[Bug 92323] Font rendering issue on Intel GMA X3100/X4500 with Android-x86

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92323

--- Comment #11 from Mauro Rossi <issor.oruam at gmail.com> ---
Hi,

>Can you run in GDB or similar debugger?  If so, please set a breakpoint at >_mesa_error and provide a backtrace.  From within _mesa_error, could you also >print the value of ctx->API?

I'm not skilled enough with GDB, sorry, but I could use DBG(...) to print
checkpoint informations in logcat.
Apitrace collection is possible on kitkat-x86 while it is still very difficult
to perform on lollipop-x86.

We are trying to collect apitrace on kitkat-x86, while dreaming of it on
lollipop-x86, but I would proceed on OpenGL ES version checks.

>From some out-of-band communication there was a suggestion that the problem >could be because of uses of GL_PIXEL_UNPACK_BUFFER and GL_PIXEL_PACK_BUFFER in >meta.  Meta usually sets the API to API_OPENGL_COMPAT to avoid problems like >this, but it's possible that was missed.  I believe PBOs were added in OpenGL ES >3.0, but i965GM is an OpenGL ES 2.0 part.

pstglia, a fellow  member of Android-x86 forum came to the same conclusion that
PBO are OpenGL ES 3.0 and the binding with
GL_PIXEL_PACK_BUFFER/GL_PIXEL_PACK_BUFFER targets fails returning NULL and
causing the 0x500 error.

I think that API_OPENGL_COMPAT is definitely worth a try.
Do you have a proposed patch for us to test and report?

Thanks a lot

Mauro

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