RE: What's wrong

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Tawfek Mukhtar (tawfek++at++media1.rndtm.com.my)
Sun, 10 Mar 1996 11:49:09 -0800

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This may be trivial, anyway I still don't know the answer. I've modified the
program
/usr/src/Performer/src/pguide/libpr/examples/colorcube.c
into 2 slightly different program called cubenoerror.c and cubewitherror.c
(both are attached with this mail). The different is the sequence of
declaration of geometric data for the cube. Both compiled without problem yet
only cubenoerror.c display the color cube. Why ? I suspect that the sequence
mustbe the cause but I don't see why.
I really appreciate if anyone can provide me with logically correct
explaination.

thanks

/*How to make a cube*/

#include <Performer/pf.h>

#define CUBE_SIZE 1.0f

int main(void)
{
    pfChannel * chan;
    pfPipe * pipe;
    pfScene * scene;
    pfGeode * geode;
    pfCoord view;
    float time;
    float maxTime = 5.0f;
    pfGeoSet *gset;
    pfGeoState *gst;
    void *arena;

    /* These data arrays are static so that they will exist after
     * this routine exits.
     */
    static pfVec4 scolors[] ={{1.0f, 0.0f, 0.0f, 0.5f},
                                       {0.0f, 1.0f, 0.0f, 0.5f},
                                       {0.0f, 0.0f, 1.0f, 0.5f},
                                       {1.0f, 1.0f, 1.0f, 0.5f}};

    static pfVec3 snorms[] ={{ 0.0f, 0.0f, 1.0f},
                                      { 0.0f, 0.0f,-1.0f},
                                      { 0.0f, 1.0f, 0.0f},
                                      { 0.0f,-1.0f, 0.0f},
                                      { 1.0f, 0.0f, 0.0f},
                                      {-1.0f, 0.0f, 0.0f}};

    static pfVec3 scoords[] ={{-CUBE_SIZE,-CUBE_SIZE, CUBE_SIZE},
                                       { CUBE_SIZE,-CUBE_SIZE, CUBE_SIZE},
                                       { CUBE_SIZE, CUBE_SIZE, CUBE_SIZE},
                                       {-CUBE_SIZE, CUBE_SIZE, CUBE_SIZE},
                                       {-CUBE_SIZE,-CUBE_SIZE, -CUBE_SIZE},
                                       { CUBE_SIZE,-CUBE_SIZE, -CUBE_SIZE},
                                       { CUBE_SIZE, CUBE_SIZE, -CUBE_SIZE},
                                       {-CUBE_SIZE, CUBE_SIZE, -CUBE_SIZE}};

    static ushort snindex[] ={0, 5, 1, 4, 2, 3};

    static ushort svindex[] ={0, 1, 2, 3, /* front */
                                      0, 3, 7, 4, /* left */
                                      4, 7, 6, 5, /* back */
                                      1, 5, 6, 2, /* right */
                                      3, 2, 6, 7, /* top */
                                      0, 4, 5, 1}; /* bottom */

    static ushort scindex[] ={0, 1, 2, 3,
                                      0, 1, 2, 3,
                                      0, 1, 2, 3,
                                      0, 1, 2, 3,
                                      0, 1, 2, 3,
                                      0, 1, 2, 3};




    pfInit();
    pfConfig();

    pipe = pfGetPipe(0);
    chan = pfNewChan(pipe);

    pfInitPipe(pipe, NULL);
    geode = pfNewGeode();
    scene = pfNewScene();


    arena = pfGetSharedArena();
    gset = pfNewGSet(arena);

pfGSetGState(gset, gst);

    pfAddGSet(geode,gset);
    pfAddChild(scene, geode);
    pfChanScene(chan, scene);

    pfSetVec3(view.xyz, 10.0f, -10.0f, 10.0f);
    pfSetVec3(view.hpr, 45.0f, -30.0f, 0.0f);

