MESA_configless_context does not specify the interaction with
QueryContext at all, and the code to generate an error in this case
predates the Mesa extension. Since EGL_NO_CONFIG_{KHR,MESA} are
numerically identical there's no way to distinguish which one the
application asked for, so use the KHR behaviour.
Signed-off-by: Adam Jackson <a...@redhat.com>
---
src/egl/main/eglcontext.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/src/egl/main/eglcontext.c b/src/egl/main/eglcontext.c
index 58740c3..7eac79a 100644
--- a/src/egl/main/eglcontext.c
+++ b/src/egl/main/eglcontext.c
@@ -538,9 +538,14 @@ _eglQueryContext(_EGLDriver *drv, _EGLDisplay *dpy,
_EGLContext *c,
switch (attribute) {
case EGL_CONFIG_ID:
- if (!c->Config)
- return _eglError(EGL_BAD_ATTRIBUTE, "eglQueryContext");
- *value = c->Config->ConfigID;
+ /*
+ * From EGL_KHR_no_config_context:
+ *
+ * "Querying EGL_CONFIG_ID returns the ID of the EGLConfig with
+ * respect to which the context was created, or zero if created
+ * without respect to an EGLConfig."
+ */
+ *value = c->Config ? c->Config->ConfigID : 0;
break;
case EGL_CONTEXT_CLIENT_VERSION:
*value = c->ClientMajorVersion;
--
2.9.3
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