[Mesa-stable] [PATCH] egl: set preserved behavior for surface only if config supports it

[Tapani Pälli]

Otherwise we can end up with mismatching behavior between config and
surface when client queries surface attributes. As example, configs
for DRI3 do not support preserved behavior but here we were setting
preserved behavior for pixmap and pbuffer.

Signed-off-by: Tapani Pälli <tapani.palli at intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98326
Cc: "12.0 13.0" <mesa-stable at lists.freedesktop.org>
---
 src/egl/main/eglsurface.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/egl/main/eglsurface.c b/src/egl/main/eglsurface.c
index eb0bdfe..8e56919 100644
--- a/src/egl/main/eglsurface.c
+++ b/src/egl/main/eglsurface.c
@@ -262,9 +262,13 @@ _eglInitSurface(_EGLSurface *surf, _EGLDisplay *dpy, EGLint type,
 {
    const char *func;
    EGLint renderBuffer = EGL_BACK_BUFFER;
-   EGLint swapBehavior = EGL_BUFFER_PRESERVED;
+   EGLint swapBehavior = EGL_BUFFER_DESTROYED;
    EGLint err;
 
+   /* Swap behavior can be preserved only if config supports this. */
+   if (conf->SurfaceType & EGL_SWAP_BEHAVIOR_PRESERVED_BIT)
+      swapBehavior = EGL_BUFFER_PRESERVED;
+
    switch (type) {
    case EGL_WINDOW_BIT:
       func = "eglCreateWindowSurface";
-- 
2.7.4