Atlas - SDL_androidevents.c
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
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 */
35extern void ANDROIDAUDIO_ResumeDevices(void);
36extern void ANDROIDAUDIO_PauseDevices(void);
37#else
38static void ANDROIDAUDIO_ResumeDevices(void) {}
39static void ANDROIDAUDIO_PauseDevices(void) {}
40#endif
41
42static void 
43android_egl_context_restore() 
44{
45    SDL_Event event;
46    SDL_WindowData *data = (SDL_WindowData *) Android_Window->driverdata;
47    if (SDL_GL_MakeCurrent(Android_Window, (SDL_GLContext) data->egl_context) < 0) {
48        /* The context is no longer valid, create a new one */
49        data->egl_context = (EGLContext) SDL_GL_CreateContext(Android_Window);
50        SDL_GL_MakeCurrent(Android_Window, (SDL_GLContext) data->egl_context);
51        event.type = SDL_RENDER_DEVICE_RESET;
52        SDL_PushEvent(&event);
53    }
54}
55
56static void 
57android_egl_context_backup() 
58{
59    /* Keep a copy of the EGL Context so we can try to restore it when we resume */
60    SDL_WindowData *data = (SDL_WindowData *) Android_Window->driverdata;
61    data->egl_context = SDL_GL_GetCurrentContext();
62    /* We need to do this so the EGLSurface can be freed */
63    SDL_GL_MakeCurrent(Android_Window, NULL);
64}
65
66void
67Android_PumpEvents(_THIS)
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();
84        ANDROIDAUDIO_PauseDevices();
85        if(SDL_SemWait(Android_ResumeSem) == 0) {
86#else
87    if (isPaused) {
88        if(SDL_SemTryWait(Android_ResumeSem) == 0) {
89#endif
90            isPaused = 0;
91            ANDROIDAUDIO_ResumeDevices();
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 */
103            if (SDL_HasEvent(SDL_WINDOWEVENT) || SDL_HasEvent(SDL_APP_WILLENTERBACKGROUND) || SDL_HasEvent(SDL_APP_DIDENTERBACKGROUND) ) {
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();
114            ANDROIDAUDIO_PauseDevices();
115            isPaused = 1;
116        }
117#endif
118    }
119}
120
121#endif /* SDL_VIDEO_DRIVER_ANDROID */
122
123/* vi: set ts=4 sw=4 expandtab: */
124
[FILE END]
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