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glamor/egl: Avoid crashing on broken configurations

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0a9415cf apparently can tickle bugs in the GL stack where glGetString
returns NULL, presumably because the eglMakeCurrent() didn't manage to
actually install a dispatch table and you're hitting a stub function.
That's clearly not our bug, but if it happens we should at least not
crash. Notice this case and fail gently.

Signed-off-by: Adam Jackson <ajax@redhat.com>
This commit is contained in:
Adam Jackson 2018-10-05 14:50:20 -04:00
commit af151895f3
2 changed files with 12 additions and 1 deletions
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5
glamor/glamor_egl.c
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@ -995,6 +995,11 @@ glamor_egl_init(ScrnInfoPtr scrn, int fd)
}
renderer = glGetString(GL_RENDERER);
if (!renderer) {
xf86DrvMsg(scrn->scrnIndex, X_ERROR,
"glGetString() returned NULL, your GL is broken\n");
goto error;
}
if (strstr((const char *)renderer, "llvmpipe")) {
xf86DrvMsg(scrn->scrnIndex, X_INFO,
"Refusing to try glamor on llvmpipe\n");