Mercurial > sdl-ios-xcode
annotate test/testjoystick.c @ 4216:5b99971a27b4 SDL-1.2
Fixed bug #698
Hans de Goede 2009-02-13 01:10:52 PST
Since the new "glitch free" version of pulseaudio (used in Fedora 10 amongst
others), the sound of SDL using apps (like a simple playmus call) has been
crackling.
While looking in to fixing this I noticed that the current pulseaudio code in
SDL uses pa_simple. However pa_simple uses a thread to pump pulseaudio events
and ipc, given that SDL already has its own thread for audio handling this is
clearly suboptimal, leading to unnecessary context switching IPC, etc. Also
pa_simple does not allow one to implement the WaitAudio() callback for SDL
audiodrivers properly.
Given that my work is mostly a rewrite (although some original pieces remain)
I'm attaching the new .c and .h file, as that is easier to review then the huge
diff.
Let me know if you also want the diff.
This new version has the following features:
-no longer use an additional thread next to the SDL sound thread
-do not crackle with glitch free audio
-when used with a newer pulse, which does glitch free audio, the total latency
is
the same as with the alsa driver
-proper WaitAudio() implementation, saving another mixlen worth of latency
-adds a WaitDone() implementation
This patch has been written in consultancy with Lennart Poetering (the
pulseaudio author) and has been reviewed by him for correct use of the pa API.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 21 Sep 2009 09:27:08 +0000 |
| parents | 0dd0ca51d941 |
| children |
| rev | line source |
|---|---|
| 0 | 1 |
| 2 /* Simple program to test the SDL joystick routines */ | |
| 3 | |
| 4 #include <stdio.h> | |
| 5 #include <stdlib.h> | |
| 6 #include <string.h> | |
| 7 | |
| 8 #include "SDL.h" | |
| 9 | |
| 10 #define SCREEN_WIDTH 640 | |
| 11 #define SCREEN_HEIGHT 480 | |
| 12 | |
| 13 void WatchJoystick(SDL_Joystick *joystick) | |
| 14 { | |
| 15 SDL_Surface *screen; | |
| 16 const char *name; | |
| 17 int i, done; | |
| 18 SDL_Event event; | |
| 19 int x, y, draw; | |
|
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20 SDL_Rect axis_area[2]; |
| 0 | 21 |
| 22 /* Set a video mode to display joystick axis position */ | |
| 23 screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, 16, 0); | |
| 24 if ( screen == NULL ) { | |
| 25 fprintf(stderr, "Couldn't set video mode: %s\n",SDL_GetError()); | |
| 26 return; | |
| 27 } | |
| 28 | |
| 29 /* Print info about the joystick we are watching */ | |
| 30 name = SDL_JoystickName(SDL_JoystickIndex(joystick)); | |
| 31 printf("Watching joystick %d: (%s)\n", SDL_JoystickIndex(joystick), | |
| 32 name ? name : "Unknown Joystick"); | |
| 33 printf("Joystick has %d axes, %d hats, %d balls, and %d buttons\n", | |
| 34 SDL_JoystickNumAxes(joystick), SDL_JoystickNumHats(joystick), | |
| 35 SDL_JoystickNumBalls(joystick),SDL_JoystickNumButtons(joystick)); | |
| 36 | |
| 37 /* Initialize drawing rectangles */ | |
| 38 memset(axis_area, 0, (sizeof axis_area)); | |
| 39 draw = 0; | |
| 40 | |
| 41 /* Loop, getting joystick events! */ | |
| 42 done = 0; | |
| 43 while ( ! done ) { | |
| 44 while ( SDL_PollEvent(&event) ) { | |
| 45 switch (event.type) { | |
| 46 case SDL_JOYAXISMOTION: | |
| 47 printf("Joystick %d axis %d value: %d\n", | |
| 48 event.jaxis.which, | |
| 49 event.jaxis.axis, | |
| 50 event.jaxis.value); | |
| 51 break; | |
| 52 case SDL_JOYHATMOTION: | |
| 53 printf("Joystick %d hat %d value:", | |
| 54 event.jhat.which, | |
| 55 event.jhat.hat); | |
| 56 if ( event.jhat.value == SDL_HAT_CENTERED ) | |
| 57 printf(" centered"); | |
| 58 if ( event.jhat.value & SDL_HAT_UP ) | |
| 59 printf(" up"); | |
| 60 if ( event.jhat.value & SDL_HAT_RIGHT ) | |
| 61 printf(" right"); | |
| 62 if ( event.jhat.value & SDL_HAT_DOWN ) | |
| 63 printf(" down"); | |
| 64 if ( event.jhat.value & SDL_HAT_LEFT ) | |
| 65 printf(" left"); | |
| 66 printf("\n"); | |
| 67 break; | |
| 68 case SDL_JOYBALLMOTION: | |
| 69 printf("Joystick %d ball %d delta: (%d,%d)\n", | |
| 70 event.jball.which, | |
| 71 event.jball.ball, | |
| 72 event.jball.xrel, | |
| 73 event.jball.yrel); | |
| 74 break; | |
| 75 case SDL_JOYBUTTONDOWN: | |
| 76 printf("Joystick %d button %d down\n", | |
| 77 event.jbutton.which, | |
| 78 event.jbutton.button); | |
| 79 break; | |
| 80 case SDL_JOYBUTTONUP: | |
| 81 printf("Joystick %d button %d up\n", | |
| 82 event.jbutton.which, | |
| 83 event.jbutton.button); | |
| 84 break; | |
| 85 case SDL_KEYDOWN: | |
| 86 if ( event.key.keysym.sym != SDLK_ESCAPE ) { | |
| 87 break; | |
| 88 } | |
| 89 /* Fall through to signal quit */ | |
| 90 case SDL_QUIT: | |
| 91 done = 1; | |
| 92 break; | |
| 93 default: | |
| 94 break; | |
| 95 } | |
| 96 } | |
| 97 /* Update visual joystick state */ | |
| 98 for ( i=0; i<SDL_JoystickNumButtons(joystick); ++i ) { | |
| 99 SDL_Rect area; | |
| 100 | |
| 101 area.x = i*34; | |
| 102 area.y = SCREEN_HEIGHT-34; | |
| 103 area.w = 32; | |
| 104 area.h = 32; | |
| 105 if (SDL_JoystickGetButton(joystick, i) == SDL_PRESSED) { | |
| 106 SDL_FillRect(screen, &area, 0xFFFF); | |
