gl: error out if the configured GL API is unsupported by our element

https://bugzilla.gnome.org/show_bug.cgi?id=759801

ext/gl/gstglbasemixer.c

@@ -489,11 +489,31 @@ gst_gl_base_mixer_decide_allocation (GstGLBaseMixer * mix, GstQuery * query)
     GST_OBJECT_UNLOCK (mix->display);
   }
 
+  {
+    GstGLAPI current_gl_api = gst_gl_context_get_gl_api (mix->context);
+    if ((current_gl_api & mix_class->supported_gl_api) == 0)
+      goto unsupported_gl_api;
+  }
+
   if (mix_class->decide_allocation)
     ret = mix_class->decide_allocation (mix, query);
 
   return ret;
 
+unsupported_gl_api:
+  {
+    GstGLAPI gl_api = gst_gl_context_get_gl_api (mix->context);
+    gchar *gl_api_str = gst_gl_api_to_string (gl_api);
+    gchar *supported_gl_api_str =
+        gst_gl_api_to_string (mix_class->supported_gl_api);
+    GST_ELEMENT_ERROR (mix, RESOURCE, BUSY,
+        ("GL API's not compatible context: %s supported: %s", gl_api_str,
+            supported_gl_api_str), (NULL));
+
+    g_free (supported_gl_api_str);
+    g_free (gl_api_str);
+    return FALSE;
+  }
 context_error:
   {
     GST_ELEMENT_ERROR (mix, RESOURCE, NOT_FOUND, ("%s", error->message),

ext/gl/gstglstereosplit.c

@@ -584,8 +584,27 @@ ensure_context (GstGLStereoSplit * self)
     GST_OBJECT_UNLOCK (self->display);
   }
 
+  {
+    GstGLAPI current_gl_api = gst_gl_context_get_gl_api (self->context);
+    if ((current_gl_api & SUPPORTED_GL_APIS) == 0)
+      goto unsupported_gl_api;
+  }
+
   return TRUE;
 
+unsupported_gl_api:
+  {
+    GstGLAPI gl_api = gst_gl_context_get_gl_api (self->context);
+    gchar *gl_api_str = gst_gl_api_to_string (gl_api);
+    gchar *supported_gl_api_str = gst_gl_api_to_string (SUPPORTED_GL_APIS);
+    GST_ELEMENT_ERROR (mix, RESOURCE, BUSY,
+        ("GL API's not compatible context: %s supported: %s", gl_api_str,
+            supported_gl_api_str), (NULL));
+
+    g_free (supported_gl_api_str);
+    g_free (gl_api_str);
+    return FALSE;
+  }
 context_error:
   {
     GST_ELEMENT_ERROR (self, RESOURCE, NOT_FOUND, ("%s", error->message),

ext/gl/gstgltestsrc.c

@@ -804,6 +804,9 @@ gst_gl_test_src_decide_allocation (GstBaseSrc * basesrc, GstQuery * query)
     GST_OBJECT_UNLOCK (src->display);
   }
 
+  if ((gst_gl_context_get_gl_api (src->context) & SUPPORTED_GL_APIS) == 0)
+    goto unsupported_gl_api;
+
   out_width = GST_VIDEO_INFO_WIDTH (&src->out_info);
   out_height = GST_VIDEO_INFO_HEIGHT (&src->out_info);
 
@@ -856,6 +859,19 @@ gst_gl_test_src_decide_allocation (GstBaseSrc * basesrc, GstQuery * query)
 
   return TRUE;
 
+unsupported_gl_api:
+  {
+    GstGLAPI gl_api = gst_gl_context_get_gl_api (src->context);
+    gchar *gl_api_str = gst_gl_api_to_string (gl_api);
+    gchar *supported_gl_api_str = gst_gl_api_to_string (SUPPORTED_GL_APIS);
+    GST_ELEMENT_ERROR (src, RESOURCE, BUSY,
+        ("GL API's not compatible context: %s supported: %s", gl_api_str,
+            supported_gl_api_str), (NULL));
+
+    g_free (supported_gl_api_str);
+    g_free (gl_api_str);
+    return FALSE;
+  }
 context_error:
   {
     GST_ELEMENT_ERROR (src, RESOURCE, NOT_FOUND, ("%s", error->message),

gst-libs/gst/gl/gstglbasefilter.c

@@ -50,7 +50,8 @@ enum
 #define gst_gl_base_filter_parent_class parent_class
 G_DEFINE_TYPE_WITH_CODE (GstGLBaseFilter, gst_gl_base_filter,
     GST_TYPE_BASE_TRANSFORM, GST_DEBUG_CATEGORY_INIT (gst_gl_base_filter_debug,
-        "glbasefilter", 0, "glbasefilter element"););
+        "glbasefilter", 0, "glbasefilter element");
+    );
 
 static void gst_gl_base_filter_finalize (GObject * object);
 static void gst_gl_base_filter_set_property (GObject * object, guint prop_id,
@@ -357,6 +358,7 @@ gst_gl_base_filter_decide_allocation (GstBaseTransform * trans,
     GstQuery * query)
 {
   GstGLBaseFilter *filter = GST_GL_BASE_FILTER (trans);
+  GstGLBaseFilterClass *filter_class = GST_GL_BASE_FILTER_GET_CLASS (filter);
   GError *error = NULL;
   gboolean new_context = FALSE;
 
@@ -389,6 +391,12 @@ gst_gl_base_filter_decide_allocation (GstBaseTransform * trans,
       gst_gl_context_thread_add (filter->context, gst_gl_base_filter_gl_stop,
           filter);
 
+    {
+      GstGLAPI current_gl_api = gst_gl_context_get_gl_api (mix->context);
+      if ((current_gl_api & filter_class->supported_gl_api) == 0)
+        goto unsupported_gl_api;
+    }
+
     gst_gl_context_thread_add (filter->context, gst_gl_base_filter_gl_start,
         filter);
 
@@ -404,6 +412,21 @@ gst_gl_base_filter_decide_allocation (GstBaseTransform * trans,
   return GST_BASE_TRANSFORM_CLASS (parent_class)->decide_allocation (trans,
       query);
 
+
+unsupported_gl_api:
+  {
+    GstGLAPI gl_api = gst_gl_context_get_gl_api (filter->context);
+    gchar *gl_api_str = gst_gl_api_to_string (gl_api);
+    gchar *supported_gl_api_str =
+        gst_gl_api_to_string (filter_class->supported_gl_api);
+    GST_ELEMENT_ERROR (filter, RESOURCE, BUSY,
+        ("GL API's not compatible context: %s supported: %s", gl_api_str,
+            supported_gl_api_str), (NULL));
+
+    g_free (supported_gl_api_str);
+    g_free (gl_api_str);
+    return FALSE;
+  }
 context_error:
   {
     GST_ELEMENT_ERROR (trans, RESOURCE, NOT_FOUND, ("%s", error->message),