[Mesa-dev] [Bug 89586] Drivers/DRI/swrast

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89586

--- Comment #27 from Dan Sebald <daniel.sebald at ieee.org> ---
Created attachment 114592
  --> https://bugs.freedesktop.org/attachment.cgi?id=114592&action=edit
swrast legacy Piglit test images

SWRAST_DRI.SO LEGACY

This is the current repository version of the legacy swrast driver.  The first
image (upper left corner) shows the original problem I and others had
experienced: vertical lines due to dropped pixels associated with
GL_MAX_TEXTURE_SIZE transition.  Interestingly, this doesn't happen when
xfactor is negative (one of the "pass" tests).  The Y-direction exhibits a good
gradient ramp, except for the very last pixel in the positive direction, which
is missing (look for the dark line near the top of the window), so this test
fails for reasons different than in the X direction.

The positive over/underrun with magnification X test actually looks good, and I
don't know why the test is failing.  These things can be looked at in greater
detail later.  The other three over/underrun tests in the X direction clearly
show that glDrawPixels isn't zooming to the right scale.  This is the other
potential bug I've wondered about.

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