[Mesa-dev] [Bug 101338] Mesa software rendering draws incompletely on Raspberry Pi

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101338

--- Comment #5 from Lloyd Wood <lloyd.wood at yahoo.co.uk> ---
Brian,

Thanks for checking this out. Which versions of Geomview and SaVi did you
install?

Seeing a solid blue sphere on your Intel system suggests either that
texturemapping is not used by default in SaVi (in SaVi versions earlier than
1.5.0 - play with the Rendering/map menu options, where you can select a
blue/yellow sphere or a more faithful realistic rendition) or that Geomview was
built without OpenGL support, and is only drawing using X. OpenGL is both a
build option and a command-line switch to turn it off in Geomview; configure
--with-opengl=DIR if building Geomview yourself.

To really show if OpenGL support is there and give it a workout, please open
Views/Global Coverage... in SaVi, select a map size from the popup dialog, then
turn on texturemapping from the end of the coverage window's Rendering window
and select the Views/>> Forwards... menu option to send the redrawn map bitmap
through to Geomview to wrap on the sphere during the animation. You'll see the
kind of thing shown in the top screenshots at
http://savi.sourceforge.net/papers/

The Raspberry Pi Model B problem affects all versions of SaVi I've tried on it,
and all recent versions of Geomview I've seen there are built with OpenGL,
which is why I didn't feel the need to be more detailed in my initial report,
sorry. I've never seen a similar rendering problem on the Intel systems I've
used this on, in over fifteen years (on Redhat, Cygwin, Ubuntu.)

A photo of SaVi/Geomview running on PIXEL 1.2 on the Pi Model B, showing the
rendering problem clearly, is at:
http://personal.ee.surrey.ac.uk/Personal/L.Wood/software/SaVi/images/raspberry-pi-model-b-software-mesa.jpeg

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