Fixed bug 2407 - Support for OpenGL ES 3 contexts on iOS

Alex Szpakowski

Currently the UIKit/EAGL backend for SDL's OpenGL context creation API doesn't support OpenGL ES 3, despite iOS 7+ being capable (on devices with the necessary hardware.)

I have attached a patch to add support. It's also slightly more future-proof, so eventual OpenGL ES 4+ capability on iOS should hopefully work without requiring changes to SDL's UIKit/EAGL backend.
Fixed bug 2414 - Execute event watchers in the order they were added

Leonardo

Event watchers are being executed on the inverse order they are added because they are added to the head of the SDL_event_watchers list.

Since watchers are allowed to change events before they are reported (they shouldn't, imo), this breaks code that rely on watcher execution order (such as distributed event handling).

An easy scenario to see this behaving weird to the user is if you add an event watcher to check mouse coordinates and check them again in your event loop. If you add the watcher after renderer's one (which always happens after you have initialized renderer), you get the same event but different coordinates.

The proposed patch adds the event watcher in the tail of the list, not in the beginning, and correctly fixes this problem.
Fix audio conversion when channel count changes

- Use the SDL_AUDIO_MASK_DATATYPE bit when selecting an implementation
  where it matters. Previously two existing AUDIO_F32 cases had been
  written, but were unreachable.
- Add AUDIO_F32 case for SDL_ConvertSurround_4.
- Fix incorrect pointer arithmetic causing the 2 to 6 channel
  conversion for 4 byte audio formats to read and write beyond the end
  of the buffer.
Fixed bug 2298 - undefined reference to `IID_IUnknown' on cygwin

Brian Minton

When building static or shared libraries on cygwin 1.7.25 on Windows 7 (32-bit), I get the following link errors:

build/.libs/SDL_windowskeyboard.o: In function `UIElementSink_QueryInterface@12':
/home/c-bminton/src/SDL/src/video/windows/SDL_windowskeyboard.c:995: undefined reference to `IID_IUnknown'
build/.libs/SDL_windowskeyboard.o: In function `IPPASink_QueryInterface@12':
/home/c-bminton/src/SDL/src/video/windows/SDL_windowskeyboard.c:1101: undefined reference to `IID_IUnknown'
collect2: error: ld returned 1 exit status
Makefile:126: recipe for target 'build/libSDL2.la' failed
make: *** [build/libSDL2.la] Error 1

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The libuuid from e2fsprogs is completely unrelated to the w32api UUID.DLL implib. FWIW, any *NIX software that I've seen obviously wants the e2fsprogs version, but if libuuid-devel is installed (in /usr/lib) then you can't link against the w32api implib with a simple -luuid.