Tom Flynn wrote:
Hi there,
Background:
I'm currently running an application on a machine which has no graphics
and setting my display to another machine that has an NVidia card in it
(and has the nvidia closed-source drivers). The application makes
several calls to glDrawArrays(). One section of the code uses
glInterleavedArrays(), the rest of the app uses glVertexPointer() and
friends.
Xorg 6.8.2 on machine with no graphics.
Nvidia 1.0-6629, Xorg 6.8.0 on machine with graphics.
The symtoms:
With the section of code that uses glInterleavedArrays() disabled...
1) Run the app on my target machine and I just see a blank window on
my nvidia machine.
2) Replace glDrawArrays() with glDrawElements() (via an LD_PRELOADED
library i made), everything I expected shows up on screen.
Now, with the section of code that uses glInterleavedArrays() enabled
and glDrawArrays() replaced with glDrawElements()...
3) Bunch of white triangles that don't quite look right.
4) Replace glInterleavedArrays() with glVertexPointer(),
glEnableClientState(), etc., everything shows up correctly.
Given this, it seems as if glDrawArrays() and glInterleavedArrays() are
either not being sent correctly, or not being recieved correctly. Any
suggestions on how to narrow this down and tell which machine is
behaving badly?
Hi Tom,
Sounds like you're exercising GLX indirect rendering. You're using
the GLX/DRI-enabled libGL.so from Mesa or X.org, I presume?
Under normal circumstances, all the vertex array rendering commands
get unrolled into ordinary glBegin/glVertex/glNormal/glEnd calls.
That's because the vertex arrays themselves only exist on the client
side so sending the array drawing commands to the server wouldn't work.
You might have just found a simple bug in the client-side GLX code in
libGL. The code for glInterleavedArrays() is in
Mesa/src/glx/x11/vertarr.c if you want to look it over. I don't have
time to test anything right now.
BTW, vertex arrays can be stored server-side with the
GL_ARB_vertex_buffer_object extension. In that case, the
glDrawArrays/Elements calls would get sent over the wire. We don't
yet support this feature, though.
-Brian
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