Re: Project Texture Problem

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Marco Tartaglia (marco++at++infobyte.it)
Thu, 18 Jan 1996 12:06:26 +0000

Hi Tom,

probably i'm unlucky today. Thank you for your answer, but the problem is not
solved yet; this is the complete test code so you can better check where is my
problem(s).

Thanks again for any suggestions.

On Jan 18, 12:31am, Tom McReynolds wrote:
> Subject: Re: Project Texture Problem
>
> It's difficult to tell for sure what might be wrong from the program outline
> you've sent, but there's enough there that I'll take a guess, and say you're
> running into a classic Performer programming bug:
>
> When pfConfig() is called, (when you're not running with PFMP_APPCULLDRAW)
> the pipe processes get forked. At fork time, the variables are
> copied. You're correctly creating and setting textures, lights, etc. after
> the pfConfig(), but the copied variables in your other processes don't see
> the changes you've made.
>
> If this is the problem you're seeing, we have a standard way to avoid it:
>
> 1. Declare a structure that contains all the state that needs sharing
> 2. Define a static pointer to that structure
> 3. *Allocate* a structure and set the pointer to its address.
> 4. Now call pfConfig(). The fork will copy the pointer to the structure, so
> all the forked processes can see changes made to the variables in the
> structure.
> 5. Go ahead and create and set things, using the variables in the allocated
> structure.
>
> It's a bit easier to just look at some code. in the sample directory,
> sample/pfguide/libpf/C, take a look at complex.c. The shared structure
> is called "SharedData"; the pointer to the structure is called "Shared".
>
> If your problem is something else, let me know...
>
> Good Luck!
>
> -Tom
>
>
>-- End of excerpt from Tom McReynolds

-- 
Marco Tartaglia                                                     Infobyte Spa
VR R&D Software Engineer                                Via della Camilluccia 67
E-mail marco++at++infobyte.it                                              00135 Roma
Tel +39-6-35572210                                            Fax +39-6-35572300




/*
 * file: dummy.c
 * ----------------
 * 
 * $Revision: 1.00 $
 * $Date: 1996/01/17 12:00:00 $
 * 
 * IBX dummy program source.
 * 
 * Test for ProjectTexture.
 * 
 */






#include <Performer/pf.h>
#include <Performer/pfdu.h>


static void TravDraw(pfChannel* handle, void* data);


typedef struct
{
    pfChannel*	    chan;
    pfScene*	    scene;
    pfNode*	    node;
    pfLightSource*  sun;


    pfLightSource   *spot;
    pfFrustum       *spotFrust;
    pfTexture       *spotTex;
    pfFog           *spotFog;
    pfEarthSky      *esky;
    pfDCS           *spotDCS;
    pfCoord	    coord;


    pfLightModel    *lm;
    
} dummySharedData;




static dummySharedData* dummmy;




void main(int argc, char* argv[])
{
    pfVec3	    xyz, hpr;


    pfInit();
    
    pfNotifyLevel(5);
    
    pfMultiprocess(PFMP_APPCULL_DRAW);


    dummmy = (dummySharedData*)pfCalloc(1, sizeof(dummySharedData), pfGetSharedArena());


    pfConfig();


    dummmy->chan = pfNewChan(pfGetPipe(0));
    pfChanTravFunc(dummmy->chan, PFTRAV_DRAW, TravDraw);
    dummmy->scene = pfNewScene();
    pfChanScene(dummmy->chan, dummmy->scene);    
    dummmy->node = pfdLoadFile("/usr/share/Performer/data/esprit.flt");
    pfAddChild(dummmy->scene, dummmy->node);
    pfSetVec3(xyz, 0.0f, -15.0f, 0.0f);
    pfSetVec3(hpr, 0.0f, 0.0f, 0.0f);
    pfChanView(dummmy->chan, xyz, hpr);


/* This light is used to avoid the 'faceting' of planar poligons */
    dummmy->sun = pfNewLSource();
    pfLSourcePos(dummmy->sun, 0.0f, 1.0f, 0.0f, 0.0f);
    pfSpotLSourceDir(dummmy->sun, 0.0f, 1.0f, 0.0f);
    pfLSourceColor(dummmy->sun, PFLT_DIFFUSE, 1.0f, 1.0f, 1.0f);
    pfSpotLSourceCone(dummmy->sun, 0.0f, 20.0f);
    pfAddChild(dummmy->scene, dummmy->sun);


    dummmy->spotTex = pfNewTex(pfGetSharedArena());
    pfTexRepeat(dummmy->spotTex, PFTEX_WRAP, PFTEX_CLAMP);
    printf("\n\nSpot Texture Loaded: %d\n\n", pfLoadTexFile(dummmy->spotTex, "scacchi.inta"));


    dummmy->spotFrust = pfNewFrust(pfGetSharedArena());
    pfMakeSimpleFrust(dummmy->spotFrust, 60.0f);
    pfFrustNearFar(dummmy->spotFrust, 1.0f, 1000.0f);


    dummmy->spot = pfNewLSource();
    pfLSourcePos(dummmy->spot, 0.0f, 0.0f, 0.0f, 1.0f);
    pfSpotLSourceDir(dummmy->spot, 0.0f, 1.0f, 0.0f);
    pfLSourceColor(dummmy->spot, PFLT_DIFFUSE, 1.0f, 1.0f, 1.0f);
    pfSpotLSourceCone(dummmy->spot, 0.0f, 20.0f);
    pfLSourceAttr(dummmy->spot, PFLS_PROJ_TEX, dummmy->spotTex);
    pfLSourceAttr(dummmy->spot, PFLS_PROJ_FRUST, dummmy->spotFrust);
    pfLSourceMode(dummmy->spot, PFLS_PROJTEX_ENABLE, PF_ON);


    dummmy->spotDCS = pfNewDCS();
    pfAddChild(dummmy->spotDCS, dummmy->spot);
    pfAddChild(dummmy->scene, dummmy->spotDCS);
    pfSetVec3(dummmy->coord.xyz, 0.0f, -2.0f, 0.0f);
    pfSetVec3(dummmy->coord.hpr, 0.0f, 0.0f, 0.0f);
    pfDCSCoord(dummmy->spotDCS, &(dummmy->coord));


    while (TRUE)
    {
	pfFrame();
    }


}






static void TravDraw(pfChannel* handle, void* data)
{
    static int first = 1;
    
    if (first)
    {
	dummmy->lm = pfNewLModel(pfGetSharedArena());
	pfLModelAmbient(dummmy->lm, 0.5f, 0.5f, 0.5f);
	
/* if i call pfLModelLocal the 'faceting' of poligons is back */
/*	pfLModelLocal(dummmy->lm, PF_ON);*/


	pfApplyLModel(dummmy->lm);


	first = 0;
    }
    
    pfClearChan(handle);
    pfDraw();
}

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