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annotate ext/guichan-0.8.1/examples/openglsdl.hpp @ 17:ae46cee19e76

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- add geometric renderer, can currently only draw liens. - thanks to l4rs for some help
author spq@33b003aa-7bff-0310-803a-e67f0ece8222
date Mon, 07 Jul 2008 00:27:59 +0000
parents 4a0efb7baf70
children
rev   line source
0
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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1 /*
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2 * Code that sets up an OpenGL application with Guichan using the
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3 * Guichan OpenGL back end and the SDL back end (as OpenGL cannot
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4 * load images nor check for user input an additional back end needs
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5 * to be used).
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6 */
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7
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8 #include <guichan.hpp>
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9 #include <guichan/opengl.hpp>
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10 // The openglsdlimageloader.hpp header file needs to be included
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11 // in order to get the image loader that uses OpenGL and SDL.
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12 #include <guichan/opengl/openglsdlimageloader.hpp>
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13 #include <guichan/sdl.hpp>
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14
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15 namespace openglsdl
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16 {
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17 bool running = true;
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18 SDL_Surface* screen;
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19
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20 // All back ends contain objects to make Guichan work on a
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21 // specific target. They are a Graphics object to make Guichan
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22 // able to draw itself using OpenGL, an input objec to make
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23 // Guichan able to get user input using SDL and an ImageLoader
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24 // object to make Guichan able to load images using OpenGL and SDL.
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25 gcn::OpenGLGraphics* graphics;
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26 gcn::SDLInput* input;
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27 gcn::OpenGLSDLImageLoader* imageLoader;
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28
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29 /**
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30 * Initialises the OpenGL and SDL application. This function creates the global
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31 * Gui object that can be populated by various examples.
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32 */
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33 void init()
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34 {
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35 // We simply initialise OpenGL and SDL as we would do with any OpenGL
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36 // and SDL application.
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37 SDL_Init(SDL_INIT_VIDEO);
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38 SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
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39
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40 screen = SDL_SetVideoMode(640, 480, 32, SDL_HWSURFACE | SDL_OPENGL | SDL_HWACCEL);
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41
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42 glViewport(0, 0, 640, 480);
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43 glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
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44
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45 // We want unicode for the SDLInput object to function properly.
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46 SDL_EnableUNICODE(1);
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47 // We also want to enable key repeat.
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48 SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL);
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49
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50 // Now it's time to initialise the Guichan OpenGL back end
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51 // and the Guichan SDL back end.
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52
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53 imageLoader = new gcn::OpenGLSDLImageLoader();
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54 // The ImageLoader Guichan should use needs to be passed to the Image object
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55 // using a static function.
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56 gcn::Image::setImageLoader(imageLoader);
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57 graphics = new gcn::OpenGLGraphics();
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58 // We need to tell the OpenGL Graphics object how big the screen is.
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59 graphics->setTargetPlane(640, 480);
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60 input = new gcn::SDLInput();
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61
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62 // Now we create the Gui object to be used with this OpenGL
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63 // and SDL application.
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64 globals::gui = new gcn::Gui();
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65 // The Gui object needs a Graphics to be able to draw itself and an Input
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66 // object to be able to check for user input. In this case we provide the
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67 // Gui object with OpenGL and SDL implementations of these objects hence
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68 // making Guichan able to utilise OpenGL and SDL.
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69 globals::gui->setGraphics(graphics);
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70 globals::gui->setInput(input);
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71 }
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72
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73 /**
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74 * Halts the OpenGL and SDL application.
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75 */
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76 void halt()
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77 {
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78 delete globals::gui;
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79
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80 delete imageLoader;
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81 delete input;
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82 delete graphics;
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83
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84 SDL_Quit();
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85 }
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86
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87 /**
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88 * Runs the OpenGL and SDL application.
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89 */
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90 void run()
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91 {
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92 // The main loop
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93 while(running)
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94 {
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95 // Check user input
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96 SDL_Event event;
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97 while(SDL_PollEvent(&event))
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98 {
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99 if (event.type == SDL_KEYDOWN)
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100 {
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101 if (event.key.keysym.sym == SDLK_ESCAPE)
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102 {
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103 running = false;
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104 }
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105 if (event.key.keysym.sym == SDLK_f)
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106 {
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107 if (event.key.keysym.mod & KMOD_CTRL)
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108 {
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109 // Works with X11 only
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110 SDL_WM_ToggleFullScreen(screen);
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111 }
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112 }
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113 }
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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114 else if(event.type == SDL_QUIT)
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115 {
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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116 running = false;
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117 }
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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118
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119 // After we have manually checked user input with SDL for
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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120 // any attempt by the user to halt the application we feed
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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121 // the input to Guichan by pushing the input to the Input
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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122 // object.
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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123 input->pushInput(event);
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124 }
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125 // Now we let the Gui object perform its logic.
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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126 globals::gui->logic();
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127 // Now we let the Gui object draw itself.
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128 globals::gui->draw();
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129 // Finally we update the screen.
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130 SDL_GL_SwapBuffers();
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131 }
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132 }
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133 }