[Mesa-dev] [Bug 36173] New: struct renderbuffer's 'format' field never set when using FBO

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=36173

           Summary: struct renderbuffer's 'format' field never set when
                    using FBO
           Product: Mesa
           Version: git
          Platform: Other
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
        AssignedTo: mesa-dev at lists.freedesktop.org
        ReportedBy: pelloux at gmail.com


Created an attachment (id=45537)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=45537)
simple app the exibhits the problem

When using glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, buffer) there's
a speed difference between reading back from framebuffer or from an FBO.

Using gdb I found that format field of renderbuffer structure is always equal
PIPE_FORMAT_NONE for the FBO which prevents using st_fast_readpixels.

I've built a simple patch which init format field in
"st_renderbuffer_alloc_storage" and there is an improvement (a.k.a
st_fast_readpixels is used everywhere).

What do you think of this (potential) issue ?

(I'm using git version of Mesa, and r600g)

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