glx: Fix config chooser logic for 'mask' matching
When matching attributes using the 'mask' matching criteria, the spec says that "Only GLXFBConfigs for which the set bits of attribute include all the bits that are set in the requested value are considered. (Additional bits might be set in the attribute)." The current test returns true if the two bit masks have bits in common, specifically it matches even if the requested value has bits set that are not set in the fbconfig attribute. For example, an application asking for GLX_DRAWABLE_TYPE, GLX_PIXMAP_BIT | GLX_PBUFFER_BIT, as glxpbdemo does, will match fbconfigs that don't support pbuffer rendering, as long as they support pixmap rendering. Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
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@ -1110,6 +1110,13 @@ init_fbconfig_for_chooser(__GLcontextModes * config,
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} \
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} while ( 0 )
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/* Test that all bits from a are contained in b */
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#define MATCH_MASK(param) \
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do { \
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if ((a->param & ~b->param) != 0) \
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return False; \
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} while (0);
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/**
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* Determine if two GLXFBConfigs are compatible.
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*
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@ -1148,11 +1155,8 @@ fbconfigs_compatible(const __GLcontextModes * const a,
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MATCH_DONT_CARE(stereoMode);
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MATCH_EXACT(level);
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if (((a->drawableType & b->drawableType) == 0)
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|| ((a->renderType & b->renderType) == 0)) {
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return False;
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}
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MATCH_MASK(drawableType);
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MATCH_MASK(renderType);
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/* There is a bug in a few of the XFree86 DDX drivers. They contain
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* visuals with a "transparent type" of 0 when they really mean GLX_NONE.
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