View Full Version : GL_ARB_point_parameters
02-04-2004, 11:59 AM
HI, I'm trying to use the GL_ARB_point_parameters extension but I can't find any examples on Google. Best link I've found is http://oss.sgi.com/projects/ogl-sample/registry/ARB/point_parameters.txt
but that's written in Greek (to me).
I thought I read that Quake used GL_EXT_point_parameters for particle effect explosions etc, and GL_ARB_point_parameters should be almost identical to that.
Can anyone explain or provide links?
02-04-2004, 12:40 PM
If you take a look at this page:
there is an example on using the EXT_point_parameters extension, which is pretty much the same as the ARB version except the functions and tokens are renamed.
There is a GLUT demo referenced on that page, you can find the source here:
02-04-2004, 01:21 PM
I was looking for ARB not EXT.
02-04-2004, 01:37 PM
They're exactly the same except for the names of the functions and tokens.
02-05-2004, 10:55 AM
I should have known that, but forgot while I was searching.
New question: I got the extension to work as far as making the size of a point shrink based on distance from the camera. But the extension documentation (see link above) seems to suggest you can make points fade colorwise rather than merely shrinking in size.
Anybody know how to do that? I can't make my points fade no matter what I try.
02-05-2004, 06:21 PM
I now think that point fading requires the WGL_ARB_multisample extension, which is generally unsupported right now. Grrr.
Does adjusting GL_POINT_FADE_THRESHOLD_SIZE accomplish what you want?
02-11-2004, 03:21 PM
the fade threshold only works if you also have the multisampling extension, which is basically an SGI-only extension that nobody in the PC world has access to
as far as I can tell anyway
I don't think that's true at all. It works just fine on the open-source G400 driver for Linux. Look at the pointblast demo that is included with Mesa.
02-12-2004, 12:14 AM
WGL_ARB_multisample is widely supported and if it isn't, there is a large chance the driver supports a core OpenGL version that includes it.
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