[RQt-devel] unable to draw glyphs using OpenGL

[Michael Lawrence]

This is probably a hardware issue. Perhaps your card does not support point
sprites. I'm guessing that cranvas used circles in the past. Perhaps an
option could be added somewhere in the stack.

On Mon, Oct 22, 2012 at 8:08 AM, Tomas Sieger <tomas.sieger at seznam.cz>wrote:

> Hi,
>  I'm unable to draw glyphs when using OpenGL to render my scene:
>
> scene <- qscene()
> layer <- qlayer(scene, function(layer, painter) {
>     qdrawGlyph(painter, qglyphCircle(r=5),5,5) # doesn't work using OpenGL
>     qdrawCircle(painter, 2, 2, r=3) # always works
>     }, limits = qrect(0, 0, 10, 10))
> view <- qplotView(scene)
> print(view)
>
> however, when I turn OpenGL off, it works:
>
> scene <- qscene()
> layer <- qlayer(scene, function(layer, painter) {
>     qdrawGlyph(painter, qglyphCircle(r=5),5,5) # works if using SW driver
>     qdrawCircle(painter, 2, 2, r=3) # always works
>     }, limits = qrect(0, 0, 10, 10))
> view <- qplotView(scene,opengl=FALSE)
> print(view)
>
> Is it a known issue?
> I'm running Qt 4.5.3.
> My video is Intel Corporation Cantiga Integrated Graphics Controller.
>
> > sessionInfo()
> R version 2.15.0 (2012-03-30)
> Platform: i686-pc-linux-gnu (32-bit)
>
> locale:
> [1] C
>
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
>
> other attached packages:
> [1] qtpaint_0.9.0  qtbase_1.0.6   colorout_0.9-9
>
> ---
>
> BTW cranvas 'qscatter' (which is based on glyphs currently - and
> therefore is not working for me) worked for me some time ago (but I
> don't know whether it was using glyphs at that time), but I can't tell
> what of qtpaint/qtbase/cranvas/etc. I've upgraded, sorry :-(.
>
> Regards,
>  Tomas
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>
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>
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