https://bugs.freedesktop.org/show_bug.cgi?id=78703

--- Comment #10 from ablumer <[email protected]> ---
I know next to nothing about GL, but I ran the same test above using qapitrace,
a graphical front-end to GL API tracing. qapitrace shows each of the API calls
in sequence, and in frame number 2 (which is the third frame), it is showing
the frame turning white after this API call:

glDrawArrays(GL_TRIANGLES, 0, 6)


It's probably also important to note that because of different screen and slide
aspect ratios, the display puts vertical black bars on either side of the slide
to fill the screen, and the white screen has those black bars on either side.
So it looks as though something really did intend to show an all-white slide.

Here is a list of some of the API calls before that glDrawArrays() (from
'apitrace dump'):

348 glPushMatrix()
349 glDisable(cap = GL_DEPTH_TEST)
350 glBindTexture(target = GL_TEXTURE_2D, texture = 1)
351 glPushMatrix()
352 glScaled(x = 0.8989751098096632, y = 1, z = 1)
353 glEnableClientState(array = GL_VERTEX_ARRAY)
354 glEnableClientState(array = GL_NORMAL_ARRAY)
355 glEnableClientState(array = GL_TEXTURE_COORD_ARRAY)
356 glTexCoordPointer(size = 2, type = GL_DOUBLE, stride = 0, pointer =
blob(96))
357 glNormalPointer(type = GL_DOUBLE, stride = 0, pointer = blob(144))
358 glVertexPointer(size = 3, type = GL_DOUBLE, stride = 0, pointer =
blob(144))
359 glDrawArrays(mode = GL_TRIANGLES, first = 0, count = 6)

I'll keep the trace around. Its over 2MiB so I'm not sure if it can be
uploaded.

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