README-macosx.txt
author Sam Lantinga <slouken@libsdl.org>
Sat, 27 Jul 2013 03:20:09 -0700
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Fixed bug 1272 - Bogus numlock key up/down events being reported on MacOS X Vern Jensen The problem is that in certain situations I'm getting THREE keyUp/keyDown events when I push certain keys. In my event code I added: case SDL_KEYUP: printf("SDL KeyScanCode for KEYUP event: %d\n", event->key.keysym.scancode ); … and case SDL_KEYDOWN: printf("SDL KeyScanCode for KEYDOWN event: %d\n", event->key.keysym.scancode ); … The result of one test run where I push 2 keys and then release them is this: SDL KeyScanCode for KEYDOWN event: 92 // Pushed keypad 4 SDL KeyScanCode for KEYDOWN event: 83 // Pushed left shift SDL KeyScanCode for KEYUP event: 83 SDL KeyScanCode for KEYDOWN event: 225 SDL KeyScanCode for KEYUP event: 92 // Released keypad 4 SDL KeyScanCode for KEYDOWN event: 83 SDL KeyScanCode for KEYUP event: 83 SDL KeyScanCode for KEYUP event: 225 // Released left shift There *should* be only a total of 4 events above… 2 for each key being pushed, and 2 for each being released. But instead some bogus events for numlock being pushed/released are sent from SDL. These events did not occur. I did not push numlock. The value above for numlock is 83. Comments above show when I pushed each key. As you can see, when I push left shift, THREE events are instantly sent to my application, keyDown and then keyUp for numlock, and then the valid event for left shift (the key that was actually pushed). You could replace keypad 4 with pretty much any keyPad key and it'll still happen. You can also replace it with any arrow key and it'll happen. However, when trying it with normal letter keys on the main keyboard it didn't. It happens with other modifier keys too, not just left shift. The order in which the keys are pressed matter. For instance, if I do: 1) keypad 4 2) left shift 3) release left shift 4) release keypad 4 Then at step 2, I get the 3 events above (when there should be only one), but steps 3 and 4 work properly… I don't get extra keyUp/keyDown events for steps 3 or 4. Thereas if the order of steps 3 and 4 are reversed, I get the bogus extra events for numlock. Also, the problem can occur even when pushing just a single key by itself. If I push left shift, then keypad 4, then release left shift, then release keypad 4, then the following push of left shift will cause the bug. If I continue pushing and releasing left shift though, it won't happen again until I again involve keypad keys. --- Sam Lantinga According to the Apple documentation, NSNumericPadKeyMask is set for any arrow or numeric keypad event. Indeed this is what's happening. I verified that we get the correct events for the numlock key and the mod state gets set correcly, so it should be safe to remove this bogus code.
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==============================================================================
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Using the Simple DirectMedia Layer with Mac OS X
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==============================================================================
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These instructions are for people using Apple's Mac OS X (pronounced
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"ten").
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From the developer's point of view, OS X is a sort of hybrid Mac and
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Unix system, and you have the option of using either traditional
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command line tools or Apple's IDE Xcode.
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To build SDL using the command line, use the standard configure and make
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process:
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	./configure
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	make
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	sudo make install
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You can also build SDL as a Universal library (a single binary for both
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PowerPC and Intel architectures), on Mac OS X 10.4 and newer, by using
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the fatbuild.sh script in build-scripts:
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	sh build-scripts/fatbuild.sh
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	sudo build-scripts/fatbuild.sh install
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This script builds SDL with 10.2 ABI compatibility on PowerPC and 10.4
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ABI compatibility on Intel architectures.  For best compatibility you
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should compile your application the same way.  A script which wraps
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gcc to make this easy is provided in test/gcc-fat.sh
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To use the library once it's built, you essential have two possibilities:
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use the traditional autoconf/automake/make method, or use Xcode.
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==============================================================================
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Using the Simple DirectMedia Layer with a traditional Makefile
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==============================================================================
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An existing autoconf/automake build system for your SDL app has good chances
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to work almost unchanged on OS X. However, to produce a "real" Mac OS X binary
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that you can distribute to users, you need to put the generated binary into a
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so called "bundle", which basically is a fancy folder with a name like
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"MyCoolGame.app".
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To get this build automatically, add something like the following rule to
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your Makefile.am:
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bundle_contents = APP_NAME.app/Contents
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APP_NAME_bundle: EXE_NAME
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	mkdir -p $(bundle_contents)/MacOS
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	mkdir -p $(bundle_contents)/Resources
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	echo "APPL????" > $(bundle_contents)/PkgInfo
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	$(INSTALL_PROGRAM) $< $(bundle_contents)/MacOS/
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You should replace EXE_NAME with the name of the executable. APP_NAME is what
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will be visible to the user in the Finder. Usually it will be the same
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as EXE_NAME but capitalized. E.g. if EXE_NAME is "testgame" then APP_NAME 
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usually is "TestGame". You might also want to use @PACKAGE@ to use the package
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name as specified in your configure.in file.
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If your project builds more than one application, you will have to do a bit
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more. For each of your target applications, you need a separate rule.
