[Bug 106123] draw does not work in a simple example

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106123

            Bug ID: 106123
           Summary: draw does not work in a simple example
           Product: Mesa
           Version: git
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: xinghua.cao at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 138904
  --> https://bugs.freedesktop.org/attachment.cgi?id=138904&action=edit
source code of example

I found a issue in ANGLE project that draw does not work, and had written a
simple example to reproduce this issue, attachment is the source code.
Steps:
1. gcc -o srgb srgb.c -lX11 -lepoxy
2. ./srgb

I had used readPixels to get fbo content and wrote content to files in current
directory, the name is "result_1/2/3/4.rgba", These files were all empty, it
seems that mesa did draw nothing.
The same case had run on NVIDIA GPU, which draw something normally.
I had spent some time to debug it, but did not find the root cause. Please help
me to check it, thank you.

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