[Mesa-dev] [Bug 92706] glBlitFramebuffer refuses to blit RGBA to RGB with MSAA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92706

            Bug ID: 92706
           Summary: glBlitFramebuffer refuses to blit RGBA to RGB with
                    MSAA
           Product: Mesa
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: timon37 at gmail.com
        QA Contact: mesa-dev at lists.freedesktop.org

Created attachment 119247
  --> https://bugs.freedesktop.org/attachment.cgi?id=119247&action=edit
patch to allow RGBA->RGB multi-sampled resolves

When doing a glBlitFramebuffer from an RGBA multisampled texture to a regular
RGB texture mesa gives GL_INVALID_OPERATION "(bad src/dst multisample pixel
formats)".

With the attached patch the operation works fine on a Radeon HD6850 and Intel
Core i7-4770R, which hints that the drivers already support it.

This issue breaks MSAA in "X Rebirth", both nvidia and amd proprietary drivers
support this kind of resolve. We have a clean error log (using debug_output) so
afaik we're doing everything correctly.

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