SDL  2.0
SDL_androidevents.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2017 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 /* Can't include sysaudio "../../audio/android/SDL_androidaudio.h"
33  * because of THIS redefinition */
34 extern void ANDROIDAUDIO_ResumeDevices(void);
35 extern void ANDROIDAUDIO_PauseDevices(void);
36 
37 static void
38 android_egl_context_restore()
39 {
43  /* The context is no longer valid, create a new one */
46  event.type = SDL_RENDER_DEVICE_RESET;
47  SDL_PushEvent(&event);
48  }
49 }
50 
51 static void
52 android_egl_context_backup()
53 {
54  /* Keep a copy of the EGL Context so we can try to restore it when we resume */
57  /* We need to do this so the EGLSurface can be freed */
59 }
60 
61 void
63 {
64  static int isPaused = 0;
65 #if SDL_ANDROID_BLOCK_ON_PAUSE
66  static int isPausing = 0;
67 #endif
68  /* No polling necessary */
69 
70  /*
71  * Android_ResumeSem and Android_PauseSem are signaled from Java_org_libsdl_app_SDLActivity_nativePause and Java_org_libsdl_app_SDLActivity_nativeResume
72  * 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.
73  */
74 
75 #if SDL_ANDROID_BLOCK_ON_PAUSE
76  if (isPaused && !isPausing) {
77  /* Make sure this is the last thing we do before pausing */
78  android_egl_context_backup();
80  if(SDL_SemWait(Android_ResumeSem) == 0) {
81 #else
82  if (isPaused) {
84 #endif
85  isPaused = 0;
87  /* Restore the GL Context from here, as this operation is thread dependent */
88  if (!SDL_HasEvent(SDL_QUIT)) {
89  android_egl_context_restore();
90  }
91  }
92  }
93  else {
94 #if SDL_ANDROID_BLOCK_ON_PAUSE
95  if( isPausing || SDL_SemTryWait(Android_PauseSem) == 0 ) {
96  /* We've been signaled to pause, but before we block ourselves,
97  we need to make sure that certain key events have reached the app */
99  isPausing = 1;
100  }
101  else {
102  isPausing = 0;
103  isPaused = 1;
104  }
105  }
106 #else
107  if(SDL_SemTryWait(Android_PauseSem) == 0) {
108  android_egl_context_backup();
110  isPaused = 1;
111  }
112 #endif
113  }
114 }
115 
116 #endif /* SDL_VIDEO_DRIVER_ANDROID */
117 
118 /* 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:1974
SDL_sem * Android_PauseSem
void * EGLContext
Definition: egl.h:60
#define SDL_SemTryWait
void * SDL_GLContext
An opaque handle to an OpenGL context.
Definition: SDL_video.h:173
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:164
#define SDL_GL_GetCurrentContext
void ANDROIDAUDIO_ResumeDevices(void)
#define SDL_GL_MakeCurrent
SDL_sem * Android_ResumeSem
#define SDL_HasEvent
#define SDL_SemWait
void ANDROIDAUDIO_PauseDevices(void)
General event structure.
Definition: SDL_events.h:525
void * driverdata
Definition: SDL_sysvideo.h:111