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annotate src/events/SDL_events.c @ 1724:6c63fc2bd986 SDL-1.3

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Proof of concept done - Win32 GDI implementation mostly complete.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 06 Jul 2006 07:17:11 +0000
parents 5daa04d862f1
children 875c3cf1a12c
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* General event handling code for SDL */
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25
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26 #include "SDL.h"
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27 #include "SDL_syswm.h"
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28 #include "SDL_sysevents.h"
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29 #include "SDL_events_c.h"
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30 #include "../timer/SDL_timer_c.h"
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31 #if !SDL_JOYSTICK_DISABLED
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32 #include "../joystick/SDL_joystick_c.h"
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33 #endif
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34
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35 /* Public data -- the event filter */
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36 SDL_EventFilter SDL_EventOK = NULL;
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37 void *SDL_EventOKParam;
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38 Uint8 SDL_ProcessEvents[SDL_NUMEVENTS];
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39 static Uint32 SDL_eventstate = 0;
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40
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41 /* Private data -- event queue */
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42 #define MAXEVENTS 128
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43 static struct
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44 {
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45 SDL_mutex *lock;
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46 int active;
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47 int head;
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48 int tail;
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49 SDL_Event event[MAXEVENTS];
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50 int wmmsg_next;
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51 struct SDL_SysWMmsg wmmsg[MAXEVENTS];
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52 } SDL_EventQ;
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53
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54 /* Private data -- event locking structure */
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55 static struct
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56 {
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57 SDL_mutex *lock;
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58 int safe;
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59 } SDL_EventLock;
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60
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61 /* Thread functions */
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62 static SDL_Thread *SDL_EventThread = NULL; /* Thread handle */
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63 static Uint32 event_thread; /* The event thread id */
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64
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65 void
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66 SDL_Lock_EventThread(void)
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67 {
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68 if (SDL_EventThread && (SDL_ThreadID() != event_thread)) {
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69 /* Grab lock and spin until we're sure event thread stopped */
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70 SDL_mutexP(SDL_EventLock.lock);
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71 while (!SDL_EventLock.safe) {
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72 SDL_Delay(1);
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73 }
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74 }
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75 }
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76 void
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77 SDL_Unlock_EventThread(void)
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78 {
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79 if (SDL_EventThread && (SDL_ThreadID() != event_thread)) {
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80 SDL_mutexV(SDL_EventLock.lock);
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81 }
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82 }
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83
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84 #ifdef __OS2__
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85 /*
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86 * We'll increase the priority of GobbleEvents thread, so it will process
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87 * events in time for sure! For this, we need the DosSetPriority() API
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88 * from the os2.h include file.
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89 */
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90 #define INCL_DOSPROCESS
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91 #include <os2.h>
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92 #include <time.h>
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93 #endif
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94
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95 static int SDLCALL
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96 SDL_GobbleEvents(void *unused)
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97 {
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98 event_thread = SDL_ThreadID();
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99
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100 #ifdef __OS2__
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101 #ifdef USE_DOSSETPRIORITY
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102 /* Increase thread priority, so it will process events in time for sure! */
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103 DosSetPriority(PRTYS_THREAD, PRTYC_REGULAR, +16, 0);
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104 #endif
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105 #endif
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106
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107 while (SDL_EventQ.active) {
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108 SDL_VideoDevice *_this = SDL_GetVideoDevice();
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109
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110 /* Get events from the video subsystem */
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111 if (_this) {
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112 _this->PumpEvents(_this);
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113 }
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114
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115 /* Queue pending key-repeat events */
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116 SDL_CheckKeyRepeat();
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117
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118 #if !SDL_JOYSTICK_DISABLED
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119 /* Check for joystick state change */
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120 if (SDL_numjoysticks && (SDL_eventstate & SDL_JOYEVENTMASK)) {
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121 SDL_JoystickUpdate();
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122 }
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123 #endif
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124
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125 /* Give up the CPU for the rest of our timeslice */
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126 SDL_EventLock.safe = 1;
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127 if (SDL_timer_running) {
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128 SDL_ThreadedTimerCheck();
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129 }
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130 SDL_Delay(1);
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131
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132 /* Check for event locking.
