http://bugs.freedesktop.org/show_bug.cgi?id=23417
Summary: FBO / Windows software rendering: flickering due to
errornous blit
Product: Mesa
Version: unspecified
Platform: All
OS/Version: Windows (All)
Status: NEW
Severity: normal
Priority: medium
Component: Mesa core
AssignedTo: mesa3d-dev@lists.sourceforge.net
ReportedBy: florian.kir...@opencsg.org
Created an attachment (id=28793)
--> (http://bugs.freedesktop.org/attachment.cgi?id=28793)
Example program demonstrating the flickering
I have found a bug in the frame buffer object implementation, happening with
Mesa 7.4.4 using Mesa with software rendering and Windows XP.
The problem is that most of the FBO functions, such as glBindFramebufferEXT(),
in their implementation fbobject.c call ctx->Driver.Flush(ctx), which then
causes wmesa_flush() in wmesa.c to do a BitBlt into the visible viewer window
(when double buffering is on). This clears the window ahead of time, causing
severe flickering.
The simple, attached example program - a hacked gears.c with additional
glBindFramebufferEXT(...) in the draw() function - should demonstrate the
flickering.
For me, it helps to just comment out all lines with ctx->Driver.Flush(ctx) in
fbobject.c. FBOs then work fine in the Windows software rasterizer. For other
rendering paths, I guess this is not a good fix, of course.
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