There is a user somewhere that tests it before its initial set.
---
src/glx/dri2_glx.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/src/glx/dri2_glx.c b/src/glx/dri2_glx.c
index 9347611..73d11f1 100644
--- a/src/glx/dri2_glx.c
+++ b/src/glx/dri2_glx.c
@@ -194,6 +194,7 @@ dri2CreateDrawable(__GLXscreenConfigs * psc,
pdraw->base.psc = psc;
pdraw->bufferCount = 0;
pdraw->swap_interval = 1; /* default may be overridden below */
+ pdraw->have_back = 0;
if (psc->config)
psc->config->configQueryi(psc->__driScreen, "vblank_mode", &vblank_mode);
--
1.7.0.4
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