1 # This file is part of NIT (http://www.nitlanguage.org).
3 # Licensed under the Apache License, Version 2.0 (the "License");
4 # you may not use this file except in compliance with the License.
5 # You may obtain a copy of the License at
7 # http://www.apache.org/licenses/LICENSE-2.0
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS,
11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 # See the License for the specific language governing permissions and
13 # limitations under the License.
15 # Abstract display services
21 import display_linux
is conditional
(linux
)
22 import display_android
is conditional
(android
)
24 # Should Gamnit be more verbose?
25 fun debug_gamnit
: Bool do return false
27 # General display class, is sized and drawable
30 # Width of the display, in pixels
31 fun width
: Int is abstract
33 # Height of the display, in pixels
34 fun height
: Int is abstract
36 # Aspect ratio of the screen, `width / height`
37 fun aspect_ratio
: Float do return width
.to_f
/ height
.to_f
39 # Is the cursor locked et the center of the screen?
40 var lock_cursor
= false is writable
42 # Is the cursor visible?
44 # Only affects the desktop implementations.
45 var show_cursor
: Bool = true is writable
47 # Number of bits used for the red value in the color buffer
48 fun red_bits
: Int do return 8
50 # Number of bits used for the green value in the color buffer
51 fun green_bits
: Int do return 8
53 # Number of bits used for the blue value in the color buffer
54 fun blue_bits
: Int do return 8
56 # Prepare this display
58 # The implementation varies per platform.
61 # Close this display and free underlying resources
63 # The implementation varies per platform.
66 # Flip the display buffers
68 # The implementation varies per platform.
71 # Loop on available events and feed them back to the app
73 # The implementation varies per platform.
74 fun feed_events
do end