Rendering fonts on OpenGL

Hello,

This is a Tahoma font, rendered with OpenGL

look how much difference between no-AA
and with enabled multisampling.

I think that with multisampling, the quality is quite good to not
bother about sub-pixel AA.
Sub-pixel AA could be added later, if there's any brave soul who can
implement a fragment shader for it :)

Moreover, with multisampling, all fragments on screen (lines, points,
polygons) will also be automatically antialiased.
This means no rigid edges for everything, not just for fonts :)

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Best regards,
Igor Stasenko AKA sig.

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Hi, may I ask how you are rendering these fonts? You parse the glyphs and then render lines with opengl or use freetype to render to a texture without antialiasing or both? If you asked me, I'd say I like the method but for fonts they look a bit blury, I'd say too much for the smaller ones. Also, what are you working on?

Regards,
            Javier.




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Javier Pimás
Ciudad de Buenos Aires

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2010/5/23 Javier Pimás <[hidden email]>:
> Hi, may I ask how you are rendering these fonts? You parse the glyphs and
> then render lines with opengl or use freetype to render to a texture without
> antialiasing or both?

Squeak has already a TT font reader, so i just taking the data from there
and piping to GPU.
What you see here is freely scalable vector/curve rendering done
completely on GPU.

> If you asked me, I'd say I like the method but for
> fonts they look a bit blury, I'd say too much for the smaller ones.

I think this is best what you can achieve without hinting / subpixel AA.

> Also, what are you working on?
>
I once did a GLCanvas,
and now i want to reiterate and improve it using new callout mechanism
(NativeBoost),
and full coverage of OpenGL API, with all extensions available at your disposal.

> Regards,
>             Javier.
>
> 2010/5/23 Igor Stasenko <[hidden email]>


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Best regards,
Igor Stasenko AKA sig.

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On May 23, 2010, at 11:04 PM, Igor Stasenko wrote:

Igor it would be good it we could have

NativeBoostRomeCanvas

if you see what I mean :)


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