Hello! After checking a couple of tutorials and descriptions I still haven't found an answer for a question I've got. Consider the following piece of code ... There is a part of scene where I need to use multitexturing to blend the floor with a lightmap :

        glActiveTextureARB(GL_TEXTURE0_ARB);
        DevEngine.TextureMgr.BindTexture(TextureTile);
        glEnable(GL_TEXTURE_2D);
        
        glActiveTextureARB(GL_TEXTURE1_ARB);
        DevEngine.TextureMgr.BindTexture(TextureLightMap);        
        glEnable(GL_TEXTURE_2D);
        
        glBegin(GL_QUADS);
            glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0, 0.0);
            glMultiTexCoord2fARB(GL_TEXTURE1_ARB, -0.35, -0.35);
            glVertex3f(-FloorSize, 0.0, -FloorSize);

            glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 8.0, 0.0);
            glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.35, -0.35);
            glVertex3f(FloorSize, 0.0, -FloorSize);

            glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 8.0, 8.0);
            glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.35, 0.35);
            glVertex3f(FloorSize, 0.0, FloorSize);

            glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0, 8.0);
            glMultiTexCoord2fARB(GL_TEXTURE1_ARB, -0.35, 0.35);
            glVertex3f(-FloorSize, 0.0, FloorSize);            
        glEnd();        
        
        glDisable(GL_TEXTURE_2D);   // GL_TEXTURE1_ARB
        
        glActiveTextureARB(GL_TEXTURE0_ARB);

... after it's done, I don't need multitexturing for a rest of scene drawing. The question is - can I use glTexCoord2f() to draw primitives in a 'standard' way or should I use glMulitTexCoord2f(GL_TEXTURE0_ARB, ...) from then on ? To put it another way - after I used glActiveTextureARB once, is it possible to do the following thing :

// (...)
        DevEngine.TextureMgr.BindTexture(TextureLight);
        glBegin(GL_QUADS);
            glTexCoord2f(1.0, 0.0); glVertex3f((up[0] - right[0]) *  size, (up[1] - right[1]) *  size, (up[2] - right[2]) *  size);        
            glTexCoord2f(1.0, 1.0); glVertex3f((up[0] + right[0]) *  size, (up[1] + right[1]) *  size, (up[2] + right[2]) *  size);
            glTexCoord2f(0.0, 1.0); glVertex3f((right[0] - up[0]) *  size, (right[1] - up[1]) *  size, (right[2] - up[2]) *  size);
            glTexCoord2f(0.0, 0.0); glVertex3f((up[0] + right[0]) * -size, (up[1] + right[1]) * -size, (up[2] + right[2]) * -size);
        glEnd();

Thanks in advance! :)

You can use glTexCoord2f() even in your multitexturing code instead of glMultiTexCoord2f(GL_TEXTURE0,...) , all it does is always set the texture coordinates of unit 0. So, when the first parameter of MultiTexCoord is GL_TEXTURE0, glTexCoord() and glMultiTexCoord() are equivalent.

OK, thanks! That's exactly what I wanted to know. :)

Thus, I'll have another question if you don't mind. The problem is that I must have made some mistake when writing a demo because it runs terribly-surprisingly-illogicaly slow on some machines (1-4 fps) while on others it works > 1300 fps. The only part suspected of making the mess is the way I use multitexturing. So ...

    if (bLightmapEnabled)    {         glActiveTextureARB(GL_TEXTURE1_ARB);         glMatrixMode(GL_TEXTURE);            glLoadIdentity();            glTranslatef(0.5, 0.5, 0.0);            glRotatef(-LightRotation, 0.0, 0.0, 1.0);         glMatrixMode(GL_MODELVIEW);                  glActiveTextureARB(GL_TEXTURE0_ARB);         glDisable(GL_TEXTURE_2D);    } 

Do you see anything wrong in the code above?

Thanks once again! :)

OK, I see. It's possible that the problem lies somewhere else. It might be SDL input as well. Anyway, you can check out the application yourself if you like. :) I'd really appreciate any feedback!

Here you can get it : http://priv.ckp.pl/aero/DemoMD2.exe.

Should you notice some problems, you can try a patch (no lightmap version) : http://priv.ckp.pl/aero/PatchDemoMD2.rar

Thanks :)