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annotate src/core/android/SDL_android.cpp @ 5104:42a7591530d5

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Since we're directly reading and writing 'active' from different threads, it needs to be flagged volatile.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 26 Jan 2011 19:20:16 -0800
parents ed1d54f1290a
children c66b2a778b7e
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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 #include "SDL_android.h"
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25
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26 extern "C" {
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27 #include "../../events/SDL_events_c.h"
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28 #include "../../video/android/SDL_androidkeyboard.h"
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29 #include "../../video/android/SDL_androidtouch.h"
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30 #include "../../video/android/SDL_androidvideo.h"
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31
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32 /* Impelemented in audio/android/SDL_androidaudio.c */
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33 extern void Android_RunAudioThread();
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34 } // C
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35
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36 /*******************************************************************************
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37 This file links the Java side of Android with libsdl
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38 *******************************************************************************/
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39 #include <jni.h>
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40 #include <android/log.h>
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41
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42
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43 /*******************************************************************************
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44 Globals
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45 *******************************************************************************/
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46 static JNIEnv* mEnv = NULL;
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47 static JNIEnv* mAudioEnv = NULL;
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48
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49 // Main activity
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50 static jclass mActivityClass;
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51
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52 // method signatures
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53 static jmethodID midCreateGLContext;
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54 static jmethodID midFlipBuffers;
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55 static jmethodID midAudioInit;
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56 static jmethodID midAudioWriteShortBuffer;
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57 static jmethodID midAudioWriteByteBuffer;
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58 static jmethodID midAudioQuit;
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59
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60 // Accelerometer data storage
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61 static float fLastAccelerometer[3];
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62
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63
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64 /*******************************************************************************
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65 Functions called by JNI
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66 *******************************************************************************/
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67
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68 // Library init
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69 extern "C" jint JNI_OnLoad(JavaVM* vm, void* reserved)
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70 {
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71 return JNI_VERSION_1_4;
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72 }
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73
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74 // Called before SDL_main() to initialize JNI bindings
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75 extern "C" void SDL_Android_Init(JNIEnv* env, jclass cls)
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76 {
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77 __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL_Android_Init()");
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78
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79 mEnv = env;
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80 mActivityClass = cls;
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81
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82 midCreateGLContext = mEnv->GetStaticMethodID(mActivityClass,
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83 "createGLContext","()V");
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84 midFlipBuffers = mEnv->GetStaticMethodID(mActivityClass,
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85 "flipBuffers","()V");
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86 midAudioInit = mEnv->GetStaticMethodID(mActivityClass,
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87 "audioInit", "(IZZI)Ljava/lang/Object;");
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88 midAudioWriteShortBuffer = mEnv->GetStaticMethodID(mActivityClass,
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89 "audioWriteShortBuffer", "([S)V");
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90 midAudioWriteByteBuffer = mEnv->GetStaticMethodID(mActivityClass,
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91 "audioWriteByteBuffer", "([B)V");
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92 midAudioQuit = mEnv->GetStaticMethodID(mActivityClass,
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93 "audioQuit", "()V");
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94
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95 if(!midCreateGLContext || !midFlipBuffers || !midAudioInit ||
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96 !midAudioWriteShortBuffer || !midAudioWriteByteBuffer || !midAudioQuit) {
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97 __android_log_print(ANDROID_LOG_WARN, "SDL", "SDL: Couldn't locate Java callbacks, check that they're named and typed correctly");
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98 }
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99 }
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100
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101 // Resize
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102 extern "C" void Java_org_libsdl_app_SDLActivity_onNativeResize(
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103 JNIEnv* env, jclass jcls,
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104 jint width, jint height, jint format)
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105 {
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106 Android_SetScreenResolution(width, height, format);
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107 }
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108
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109 // Keydown
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110 extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyDown(
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111 JNIEnv* env, jclass jcls, jint keycode)
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112 {
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113 Android_OnKeyDown(keycode);
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114 }
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115
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116 // Keyup
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117 extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyUp(
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118 JNIEnv* env, jclass jcls, jint keycode)
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119 {
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120 Android_OnKeyUp(keycode);
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121 }
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122
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123 // Touch
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124 extern "C" void Java_org_libsdl_app_SDLActivity_onNativeTouch(
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125 JNIEnv* env, jclass jcls,
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126 jint action, jfloat x, jfloat y, jfloat p)
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127 {
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128 Android_OnTouch(action, x, y, p);
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129 }
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130
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131 // Accelerometer
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132 extern "C" void Java_org_libsdl_app_SDLActivity_onNativeAccel(
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133 JNIEnv* env, jclass jcls,
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134 jfloat x, jfloat y, jfloat z)
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135 {
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136 fLastAccelerometer[0] = x;
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137 fLastAccelerometer[1] = y;
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138 fLastAccelerometer[2] = z;
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139 }
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140
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141 // Quit
