[Tutorial PSP/PC] - DP_SV_NODRAWTOCLIENT & DP_SV_DRAWONL

[Team Xlink]

DP_SV_NODRAWTOCLIENT and DP_SV_DRAWONLYTOCLIENT are very useful, they have a wide array of possibilities, and implementing them is very easy.


[Tutorial]

Step 1.

Open up progs.h and add this under the edict_t/s struct.

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extern int eval_drawonlytoclient; //DP_SV_DRAWONLYTOCLIENT
extern int eval_nodrawtoclient; //DP_SV_NODRAWTOCLIENT
#define GETEDICTFIELDVALUE(ed, fieldoffset) (fieldoffset ? (eval_t*)((char*)&ed->v + fieldoffset) : NULL) //DP_SV_DRAWONLYTOCLIENT & DP_SV_NODRAWTOCLIENT

Step 2.

Open up pr_edict.c, after ED_FindFeild add this:

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int eval_nodrawtoclient; //DP_SV_NODRAWTOCLIENT
int eval_drawonlytoclient; //DP_SV_DRAWONLYTOCLIENT

//DP_SV_DRAWONLYTOCLIENT & DP_SV_NODRAWTOCLIENT Start
int FindFieldOffset(char *field)
{
   ddef_t *d;
   d = ED_FindField(field);
   if (!d)
      return 0;
   return d->ofs*4;
}

void FindEdictFieldOffsets()
{
   eval_nodrawtoclient      = FindFieldOffset("nodrawtoclient");
   eval_drawonlytoclient   = FindFieldOffset("drawonlytoclient");
};

//DP_SV_DRAWONLYTOCLIENT & DP_SV_NODRAWTOCLIENT End

Step 3.

Open up quakedef.h and at the end of the entity_state_t struct add this:

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   unsigned short nodrawtoclient; //DP_SV_NODRAWTOCLIENT
   unsigned short drawonlytoclient; //DP_SV_DRAWONLYTOCLIENT

Step 4.

Open up sv_main.c, add this at the end of the starting declarations in SV_WriteEntitiesToClient.

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   int clentnum; //DP_SV_DRAWONLYTOCLIENT & DP_SV_NODRAWTOCLIENT
   eval_t *val; //DP_SV_DRAWONLYTOCLIENT & DP_SV_NODRAWTOCLIENT

Step 5.

In SV_WriteEntitiesToClient after this:

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// find the client's PVS
   VectorAdd (clent->v.origin, clent->v.view_ofs, org);
   pvs = SV_FatPVS (org);

Add this:

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   clentnum = EDICT_TO_PROG(clent); // LordHavoc: for comparison purposes //DP_SV_DRAWONLYTOCLIENT & DP_SV_NODRAWTOCLIENT


Step 6.

In the same function after:

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// ignore ents without visible models
         if (!ent->v.modelindex || !pr_strings[ent->v.model])
            continue;

Add this:

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         //DP_SV_DRAWONLYTOCLIENT & DP_SV_NODRAWTOCLIENT Start
         if ((val = GETEDICTFIELDVALUE(ent, eval_drawonlytoclient)) && val->edict && val->edict != clentnum)
            continue;
            
         if ((val = GETEDICTFIELDVALUE(ent, eval_nodrawtoclient)) && val->edict == clentnum)
            continue;
         //DP_SV_DRAWONLYTOCLIENT & DP_SV_NODRAWTOCLIENT End

That should be all thats required.

**NOTICE**
This tutorial doesn't cover DPCHECKEXTENSIONS, I needed just these to DP_Extensions in my engine and didn't require the ability to check them, considering my engine is just for my own education ,experimentation and creation. It should be pretty straightforward on implementing it.

EDIT August 12th, 2010
I fixed some typos and formatting errors.

EDIT: September 20th, 2013
*Removed shameful self plugs

[qbism]

Tutorial worked well, used it to see OrionTF vwep support correctly.

If the engine already has dpextensions, just go to char *pr_extensions[] in pr_cmds.c and add "DP_SV_NODRAWTOCLIENT" and "DP_SV_DRAWONLYTOCLIENT"

[Team Xlink]

Yeah it worked!

The lack of other confirmation had me worried that I missed something in the tutorial, because I attempted to implement it in an engine that wasn't standard and it worked, so I tutorialized it from the engine I implemented it in.

[drm_wayne]

Sorry for bumping this but it seems not to work with Kurok engine...
I added everything and it compiled fine but i can still see all the stuff -.-

In Darkplaces everything works fine but not with your stuff...

[Spike]

its the last part that contains the 'magic'.

[drm_wayne]

Wrong, i even tested a Kurokbuild where HE added that stuff and Drawonlytoclient DOESNT work...

[Spike]

Not wrong at all. step 6 IS the part that contains the logic that is the whole point of the two extensions.
If you actually stop to figure out what's actually happening, you might manage to see what's not happening.

Yes, it lacks a single instruction, literally. Yay for branches.
Without that instruction, its all dead code.
Have fun trying to find it.

[drm_wayne]

i dont get it...

everybody wrote above YAY IT WORKED but its not working...
But well, i dont expect getting help here, PSP Quakers are not really welcome here...

[drm_wayne]

To get this to work add this in pr_edict.c at the end of the
PR_LoadProgs function:

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FindEdictFieldOffsets (); // The stuff Team Xlink forget to add... Shame on you xD


[qbism]

I didn't run into that, never knew why until now. This tutorial must be for a non-vanilla GetEdictFieldValue? Vanilla passes string, like GetEdictFieldValue(ent, "drawonlytoclient")) and the workaround isn't needed. Vanilla:

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eval_t *GetEdictFieldValue(edict_t *ed, char *field)
{
    ddef_t         *def = NULL;
    int            i;
    static int      rep = 0;

    for (i=0 ; i<GEFV_CACHESIZE ; i++)
    {
        if (!Q_strcmp(field, gefvCache[i].field))
        {
            def = gefvCache[i].pcache;
            goto Done;
        }
    }

    def = ED_FindField (field);

    if (Q_strlen(field) < MAX_FIELD_LEN)
    {
        gefvCache[rep].pcache = def;
        Q_strcpy (gefvCache[rep].field, field);
        rep ^= 1;
    }

Done:
    if (!def)
        return NULL;

    return (eval_t *)((char *)&ed->v + def->ofs*4);
}

[drm_wayne]

Its for the PSP Kurok engine (and all other similar ones)...
I mainly needed it for 3rd person weapons and 1st person legs:

[qbism]

The legs are cool. Qfusion was the first time I saw that effect. It uses the lower body from md3 models.

[leileilol]

First time I saw first-person legs was Montezuma's Return!
Soon after we saw first-person breasts in Trespasser, rarely ever seen again, and they were vital for having a health meter TATOO

[ceriux]

i sucked at trespasser -.-