[Bug 105256] Slow performance using glDrawElementsBaseVertex

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105256

            Bug ID: 105256
           Summary: Slow performance using glDrawElementsBaseVertex
           Product: Mesa
           Version: 17.3
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: logan at bacoosta.com
        QA Contact: dri-devel at lists.freedesktop.org

Original application bug report here:

https://github.com/gonetz/GLideN64/issues/1561

This bug happens using mupen64plus (N64 emulator) and the GLideN64 graphics
plugin.

The application uses VBO streaming
(https://www.khronos.org/opengl/wiki/Buffer_Object_Streaming) using
ARB_buffer_storage to upload the VBO data.

Multiple users that when using Mesa + r600 driver, the performance was abysmal.
It turns out that converting the glDrawElementsBaseVertex calls to glDrawArrays
fixed the problem.

You can see the commit that fixed the problem here:

https://github.com/loganmc10/GLideN64/commit/9bcfa67d9550c7f1cd4ba72f657facd66a4d27e4

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