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https://bugs.freedesktop.org/show_bug.cgi?id=4965
Summary: Windows GDI driver doublebuffer + alpha triggers
assertation
Product: Mesa
Version: 6.4
Platform: PC
OS/Version: Windows NT
Status: NEW
Severity: normal
Priority: P2
Component: Other
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
Hi!
The windows GDI driver has a bug which triggers an assertation in src/mesa/main/
renderbuffer.c, line 1628 (assert(fb->Attachment[b].Renderbuffer);) when it is
told to setup a double buffered context with alpha planes. This happens because
it creates the BUFFER_FRONT_LEFT only in for single-buffer, and only
BUFFER_BACK_LEFT for double-buffer.
I attached a proposed fix (which also fixes 2 unrelated warnings), but am not
sure the fixes are correct because the same renderbuffer is used for front and
back. However the GDI driver seems to use a single memory bitmap if double
buffering is enabled, which it bitblts into the window when the buffers are
swapped so the changes should be ok I think.
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