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annotate mde/input/input.d @ 9:1885a9080f2a

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Joystick button input now works with config. committer: Diggory Hardy <diggory.hardy@gmail.com>
author Diggory Hardy <diggory.hardy@gmail.com>
date Wed, 30 Jan 2008 11:33:56 +0000
parents f63f4f41a2dc
children 4c3575400769
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1 /**
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2 * This module contains the interface to the input system; it should be the only module of the
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3 * input package imported from outside this package.
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4 */
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5 module mde.input.input;
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7 // package imports
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8 import mde.input.config;
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9 public import mde.input.exception;
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10
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11 // sdl imports
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12 import derelict.sdl.events;
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13
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14 import tango.util.log.Log : Log, Logger;
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16 public Input input; /// Global instance of input.
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17 static this() {
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18 input = new Input();
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19 }
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21 /// Class encapsulating all input functionality.
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22 class Input
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23 {
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24 /// Typedef for all indexes (type is uint).
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25 typedef uint inputID;
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26 alias void delegate(inputID, bool) ButtonCallback;
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27 alias void delegate(inputID, real) AxisCallback;
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28 alias void delegate(inputID, real,real) MouseCallback;
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29
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30 /** Get key status at this ID.
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31 *
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32 * Returns: value (true = down, false = up) or false if no value at this ID. */
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33 bool getButton (inputID id) {
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34 assert (this is input);
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35 bool* retp = id in button;
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36 if (retp) return *retp;
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37 else return false;
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38 }
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39 /** Get axis status at this ID.
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40 *
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41 * Returns: value (range -1.0 .. 1.0) or 0.0 if no value at this ID. */
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42 real getAxis (inputID id) {
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43 real* retp = id in axis;
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44 if (retp) return *retp;
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45 else return 0.0;
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46 }
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47 /** Get mouse pointer position in screen coordinates.
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48 *
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49 * Window managers only support one mouse, so there will only be one screen coordinate.
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50 * Unlike everything else, this is not configurable.
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51 */
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52 void mouseScreenPos (out uint x, out uint y) {
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53 x = mouse_x; y = mouse_y;
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54 }
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55 /** Get relative mouse position (also for joystick balls).
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56 *
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57 * Future: Converts to a real via sensitivity settings (defaults may be set and overriden per item).
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58 *
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59 * To avoid confusion over the ID here, the idea is for the input-layer upward to support
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60 * multiple mice, in case future platforms do.
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61 * Also joystick balls (supported by SDL) can be used in the same way as a mouse for relative
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62 * positions.
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63 */
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64 void mouseRelativePos (inputID id, out real x = 0.0, out real y = 0.0) {
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65 RelPair* rp = id in axis_rel;
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66 if (rp) {
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67 x = rp.x; y = rp.y;
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68 }
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69 }
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70 // /// Is this modifier on?
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71 //bool modifierStatus (inputID id);
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73 /** Adds a callback delegate for key events (both DOWN and UP) with this ID.
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74 *
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75 * Delegate receives event status.
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76 */
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77 void addButtonCallback (inputID id, ButtonCallback dg) {
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78 buttonCallbacks[id] = dg;
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79 }
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80
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81 /** Adds a callback delegate for axis events with this ID.
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82 *
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83 * Delegate receives event status.
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84 */
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85 void addAxisCallback (inputID id, AxisCallback dg) {
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86 axisCallbacks[id] = dg;
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87 }
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88
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89 /** Adds a callback delegate for mouse motion/joystick ball events with this ID.
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90 *
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91 * Delegate receives event status. (A separate callback for mouse pointer position changes is not
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92 * necessary since this will be triggered by the same event - use mouseScreenPos from within the
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93 * function to get new screen coordinates.)
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94 */
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95 void addMouseCallback (inputID id, MouseCallback dg) {
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96 mouseCallbacks[id] = dg;
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97 }
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98
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99 /** Feed an SDL_Event struct (only uses if it's a key, mouse or joystick event).
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100 *
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101 * Other types of event functions may be added. Returns true if the event was used, false if not.