    pfChanView(chan, view.xyz, view.hpr);

    pfInitClock(0.0f);

    while (time < maxTime){
        pfSync();
        time = pfGetTime();
        pfFrame();
    }

    pfExit();
    exit(0);
}

#include <Performer/pf.h>

#define CUBE_SIZE 1.0f

     /* These data arrays are static so that they will exist after
     * this routine exits.
     */
    static pfVec3 scoords[] ={{-CUBE_SIZE,-CUBE_SIZE, CUBE_SIZE},
                                       { CUBE_SIZE,-CUBE_SIZE, CUBE_SIZE},
                                       { CUBE_SIZE, CUBE_SIZE, CUBE_SIZE},
                                       {-CUBE_SIZE, CUBE_SIZE, CUBE_SIZE},
                                       {-CUBE_SIZE,-CUBE_SIZE, -CUBE_SIZE},
                                       { CUBE_SIZE,-CUBE_SIZE, -CUBE_SIZE},
                                       { CUBE_SIZE, CUBE_SIZE, -CUBE_SIZE},
                                       {-CUBE_SIZE, CUBE_SIZE, -CUBE_SIZE}};

    static pfVec3 snorms[] ={{ 0.0f, 0.0f, 1.0f},
                                      { 0.0f, 0.0f,-1.0f},
                                      { 0.0f, 1.0f, 0.0f},
                                      { 0.0f,-1.0f, 0.0f},
                                      { 1.0f, 0.0f, 0.0f},
                                      {-1.0f, 0.0f, 0.0f}};

    static ushort snindex[] = { 0, 5, 1, 4, 2, 3};

    static pfVec4 scolors[] ={{1.0f, 0.0f, 0.0f, 0.5f},
                                       {0.0f, 1.0f, 0.0f, 0.5f},
                                       {0.0f, 0.0f, 1.0f, 0.5f},
                                       {1.0f, 1.0f, 1.0f, 0.5f}};

    static ushort scindex[] ={0, 1, 2, 3,
                                      0, 1, 2, 3,
                                      0, 1, 2, 3,
                                      0, 1, 2, 3,
                                      0, 1, 2, 3,
                                      0, 1, 2, 3};

    pfInit();
    pfConfig();

    pipe = pfGetPipe(0);
    chan = pfNewChan(pipe);

    pfInitPipe(pipe, NULL);
    geode = pfNewGeode();
    scene = pfNewScene();

arena = pfGetSharedArena();
gset = pfNewGSet(arena);

    /*
     * set the coordinate, normal and color arrays
     * and their cooresponding index arrays
     */
    pfGSetAttr(gset, PFGS_COORD3, PFGS_PER_VERTEX, scoords, svindex);
    pfGSetAttr(gset, PFGS_NORMAL3, PFGS_PER_PRIM, snorms, snindex);
    pfGSetAttr(gset, PFGS_COLOR4, PFGS_PER_VERTEX, scolors, scindex);
    pfGSetPrimType(gset, PFGS_QUADS);
    pfGSetNumPrims(gset, 6);

    /*
     * create a new geostate from shared memory,
     * disable texturing and enable transparency
     */
    gst = pfNewGState(arena);
    pfGStateMode(gst, PFSTATE_ENTEXTURE, 0);
    pfGStateMode(gst, PFSTATE_TRANSPARENCY, 1);

    pfGSetGState(gset, gst);


    pfAddGSet(geode, gset);
    pfAddChild(scene, geode);
    pfChanScene(chan, scene);

    pfSetVec3(view.xyz, 10.0, -10.0, 10.0);
    pfSetVec3(view.hpr, 45.0, -10.0, 0.0);

    pfInitClock(0.0f);

    while(time < maxTime){
        pfSync();
        pfChanView(chan, view.xyz, view.hpr);
        time = pfGetTime();
        pfFrame();
    }

    pfExit();
    exit(0);
}

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