Mercurial > fife-parpg

comparison ext/guichan-0.8.2/examples/allegro.hpp @ 378:64738befdf3b

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bringing in the changes from the build_system_rework branch in preparation for the 0.3.0 release. This commit will require the Jan2010 devkit. Clients will also need to be modified to the new way to import fife.
author vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
date Mon, 11 Jan 2010 23:34:52 +0000
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377:fe6fb0e0ed23 378:64738befdf3b
1 /*
2 * Code that sets up an Allegro application with Guichan using the
3 * Guichan Allegro back end.
4 */
5
6 #include <guichan.hpp>
7 #include <guichan/allegro.hpp>
8
9 namespace allegro
10 {
11 BITMAP* screenBuffer;
12
13 // All back ends contain objects to make Guichan work on a
14 // specific target - in this case Allegro - and they are a Graphics
15 // object to make Guichan able to draw itself using Allegro, an
16 // input objec to make Gopenglsdluichan able to get user input using Allegro
17 // and an ImageLoader object to make Guichan able to load images
18 // using Allegro.
19 gcn::AllegroGraphics* graphics;
20 gcn::AllegroInput* input;
21 gcn::AllegroImageLoader* imageLoader;
22
23 /**
24 * Initialises the Allegro application. This function creates the global
25 * Gui object that can be populated by various examples.
26 */
27 void init()
28 {
29 // We simply initialise Allegro as we would do with any Allegro application.
30 allegro_init();
31
32 int bpp = desktop_color_depth();
33 if (bpp == 0)
34 {
35 bpp = 16;
36 }
37
38 set_color_depth(bpp);
39
40 if (set_gfx_mode(GFX_AUTODETECT_WINDOWED, 640, 480, 0, 0))
41 {
42 if (set_gfx_mode(GFX_AUTODETECT, 640, 480, 0, 0))
43 {
44 throw GCN_EXCEPTION("Unable to set graphics mode");
45 }
46 }
47
48 screenBuffer = create_bitmap(SCREEN_W, SCREEN_H);
49
50 if (screenBuffer == NULL)
51 {
52 throw GCN_EXCEPTION("Unable to create a screen buffer");
53 }
54
55 install_keyboard();
56 install_mouse();
57 install_timer();
58
59 // Now it's time to initialise the Guichan Allegro back end.
60
61 imageLoader = new gcn::AllegroImageLoader();
62 // The ImageLoader Guichan should use needs to be passed to the Image object
63 // using a static function.
64 gcn::Image::setImageLoader(imageLoader);
65 graphics = new gcn::AllegroGraphics();
66 // Set the target for the graphics object to be the doublebuffer
67 // for the screen. Drawing to the screen directly is not a good
68 // idea, as it will produce flicker, unless you use page flipping.
69 graphics->setTarget(screenBuffer);
70 input = new gcn::AllegroInput();
71
72 // Now we create the Gui object to be used with this Allegro application.
73 globals::gui = new gcn::Gui();
74 // The Gui object needs a Graphics to be able to draw itself and an Input
75 // object to be able to check for user input. In this case we provide the
76 // Gui object with Allegro implementations of these objects hence making Guichan
77 // able to utilise Allegro.
78 globals::gui->setGraphics(graphics);
79 globals::gui->setInput(input);
80 }
81
82 /**
83 * Halts the Allegro application.
84 */
85 void halt()
86 {
87 delete globals::gui;
88
89 delete imageLoader;
90 delete input;
91 delete graphics;
92
93 destroy_bitmap(screenBuffer);
94 }
95
96 /**
97 * Runs the Allegro application.
98 */
99 void run()
100 {
101 while(!key[KEY_ESC])
102 {
103 // Now we let the Gui object perform its logic.
104 globals::gui->logic();
105 // Now we let the Gui object draw itself.
106 globals::gui->draw();
107
108 // We draw the mouse pointer manually, as Allegro's mouse
109 // drawing code is so wierd.
110 draw_sprite(screenBuffer, mouse_sprite, mouse_x, mouse_y);
111
112 // Finally we update the screen.
113 blit(screenBuffer, screen, 0, 0, 0, 0, SCREEN_W, SCREEN_H);
114 }
115 }
116 }