SDL  2.0
SDL_androidevents.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 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 #if !SDL_AUDIO_DISABLED
33 /* Can't include sysaudio "../../audio/android/SDL_androidaudio.h"
34  * because of THIS redefinition */
35 extern void ANDROIDAUDIO_ResumeDevices(void);
36 extern void ANDROIDAUDIO_PauseDevices(void);
37 #else
38 static void ANDROIDAUDIO_ResumeDevices(void) {}
39 static void ANDROIDAUDIO_PauseDevices(void) {}
40 #endif
41 
42 static void
43 android_egl_context_restore()
44 {
47  if (SDL_GL_MakeCurrent(Android_Window, (SDL_GLContext) data->egl_context) < 0) {
48  /* The context is no longer valid, create a new one */
51  event.type = SDL_RENDER_DEVICE_RESET;
53  }
54 }
55 
56 static void
57 android_egl_context_backup()
58 {
59  /* Keep a copy of the EGL Context so we can try to restore it when we resume */
61  data->egl_context = SDL_GL_GetCurrentContext();
62  /* We need to do this so the EGLSurface can be freed */
64 }
65 
66 void
68 {
69  static int isPaused = 0;
70 #if SDL_ANDROID_BLOCK_ON_PAUSE
71  static int isPausing = 0;
72 #endif
73  /* No polling necessary */
74 
75  /*
76  * Android_ResumeSem and Android_PauseSem are signaled from Java_org_libsdl_app_SDLActivity_nativePause and Java_org_libsdl_app_SDLActivity_nativeResume
77  * 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.
78  */
79 
80 #if SDL_ANDROID_BLOCK_ON_PAUSE
81  if (isPaused && !isPausing) {
82  /* Make sure this is the last thing we do before pausing */
83  android_egl_context_backup();
85  if(SDL_SemWait(Android_ResumeSem) == 0) {
86 #else
87  if (isPaused) {
89 #endif
90  isPaused = 0;
92  /* Restore the GL Context from here, as this operation is thread dependent */
93  if (!SDL_HasEvent(SDL_QUIT)) {
94  android_egl_context_restore();
95  }
96  }
97  }
98  else {
99 #if SDL_ANDROID_BLOCK_ON_PAUSE
100  if( isPausing || SDL_SemTryWait(Android_PauseSem) == 0 ) {
101  /* We've been signaled to pause, but before we block ourselves,
102  we need to make sure that certain key events have reached the app */
104  isPausing = 1;
105  }
106  else {
107  isPausing = 0;
108  isPaused = 1;
109  }
110  }
111 #else
112  if(SDL_SemTryWait(Android_PauseSem) == 0) {
113  android_egl_context_backup();
115  isPaused = 1;
116  }
117 #endif
118  }
119 }
120 
121 #endif /* SDL_VIDEO_DRIVER_ANDROID */
122 
123 /* vi: set ts=4 sw=4 expandtab: */
Android_PumpEvents
void Android_PumpEvents(_THIS)
EGLContext
void * EGLContext
Definition: egl.h:60
SDL_events.h
SDL_androidevents.h
SDL_APP_DIDENTERBACKGROUND
@ SDL_APP_DIDENTERBACKGROUND
Definition: SDL_events.h:75
NULL
#define NULL
Definition: begin_code.h:164
SDL_GL_CreateContext
#define SDL_GL_CreateContext
Definition: SDL_dynapi_overrides.h:559
SDL_WindowData
Definition: SDL_androidwindow.h:36
data
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1974
SDL_SemTryWait
#define SDL_SemTryWait
Definition: SDL_dynapi_overrides.h:267
SDL_GLContext
void * SDL_GLContext
An opaque handle to an OpenGL context.
Definition: SDL_video.h:193
event
struct _cl_event * event
Definition: SDL_opengl_glext.h:2649
SDL_androidwindow.h
SDL_PushEvent
#define SDL_PushEvent
Definition: SDL_dynapi_overrides.h:125
SDL_QUIT
@ SDL_QUIT
Definition: SDL_events.h:60
_THIS
#define _THIS
Definition: SDL_alsa_audio.h:31
SDL_APP_WILLENTERBACKGROUND
@ SDL_APP_WILLENTERBACKGROUND
Definition: SDL_events.h:71
SDL_GL_GetCurrentContext
#define SDL_GL_GetCurrentContext
Definition: SDL_dynapi_overrides.h:562
Android_PauseSem
SDL_sem * Android_PauseSem
ANDROIDAUDIO_PauseDevices
void ANDROIDAUDIO_PauseDevices(void)
Definition: SDL_androidaudio.c:206
SDL_Window::driverdata
void * driverdata
Definition: SDL_sysvideo.h:111
SDL_SemWait
#define SDL_SemWait
Definition: SDL_dynapi_overrides.h:266
SDL_RENDER_DEVICE_RESET
@ SDL_RENDER_DEVICE_RESET
Definition: SDL_events.h:155
SDL_GL_MakeCurrent
#define SDL_GL_MakeCurrent
Definition: SDL_dynapi_overrides.h:560
ANDROIDAUDIO_ResumeDevices
void ANDROIDAUDIO_ResumeDevices(void)
Definition: SDL_androidaudio.c:205
SDL_HasEvent
#define SDL_HasEvent
Definition: SDL_dynapi_overrides.h:118
SDL_Event
General event structure.
Definition: SDL_events.h:558
SDL_WINDOWEVENT
@ SDL_WINDOWEVENT
Definition: SDL_events.h:92
Android_Window
SDL_Window * Android_Window
Android_ResumeSem
SDL_sem * Android_ResumeSem
Definition: SDL_androidvideo.h:45