Mercurial > sdl-ios-xcode
annotate src/joystick/iphoneos/SDLUIAccelerationDelegate.m @ 5172:ededa1ccf91c
Switched the SDL 1.2 compatibility to use the window surface, so it's fast even when there's no hardware acceleration available.
This means that the YUV overlay now uses software, but that's okay since fast YUV code should be using the textures now anyway.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Thu, 03 Feb 2011 21:13:55 -0800 |
parents | 99210400e8b9 |
children | b530ef003506 |
rev | line source |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
2859 | 3 Copyright (C) 1997-2009 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 |
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23 #import "SDLUIAccelerationDelegate.h" |
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24 /* needed for SDL_IPHONE_MAX_GFORCE macro */ |
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25 #import "../../../include/SDL_config_iphoneos.h" |
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26 |
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27 static SDLUIAccelerationDelegate *sharedDelegate=nil; |
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28 |
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29 @implementation SDLUIAccelerationDelegate |
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30 |
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31 /* |
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32 Returns a shared instance of the SDLUIAccelerationDelegate, creating the shared delegate if it doesn't exist yet. |
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33 */ |
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34 +(SDLUIAccelerationDelegate *)sharedDelegate { |
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35 if (sharedDelegate == nil) { |
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36 sharedDelegate = [[SDLUIAccelerationDelegate alloc] init]; |
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37 } |
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38 return sharedDelegate; |
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39 } |
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40 /* |
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41 UIAccelerometerDelegate delegate method. Invoked by the UIAccelerometer instance when it has new data for us. |
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42 We just take the data and mark that we have new data available so that the joystick system will pump it to the |
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43 events system when SDL_SYS_JoystickUpdate is called. |
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44 */ |
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45 -(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration { |
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46 |
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47 x = acceleration.x; |
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48 y = acceleration.y; |
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49 z = acceleration.z; |
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50 |
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51 hasNewData = YES; |
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52 } |
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53 /* |
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54 getLastOrientation -- put last obtained accelerometer data into Sint16 array |
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55 |
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56 Called from the joystick system when it needs the accelerometer data. |
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57 Function grabs the last data sent to the accelerometer and converts it |
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58 from floating point to Sint16, which is what the joystick system expects. |
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59 |
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60 To do the conversion, the data is first clamped onto the interval |
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61 [-SDL_IPHONE_MAX_G_FORCE, SDL_IPHONE_MAX_G_FORCE], then the data is multiplied |
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62 by MAX_SINT16 so that it is mapped to the full range of an Sint16. |
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63 |
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64 You can customize the clamped range of this function by modifying the |
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65 SDL_IPHONE_MAX_GFORCE macro in SDL_config_iphoneos.h. |
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66 |
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67 Once converted to Sint16, the accelerometer data no longer has coherent units. |
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68 You can convert the data back to units of g-force by multiplying it |
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69 in your application's code by SDL_IPHONE_MAX_GFORCE / 0x7FFF. |
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70 */ |
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71 -(void)getLastOrientation:(Sint16 *)data { |
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72 |
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73 #define MAX_SINT16 0x7FFF |
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74 |
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75 /* clamp the data */ |
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76 if (x > SDL_IPHONE_MAX_GFORCE) x = SDL_IPHONE_MAX_GFORCE; |
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77 else if (x < -SDL_IPHONE_MAX_GFORCE) x = -SDL_IPHONE_MAX_GFORCE; |
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78 if (y > SDL_IPHONE_MAX_GFORCE) y = SDL_IPHONE_MAX_GFORCE; |
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79 else if (y < -SDL_IPHONE_MAX_GFORCE) y = -SDL_IPHONE_MAX_GFORCE; |
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80 if (z > SDL_IPHONE_MAX_GFORCE) z = SDL_IPHONE_MAX_GFORCE; |
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81 else if (z < -SDL_IPHONE_MAX_GFORCE) z = -SDL_IPHONE_MAX_GFORCE; |
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82 |
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83 /* pass in data mapped to range of SInt16 */ |
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84 data[0] = (x / SDL_IPHONE_MAX_GFORCE) * MAX_SINT16; |
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85 data[1] = (y / SDL_IPHONE_MAX_GFORCE) * MAX_SINT16; |
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86 data[2] = (z / SDL_IPHONE_MAX_GFORCE) * MAX_SINT16; |
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87 |
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88 } |
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89 |
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90 /* |
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91 Initialize SDLUIAccelerationDelegate. Since we don't have any data yet, |
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92 just set our last received data to zero, and indicate we don't have any; |
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93 */ |
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94 -(id)init { |
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95 self = [super init]; |
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96 x = y = z = 0.0; |
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97 hasNewData = NO; |
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98 return self; |
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99 } |
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100 |
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101 -(void)dealloc { |
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102 sharedDelegate = nil; |
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103 [self shutdown]; |
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104 [super dealloc]; |
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105 } |
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106 |
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107 /* |
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108 Lets our delegate start receiving accelerometer updates. |
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109 */ |
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110 -(void)startup { |
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111 [UIAccelerometer sharedAccelerometer].delegate = self; |
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112 isRunning = YES; |
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113 } |
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114 /* |
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115 Stops our delegate from receiving accelerometer updates. |
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116 */ |
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117 -(void)shutdown { |
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118 if ([UIAccelerometer sharedAccelerometer].delegate == self) { |
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119 [UIAccelerometer sharedAccelerometer].delegate = nil; |
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120 } |
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121 isRunning = NO; |
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122 } |
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123 /* |
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124 Our we currently receiving accelerometer updates? |
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125 */ |
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126 -(BOOL)isRunning { |
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127 return isRunning; |
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128 } |
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129 /* |
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130 Do we have any data that hasn't been pumped into SDL's event system? |
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131 */ |
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132 -(BOOL)hasNewData { |
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133 return hasNewData; |
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134 } |
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135 /* |
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136 When the joystick system grabs the new data, it sets this to NO. |
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137 */ |
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138 -(void)setHasNewData:(BOOL)value { |
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139 hasNewData = value; |
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140 } |
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141 |
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142 @end |