I think this is a case where using the forward compatibility bit may be a reasonable fix. This is because it will always disable the compatibility profile on core...
http://www.opengl.org/wiki/Core_And_Compatibility_in_Contexts On Jun 18, 2014 4:43 PM, "Chad Versace" <[email protected]> wrote: > On Wed, Jun 18, 2014 at 12:29:09AM +0100, Emil Velikov wrote: > > On 17/06/14 23:50, Ian Romanick wrote: > > > On 06/16/2014 11:29 PM, Ilia Mirkin wrote: > > > > This poses a problem for piglit. We want to make tests for things that > > > don't have GL_ARB_compatibility, but we can't actually ask for that. > > > When a test says > > > > > > config.supports_gl_core_version = 31; > > > > > > Waffle uses glXCreateContextAttribsARB to create 3.1 context. It then > > > checks to see whether or not that context has GL_ARB_compatibility. If > > > it does, then context creation fails. Waffle will then try to create > > > some other kind of context if you set another supports_gl_* value. > > > > > Waffle itself does not check for GL_ARB_compat when creating a context. > The > > decision of what to do if the extension is available is left to the user > - > > which imho is the only sane solution. > > > > From the man page > > If the chosen API is <constant>WAFFLE_CONTEXT_OPENGL</constant> > > and version 3.1 is requested, > > then the returned context may implement any of: > > > > * Version 3.1, with or without the GL_ARB_compatibility extension. > > * The core profile of version 3.2 or greater. > > > > > I think this is a bug in Waffle (or maybe piglit's usage of Waffle). > If > > > a 3.1 context with GL_ARB_compatibility was created, Waffle should try > > > again by asking for a 3.2 core profile. > > > > > >> This seems to come from piglit_wfl_framework.c:special_case_gl_31. > > >> > > >> Unfortunately I know ~nothing about the subtleties of all this, but > > >> what's the way forward? Is the driver at fault? Piglit? FTR, changing > > >> the supports_gl_core_version to 32 fixes it. > > This is not a bug in Waffle. Waffle does the only sane and correct > thing. Waffle could do the thing you want only if the OpenGL API were > more friendly to middleware libraries. Specifically, OpenGL needs to > provide an API with an explicit context parameter. > > The bug is in Piglit. > > I wrote a fix that gives Ilia the behavior he wants. I'm regression > testing the fix right now. > _______________________________________________ > Piglit mailing list > [email protected] > http://lists.freedesktop.org/mailman/listinfo/piglit >
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