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102 */
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103 bool opCall (ref SDL_Event event) {
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104 assert (this is input);
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105 switch (event.type) {
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106 case SDL_JOYBUTTONDOWN:
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107 case SDL_JOYBUTTONUP:
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108 outQueue* p = (Config.B.JOYBUTTON | (event.jbutton.which << 12) | event.jbutton.button) in config.button;
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109 if (p) bEventOut (event.jbutton.state == 0x1, readOutQueue(*p));
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110 break;
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111
4
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112 /+
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113 case SDL_KEYDOWN:
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114 case SDL_KEYUP:
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115 outQueue* p = (Config.B.SDLKEY | event.key.keysym.sym) in config.button;
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116 if (p) eventstream.bEventOut (event.key.state == SDL_PRESSED, readOutQueue(*p));
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117 break;
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118 case SDL_MOUSEMOTION:
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119 mouse_x = event.motion.x;
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120 mouse_y = event.motion.y;
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121 outQueue* p = (Config.M.WMMOUSE) in config.mouse;
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122 if (p) eventstream.mEventOut (event.motion.xrel, event.motion.yrel, readOutQueue(*p));
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123 +/
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124 default:
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125 return false;
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126 }
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127 return true;
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128 }
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129
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130 /** Resets relative movement of mice / joystick balls to zero.
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131 *
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132 * Should be called once-per-frame if these are used, but must be called after their state has
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133 * been read (e.g. just before updating the input).
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134 */
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135 void frameReset () {
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136 foreach (rp; axis_rel) {
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137 rp.x = rp.y = 0.0;
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138 }
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139 }
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140
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141 /** Loads all configs, activating the requested id.
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142 *
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143 * Returns: true if the requested config id wasn't found.
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144 */
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145 bool loadConfig () {
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146 Config.load("conf/input.mtt"); // FIXME: filename
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147 Config* c_p = "Default" in Config.configs;
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148 if (c_p) {
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149 config = *c_p;
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150 return false;
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151 }
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152 debug logger.warn ("Config \"Default\" not found.");
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153 return true;
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154 }
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155
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156 private:
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157 // Static constructor for event stream (fills es_*_fcts tables).
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158 static this () {
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159 es_b_fcts = [ ES_B_OUT : &es_b_out ];
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160
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161 logger = Log.getLogger ("mde.input.input.Input");
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162 }
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163
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164 struct RelPair { // for mouse/joystick ball motion
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165 real x, y;
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166 static RelPair opCall (real a, real b) {
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167 RelPair ret;
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168 ret.x = a; ret.y = b;
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169 return ret;
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170 }
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171 }
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172
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173 static Logger logger;
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174
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175 Config config; // Configuration
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176
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177 bool[inputID] button; // Table of button states
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178 real[inputID] axis; // Table of axes states
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179 ushort mouse_x, mouse_y; // Current screen coords of the mouse
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180 // FIXME: might need a bit of work... at any rate defining a default ID.
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181 RelPair[inputID] axis_rel; // Table of relative mouse / joystick ball motions
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182
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183 // FIXME: these need to be more like multimaps, supporting multiple dgs (also some means of removal?)
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184 ButtonCallback[inputID] buttonCallbacks;
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185 AxisCallback[inputID] axisCallbacks;
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186 MouseCallback[inputID] mouseCallbacks;
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187
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188 //BEGIN Event stream functionality
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189 /* This section contains functions called on an event, which may modify the event (adjuster
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190 * functions), and finally output to one (or more) of the state tables (the event stream).
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191 *
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192 * Adjuster and other event functions should have a format to fit the ES_X_Func types, for X is B
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193 * (button event), A (axis event) or M (mouse relative motion event or joystick ball event).
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194 * Adjusters should call one of the xEventOut() functions with their output and the remainder of
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195 * the readOutQueue.
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196 *
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197 * To control which adjusters get called and pass parameters, a stack of sorts is used: outQueue.
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198 */
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199 //BEGIN ES Definitions
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200 /* Note: We really want an array, not a stack. We cannot edit the lists, so we can either
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201 * copy to a stack or just iterate through it as an array.
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202 */
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203 alias Config.outQueue outQueue;
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204 struct readOutQueue { // A convenient structure for reading an outQueue item by item.
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205 private Config.outQueue _q; // the queue, stored by reference to the original
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206 private uint p = 0; // current read position (start at beginning)
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207
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208 static readOutQueue opCall (Config.outQueue q) { // Static constructor
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209 readOutQueue ret;
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210 ret._q = q;
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211 return ret;
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212 }
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213 uint pop () { // Get the next element and advance. Throws an exception if there isn't another.
