Mercurial > projects > mde
annotate mde/scheduler/runTime.d @ 23:47478557428d
Implemented drawing a very basic gl box, and only drawing when necessary.
Improvements to window resizing, and gl draws a box as a test.
Scheduler has "on request" support to redraws only when requested by an event.
committer: Diggory Hardy <diggory.hardy@gmail.com>
| author | Diggory Hardy <diggory.hardy@gmail.com> |
|---|---|
| date | Thu, 27 Mar 2008 10:58:57 +0000 |
| parents | 838577503598 |
| children | 611f7b9063c6 |
| rev | line source |
|---|---|
| 20 | 1 /* LICENSE BLOCK |
| 2 Part of mde: a Modular D game-oriented Engine | |
| 3 Copyright © 2007-2008 Diggory Hardy | |
| 4 | |
| 5 This program is free software; you can redistribute it and/or modify it under the terms of | |
| 6 the GNU General Public License, version 2, as published by the Free Software Foundation. | |
| 7 | |
| 8 This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; | |
| 9 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
| 10 See the GNU General Public License for more details. | |
| 11 | |
| 12 You should have received a copy of the GNU General Public License along | |
| 13 with this program; if not, write to the Free Software Foundation, Inc., | |
| 14 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ | |
| 15 | |
| 16 /** Scheduler | |
| 17 */ | |
| 18 module mde.scheduler.runTime; | |
| 19 | |
| 20 import tango.time.Time; | |
| 21 | |
|
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22 debug { |
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23 import tango.util.log.Log : Log, Logger; |
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24 private Logger logger; |
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25 } |
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26 static this() { |
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27 debug logger = Log.getLogger ("mde.scheduler.runTime"); |
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28 } |
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29 |
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30 /** Some enums used by per request functions. */ |
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31 enum RF_KEYS : uint { DRAW }; |
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32 |
| 20 | 33 // NOTE: Currently has no support for removing functions. To fix, assign ID and store fct pointers |
| 34 // in an associative array, returning the ID [on adding fct pointer]. | |
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35 // NOTE: support delegates or not? |
| 20 | 36 /// This class can run scheduled functions per frame or every t seconds (sim-time). |
| 37 abstract class Scheduler | |
| 38 { | |
| 39 /** The type of function pointer to be passed to the scheduler. | |
| 40 * | |
| 41 * The double $(I time) parameter gives the number of (sim) seconds since the function was last | |
| 42 * called, or zero on the first run. */ | |
| 43 alias void function (double time) scheduleFct; | |
| 44 | |
| 45 /** Add a function to be called per frame. */ | |
| 46 static void perFrame (scheduleFct fct) { | |
| 47 frameFcts ~= fct; | |
| 48 } | |
| 49 | |
| 50 /** Add a function to be called per t secs or n 100-nano-sec intevals. | |
| 51 * | |
| 52 * Since the scheduler cannot guarantee a maximum time between calls, the interval at which | |
| 53 * functions are called is always greater than or equal to the inverval specified here. Of | |
| 54 * course, the actual inteval is given when the function is run. | |
| 55 */ | |
| 56 static void perTime (double t, scheduleFct fct) { | |
| 57 perTime (TimeSpan.interval(t), fct); | |
| 58 } | |
| 59 /** ditto */ | |
| 60 static void perTime (TimeSpan n, scheduleFct fct) | |
| 61 in { assert (n > TimeSpan (0L)); } | |
| 62 body { | |
|
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63 timeFcts ~= new TimeFct (fct, n); |
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64 } |
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65 |
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66 /** Add a function to be called per requested update. |
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67 * |
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68 * A bool parameter is stored locally describing whether or not the function needs recalling, |
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69 * and is set true upon creation and when requestUpdate is called with the same key. The |
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70 * function is then called by scheduler's run() whenever this bool variable is true. |
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71 */ |
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72 static void perRequest (uint key, void function() fct) |
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73 in { |
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74 debug if ((key in requestFcts) is null) |
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75 logger.warn ("perRequest: replacing existing function with same key!"); |
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76 } |
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77 body { |
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78 requestFcts[key] = fct; |
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79 requestFctsUpdate[key] = true; |
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80 } |
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81 |
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82 /** Request an update to request function key. */ |
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83 static void requestUpdate (uint key) { |
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84 // Note: check the value for this key actually exists |
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85 bool* p = key in requestFctsUpdate; |
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86 if (p) *p = true; |
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87 else debug logger.warn ("requestUpdate called with invalid key"); |
| 20 | 88 } |
| 89 | |
| 90 /** This function should get called by the main loop, once per frame. | |
| 91 * | |
| 92 * The parameter time should be the current sim-time, using the tango.core.Types.Time enum; all | |
| 93 * time evaluations will use this. | |
| 94 */ | |
| 95 static void run (Time time) { | |
| 96 double interval; | |
| 97 | |
| 98 // Call all per-frame functions: | |
| 99 if (lastTime == Time (0L)) interval = 0.0; // 0 interval for first loop | |
| 100 else interval = (time-lastTime).interval(); | |
| 101 | |
| 102 foreach (fct; frameFcts) fct(interval); | |
| 103 | |
| 104 // Call all per-interval functions: | |
| 105 foreach (fct; timeFcts) if (time >= fct.nextCall) { | |
| 106 if (fct.nextCall == Time (0L)) interval = 0.0; // 0 interval for first call | |
| 107 else interval = (time - (fct.nextCall - fct.interval)).interval(); | |
| 108 fct.nextCall = time + fct.interval; // when to call next | |
| 109 | |
| 110 fct.fct (interval); // call | |
| 111 } | |
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112 |
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113 // Call all per-request functions: |
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114 foreach (key, fct; requestFcts) { |
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115 if (requestFctsUpdate[key]) { |
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116 fct(); |
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117 requestFctsUpdate[key] = false; |
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118 } |
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119 } |
| 20 | 120 } |
| 121 | |
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122 /* Holds details for functions called per time interval. |
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123 * Needs to be a reference type, and using a class is easiest for this. */ |
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124 private static class TimeFct { |
| 20 | 125 scheduleFct fct; // function to call |
| 126 | |
| 127 TimeSpan interval; // interval to call at | |
| 128 // Storing nextCall is more efficient than storing lastCall since only this number has to | |
| 129 // be compared to time every frame where fct is not called: | |
| 130 Time nextCall = Time (0L); | |
| 131 | |
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132 this (scheduleFct f, TimeSpan t) { |
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133 fct = f; |
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134 interval = t; |
| 20 | 135 } |
| 136 } | |
| 137 | |
| 138 private static Time lastTime = Time (0L); | |
| 139 private static scheduleFct[] frameFcts; | |
| 140 private static TimeFct[] timeFcts; | |
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141 private static void function()[uint] requestFcts; |
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142 private static bool[uint] requestFctsUpdate; // associated with requestFcts |
| 20 | 143 } |