Thanks for stopping in Kai.
glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
glEnable(GL_LINE_SMOOTH);
These are legacy line smoothing features.
Line smoothing in Opengl using multisampling is enabled and disabled with the
following calls:
glEnable(GL_MULTISAMPLE);
glDisable(GL_MULTISAMPLE);
However this only turning MSAA on and off. In order to see the level of AA
1x,2,x,4x, etc you must request N samples via attributes while creating your
opengl context
Example attributes to request 4x MSAA: (you pass this array to glxCreateContext)
int visual_attribs[] = {
GLX_X_RENDERABLE,True,
GLX_DRAWABLE_TYPE,GLX_WINDOW_BIT,
GLX_RENDER_TYPE,GLX_RGBA_BIT,
GLX_X_VISUAL_TYPE,GLX_TRUE_COLOR,
GLX_RED_SIZE,8,
GLX_GREEN_SIZE,8,
GLX_BLUE_SIZE,8,
GLX_ALPHA_SIZE,8,
GLX_DEPTH_SIZE,24,
GLX_STENCIL_SIZE,8,
GLX_DOUBLEBUFFER,True,
//GLX_SAMPLE_BUFFERS , 1,
//GLX_SAMPLES , 4,
None
};
What is not clear to me is how to control this step. I am not sure that I can
with fltk 1.3 and if not I need to look into a) what level of AA does fltk 1.3
request b) how I might be able to extend or patch the API to allow me to do
this. It's a trivial few lines of code but my assumption is that fltk 1.3
developers want clients to use calls to "mode" exclusively to affect changes to
how the GL context is created.
This is conjecture at this point as I have not looked over the source yet or
talked to anyone about how this might work if my initial hunches prove to be
true. I could be very wrong as I am still very new to fltk.
> Am 02.09.09, 18:12 -0700 schrieb Shon Pritchett:
> > Can I control the level of AA applied somehow? I believe that's my last
> > question and I'll stop bothering you all for a few moons.
>
> I am not shure which of the following calls does switch the line smoothing
> in my open source app, but here they are:
> glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
> glEnable(GL_LINE_SMOOTH);
> The above works after the GL context initialisation.
>
> Probably OpenGL knows other switches as well.
>
> kind regards
> Kai-Uwe Behrmann
> --
> developing for colour management
> www.behrmann.name + www.oyranos.org
>
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