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comparison ext/guichan-0.8.1/examples/openglallegro.hpp @ 0:4a0efb7baf70

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* Datasets becomes the new trunk and retires after that :-)
author mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
date Sun, 29 Jun 2008 18:44:17 +0000
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1 /*
2 * Code that sets up an OpenGL application with Guichan using the
3 * Guichan OpenGL back end and the Allegro back end (as OpenGL cannot
4 * load images nor check for user input an additional back end needs
5 * to be used).
6 */
7
8 // The openglallegroimageloader.hpp header file needs to be included
9 // in order to get the image loader that uses OpenGL and Allegro.
10 #include <guichan/opengl/openglallegroimageloader.hpp>
11 #include <guichan.hpp>
12 #include <guichan/opengl.hpp>
13 #include <guichan/allegro.hpp>
14
15 namespace openglallegro
16 {
17 // All back ends contain objects to make Guichan work on a
18 // specific target. They are a Graphics object to make Guichan
19 // able to draw itself using OpenGL, an input objec to make
20 // Guichan able to get user input using Allegro and an ImageLoader
21 // object to make Guichan able to load images using OpenGL and Allegro.
22 gcn::OpenGLGraphics* graphics;
23 gcn::AllegroInput* input;
24 gcn::OpenGLAllegroImageLoader* imageLoader;
25
26 /**
27 * Initialises the OpenGL and Allegro application. This function creates the global
28 * Gui object that can be populated by various examples.
29 */
30 void init()
31 {
32 // We simply initialise OpenGL and Allegro as we would do with any OpenGL
33 // and Allegro application.
34 allegro_init();
35
36 install_allegro_gl();
37
38 allegro_gl_clear_settings();
39 allegro_gl_set (AGL_COLOR_DEPTH, 32);
40 allegro_gl_set (AGL_Z_DEPTH, 24);
41 allegro_gl_set (AGL_FULLSCREEN, TRUE);
42 allegro_gl_set (AGL_DOUBLEBUFFER, 1);
43 allegro_gl_set (AGL_SUGGEST, AGL_COLOR_DEPTH | AGL_Z_DEPTH | AGL_DOUBLEBUFFER);
44
45 set_gfx_mode(GFX_OPENGL_WINDOWED, 640, 480, 0, 0);
46
47 install_keyboard();
48 install_mouse();
49 install_timer();
50
51 glViewport(0, 0, 640, 480);
52 glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
53
54 // Now it's time to initialise the Guichan OpenGL back end
55 // and the Guichan Allegro back end.
56
57 imageLoader = new gcn::OpenGLAllegroImageLoader();
58 // The ImageLoader Guichan should use needs to be passed to the Image object
59 // using a static function.
60 gcn::Image::setImageLoader(imageLoader);
61 graphics = new gcn::OpenGLGraphics();
62 // We need to tell the OpenGL Graphics object how big the screen is.
63 graphics->setTargetPlane(640, 480);
64 input = new gcn::AllegroInput();
65
66 // Now we create the Gui object to be used with this OpenGL
67 // and Allegro application.
68 globals::gui = new gcn::Gui();
69 // The Gui object needs a Graphics to be able to draw itself and an Input
70 // object to be able to check for user input. In this case we provide the
71 // Gui object with OpenGL and Allegro implementations of these objects hence
72 // making Guichan able to utilise OpenGL and Allegro.
73 globals::gui->setGraphics(graphics);
74 globals::gui->setInput(input);
75 }
76
77 /**
78 * Halts the OpenGL and Allegro application.
79 */
80 void halt()
81 {
82 delete globals::gui;
83
84 delete imageLoader;
85 delete input;
86 delete graphics;
87 }
88
89 /**
90 * Runs the OpenGL and Allegro application.
91 */
92 void run()
93 {
94 while(!key[KEY_ESC])
95 {
96 // Now we let the Gui object perform its logic.
97 globals::gui->logic();
98 // Now we let the Gui object draw itself.
99 globals::gui->draw();
100
101 // Now we draw the mouse cursor.
102 allegro_gl_set_allegro_mode();
103 show_mouse(screen);
104 algl_draw_mouse();
105 allegro_gl_unset_allegro_mode();
106
107 // Finally we update the screen.
108 allegro_gl_flip();
109 }
110 }
111 }