https://bugs.freedesktop.org/show_bug.cgi?id=75797
Priority: medium
Bug ID: 75797
Assignee: [email protected]
Summary: EGL application crashes with BadDrawable at
SwapBuffers
Severity: normal
Classification: Unclassified
OS: All
Reporter: [email protected]
Hardware: Other
Status: NEW
Version: unspecified
Component: EGL
Product: Mesa
Created attachment 95167
--> https://bugs.freedesktop.org/attachment.cgi?id=95167&action=edit
Test case
If you create two X windows, make one EGL context current to the first one and
then to the second one, then clear and swap the second one, you will get an X
error at swap buffers time.
After debugging, I found that the glClear is optimized away because the
gl_framebuffer has Width and Height == 0, despite the glViewport call that
invalidated the drawable. Thus intel_prepare_render() is never reached (the
viewport is already initialized in the second MakeCurrent call) and we never
query X for the DRI2 buffers for the second window.
X logs include
[107772.804] (EE) intel(0): [DRI2] DRI2SwapBuffers: drawable has no back or
front?
Test case attached. This is 100% reproducible here.
Mesa is befbda56a246f77797bdf13fc005353441db2879, from Feb 22, master branch.
Driver is i965 DRI, on a GM45 card.
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