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133 On the P of the lock mutex, if the lock is held, this thread
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134 will wait until the lock is released before continuing. The
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135 safe flag will be set, meaning that the other thread can go
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136 about it's business. The safe flag is reset before the V,
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137 so as soon as the mutex is free, other threads can see that
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138 it's not safe to interfere with the event thread.
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139 */
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140 SDL_mutexP(SDL_EventLock.lock);
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141 SDL_EventLock.safe = 0;
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142 SDL_mutexV(SDL_EventLock.lock);
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143 }
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144 SDL_SetTimerThreaded(0);
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145 event_thread = 0;
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146 return (0);
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147 }
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148
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149 static int
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150 SDL_StartEventThread(Uint32 flags)
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151 {
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152 /* Reset everything to zero */
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153 SDL_EventThread = NULL;
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154 SDL_memset(&SDL_EventLock, 0, sizeof(SDL_EventLock));
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155
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156 /* Create the lock and set ourselves active */
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157 #if !SDL_THREADS_DISABLED
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158 SDL_EventQ.lock = SDL_CreateMutex();
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159 if (SDL_EventQ.lock == NULL) {
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160 #ifdef __MACOS__ /* MacOS classic you can't multithread, so no lock needed */
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161 ;
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162 #else
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163 return (-1);
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164 #endif
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165 }
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166 #endif /* !SDL_THREADS_DISABLED */
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167 SDL_EventQ.active = 1;
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168
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169 if ((flags & SDL_INIT_EVENTTHREAD) == SDL_INIT_EVENTTHREAD) {
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170 SDL_EventLock.lock = SDL_CreateMutex();
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171 if (SDL_EventLock.lock == NULL) {
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172 return (-1);
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173 }
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174 SDL_EventLock.safe = 0;
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175
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176 /* The event thread will handle timers too */
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177 SDL_SetTimerThreaded(2);
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178 #if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC)
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179 #undef SDL_CreateThread
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180 SDL_EventThread =
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181 SDL_CreateThread(SDL_GobbleEvents, NULL, NULL, NULL);
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182 #else
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183 SDL_EventThread = SDL_CreateThread(SDL_GobbleEvents, NULL);
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184 #endif
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185 if (SDL_EventThread == NULL) {
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186 return (-1);
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187 }
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188 } else {
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189 event_thread = 0;
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190 }
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191 return (0);
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192 }
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193
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194 static void
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195 SDL_StopEventThread(void)
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196 {
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197 SDL_EventQ.active = 0;
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198 if (SDL_EventThread) {
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199 SDL_WaitThread(SDL_EventThread, NULL);
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200 SDL_EventThread = NULL;
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201 SDL_DestroyMutex(SDL_EventLock.lock);
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202 }
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203 #ifndef IPOD
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204 SDL_DestroyMutex(SDL_EventQ.lock);
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205 #endif
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206 }
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207
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208 Uint32
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209 SDL_EventThreadID(void)
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210 {
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211 return (event_thread);
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212 }
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213
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214 /* Public functions */
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215
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216 void
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217 SDL_StopEventLoop(void)
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218 {
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219 /* Halt the event thread, if running */
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220 SDL_StopEventThread();
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221
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222 /* Shutdown event handlers */
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223 SDL_KeyboardQuit();
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224 SDL_MouseQuit();
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225 SDL_QuitQuit();
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226
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227 /* Clean out EventQ */
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228 SDL_EventQ.head = 0;
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229 SDL_EventQ.tail = 0;
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230 SDL_EventQ.wmmsg_next = 0;
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231 }
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232
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233 /* This function (and associated calls) may be called more than once */
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234 int
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235 SDL_StartEventLoop(Uint32 flags)
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236 {
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237 int retcode;
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238
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239 /* Clean out the event queue */
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240 SDL_EventThread = NULL;
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241 SDL_EventQ.lock = NULL;
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242 SDL_StopEventLoop();
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243
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244 /* No filter to start with, process most event types */
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245 SDL_EventOK = NULL;
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246 SDL_memset(SDL_ProcessEvents, SDL_ENABLE, sizeof(SDL_ProcessEvents));
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247 SDL_eventstate = ~0;
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248 /* It's not save to call SDL_EventState() yet */
