[Bug 32687] New: XBMC software video renderer is faster than OpenGL video renderer

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Dec 27 12:22:21 PST 2010


           Summary: XBMC software video renderer is faster than OpenGL
                    video renderer
           Product: Mesa
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: nguyenthetoan at gmail.com

I have an integrated AMD760G graphic card. I use the latest r600g driver from
xorg-edgers package repository for ubuntu Lucid. 

My most important OpenGL software is XBMC. It has three video renderers:
Software, ARB or GLSL. I notice (using the debug information of XBMC) that the
Software renderer is actually the fastest one, then ARB and finally GLSL. I
guess something is not well optimized in r600g with regard to video rendering.
This is especially true for 1080p video (sometime I get only 12-16fps using
OpenGL renderers while CPU usage is still only 50%. Software renderer could do
24fps with 100% CPU.).

FYI, I also have another similar desktop, but with ATI X1650 PRO card. On this
machine, using the r300g driver, the GLSL renderer is fastest (also similar to
ARB renderer) and is faster than the Software renderer. So, r300g is well
optimized with regard to video rendering.

I file this bug hoping the developers could spare sometime optimize r600g for
video rendering.

Thanks a lot

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