glx: Require depth > 12 for GLX visuals
fb is happy to do TrueColor to 8bpp drawables, but mesa is not. Depth 12 is the biggest pseudocolor anyone ever really did, and 15 is the least truecolor. Without this Xvfb at depth 8 would "have" GLX, but no vendors would actually back any of the screens. libGL will attempt to call GLXQueryServerString to figure out the GLX version, and vnd will throw an error because there's no vendor to dispatch that to, and then clients crash. Signed-off-by: Adam Jackson <ajax@redhat.com>
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@ -289,8 +289,9 @@ checkScreenVisuals(void)
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for (i = 0; i < screenInfo.numScreens; i++) {
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ScreenPtr screen = screenInfo.screens[i];
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for (j = 0; j < screen->numVisuals; j++) {
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if (screen->visuals[j].class == TrueColor ||
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screen->visuals[j].class == DirectColor)
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if ((screen->visuals[j].class == TrueColor ||
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screen->visuals[j].class == DirectColor) &&
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screen->visuals[j].nplanes > 12)
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return TRUE;
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}
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}
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