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| ALLEGRO_FULLSCREEN on OSX |
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waden87
Member #10,051
August 2008
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Hi, I've been unable to create a fullscreen display using ALLEGRO_FULLSCREEN on OSX. I've read a post found somewhere through google that confirmed this was an open issue a couple of years ago. I read the change log for 5.2 (April 2016?) that listed some fixes to full screen under the Mac OSX section. However, al_create_display is returning a NULL pointer for me. I am currently using 5.2.0.1 and the same code works on Windows. Sorry if this is the wrong place to post this or if it's a duplicate post - I searched the forums for "FULLSCREEN" and didn't see anything that matched my issue. Thanks! |
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Neil Roy
Member #2,229
April 2002
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Have you tried "ALLEGRO_FULLSCREEN_WINDOW" perhaps? Which is like a Fullscreen, only it creates a window the size of your display, with no border. I prefer it over fullscreen myself as you can more quickly switch between that and your desktop or whatever. --- |
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waden87
Member #10,051
August 2008
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This looks like it might work for me. Thanks for the suggestion! |
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Neil Roy
Member #2,229
April 2002
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Awesome! Let us know how that works out. Out of curiosity, what are you working on? --- |
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waden87
Member #10,051
August 2008
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I'm working on a game based on Allegro. Your typical endless side project |
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Gideon Weems
Member #3,925
October 2003
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waden87
Member #10,051
August 2008
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I'm actually scaling up from 480x270 to 960x540 on my mac that has a display size of 1440x900. I guess I need to create an allegro display equal to my physical display and just center the main bitmap on the allegro display. 1 al_set_target_bitmap (draw_buffer); //draw buffer is 480x270
2
3/* draw some primitives and bitmaps */
4
5
6 al_set_target_bitmap ( al_get_backbuffer ( main_display ) );//display is 960 x 540
7
8#if 0
9 al_draw_scaled_bitmap ( draw_buffer,
10 0,
11 0,
12 SCREEN_WIDTH, //480
13 SCREEN_HEIGHT,//270
14 0,
15 0,
16 MAIN_DISPLAY_WIDTH,//960
17 MAIN_DISPLAY_HEIGHT,//540
18 0);
19#else
20// calculate scaling factor
21 sx = MAIN_DISPLAY_WIDTH / SCREEN_WIDTH;
22 sy = MAIN_DISPLAY_HEIGHT / SCREEN_HEIGHT;
23 scale = G_MIN(sx, sy);
24
25 // calculate how much the buffer should be scaled
26 scaleW = SCREEN_WIDTH * scale;
27 scaleH = SCREEN_HEIGHT * scale;
28 scaleX = (MAIN_DISPLAY_WIDTH - scaleW) / 2;
29 scaleY = (MAIN_DISPLAY_HEIGHT - scaleH) / 2;
30
31 al_draw_scaled_bitmap(draw_buffer,
32 0,
33 0,
34 SCREEN_WIDTH,//480
35 SCREEN_HEIGHT,//270
36 scaleX, //0
37 scaleY, //0
38 scaleW,//960
39 scaleH,//540
40 0);
41#endif
42 al_flip_display ();
The key thing I was missing earlier was that I was not matching the allegro display size with my physical screen size. With the code below I can center the final bitmap in the display with a letterbox effect. 1 num_full_displays = al_get_num_display_modes();
2 main_display_return = al_get_display_mode(0, &main_display_mode);
3 main_display = al_create_display ( main_display_mode.width,
4 main_display_mode.height );
5
6
7 display_width = al_get_display_width(main_display);
8 display_height = al_get_display_height(main_display);
9
10 // calculate scaling factor
11 sx = display_width / SCREEN_WIDTH;
12 sy = display_height / SCREEN_HEIGHT;
13 scale = G_MIN(sx, sy);
14
15 // calculate how much the buffer should be scaled
16 scaleW = SCREEN_WIDTH * scale;
17 scaleH = SCREEN_HEIGHT * scale;
18 scaleX = (display_width - scaleW) / 2;
19 scaleY = (display_height - scaleH) / 2;
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Gideon Weems
Member #3,925
October 2003
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. An odd thing occurs when I use the ALLEGRO_FULLSCREEN_WINDOW option on OSX. I'm drawing on a bitmap that is 480 x 270 which is then scaled up to an Allegro display that is 1920 x 1080. It looks like some additional space is added to the bottom of the display which flickers between black and white. I have some code that displays the mouse position and it is able to go beyond what I specified for the vertical size of the display. I'll try to post some pictures later of the problem.