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249 SDL_eventstate &= ~(0x00000001 << SDL_SYSWMEVENT);
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250 SDL_ProcessEvents[SDL_SYSWMEVENT] = SDL_IGNORE;
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251
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252 /* Initialize event handlers */
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253 retcode = 0;
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254 retcode += SDL_KeyboardInit();
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255 retcode += SDL_MouseInit();
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256 retcode += SDL_QuitInit();
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257 if (retcode < 0) {
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258 /* We don't expect them to fail, but... */
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259 return (-1);
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260 }
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261
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262 /* Create the lock and event thread */
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263 if (SDL_StartEventThread(flags) < 0) {
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264 SDL_StopEventLoop();
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265 return (-1);
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266 }
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267 return (0);
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268 }
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269
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270
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271 /* Add an event to the event queue -- called with the queue locked */
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272 static int
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273 SDL_AddEvent(SDL_Event * event)
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274 {
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275 int tail, added;
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276
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277 tail = (SDL_EventQ.tail + 1) % MAXEVENTS;
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278 if (tail == SDL_EventQ.head) {
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279 /* Overflow, drop event */
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280 added = 0;
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281 } else {
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282 SDL_EventQ.event[SDL_EventQ.tail] = *event;
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283 if (event->type == SDL_SYSWMEVENT) {
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284 /* Note that it's possible to lose an event */
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285 int next = SDL_EventQ.wmmsg_next;
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286 SDL_EventQ.wmmsg[next] = *event->syswm.msg;
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287 SDL_EventQ.event[SDL_EventQ.tail].syswm.msg =
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288 &SDL_EventQ.wmmsg[next];
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289 SDL_EventQ.wmmsg_next = (next + 1) % MAXEVENTS;
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290 }
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291 SDL_EventQ.tail = tail;
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292 added = 1;
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293 }
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294 return (added);
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295 }
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296
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297 /* Cut an event, and return the next valid spot, or the tail */
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298 /* -- called with the queue locked */
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299 static int
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300 SDL_CutEvent(int spot)
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301 {
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302 if (spot == SDL_EventQ.head) {
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303 SDL_EventQ.head = (SDL_EventQ.head + 1) % MAXEVENTS;
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304 return (SDL_EventQ.head);
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305 } else if ((spot + 1) % MAXEVENTS == SDL_EventQ.tail) {
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306 SDL_EventQ.tail = spot;
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307 return (SDL_EventQ.tail);
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308 } else
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309 /* We cut the middle -- shift everything over */
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310 {
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311 int here, next;
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312
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313 /* This can probably be optimized with SDL_memcpy() -- careful! */
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314 if (--SDL_EventQ.tail < 0) {
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315 SDL_EventQ.tail = MAXEVENTS - 1;
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316 }
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317 for (here = spot; here != SDL_EventQ.tail; here = next) {
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318 next = (here + 1) % MAXEVENTS;
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319 SDL_EventQ.event[here] = SDL_EventQ.event[next];
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320 }
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321 return (spot);
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322 }
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323 /* NOTREACHED */
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324 }
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325
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326 /* Lock the event queue, take a peep at it, and unlock it */
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327 int
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328 SDL_PeepEvents(SDL_Event * events, int numevents, SDL_eventaction action,
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329 Uint32 mask)
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330 {
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331 int i, used;
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332
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333 /* Don't look after we've quit */
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334 if (!SDL_EventQ.active) {
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335 return (-1);
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336 }
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337 /* Lock the event queue */
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338 used = 0;
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339 if (SDL_mutexP(SDL_EventQ.lock) == 0) {
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340 if (action == SDL_ADDEVENT) {
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341 for (i = 0; i < numevents; ++i) {
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342 used += SDL_AddEvent(&events[i]);
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343 }
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344 } else {
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345 SDL_Event tmpevent;
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346 int spot;
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347
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348 /* If 'events' is NULL, just see if they exist */
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349 if (events == NULL) {
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350 action = SDL_PEEKEVENT;
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351 numevents = 1;
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352 events = &tmpevent;
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353 }
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354 spot = SDL_EventQ.head;
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355 while ((used < numevents) && (spot != SDL_EventQ.tail)) {
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356 if (mask & SDL_EVENTMASK(SDL_EventQ.event[spot].type)) {
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357 events[used++] = SDL_EventQ.event[spot];
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358 if (action == SDL_GETEVENT) {
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359 spot = SDL_CutEvent(spot);
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360 } else {
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361 spot = (spot + 1) % MAXEVENTS;
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362 }
