README-directfb.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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SDL on DirectFB
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Supports:
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- Hardware YUV overlays
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- OpenGL - software only
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- 2D/3D accelerations (depends on directfb driver)
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- multiple displays
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- windows
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What you need:
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DirectFB 1.0.1, 1.2.x, 1.3.0
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Kernel-Framebuffer support: required: vesafb, radeonfb .... 
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Mesa 7.0.x	   - optional for OpenGL
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/etc/directfbrc
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This file should contain the following lines to make
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your joystick work and avoid crashes:
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disable-module=joystick
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disable-module=cle266
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disable-module=cyber5k
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no-linux-input-grab
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To disable to use x11 backend when DISPLAY variable is found use
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export SDL_DIRECTFB_X11_CHECK=0
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To disable the use of linux input devices, i.e. multimice/multikeyboard support,
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use
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export SDL_DIRECTFB_LINUX_INPUT=0
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To use hardware accelerated YUV-overlays for YUV-textures, use:
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export SDL_DIRECTFB_YUV_DIRECT=1
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This is disabled by default. It will only support one 
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YUV texture, namely the first. Every other YUV texture will be
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rendered in software.
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In addition, you may use (directfb-1.2.x)
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export SDL_DIRECTFB_YUV_UNDERLAY=1
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to make the YUV texture an underlay. This will make the cursor to
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be shown.
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Simple Window Manager
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=====================
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The driver has support for a very, very basic window manager you may
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want to use when running with "wm=default". Use
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export SDL_DIRECTFB_WM=1
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to enable basic window borders. In order to have the window title rendered,
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you need to have the following font installed:
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/usr/share/fonts/truetype/freefont/FreeSans.ttf
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OpenGL Support
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==============
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The following instructions will give you *software* OpenGL. However this
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works at least on all directfb supported platforms.
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As of this writing 20100802 you need to pull Mesa from git and do the following:
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git clone git://anongit.freedesktop.org/git/mesa/mesa
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cd mesa 
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git checkout 2c9fdaf7292423c157fc79b5ce43f0f199dd753a
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Edit configs/linux-directfb so that the Directories-section looks like
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# Directories
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SRC_DIRS     = mesa glu 
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GLU_DIRS     = sgi
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DRIVER_DIRS  = directfb
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PROGRAM_DIRS = 
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make linux-directfb
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make
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echo Installing - please enter sudo pw.
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sudo make install INSTALL_DIR=/usr/local/dfb_GL
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cd src/mesa/drivers/directfb
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make
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sudo make install INSTALL_DIR=/usr/local/dfb_GL
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To run the SDL - testprograms:
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export SDL_VIDEODRIVER=directfb
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export LD_LIBRARY_PATH=/usr/local/dfb_GL/lib
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export LD_PRELOAD=/usr/local/dfb_GL/libGL.so.7
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Sam Lantinga <slouken@libsdl.org>
parents: 6987
diff changeset
   105
./testgl
2435b221d77d Renamed documentation files to .txt and converted them to DOS line endings so they would open properly on all systems.
Sam Lantinga <slouken@libsdl.org>
parents: 6987
diff changeset
   106