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214 if (p >= _q.length)
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215 throw new InputClassException ("Input: Invalid configuration: incomplete config stack");
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216 uint ret = _q[p];
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217 ++p;
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218 return ret;
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219 }
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220 debug uint next () { // Get the next element. No checks; for debug use only.
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221 return _q[p];
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222 }
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223 }
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224
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225 // These aliases are for pointers to the event functions.
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226 // These need to use "this", but cannot be delegates because they musn't be bound to a
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227 // particular instance of Input, hence this must be passed when called.
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228 alias void function (Input, bool, readOutQueue) ES_B_Func;
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229 alias void function (Input, short, readOutQueue) ES_A_Func;
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230 alias void function (Input, short, short, readOutQueue) ES_M_Func;
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231
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232 // These are the codes allowing the config to specify event functions:
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233 enum : uint {
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234 ES_B_OUT = 0x0000_0100u,
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235 ES_A_OUT = 0x0000_0200u,
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236 ES_M_OUT = 0x0000_0300u,
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237 }
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238 //END ES Definitions
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239
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240 // ES Data:
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241 // These are the tables for looking up which event function to call.
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242 static ES_B_Func[uint] es_b_fcts;
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243 static ES_A_Func[uint] es_a_fcts;
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244 static ES_M_Func[uint] es_m_fcts;
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245
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246 //BEGIN ES Functions
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247 // These 3 functions pass an event to the appropriate event function (adjuster or output func).
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248 // They are used to start and continue an event stream.
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249 const EVCONF_ERR = "Input: Invalid configuration: bad event function code";
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250 void bEventOut (bool b, readOutQueue s)
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251 {
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252 ES_B_Func* func = (s.pop() in es_b_fcts);
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253 if (func != null) (*func)(this, b, s);
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254 else throw new InputClassException (EVCONF_ERR);
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255 }
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256 void aEventOut (short x, readOutQueue s)
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257 {
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258 ES_A_Func* func = (s.pop() in es_a_fcts);
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259 if (func != null) (*func)(this, x, s);
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260 else throw new InputClassException (EVCONF_ERR);
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261 }
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262 void mEventOut (short x, short y, readOutQueue s)
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263 {
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264 ES_M_Func* func = (s.pop() in es_m_fcts);
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265 if (func != null) (*func)(this, x, y, s);
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266 else throw new InputClassException (EVCONF_ERR);
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267 }
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268
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269 // The remaining functions are the stream functions, for adjusting and outputting an event.
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270 // They need to work like non-static functions, but are called via a function pointer, hencne
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271 // should be static with their first parameter being instead of this.
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272
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273 // Simple output function
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274 static void es_b_out (Input myThis, bool b, readOutQueue s) {
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275 inputID id = cast(inputID) s.pop();
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276
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277 myThis.button[id] = b;
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278
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279 ButtonCallback* cb_p = id in myThis.buttonCallbacks;
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280 if (cb_p) (*cb_p) (id, b);
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281 }
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282 // Adjuster to check modifier keys
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283 void es_b_modifier (Input myThis, bool b, readOutQueue s);
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284
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285 /* Simple output function
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286
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287 Adds 1-2 items on the stack.
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288 */
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289 void es_a_out (Input myThis, short x, readOutQueue s) {
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290 real y = x;
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291 uint conf = s.pop();
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292 enum : uint {
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293 HALF_RANGE = 0x8000_0000u,
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294 SENSITIVITY = 0x0080_0000u,
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295 }
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296 // Convert ranges into standard intervals (with or without reverse values)
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297 if (conf & HALF_RANGE) y = (y + 32767.0) * 1.5259254737998596e-05; // range 0.0 - 1.0
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298 else y *= 3.0518509475997192e-05; // range -1.0 - 1.0
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299 real a;
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300 if (conf & SENSITIVITY) a = s.pop();
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301 /+ When a global sensitivity is available (possibly only use if it's enabled)...
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302 else a = axis.sensitivity;
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303 y = sign(y) * pow(abs(y), a); // sensitivity adjustment by a +/
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304 myThis.axis[cast(inputID) s.pop()] = y;
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305 }
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306
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307 // Simple output function
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308 void es_m_out (Input myThis, short x, short y, readOutQueue s) {
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309 myThis.axis_rel[cast(inputID) s.pop()] = RelPair(x,y);
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310 }
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311 //END ES Functions
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312 //END Event stream functionality
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313 }