kc3-lang/SDL/src/video/android/SDL_androidevents.c

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• Hash : 47658057
  Author :
  Date : 2014-09-18T11:03:34
  

  [Android] Better fix for #2480, pause/resume audio

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• src/video/android/SDL_androidevents.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  #include "../../SDL_internal.h"
  
  #if SDL_VIDEO_DRIVER_ANDROID
  
  /* We're going to do this by default */
  #define SDL_ANDROID_BLOCK_ON_PAUSE  1
  
  #include "SDL_androidevents.h"
  #include "SDL_events.h"
  #include "SDL_androidwindow.h"
  
  
  void android_egl_context_backup();
  void android_egl_context_restore();
  void AndroidAUD_ResumeDevices(void);
  void AndroidAUD_PauseDevices(void);
  
  void 
  android_egl_context_restore() 
  {
      SDL_Event event;
      SDL_WindowData *data = (SDL_WindowData *) Android_Window->driverdata;
      if (SDL_GL_MakeCurrent(Android_Window, (SDL_GLContext) data->egl_context) < 0) {
          /* The context is no longer valid, create a new one */
          data->egl_context = (EGLContext) SDL_GL_CreateContext(Android_Window);
          SDL_GL_MakeCurrent(Android_Window, (SDL_GLContext) data->egl_context);
          event.type = SDL_RENDER_DEVICE_RESET;
          SDL_PushEvent(&event);
      }
  }
  
  void 
  android_egl_context_backup() 
  {
      /* Keep a copy of the EGL Context so we can try to restore it when we resume */
      SDL_WindowData *data = (SDL_WindowData *) Android_Window->driverdata;
      data->egl_context = SDL_GL_GetCurrentContext();
      /* We need to do this so the EGLSurface can be freed */
      SDL_GL_MakeCurrent(Android_Window, NULL);
  }
  
  void
  Android_PumpEvents(_THIS)
  {
      static int isPaused = 0;
  #if SDL_ANDROID_BLOCK_ON_PAUSE
      static int isPausing = 0;
  #endif
      /* No polling necessary */
  
      /*
       * Android_ResumeSem and Android_PauseSem are signaled from Java_org_libsdl_app_SDLActivity_nativePause and Java_org_libsdl_app_SDLActivity_nativeResume
       * When the pause semaphore is signaled, if SDL_ANDROID_BLOCK_ON_PAUSE is defined the event loop will block until the resume signal is emitted.
       */
  
  #if SDL_ANDROID_BLOCK_ON_PAUSE
      if (isPaused && !isPausing) {
          /* Make sure this is the last thing we do before pausing */
          android_egl_context_backup();
          AndroidAUD_PauseDevices();
          if(SDL_SemWait(Android_ResumeSem) == 0) {
  #else
      if (isPaused) {
          if(SDL_SemTryWait(Android_ResumeSem) == 0) {
  #endif
              isPaused = 0;
              AndroidAUD_ResumeDevices();
              /* Restore the GL Context from here, as this operation is thread dependent */
              if (!SDL_HasEvent(SDL_QUIT)) {
                  android_egl_context_restore();
              }
          }
      }
      else {
  #if SDL_ANDROID_BLOCK_ON_PAUSE
          if( isPausing || SDL_SemTryWait(Android_PauseSem) == 0 ) {
              /* We've been signaled to pause, but before we block ourselves, 
              we need to make sure that certain key events have reached the app */
              if (SDL_HasEvent(SDL_WINDOWEVENT) || SDL_HasEvent(SDL_APP_WILLENTERBACKGROUND) || SDL_HasEvent(SDL_APP_DIDENTERBACKGROUND) ) {
                  isPausing = 1;
              }
              else {
                  isPausing = 0;
                  isPaused = 1;
              }
          }
  #else
          if(SDL_SemTryWait(Android_PauseSem) == 0) {
              android_egl_context_backup();
              AndroidAUD_PauseDevices();
              isPaused = 1;
          }
  #endif
      }
  }
  
  #endif /* SDL_VIDEO_DRIVER_ANDROID */
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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