The usage of glPointSize() in an OpenGL program does not (directly) change the size of points which are drawn by a following GL_POINTS directive/block.

I'm using a radeon9700 card. DRI is enabled.


Screenshot of how it is supposed to work (winXp + mingw + no_mesa):
http://ingo.wollsau.de/pointTest/screenshot_win.png

What OpenGL tells me about points here (see code):

point sizes (before drawing point): 
min: 1.000000, max: 64.000000, incr: 0.125000, actual: 1.000000
point sizes (after drawing point): 
min: 1.000000, max: 64.000000, incr: 0.125000, actual: 8.000000


Screenshot of how it actually works on my system:
http://ingo.wollsau.de/pointTest/screenshot_lin.png

What OpenGL tells me about points here (see code):

point sizes (before drawing point): 
min: 1.000000, max: 10922.000000, incr: 0.100000, actual: 1.000000
point sizes (after drawing point): 
min: 1.000000, max: 10922.000000, incr: 0.100000, actual: 8.000000


The used test-program code:
http://ingo.wollsau.de/pointTest/pointTest.c

This should display only one point at the specified size.

I modified this program that it draws a point with a size you enter via keyboard. This reveals that a point with the requested size is drawn only after the next size is specified. So it comes one display-cycle too late.
i.e: initial size 1, you enter 9, point stays at size 1, you enter size 5 and get point of size 9, end so on ...
http://ingo.wollsau.de/pointTest/pointTest2.c


glxinfo:
http://ingo.wollsau.de/clippingTest/glxinfo

xorg.log:
http://ingo.wollsau.de/clippingTest/xorg.log


May be related to:
http://bugs.freedesktop.org/show_bug.cgi?id=702


Previously posted here:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=408702