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SDL_androidevents.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2013 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_config.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 void android_egl_context_backup();
33 void android_egl_context_restore();
34 
35 void
36 android_egl_context_restore()
37 {
40  /* The context is no longer valid, create a new one */
41  /* FIXME: Notify the user that the context changed and textures need to be re created */
44  }
45 }
46 
47 void
48 android_egl_context_backup()
49 {
50  /* Keep a copy of the EGL Context so we can try to restore it when we resume */
53  /* We need to do this so the EGLSurface can be freed */
55 }
56 
57 void
59 {
60  static int isPaused = 0;
61 #if SDL_ANDROID_BLOCK_ON_PAUSE
62  static int isPausing = 0;
63 #endif
64  /* No polling necessary */
65 
66  /*
67  * Android_ResumeSem and Android_PauseSem are signaled from Java_org_libsdl_app_SDLActivity_nativePause and Java_org_libsdl_app_SDLActivity_nativeResume
68  * 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.
69  * When the resume semaphore is signaled, SDL_GL_CreateContext is called which in turn calls Java code
70  * SDLActivity::createGLContext -> SDLActivity:: initEGL -> SDLActivity::createEGLSurface -> SDLActivity::createEGLContext
71  */
72 
73 #if SDL_ANDROID_BLOCK_ON_PAUSE
74  if (isPaused && !isPausing) {
75  if(SDL_SemWait(Android_ResumeSem) == 0) {
76 #else
77  if (isPaused) {
79 #endif
80  isPaused = 0;
81 
82  /* Restore the GL Context from here, as this operation is thread dependent */
83  android_egl_context_restore();
84  }
85  }
86  else {
87 #if SDL_ANDROID_BLOCK_ON_PAUSE
88  if( isPausing || SDL_SemTryWait(Android_PauseSem) == 0 ) {
89  /* We've been signaled to pause, but before we block ourselves,
90  we need to make sure that certain key events have reached the app */
92  isPausing = 1;
93  }
94  else {
95  android_egl_context_backup();
96  isPausing = 0;
97  isPaused = 1;
98  }
99  }
100 #else
101  if(SDL_SemTryWait(Android_PauseSem) == 0) {
102  android_egl_context_backup();
103  isPaused = 1;
104  }
105 #endif
106  }
107 }
108 
109 #endif /* SDL_VIDEO_DRIVER_ANDROID */
110 
111 /* vi: set ts=4 sw=4 expandtab: */
DECLSPEC int SDLCALL SDL_SemTryWait(SDL_sem *sem)
Definition: SDL_syssem.c:130
#define NULL
Definition: ftobjs.h:61
DECLSPEC SDL_GLContext SDLCALL SDL_GL_CreateContext(SDL_Window *window)
Create an OpenGL context for use with an OpenGL window, and make it current.
Definition: SDL_video.c:2758
DECLSPEC int SDLCALL SDL_SemWait(SDL_sem *sem)
Definition: SDL_syssem.c:180
void * SDL_GLContext
An opaque handle to an OpenGL context.
Definition: SDL_video.h:161
if(!yyg->yy_init)
SDL_sem * Android_PauseSem
void * EGLContext
Definition: egl.h:47
DECLSPEC int SDLCALL SDL_GL_MakeCurrent(SDL_Window *window, SDL_GLContext context)
Set up an OpenGL context for rendering into an OpenGL window.
Definition: SDL_video.c:2781
EGLContext egl_context
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: gl2ext.h:848
#define _THIS
SDL_Window * Android_Window
void Android_PumpEvents(_THIS)
DECLSPEC SDL_bool SDLCALL SDL_HasEvent(Uint32 type)
Definition: SDL_events.c:346
SDL_sem * Android_ResumeSem
void * driverdata
Definition: SDL_sysvideo.h:99
DECLSPEC SDL_GLContext SDLCALL SDL_GL_GetCurrentContext(void)
Get the currently active OpenGL context.
Definition: SDL_video.c:2822