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annotate mde/setup/InitStage.d @ 85:56c0ddd90193

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Intermediate commit (not stable). Changes to init system.
author Diggory Hardy <diggory.hardy@gmail.com>
date Thu, 11 Sep 2008 11:33:51 +0100
parents mde/setup/init2.d@e0f1ec7fe73a
children 4d5d53e4f881
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1 /* LICENSE BLOCK
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2 Part of mde: a Modular D game-oriented Engine
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3 Copyright © 2007-2008 Diggory Hardy
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4
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5 This program is free software: you can redistribute it and/or modify it under the terms
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6 of the GNU General Public License as published by the Free Software Foundation, either
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7 version 2 of the License, or (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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10 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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11 See the GNU General Public License for more details.
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12
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13 You should have received a copy of the GNU General Public License
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14 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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16 /**************************************************************************************************
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17 * The infrastructure for handling external startup/shutdown code.
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18 *************************************************************************************************/
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19 module mde.setup.InitStage;
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20
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21 public import mde.setup.exception;
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22 import tango.util.container.HashMap;
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23 import tango.util.log.Log : Log, Logger;
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24
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25 // use as hash type for better performance than char[]
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26 alias uint StageName;
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27 StageName toStageName (char[4] x) {
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28 return *cast(uint*) x.ptr; // NOTE - little hack to read as a uint
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29 }
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30
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31 /** Initialization and cleanup functions for one stage.
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32 *
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33 * The init and cleanup functions should return the new StageState. Returning ERROR does not
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34 * indicate that the program should abort but that the module in question is not usable and
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35 * that init & cleanup should not be called. Throwing an exception sets the state to ERROR (or
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36 * the value passed to an InitStageException) and indicates that the program should abort.
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37 * If the program aborts, all stages with state ACTIVE have their cleanup run (as with a normal
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38 * shutdown).
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39 *
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40 * Not setting a cleanup function will result in the state being left at ACTIVE on shutdown, so
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41 * if a second initialization occurs (not currently possible), init will not be re-run. */
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42 struct InitStage {
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43 StageState delegate() init; // the initialization function
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44 StageState delegate() cleanup; // the associated cleanup function
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45 StageName[] depends; // anything function depends on completing before its run
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46 StageName[] rdepends; // reverse dependencies, set during init
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47 StageState state = StageState.INACTIVE;
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48 }
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49
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50 /// Add a stage to be initialized.
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51 void addInitStage (char[4] name, InitStage* stage) {
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52 stages[toStageName(name)] = stage;
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53 }
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54 /// Add a stage to be initialized.
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55 void addInitStage (char[4] name, StageState function() init, StageState function() cleanup = null, char[4][] depends = null) {
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56 StageState delegate() i,c;
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57 i.funcptr = init;
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58 c.funcptr = cleanup;
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59 addInitStage (name, i, c, depends);
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60 }
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61 /// Add a stage to be initialized.
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62 void addInitStage (char[4] name, StageState delegate() init, StageState delegate() cleanup = null, char[4][] depends = null) {
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63 InitStage* stage = new InitStage;
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64 (*stage).init = init;
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65 stage.cleanup = cleanup;
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66 stage.depends.length = depends.length;
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67 foreach (i,d; depends)
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68 stage.depends[i] = toStageName(d);
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69 stages[toStageName(name)] = stage;
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70 }
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71
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72 package HashMap!(StageName,InitStage*) stages;
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73
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74 static this () {
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75 stages = new typeof(stages);
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76 logger = Log.getLogger ("mde.setup.InitStage");
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77 }
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78 Logger logger;
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81
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82 /**************************************************************************************************
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83 * Initialization functions.
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84 *************************************************************************************************/
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85 import imde = mde.imde;
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86 import mde.input.Input;
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87 import mde.setup.Screen;
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88 import mde.input.joystick;
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89 import mde.font.font;
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90
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91 static this() {
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92 addInitStage ("Inpt", &initInput);
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93 addInitStage ("SSDL", &Screen.init, &Screen.cleanup );
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94 addInitStage ("SJoy", &openJoysticks, &closeJoysticks, ["SSDL"]);
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95 addInitStage ("SWnd", &Screen.initWindow, null, ["SSDL"]);
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96 addInitStage ("Font", &FontStyle.initialize, &FontStyle.cleanup);
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97 }
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98
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99 StageState initInput () {
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100 imde.input.loadConfig ("input");
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101
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102 // Quit on escape. NOTE: quit via SDL_QUIT event is handled completely independently!
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103 imde.input.addButtonCallback (cast(Input.inputID) 0x0u, delegate void(Input.inputID i, bool b) {
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104 if (b) {
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105 logger.info ("Quiting...");
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106 imde.run = false;
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107 }
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108 } );
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109 return StageState.ACTIVE;
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110 }