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If you want the created bundles to be installed, you may want to add this
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rule to your Makefile.am:
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install-exec-hook: APP_NAME_bundle
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	rm -rf $(DESTDIR)$(prefix)/Applications/APP_NAME.app
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	mkdir -p $(DESTDIR)$(prefix)/Applications/
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	cp -r $< /$(DESTDIR)$(prefix)Applications/
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This rule takes the Bundle created by the rule from step 3 and installs them
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into $(DESTDIR)$(prefix)/Applications/.
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Again, if you want to install multiple applications, you will have to augment
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the make rule accordingly.
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But beware! That is only part of the story! With the above, you end up with
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a bare bone .app bundle, which is double clickable from the Finder. But
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there are some more things you should do before shipping your product...
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1) The bundle right now probably is dynamically linked against SDL. That 
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   means that when you copy it to another computer, *it will not run*,
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   unless you also install SDL on that other computer. A good solution
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   for this dilemma is to static link against SDL. On OS X, you can
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   achieve that by linking against the libraries listed by
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     sdl-config --static-libs
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   instead of those listed by
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     sdl-config --libs
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   Depending on how exactly SDL is integrated into your build systems, the
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   way to achieve that varies, so I won't describe it here in detail
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2) Add an 'Info.plist' to your application. That is a special XML file which
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   contains some meta-information about your application (like some copyright
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   information, the version of your app, the name of an optional icon file,
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   and other things). Part of that information is displayed by the Finder
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   when you click on the .app, or if you look at the "Get Info" window.
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   More information about Info.plist files can be found on Apple's homepage.
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As a final remark, let me add that I use some of the techniques (and some
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variations of them) in Exult and ScummVM; both are available in source on
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the net, so feel free to take a peek at them for inspiration!
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==============================================================================
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Using the Simple DirectMedia Layer with Xcode
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==============================================================================
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These instructions are for using Apple's Xcode IDE to build SDL applications.
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- First steps
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The first thing to do is to unpack the Xcode.tar.gz archive in the
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top level SDL directory (where the Xcode.tar.gz archive resides).
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Because Stuffit Expander will unpack the archive into a subdirectory,
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you should unpack the archive manually from the command line:
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	cd [path_to_SDL_source]
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	tar zxf Xcode.tar.gz
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This will create a new folder called Xcode, which you can browse
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normally from the Finder.
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- Building the Framework
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The SDL Library is packaged as a framework bundle, an organized
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relocatable folder hierarchy of executable code, interface headers,
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and additional resources. For practical purposes, you can think of a 
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framework as a more user and system-friendly shared library, whose library
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file behaves more or less like a standard UNIX shared library.
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To build the framework, simply open the framework project and build it. 
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By default, the framework bundle "SDL.framework" is installed in 
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/Library/Frameworks. Therefore, the testers and project stationary expect
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it to be located there. However, it will function the same in any of the
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following locations:
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    ~/Library/Frameworks
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    /Local/Library/Frameworks
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    /System/Library/Frameworks
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- Build Options
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    There are two "Build Styles" (See the "Targets" tab) for SDL.
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    "Deployment" should be used if you aren't tweaking the SDL library.
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    "Development" should be used to debug SDL apps or the library itself.
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- Building the Testers
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    Open the SDLTest project and build away!
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- Using the Project Stationary
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    Copy the stationary to the indicated folders to access it from
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    the "New Project" and "Add target" menus. What could be easier?
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- Setting up a new project by hand
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    Some of you won't want to use the Stationary so I'll give some tips:
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    * Create a new "Cocoa Application"
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    * Add src/main/macosx/SDLMain.m , .h and .nib to your project
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    * Remove "main.c" from your project
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    * Remove "MainMenu.nib" from your project
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    * Add "$(HOME)/Library/Frameworks/SDL.framework/Headers" to include path
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    * Add "$(HOME)/Library/Frameworks" to the frameworks search path
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    * Add "-framework SDL -framework Foundation -framework AppKit" to "OTHER_LDFLAGS"
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    * Set the "Main Nib File" under "Application Settings" to "SDLMain.nib"
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    * Add your files
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    * Clean and build
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- Building from command line
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    Use pbxbuild in the same directory as your .pbproj file
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- Running your app
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    You can send command line args to your app by either invoking it from
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    the command line (in *.app/Contents/MacOS) or by entering them in the
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    "Executables" panel of the target settings.
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- Implementation Notes
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    Some things that may be of interest about how it all works...
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    * Working directory
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        As defined in the SDL_main.m file, the working directory of your SDL app
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        is by default set to its parent. You may wish to change this to better
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        suit your needs.
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    * You have a Cocoa App!
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        Your SDL app is essentially a Cocoa application. When your app
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        starts up and the libraries finish loading, a Cocoa procedure is called,
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        which sets up the working directory and calls your main() method.
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        You are free to modify your Cocoa app with generally no consequence 
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        to SDL. You cannot, however, easily change the SDL window itself.
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        Functionality may be added in the future to help this.
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Known bugs are listed in the file "BUGS"