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Merged Alex Szpakowski's iOS-improvement branch to default.
Fixes Bugzilla #2798. Fixes Bugzilla #2212. Fixes Bugzilla #2826. Fixes Bugzilla #2661. Fixes Bugzilla #1885. Fixes Bugzilla #1578. Fixes Bugzilla #2751. (whew!) Notable changes, from Alex's notes: - The SDL_WINDOW_ALLOW_HIGHDPI flag is now needed (along with SDL_GL_GetDrawableSize or SDL_GetRendererOutputSize) to use Retina / high DPI resolutions, bringing SDL?s Retina-related behavior on iOS in line with Mac OS X. Window dimensions and display modes are now in the ?points? (non-high DPI) coordinate system rather than pixels, whereas SDL_GL_GetDrawableSize is in pixels. - Reworked the custom extended launch screen code: - It now hides after the first SDL_PumpEvents call rather than SDL_CreateWindow, and it fades out in a similar manner to the system launch screen behavior. - It now mirrors the system launch screen behavior when deciding which image to display: it falls back to using the Launch Images dictionary in Info.plist if the iOS 8+ launch screen nib isn?t available, and if the Launch Images dictionary doesn?t exist it uses the old standard launch image names. - The extended launch screen can now be disabled via the SDL_IPHONE_LAUNCHSCREEN define in SDL_config_iphoneos.h. - Added support for SDL_HINT_ACCELEROMETER_AS_JOYSTICK. - Added access to a window view's renderbuffer and framebuffer to syswm. - Added OpenGL ES debug labels for the Renderbuffer and Framebuffer Objects created with SDL_GL_CreateContext. - Added support for sRGB OpenGL ES contexts on iOS 7+. - Updated OpenGL ES contexts to support native-resolution rendering (when SDL_WINDOW_ALLOW_HIGHDPI is enabled) on the iPhone 6 Plus, i.e. 1080x1920 rather than 1242x2208. - Updated SDL_GL_CreateContext, SDL_GL_SwapWindow, SDL_GL_MakeCurrent, and SDL_GL_DeleteContext to be more robust. - Updated SDL windows to display a UIView at all times, even when an OpenGL context is not active. This allows rotation, touch events, and other windowing-related events to work properly without an active OpenGL context. It also makes it easier to use SDL_GetWindowWMInfo after creating a SDL window. - Updated the iOS-specific Objective-C code to use cleaner and more modern language features and APIs, including ARC instead of manual reference counting. - Updated SDL_HINT_ORIENTATIONS to allow disabling custom orientations if the hint is set with no valid orientation names. - Fixed several rotation and orientation bugs with windows and display modes, especially in iOS 8+. - Fixed SDL_SetWindowFullscreen failing to update the status bar visibility on iOS 7+. - Fixed the orientation of the offset applied to the window?s view when the onscreen keyboard is shown in iOS 8+. - Fixed SDL_IsScreenKeyboardShown (patch by Phil Hassey.) - Fixed several major memory leaks caused by missing autorelease pool blocks in the iOS-specific Objective-C code. - Removed several dead code paths. - The iOS 7 SDK (Xcode 5) or newer is now required to build SDL for iOS.
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