[Bug 14198] New: [i965] glBitmap should not render when draw buffer is set to GL_NONE

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=14198

           Summary: [i965] glBitmap should not render when draw buffer is
                    set to GL_NONE
           Product: Mesa
           Version: unspecified
          Platform: Other
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
        AssignedTo: [EMAIL PROTECTED]
        ReportedBy: [EMAIL PROTECTED]
                CC: dri-devel@lists.sourceforge.net


Created an attachment (id=13852)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=13852)
test case

System Environment:
--------------------------

--Platform: Q965 & GM965
--Architecture(32-bit,64-bit,compatiblity): 32bit 

kernel: 
2.6.23

drm   
commit c6f175cbea1dba3fc26426243acc55b89b8a8064

mesa 
commit 02d5ba849197e19843dad164239b51f18fb16faf

xf86_video_intel 
commit 633dbd28218fd8a746c1735fd44a14f35bd07faa 


Bug detailed description:
--------------------------
this issue doesn't happen in software rendering mode.
this issue doesn't happen on i915

specify draw buffer as GL_NONE
then render with glBitmap, it should render nothing, but it still renders.

it seems either _mesa_drawbuffers() or intel_drawbuf_region() should be checked
to make this correct.


Reproduce steps:
----------------
1. start X
2. compile and run attached test case


Current result:
----------------
still renders


Expected result:
----------------
should not render


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