+# This file is part of NIT (http://www.nitlanguage.org).
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Abstract display services
+module display
+
+import ::glesv2
+
+# Should Gamnit be more verbose?
+fun debug_gamnit: Bool do return false
+
+# General display class, is sized and drawable
+class GamnitDisplay
+
+ # Width of the display, in pixels
+ fun width: Int is abstract
+
+ # Height of the display, in pixels
+ fun height: Int is abstract
+
+ # Prepare this display
+ #
+ # The implementation varies per platform.
+ fun setup is abstract
+
+ # Close this display and free underlying resources
+ #
+ # The implementation varies per platform.
+ fun close do end
+
+ # Flip the display buffers
+ #
+ # The implementation varies per platform.
+ fun flip do end
+end