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363 } else {
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364 spot = (spot + 1) % MAXEVENTS;
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365 }
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366 }
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367 }
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368 SDL_mutexV(SDL_EventQ.lock);
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369 } else {
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370 SDL_SetError("Couldn't lock event queue");
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371 used = -1;
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372 }
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373 return (used);
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374 }
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375
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376 SDL_bool
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377 SDL_HasEvent(Uint32 mask)
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378 {
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379 return (SDL_PeepEvents(NULL, 0, SDL_PEEKEVENT, mask) > 0);
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380 }
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381
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382 /* Run the system dependent event loops */
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383 void
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384 SDL_PumpEvents(void)
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385 {
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386 if (!SDL_EventThread) {
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387 SDL_VideoDevice *_this = SDL_GetVideoDevice();
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388
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389 /* Get events from the video subsystem */
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390 if (_this) {
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391 _this->PumpEvents(_this);
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392 }
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393
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diff changeset
394 /* Queue pending key-repeat events */
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diff changeset
395 SDL_CheckKeyRepeat();
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diff changeset
396
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diff changeset
397 #if !SDL_JOYSTICK_DISABLED
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diff changeset
398 /* Check for joystick state change */
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diff changeset
399 if (SDL_numjoysticks && (SDL_eventstate & SDL_JOYEVENTMASK)) {
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400 SDL_JoystickUpdate();
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diff changeset
401 }
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diff changeset
402 #endif
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403 }
0
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diff changeset
404 }
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parents:
diff changeset
405
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diff changeset
406 /* Public functions */
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diff changeset
407
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diff changeset
408 int
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diff changeset
409 SDL_PollEvent(SDL_Event * event)
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410 {
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diff changeset
411 SDL_PumpEvents();
0
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diff changeset
412
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413 /* We can't return -1, just return 0 (no event) on error */
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414 if (SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS) <= 0)
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415 return 0;
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416 return 1;
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417 }
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418
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419 int
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420 SDL_WaitEvent(SDL_Event * event)
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421 {
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diff changeset
422 while (1) {
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423 SDL_PumpEvents();
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424 switch (SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_ALLEVENTS)) {
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425 case -1:
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426 return 0;
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diff changeset
427 case 1:
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428 return 1;
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429 case 0:
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430 SDL_Delay(10);
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431 }
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432 }
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433 }
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diff changeset
434
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435 int
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436 SDL_PushEvent(SDL_Event * event)
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diff changeset
437 {
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438 if (SDL_PeepEvents(event, 1, SDL_ADDEVENT, 0) <= 0)
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439 return -1;
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diff changeset
440 return 0;
0
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441 }
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diff changeset
442
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diff changeset
443 void
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444 SDL_SetEventFilter(SDL_EventFilter filter, void *userdata)
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diff changeset
445 {
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446 SDL_Event bitbucket;
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diff changeset
447
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diff changeset
448 /* Set filter and discard pending events */
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449 SDL_EventOK = filter;
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450 SDL_EventOKParam = userdata;
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451 while (SDL_PollEvent(&bitbucket) > 0);
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452 }
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453
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diff changeset
454 SDL_EventFilter
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diff changeset
455 SDL_GetEventFilter(void **userdata)
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diff changeset
456 {
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diff changeset
457 if (userdata) {
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diff changeset
458 *userdata = SDL_EventOKParam;
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diff changeset
459 }
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diff changeset
460 return (SDL_EventOK);
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diff changeset
461 }
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diff changeset
462
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diff changeset
463 void
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diff changeset
464 SDL_FilterEvents(SDL_EventFilter filter, void *userdata)
0
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diff changeset
465 {
1722
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diff changeset
466 if (SDL_mutexP(SDL_EventQ.lock) == 0) {
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467 int spot;
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468
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diff changeset
469 spot = SDL_EventQ.head;
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diff changeset
470 while (spot != SDL_EventQ.tail) {
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diff changeset
471 if (filter(userdata, &SDL_EventQ.event[spot])) {
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diff changeset
472 spot = (spot + 1) % MAXEVENTS;
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diff changeset
473 } else {
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diff changeset
474 spot = SDL_CutEvent(spot);
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diff changeset
475 }
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diff changeset
476 }
5daa04d862f1 Added a userdata parameter for event filters.
