ken sartor (sartor++at++bur.visidyne.com)
Sat, 19 Apr 1997 11:38:11 -0500
I have been trying to get 3d texuring to work in the Performer
environment. However, i cannot get the PF_R coordinate to
do anything. Below is a code fragment that works when i use
PF_S and PF_T (it just puts a checkerboard texture on the geometry).
BUT when i try to set maxz (the coordinate that is used by PF_R)
to some number (say 4) no texturing takes place...
Am i doing something wrong? Or does Performer 2.0.2 not allow
me to use the PF_R coordinate? Is using 3d textures possible in
Performer?
BTW - i am running IRIX 6.2 on a 1 RM4 RE2 w/ Performer 2.0.2.
Thanks for any help you can provide!
ken
Code fragment for 3d texturing...
-------------------------------------------------------------------------
// texture experiment...
int maxx=4, maxy=4, maxz=1, kjs;
// Make a checkerboard texture.
for (int iz=0; iz<maxz; iz++) {
for (int iy=0; iy<maxy; iy++) {
for (int ix=0; ix<maxx; ix++) {
kjs = iz*maxx*maxy + iy*maxx + ix;
// printf(" kjs = %d ix = %d iy = %d iz = %d \n", kjs, ix, iy, iz);
// rbga colors are loaded here.
if ( iz%2 == 0)
{
if ( iy%2 == 0)
{
if ( kjs%2 == 0 )
tex_image[kjs] = 0x0000ffff;
else
tex_image[kjs] = 0x000000ff;
}
else
{
if ( kjs%2 == 0 )
tex_image[kjs] = 0x000000ff;
else
tex_image[kjs] = 0x0000ffff;
}
}
else
{
if ( iy%2 == 0)
{
if ( kjs%2 != 0 )
tex_image[kjs] = 0x0000ffff;
else
tex_image[kjs] = 0x000000ff;
}
else
{
if ( kjs%2 != 0 )
tex_image[kjs] = 0x000000ff;
else
tex_image[kjs] = 0x0000ffff;
}
}
}
}
}
// Set up the texturing stuff...
pfGStateMode(gstate2, PFSTATE_ENTEXTURE, PF_ON);
pfGStateAttr(gstate2, PFSTATE_TEXTURE, tex );
pfGStateAttr(gstate2, PFSTATE_TEXENV, tev);
pfGStateMode(gstate2, PFSTATE_ENTEXGEN, PF_ON);
pfGStateAttr(gstate2, PFSTATE_TEXGEN, tgen );
pfTEnvMode(tev, PFTE_DECAL);
pfTGenPlane(tgen, PF_S, 1.0e-2, 0.0, 0.0, 0.0);
pfTGenPlane(tgen, PF_T, 0.0, 0.0, 1.0e-2, 0.0);
pfTGenPlane(tgen, PF_R, 0.0, 1.0e-2, 0.0, 0.0);
pfTGenMode(tgen, PF_S, PFTG_OBJECT_LINEAR);
pfTGenMode(tgen, PF_T, PFTG_OBJECT_LINEAR);
pfTGenMode(tgen, PF_R, PFTG_OBJECT_LINEAR);
pfTexRepeat(tex, PFTEX_WRAP_S, PFTEX_REPEAT);
pfTexRepeat(tex, PFTEX_WRAP_T, PFTEX_REPEAT);
pfTexRepeat(tex, PFTEX_WRAP_R, PFTEX_REPEAT);
pfTexImage(tex, tex_image, 4, maxx, maxy, maxz);
// End texture experiment...
-------------------------------------------------------------------------
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