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142 extern "C" void Java_org_libsdl_app_SDLActivity_nativeQuit(
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143 JNIEnv* env, jclass cls)
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144 {
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145 // Inject a SDL_QUIT event
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146 SDL_SendQuit();
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147 }
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148
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149 extern "C" void Java_org_libsdl_app_SDLActivity_nativeRunAudioThread(
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150 JNIEnv* env, jclass cls)
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151 {
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152 /* This is the audio thread, with a different environment */
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153 mAudioEnv = env;
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154
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155 Android_RunAudioThread();
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156 }
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157
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158
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159 /*******************************************************************************
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160 Functions called by SDL into Java
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161 *******************************************************************************/
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162 extern "C" void Android_JNI_CreateContext()
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163 {
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164 mEnv->CallStaticVoidMethod(mActivityClass, midCreateGLContext);
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165 }
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166
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167 extern "C" void Android_JNI_SwapWindow()
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168 {
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169 mEnv->CallStaticVoidMethod(mActivityClass, midFlipBuffers);
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170 }
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171
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172 extern "C" void Android_JNI_SetActivityTitle(const char *title)
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173 {
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174 jmethodID mid;
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175
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176 mid = mEnv->GetStaticMethodID(mActivityClass,"setActivityTitle","(Ljava/lang/String;)V");
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177 if (mid) {
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178 mEnv->CallStaticVoidMethod(mActivityClass, mid, mEnv->NewStringUTF(title));
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179 }
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180 }
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181
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182 extern "C" void Android_JNI_GetAccelerometerValues(float values[3])
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183 {
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184 int i;
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185 for (i = 0; i < 3; ++i) {
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186 values[i] = fLastAccelerometer[i];
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187 }
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188 }
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189
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190 //
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191 // Audio support
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192 //
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193 static jboolean audioBuffer16Bit = JNI_FALSE;
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194 static jboolean audioBufferStereo = JNI_FALSE;
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195 static jobject audioBuffer = NULL;
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196 static void* audioBufferPinned = NULL;
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197
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198 extern "C" int Android_JNI_OpenAudioDevice(int sampleRate, int is16Bit, int channelCount, int desiredBufferFrames)
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199 {
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200 int audioBufferFrames;
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201
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202 __android_log_print(ANDROID_LOG_VERBOSE, "SDL", "SDL audio: opening device");
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203 audioBuffer16Bit = is16Bit;
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204 audioBufferStereo = channelCount > 1;
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205
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206 audioBuffer = mEnv->CallStaticObjectMethod(mActivityClass, midAudioInit, sampleRate, audioBuffer16Bit, audioBufferStereo, desiredBufferFrames);
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207
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208 if (audioBuffer == NULL) {
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209 __android_log_print(ANDROID_LOG_WARN, "SDL", "SDL audio: didn't get back a good audio buffer!");
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210 return 0;
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211 }
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212 audioBuffer = mEnv->NewGlobalRef(audioBuffer);
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213
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214 jboolean isCopy = JNI_FALSE;
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215 if (audioBuffer16Bit) {
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216 audioBufferPinned = mEnv->GetShortArrayElements((jshortArray)audioBuffer, &isCopy);
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217 audioBufferFrames = mEnv->GetArrayLength((jshortArray)audioBuffer);
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218 } else {
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219 audioBufferPinned = mEnv->GetByteArrayElements((jbyteArray)audioBuffer, &isCopy);
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220 audioBufferFrames = mEnv->GetArrayLength((jbyteArray)audioBuffer);
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221 }
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222 if (audioBufferStereo) {
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223 audioBufferFrames /= 2;
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224 }
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225
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226 return audioBufferFrames;
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227 }
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228
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229 extern "C" void * Android_JNI_GetAudioBuffer()
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230 {
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231 return audioBufferPinned;
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232 }
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233
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234 extern "C" void Android_JNI_WriteAudioBuffer()
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235 {
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236 if (audioBuffer16Bit) {
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237 mAudioEnv->ReleaseShortArrayElements((jshortArray)audioBuffer, (jshort *)audioBufferPinned, JNI_COMMIT);
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238 mAudioEnv->CallStaticVoidMethod(mActivityClass, midAudioWriteShortBuffer, (jshortArray)audioBuffer);
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239 } else {
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240 mAudioEnv->ReleaseByteArrayElements((jbyteArray)audioBuffer, (jbyte *)audioBufferPinned, JNI_COMMIT);
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241 mAudioEnv->CallStaticVoidMethod(mActivityClass, midAudioWriteByteBuffer, (jbyteArray)audioBuffer);
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242 }
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243
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244 /* JNI_COMMIT means the changes are committed to the VM but the buffer remains pinned */
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245 }
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246
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247 extern "C" void Android_JNI_CloseAudioDevice()
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248 {
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249 mEnv->CallStaticVoidMethod(mActivityClass, midAudioQuit);
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250
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251 if (audioBuffer) {
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252 mEnv->DeleteGlobalRef(audioBuffer);
a21501393bef Removed code from GetPrimtiveArrayCritical() experiment
Sam Lantinga <slouken@libsdl.org>
parents: 4996
diff changeset
253 audioBuffer = NULL;
a21501393bef Removed code from GetPrimtiveArrayCritical() experiment
Sam Lantinga <slouken@libsdl.org>
parents: 4996
diff changeset
254 audioBufferPinned = NULL;
a21501393bef Removed code from GetPrimtiveArrayCritical() experiment
Sam Lantinga <slouken@libsdl.org>
parents: 4996
diff changeset
255 }
4964
6c645018741e Build the SDL library as a shared object on Android, so it will work correctly with SDL_image and SDL_ttf.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
256 }
4981
55b82067815b Fill in the video mode with the correct screen format
Sam Lantinga <slouken@libsdl.org>
parents: 4980
diff changeset
257
55b82067815b Fill in the video mode with the correct screen format
Sam Lantinga <slouken@libsdl.org>
parents: 4980
diff changeset
258 /* vi: set ts=4 sw=4 expandtab: */