For an important but infrequently used program based on FLTK, I have suddenly found that it is able to obtain only 5-bit color buffers (5+5+5 instead of 8+8+8), causing my application to mis-perform. (I read back the frame buffer, so the bitdepth is important to the proper function of the program.)
I don't believe I rebuilt the application recently, but I did upgrade my Macs from 10.6 (where I know the program worked) to 10.6.4 (in steps of course, but I didn't check the program at each step), and now it no longer works. During this progression of upgrades, I did not re-compile the program. If I now re-compile, the program still has the problem. Any suggestions? For a bit more information, I am currently using Mac 10.6.4, and fink's package for FLTK 1.1.7. The program is compiled for 32-bit. My graphics card is an NVIDIA 8800GT. To try getting to the bottom of the problem, I tried invoking fl_window->mode(FL_RGB8), although I don't have to, and I check fl_window->can_do()), which returns true. However, I then ask OpenGL for the depth of the returned window using glGetIntegerv(GL_RED_BITS,&redbits), it says 5 bits. It should say 8. Remember that this code has been working for years, and I believe the bug cropped up without me recompiling the program. Thus, I suspect it has arisen from one of the Mac upgrades, possibly in GLX, or X, or Quartz, or in the NVIDIA driver. Any suggestions? -Marc Levoy, Stanford University _______________________________________________ fltk-opengl mailing list fltk-opengl@easysw.com http://lists.easysw.com/mailman/listinfo/fltk-opengl
