENEMY)

public FMHook_ShouldCollide(entTouched, entOther) {

    ...

    if (isSameTeam(entTouched, entOther)) {
        if(global_get(glb_trace_flags) & FTRACE_ENEMY) {
                forward_return(FMV_CELL, 0)
                return FMRES_SUPERCEDE
        }
    } else {
        if(global_get(glb_trace_flags) & FTRACE_TEAM) {
                forward_return(FMV_CELL, 0)
                return FMRES_SUPERCEDE
        }
    }

    return FMRES_IGNORED
}

[dystopm]

Good addition

A quick example of an implementation:

#define FTRACE_TEAM				(1<<19)
#define FTRACE_ENEMY				(1<<20)

rg_trace_line(..., FTRACE_ENEMY)

public FMHook_ShouldCollide(entTouched, entOther) {

    ...

    if (isSameTeam(entTouched, entOther)) {
        if(global_get(glb_trace_flags) & FTRACE_ENEMY) {
                forward_return(FMV_CELL, 0)
                return FMRES_SUPERCEDE
        }
    } else {
        if(global_get(glb_trace_flags) & FTRACE_TEAM) {
                forward_return(FMV_CELL, 0)
                return FMRES_SUPERCEDE
        }
    }

    return FMRES_IGNORED
}

You can consider add this in regamedll logic, since using an amxx script for this can be CPU consuming

[dystopm]

Now this should work without issues when having fun module activated. alliedmodders/amxmodx#1127