2 * freeglut_input_devices.c
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4 * Handles miscellaneous input devices via direct serial-port access.
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5 * Proper X11 XInput device support is not yet supported.
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6 * Also lacks Mac support.
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8 * Written by Joe Krahn <krahn@niehs.nih.gov> 2005
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10 * Copyright (c) 2005 Stephen J. Baker. All Rights Reserved.
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12 * Permission is hereby granted, free of charge, to any person obtaining a
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13 * copy of this software and associated documentation files (the "Software"),
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14 * to deal in the Software without restriction, including without limitation
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15 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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16 * and/or sell copies of the Software, and to permit persons to whom the
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17 * Software is furnished to do so, subject to the following conditions:
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19 * The above copyright notice and this permission notice shall be included
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20 * in all copies or substantial portions of the Software.
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22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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23 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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25 * PAWEL W. OLSZTA OR STEPHEN J. BAKER BE LIABLE FOR ANY CLAIM, DAMAGES OR
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26 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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27 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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28 * DEALINGS IN THE SOFTWARE.
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31 #ifdef HAVE_CONFIG_H
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32 # include "config.h"
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35 #include <GL/freeglut.h>
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36 #include "freeglut_internal.h"
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38 typedef struct _serialport SERIALPORT;
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41 /********************* Dialbox definitions ***********************/
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43 #define DIAL_NUM_VALUATORS 8
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45 /* dial parser state machine states */
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46 #define DIAL_NEW (-1)
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47 #define DIAL_WHICH_DEVICE 0
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48 #define DIAL_VALUE_HIGH 1
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49 #define DIAL_VALUE_LOW 2
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51 /* dial/button box commands */
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52 #define DIAL_INITIALIZE 0x20
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53 #define DIAL_SET_LEDS 0x75
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54 #define DIAL_SET_TEXT 0x61
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55 #define DIAL_SET_AUTO_DIALS 0x50
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56 #define DIAL_SET_AUTO_DELTA_DIALS 0x51
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57 #define DIAL_SET_FILTER 0x53
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58 #define DIAL_SET_BUTTONS_MOM_TYPE 0x71
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59 #define DIAL_SET_AUTO_MOM_BUTTONS 0x73
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60 #define DIAL_SET_ALL_LEDS 0x4b
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61 #define DIAL_CLEAR_ALL_LEDS 0x4c
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63 /* dial/button box replies and events */
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64 #define DIAL_INITIALIZED 0x20
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65 #define DIAL_BASE 0x30
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66 #define DIAL_DELTA_BASE 0x40
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67 #define DIAL_PRESS_BASE 0xc0
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68 #define DIAL_RELEASE_BASE 0xe0
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70 /* macros to determine reply type */
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71 #define IS_DIAL_EVENT(ch) (((ch)>=DIAL_BASE)&&((ch)<DIAL_BASE+DIAL_NUM_VALUATORS))
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72 #define IS_KEY_PRESS(ch) (((ch)>=DIAL_PRESS_BASE)&&((ch)<DIAL_PRESS_BASE+DIAL_NUM_BUTTONS))
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73 #define IS_KEY_RELEASE(ch) (((ch)>=DIAL_RELEASE_BASE)&&((ch)<DIAL_RELEASE_BASE+DIAL_NUM_BUTTONS))
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74 #define IS_INIT_EVENT(ch) ((ch)==DIAL_INITIALIZED)
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76 /*****************************************************************/
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78 extern SERIALPORT *serial_open ( const char *device );
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79 extern void serial_close ( SERIALPORT *port );
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80 extern int serial_getchar ( SERIALPORT *port );
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81 extern int serial_putchar ( SERIALPORT *port, unsigned char ch );
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82 extern void serial_flush ( SERIALPORT *port );
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84 extern void fgPlatformRegisterDialDevice ( const char *dial_device );
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85 static void send_dial_event(int dial, int value);
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86 static void poll_dials(int id);
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88 /* local variables */
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89 static SERIALPORT *dialbox_port=NULL;
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91 /*****************************************************************/
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94 * Implementation for glutDeviceGet(GLUT_HAS_DIAL_AND_BUTTON_BOX)
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96 int fgInputDeviceDetect( void )
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98 fgInitialiseInputDevices ();
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100 if ( !dialbox_port )
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103 if ( !fgState.InputDevsInitialised )
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110 * Try initializing the input device(s)
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112 void fgInitialiseInputDevices ( void )
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114 if( !fgState.InputDevsInitialised )
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116 const char *dial_device=NULL;
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117 dial_device = getenv ( "GLUT_DIALS_SERIAL" );
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118 fgPlatformRegisterDialDevice ( dial_device );
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120 if ( !dial_device ) return;
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121 if ( !( dialbox_port = serial_open ( dial_device ) ) ) return;
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122 serial_putchar(dialbox_port,DIAL_INITIALIZE);
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123 glutTimerFunc ( 10, poll_dials, 0 );
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124 fgState.InputDevsInitialised = GL_TRUE;
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131 void fgInputDeviceClose( void )
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133 if ( fgState.InputDevsInitialised )
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135 serial_close ( dialbox_port );
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136 dialbox_port = NULL;
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137 fgState.InputDevsInitialised = GL_FALSE;
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141 /********************************************************************/
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143 /* Check all windows for dialbox callbacks */
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144 static void fghcbEnumDialCallbacks ( SFG_Window *window, SFG_Enumerator *enumerator )
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146 /* Built-in to INVOKE_WCB(): if window->Callbacks[CB_Dials] */
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147 INVOKE_WCB ( *window,Dials, ( ((int*)enumerator->data)[0], ((int*)enumerator->data)[1]) );
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148 fgEnumSubWindows ( window, fghcbEnumDialCallbacks, enumerator );
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151 static void send_dial_event ( int num, int value )
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153 SFG_Enumerator enumerator;
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157 enumerator.found = GL_FALSE;
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158 enumerator.data = data;
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159 fgEnumWindows ( fghcbEnumDialCallbacks, &enumerator );
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162 /********************************************************************/
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163 static void poll_dials ( int id )
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166 static int dial_state = DIAL_NEW;
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167 static int dial_which;
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168 static int dial_value;
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169 static int dials[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
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171 if ( !dialbox_port ) return;
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173 while ( (data=serial_getchar(dialbox_port)) != EOF )
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175 if ( ( dial_state > DIAL_WHICH_DEVICE ) || IS_DIAL_EVENT ( data ) )
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177 switch ( dial_state )
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179 case DIAL_WHICH_DEVICE:
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180 dial_which = data - DIAL_BASE;
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183 case DIAL_VALUE_HIGH:
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184 dial_value = ( data << 8 );
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187 case DIAL_VALUE_LOW:
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188 dial_value |= data;
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189 if ( dial_value & 0x8000 ) dial_value -= 0x10000;
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190 dials[dial_which] = dial_value;
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191 send_dial_event ( dial_which + 1, dial_value * 360 / 256 );
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192 dial_state = DIAL_WHICH_DEVICE;
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195 /* error: Impossible state value! */
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199 else if ( data == DIAL_INITIALIZED )
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201 fgState.InputDevsInitialised = GL_TRUE;
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202 dial_state = DIAL_WHICH_DEVICE;
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203 serial_putchar(dialbox_port,DIAL_SET_AUTO_DIALS);
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204 serial_putchar(dialbox_port,0xff);
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205 serial_putchar(dialbox_port,0xff);
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207 else /* Unknown data; try flushing. */
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208 serial_flush(dialbox_port);
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211 glutTimerFunc ( 2, poll_dials, 0 );
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