glcontext: Add internal get_clipped_version function

It is useful for backends to get user set preferences while
ensuring the correctness of the result, which will be always
greater or equal than the minimum version provided

diff --git a/gdk/gdkglcontext.c b/gdk/gdkglcontext.c
index 8f9fe2539690603db729e81838b6fdbe8509c980..484dee32000540a59c7abfa239565120bd6a97ee 100644 (file)
--- a/gdk/gdkglcontext.c
+++ b/gdk/gdkglcontext.c
@@ -1113,6 +1113,24 @@ gdk_gl_context_get_required_version (GdkGLContext *context,
   else
     min = default_minor;
 
+void
+gdk_gl_context_get_clipped_version (GdkGLContext *context,
+                                    int           min_major,
+                                    int           min_minor,
+                                    int          *major,
+                                    int          *minor)
+{
+  GdkGLContextPrivate *priv = gdk_gl_context_get_instance_private (context);
+  int maj = min_major, min = min_minor;
+
+  g_return_if_fail (GDK_IS_GL_CONTEXT (context));
+
+  if (priv->major > maj || (priv->major == maj && priv->minor > min))
+    {
+      maj = priv->major;
+      min = priv->minor;
+    }
+
   if (major != NULL)
     *major = maj;
   if (minor != NULL)

diff --git a/gdk/gdkglcontextprivate.h b/gdk/gdkglcontextprivate.h
index 0a3739f090fef8a4dba9a4da51acc958f5de2ad0..b97d07f34fb4313ec935023b6b8c43a74c760859 100644 (file)
--- a/gdk/gdkglcontextprivate.h
+++ b/gdk/gdkglcontextprivate.h
@@ -117,6 +117,11 @@ gboolean                gdk_gl_context_check_version            (GdkGLContext
                                                                  int              required_gl_minor,
                                                                  int              required_gles_major,
                                                                  int              required_gles_minor);
+void                    gdk_gl_context_get_clipped_version      (GdkGLContext    *context,
+                                                                 int              min_major,
+                                                                 int              min_minor,
+                                                                 int             *major,
+                                                                 int             *minor);
 
 gboolean                gdk_gl_context_has_unpack_subimage      (GdkGLContext    *context);
 void                    gdk_gl_context_push_debug_group         (GdkGLContext    *context,