On the lab systems however, we generally see no textures, or just the last texture loaded in glBindTexture (actually using QT's bind texture, but I tried replacing it with the related OpenGL ...

I'm porting an old SGI Motif/OpenGL app to Linux Qt/OpenGL and I'm having trouble getting custom colormaps to work. My test code makes a colormap that shades from black to white (as indices 0 ...