[Mesa-dev] [Bug 62042] New: X11 mouse cursor alpha blending on OpenGL application broken

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=62042

          Priority: medium
            Bug ID: 62042
          Assignee: mesa-dev at lists.freedesktop.org
           Summary: X11 mouse cursor alpha blending on OpenGL application
                    broken
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: steven at uplinklabs.net
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Other
           Product: Mesa

Created attachment 76203
  --> https://bugs.freedesktop.org/attachment.cgi?id=76203&action=edit
Intel HD 4000 showing the issue

I'm encountering a rendering issue with a alpha-blended X11 cursor (created
with libxcursor and set with XDefineCursor) on top of an OpenGL application.
The application in question is TOME4 (Tales of Maj'Eyal). It uses SDL 2.x to
interact with the X11 cursor API and set up an OpenGL rendering context.

I've reproduced this on both a ThinkPad X230 (Ivy Bridge, Intel HD 4000
graphics) and on a Westmere desktop system with a Radeon HD 6850. Both are
using open source drivers. I have *not* however been able to reproduce it on a
system with an NVIDIA card using the proprietary NVIDIA driver. I *think* the
common component between the two affected systems is mesa, but I'm not sure
what components of the graphics stack could be implicated in this issue.

I have also attempted using mesa from git (728240b64d) as well as the mesa 9.1
release.

I'm attaching photos of the screens on both systems. Screenshots are unable to
capture the issue, as the image is rendered correctly there (screenshot also
attached for comparison).

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