| 107 } else { | |
| 108 SDL_FillRect(screen, &area, 0x0000); | |
| 109 } | |
| 110 SDL_UpdateRects(screen, 1, &area); | |
| 111 } | |
| 112 | |
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113 /* Erase previous axes */ |
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114 SDL_FillRect(screen, &axis_area[draw], 0x0000); |
| 0 | 115 |
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116 /* Draw the X/Y axis */ |
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117 draw = !draw; |
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118 x = (((int)SDL_JoystickGetAxis(joystick, 0))+32768); |
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119 x *= SCREEN_WIDTH; |
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120 x /= 65535; |
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121 if ( x < 0 ) { |
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122 x = 0; |
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123 } else |
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124 if ( x > (SCREEN_WIDTH-16) ) { |
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125 x = SCREEN_WIDTH-16; |
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126 } |
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127 y = (((int)SDL_JoystickGetAxis(joystick, 1))+32768); |
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128 y *= SCREEN_HEIGHT; |
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129 y /= 65535; |
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130 if ( y < 0 ) { |
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131 y = 0; |
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132 } else |
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133 if ( y > (SCREEN_HEIGHT-16) ) { |
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134 y = SCREEN_HEIGHT-16; |
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135 } |
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136 axis_area[draw].x = (Sint16)x; |
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137 axis_area[draw].y = (Sint16)y; |
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138 axis_area[draw].w = 16; |
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139 axis_area[draw].h = 16; |
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140 SDL_FillRect(screen, &axis_area[draw], 0xFFFF); |
| 1854 | 141 |
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142 SDL_UpdateRects(screen, 2, axis_area); |
| 0 | 143 } |
| 144 } | |
| 145 | |
| 146 int main(int argc, char *argv[]) | |
| 147 { | |
| 148 const char *name; | |
| 149 int i; | |
| 150 SDL_Joystick *joystick; | |
| 151 | |
| 152 /* Initialize SDL (Note: video is required to start event loop) */ | |
| 153 if ( SDL_Init(SDL_INIT_VIDEO|SDL_INIT_JOYSTICK) < 0 ) { | |
| 154 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError()); | |
| 155 exit(1); | |
| 156 } | |
| 157 | |
| 158 /* Print information about the joysticks */ | |
| 159 printf("There are %d joysticks attached\n", SDL_NumJoysticks()); | |
| 160 for ( i=0; i<SDL_NumJoysticks(); ++i ) { | |
| 161 name = SDL_JoystickName(i); | |
| 162 printf("Joystick %d: %s\n",i,name ? name : "Unknown Joystick"); | |
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163 joystick = SDL_JoystickOpen(i); |
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164 if (joystick == NULL) { |
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165 fprintf(stderr, "SDL_JoystickOpen(%d) failed: %s\n", i, SDL_GetError()); |
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166 } else { |
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0dd0ca51d941
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Ryan C. Gordon <icculus@icculus.org>
parents:
4071
diff
changeset
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167 printf(" axes: %d\n", SDL_JoystickNumAxes(joystick)); |
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parents:
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168 printf(" balls: %d\n", SDL_JoystickNumBalls(joystick)); |
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parents:
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169 printf(" hats: %d\n", SDL_JoystickNumHats(joystick)); |
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parents:
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170 printf(" buttons: %d\n", SDL_JoystickNumButtons(joystick)); |
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parents:
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171 SDL_JoystickClose(joystick); |
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172 } |
| 0 | 173 } |
| 174 | |
| 175 if ( argv[1] ) { | |
| 176 joystick = SDL_JoystickOpen(atoi(argv[1])); | |
| 177 if ( joystick == NULL ) { | |
| 178 printf("Couldn't open joystick %d: %s\n", atoi(argv[1]), | |
| 179 SDL_GetError()); | |
| 180 } else { | |
| 181 WatchJoystick(joystick); | |
| 182 SDL_JoystickClose(joystick); | |
| 183 } | |
| 184 } | |
| 185 SDL_QuitSubSystem(SDL_INIT_VIDEO|SDL_INIT_JOYSTICK); | |
| 186 | |
| 187 return(0); | |
| 188 } |