kc3-lang/SDL/docs/README-directfb.md

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• Hash : 0e45984f
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  Date : 2015-06-21T17:33:46
  

  Fixed crash if initialization of EGL failed but was tried again later. The internal function SDL_EGL_LoadLibrary() did not delete and remove a mostly uninitialized data structure if loading the library first failed. A later try to use EGL then skipped initialization and assumed it was previously successful because the data structure now already existed. This led to at least one crash in the internal function SDL_EGL_ChooseConfig() because a NULL pointer was dereferenced to make a call to eglBindAPI().

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• docs/README-directfb.md

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

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