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diff changeset
477 }
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diff changeset
478 SDL_mutexV(SDL_EventQ.lock);
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479 }
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diff changeset
480
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diff changeset
481 Uint8
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482 SDL_EventState(Uint8 type, int state)
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diff changeset
483 {
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diff changeset
484 SDL_Event bitbucket;
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diff changeset
485 Uint8 current_state;
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diff changeset
486
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487 /* If SDL_ALLEVENTS was specified... */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
488 if (type == 0xFF) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
489 current_state = SDL_IGNORE;
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diff changeset
490 for (type = 0; type < SDL_NUMEVENTS; ++type) {
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diff changeset
491 if (SDL_ProcessEvents[type] != SDL_IGNORE) {
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diff changeset
492 current_state = SDL_ENABLE;
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diff changeset
493 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
494 SDL_ProcessEvents[type] = state;
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diff changeset
495 if (state == SDL_ENABLE) {
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diff changeset
496 SDL_eventstate |= (0x00000001 << (type));
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diff changeset
497 } else {
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diff changeset
498 SDL_eventstate &= ~(0x00000001 << (type));
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diff changeset
499 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
500 }
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diff changeset
501 while (SDL_PollEvent(&bitbucket) > 0);
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diff changeset
502 return (current_state);
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diff changeset
503 }
0
74212992fb08 Initial revision
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diff changeset
504
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diff changeset
505 /* Just set the state for one event type */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
506 current_state = SDL_ProcessEvents[type];
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diff changeset
507 switch (state) {
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diff changeset
508 case SDL_IGNORE:
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diff changeset
509 case SDL_ENABLE:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
510 /* Set state and discard pending events */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
511 SDL_ProcessEvents[type] = state;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
512 if (state == SDL_ENABLE) {
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diff changeset
513 SDL_eventstate |= (0x00000001 << (type));
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diff changeset
514 } else {
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diff changeset
515 SDL_eventstate &= ~(0x00000001 << (type));
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diff changeset
516 }
1668
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diff changeset
517 while (SDL_PollEvent(&bitbucket) > 0);
1662
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diff changeset
518 break;
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diff changeset
519 default:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
520 /* Querying state? */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
521 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
522 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
523 return (current_state);
0
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parents:
diff changeset
524 }
74212992fb08 Initial revision
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diff changeset
525
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parents:
diff changeset
526 /* This is a generic event handler.
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527 */
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528 int
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529 SDL_SendSysWMEvent(SDL_SysWMmsg * message)
0
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530 {
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531 int posted;
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532
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533 posted = 0;
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534 if (SDL_ProcessEvents[SDL_SYSWMEVENT] == SDL_ENABLE) {
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535 SDL_Event event;
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536 SDL_memset(&event, 0, sizeof(event));
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537 event.type = SDL_SYSWMEVENT;
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538 event.syswm.msg = message;
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539 if ((SDL_EventOK == NULL)
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540 || (*SDL_EventOK) (SDL_EventOKParam, &event)) {
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541 posted = 1;
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542 SDL_PushEvent(&event);
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543 }
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544 }
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545 /* Update internal event state */
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546 return (posted);
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547 }
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548
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549 /* vi: set ts=4 sw=4 expandtab: */