Function init

android/main.cpp:27–119

void bindImageTextureFunctions();

void init(struct android_app *app)
{
    if (g_Initialized)
        return;

    g_App = app;
    ANativeWindow_acquire(g_App->window);

    // Initialize EGL
    // This is mostly boilerplate code for EGL...
    {
        g_EglDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
        if (g_EglDisplay == EGL_NO_DISPLAY)
            __android_log_print(ANDROID_LOG_ERROR, g_LogTag, "%s", "eglGetDisplay(EGL_DEFAULT_DISPLAY) returned EGL_NO_DISPLAY");

        if (eglInitialize(g_EglDisplay, 0, 0) != EGL_TRUE)
            __android_log_print(ANDROID_LOG_ERROR, g_LogTag, "%s", "eglInitialize() returned with an error");

        const EGLint egl_attributes[] = {EGL_BLUE_SIZE, 8, EGL_GREEN_SIZE, 8, EGL_RED_SIZE, 8, EGL_DEPTH_SIZE, 24, EGL_SURFACE_TYPE, EGL_WINDOW_BIT, EGL_NONE};
        EGLint num_configs = 0;
        if (eglChooseConfig(g_EglDisplay, egl_attributes, nullptr, 0, &num_configs) != EGL_TRUE)
            __android_log_print(ANDROID_LOG_ERROR, g_LogTag, "%s", "eglChooseConfig() returned with an error");
        if (num_configs == 0)
            __android_log_print(ANDROID_LOG_ERROR, g_LogTag, "%s", "eglChooseConfig() returned 0 matching config");

        // Get the first matching config
        EGLConfig egl_config;
        eglChooseConfig(g_EglDisplay, egl_attributes, &egl_config, 1, &num_configs);
        EGLint egl_format;
        eglGetConfigAttrib(g_EglDisplay, egl_config, EGL_NATIVE_VISUAL_ID, &egl_format);
        ANativeWindow_setBuffersGeometry(g_App->window, 0, 0, egl_format);

        const EGLint egl_context_attributes[] = {EGL_CONTEXT_CLIENT_VERSION, 3, EGL_NONE};
        g_EglContext = eglCreateContext(g_EglDisplay, egl_config, EGL_NO_CONTEXT, egl_context_attributes);

        if (g_EglContext == EGL_NO_CONTEXT)
            __android_log_print(ANDROID_LOG_ERROR, g_LogTag, "%s", "eglCreateContext() returned EGL_NO_CONTEXT");

        g_EglSurface = eglCreateWindowSurface(g_EglDisplay, egl_config, g_App->window, NULL);
        eglMakeCurrent(g_EglDisplay, g_EglSurface, g_EglSurface, g_EglContext);
    }

    if (!was_init)
    {
        // Setup Dear ImGui context
        IMGUI_CHECKVERSION();
        ImGui::CreateContext();
        ImGuiIO &io = ImGui::GetIO();

        // Disable loading/saving of .ini file from disk.
        // FIXME: Consider using LoadIniSettingsFromMemory() / SaveIniSettingsToMemory() to save in appropriate location for Android.
        io.IniFilename = NULL;
    }

    // Setup Platform/Renderer backends
    ImGui_ImplAndroid_Init(g_App->window);
    ImGui_ImplOpenGL3_Init("#version 300 es");