| Summary: | VBO is still mapped after drawing, therefore glMapBuffer fails | ||
|---|---|---|---|
| Product: | Mesa | Reporter: | David Henry <tfc.duke> |
| Component: | Drivers/DRI/i915 | Assignee: | Default DRI bug account <dri-devel> |
| Status: | RESOLVED FIXED | QA Contact: | |
| Severity: | normal | ||
| Priority: | medium | ||
| Version: | git | ||
| Hardware: | Other | ||
| OS: | All | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: |
Test case : if it segfault, then it failed!
Xorg.0.log |
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OpenGL renderer string: Mesa DRI Intel(R) 945GM GEM 20090114 x86/MMX/SSE2 OpenGL version string: 1.4 Mesa 7.5-rc4 Created attachment 27232 [details]
Xorg.0.log
(In reply to comment #0) > * it fails for me with mesa 7.5 up to date from git, but it has been reported > to me that it fails with mesa 7.6 (up do date from git) too. > I was the one he mentioned that was having it fail in 7.6, and the problem was fixed by some commit in master between: 57a06d3a48c9af1067ec05e3ad96c58f4b9b99be (works as intended) and 1f070125e365dadf97797785fdeef1ccb1431f21 (failed) Yeah, should be covered by: commit 57a06d3a48c9af1067ec05e3ad96c58f4b9b99be Author: Eric Anholt <eric@anholt.net> Date: Mon Jun 29 18:48:27 2009 -0700 i915: Fix assertion failure on remapping a non-BO-backed VBO. Failure to set the obj->Pointer back to null tripped up the assertion. Bug #22428. Yes, it works now. Thank you. Mass version move, cvs -> git |
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Created attachment 27231 [details] Test case : if it segfault, then it failed! After having mapped a VBO once with glMapBuffer for data initialization and drawn it, the buffer seems not to be unmapped as expected. This cause the next call to glMapBuffer to always return NULL. The attached program show a test case. It should draw a rotating cube. After the first frame is drawn, it segfaults. Expected output: [...] Before copying data, buffer is not mapped Mapping frame 18 Before drawing, buffer is not mapped After drawing, buffer is not mapped Frame 18 finished... ---------- Before copying data, buffer is not mapped Mapping frame 19 Before drawing, buffer is not mapped After drawing, buffer is not mapped Frame 19 finished... ---------- Before copying data, buffer is not mapped Mapping frame 20 Before drawing, buffer is not mapped After drawing, buffer is not mapped Frame 20 finished... [...] Current output: Before copying data, buffer is not mapped Mapping frame 1 Before drawing, buffer is not mapped After drawing, buffer is mapped Frame 1 finished... ---------- Before copying data, buffer is mapped Mapping frame 2 Segmentation Fault NOTES: * it works in software mode (LIBGL_ALWAYS_SOFTWARE=1), * it works with Mesa 7.3 in Ubuntu Jaunty (9.04), * it works with NVIDIA 177.82 and 180.44 proprietary drivers, * it fails for me with mesa 7.5 up to date from git, but it has been reported to me that it fails with mesa 7.6 (up do date from git) too.