SDL  2.0
SDL_androidevents.c
Go to the documentation of this file.
1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
4 
5  This software is provided 'as-is', without any express or implied
6  warranty. In no event will the authors be held liable for any damages
7  arising from the use of this software.
8 
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12 
13  1. The origin of this software must not be misrepresented; you must not
14  claim that you wrote the original software. If you use this software
15  in a product, an acknowledgment in the product documentation would be
16  appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18  misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20 */
21 #include "../../SDL_internal.h"
22 
23 #if SDL_VIDEO_DRIVER_ANDROID
24 
25 /* We're going to do this by default */
26 #define SDL_ANDROID_BLOCK_ON_PAUSE 1
27 
28 #include "SDL_androidevents.h"
29 #include "SDL_events.h"
30 #include "SDL_androidwindow.h"
31 
32 
33 void android_egl_context_backup();
34 void android_egl_context_restore();
35 
36 #if SDL_AUDIO_DRIVER_ANDROID
37 void ANDROIDAUDIO_ResumeDevices(void);
38 void ANDROIDAUDIO_PauseDevices(void);
39 #else
40 static void ANDROIDAUDIO_ResumeDevices(void) {}
41 static void ANDROIDAUDIO_PauseDevices(void) {}
42 #endif
43 
44 void
45 android_egl_context_restore()
46 {
50  /* The context is no longer valid, create a new one */
51  data->egl_context = (EGLContext) SDL_GL_CreateContext(Android_Window);
53  event.type = SDL_RENDER_DEVICE_RESET;
54  SDL_PushEvent(&event);
55  }
56 }
57 
58 void
59 android_egl_context_backup()
60 {
61  /* Keep a copy of the EGL Context so we can try to restore it when we resume */
64  /* We need to do this so the EGLSurface can be freed */
66 }
67 
68 void
70 {
71  static int isPaused = 0;
72 #if SDL_ANDROID_BLOCK_ON_PAUSE
73  static int isPausing = 0;
74 #endif
75  /* No polling necessary */
76 
77  /*
78  * Android_ResumeSem and Android_PauseSem are signaled from Java_org_libsdl_app_SDLActivity_nativePause and Java_org_libsdl_app_SDLActivity_nativeResume
79  * 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.
80  */
81 
82 #if SDL_ANDROID_BLOCK_ON_PAUSE
83  if (isPaused && !isPausing) {
84  /* Make sure this is the last thing we do before pausing */
85  android_egl_context_backup();
86  ANDROIDAUDIO_PauseDevices();
87  if(SDL_SemWait(Android_ResumeSem) == 0) {
88 #else
89  if (isPaused) {
91 #endif
92  isPaused = 0;
93  ANDROIDAUDIO_ResumeDevices();
94  /* Restore the GL Context from here, as this operation is thread dependent */
95  if (!SDL_HasEvent(SDL_QUIT)) {
96  android_egl_context_restore();
97  }
98  }
99  }
100  else {
101 #if SDL_ANDROID_BLOCK_ON_PAUSE
102  if( isPausing || SDL_SemTryWait(Android_PauseSem) == 0 ) {
103  /* We've been signaled to pause, but before we block ourselves,
104  we need to make sure that certain key events have reached the app */
106  isPausing = 1;
107  }
108  else {
109  isPausing = 0;
110  isPaused = 1;
111  }
112  }
113 #else
114  if(SDL_SemTryWait(Android_PauseSem) == 0) {
115  android_egl_context_backup();
116  ANDROIDAUDIO_PauseDevices();
117  isPaused = 1;
118  }
119 #endif
120  }
121 }
122 
123 #endif /* SDL_VIDEO_DRIVER_ANDROID */
124 
125 /* vi: set ts=4 sw=4 expandtab: */
#define SDL_GL_CreateContext
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1967
SDL_sem * Android_PauseSem
#define SDL_SemTryWait
void * SDL_GLContext
An opaque handle to an OpenGL context.
Definition: SDL_video.h:172
EGLContext egl_context
#define _THIS
struct _cl_event * event
#define SDL_PushEvent
SDL_Window * Android_Window
void Android_PumpEvents(_THIS)
#define NULL
Definition: begin_code.h:143
#define SDL_GL_GetCurrentContext
#define SDL_GL_MakeCurrent
SDL_sem * Android_ResumeSem
#define SDL_HasEvent
#define SDL_SemWait
General event structure.
Definition: SDL_events.h:525
void * driverdata
Definition: SDL_sysvideo.h:109