SDL-mirror/README.QNX

README by Mike Gorchak <mike@malva.ua>, <lestat@i.com.ua>
Last changed at 29 Jul 2003.

=========================================================================
OpenGL:

    OpenGL in window mode  works well  and  stable, in fullscreen
mode too, but fullscreen mode has not been heavily tested yet.
    If you have QNX RtP version 6.1.0 and above you must download
new Photon3D runtime from http://developers.qnx.com or install it
from public repository or from public CD, available with QNX. The
versions of OS before 6.1.0 are not supported.
    While  creating  OpenGL  context  software  renderer  mode is
artificially selected (QSSL  made  acceleration  only for  Voodoo
boards in fullscreen mode, sorry but I  don't have  this board to
test OpenGL - maybe it work or maybe not :)). If you want accele-
ration - you may remove some line in source code: find  the  file
SDL_ph_video.c and remove the following

    OGLAttrib[OGLargc++]=PHOGL_ATTRIB_FORCE_SW;
     
line in the ph_SetupOpenGLContext() function or  change  argument
to the PHOGL_ATTRIB_FORCE_HW or PHOGL_ATTRIB_FAVOR_HW.

=========================================================================
Wheel and multibutton mouses:

    Photon emitting keyboard events (key up and down) when  moved
mouse wheel. But key_scan field appears valid according to flags,
and it contain zero. It is base method of detecting  mouse  wheel
events under photon. It looks like a hack, but it works for me :)
on different PC configurations.

I'm tested it on:

1. Genius Optical NetScroll/+ (1 wheel)
2. A4Tech Optical GreatEye WheelMouse, model: WOP-35. (2 wheels +
   2 additional buttons). Wheel for vertical scrolling  works  as
   usual, but second wheel for horizontal scrolling emitting  two
   consequented events up or down, so it can  provide  more  fast
   scrolling then the  first  wheel. Additional  buttons  doesn't
   emitting any events, but its look like  handled by  photon  in
   unusual way - like click to front, but works not with any win-
   dow, looks like bug-o-feature :).

=========================================================================
CDROM handling issues:

    Access to CDROM can be provided only with 'root'  previleges.
I can't do anything with this fact. /dev/cd0 have  the brw-------
flags and root:root rights.

=========================================================================
Video Overlays:

    Overlays can flickering during the window movement, resizing,
etc. It happens because photon driver  updates  the  real  window
contents behind the overlay, then draws the temporary  chroma key
color over window contents. It can be done without the chroma key
using but it cause overlay will be  always  on top. So flickering
during the movement much better in that case.
    Double buffering code temporary disabled in the photon driver
code, beacuse on my GF2-MX it  cause  accidently  buffer  switch,
which going to the old frame showing. S3 Savage3D have  the  same
problem, but ATI Rage 128 has not this problem. I think it can be
fixed later. Current code works very fine, so maybe double buffe-
ring is not needed right now.
    Something strange appears when you tried to move window  with
overlay beyond the left border of the screen. Overlay  trying  to
stay at position x=0, but when tried to move  it  a  bit  more it
jumps  at  posituin  x=-60. Really  strange, looks  like  overlay
doesn't love the negotive coordinates.

=========================================================================
Shared library building:

    Shared  library can be  built, but before  running autogen.sh
script you  need  manually  delete  the  libtool  m4  stuff  from
the acinclude.m4 file (it comes after ESD  detection  code  up to
end of the file). Because libtool stuff in the  acinclude.m4 file
very old and doesn't know anything about the QNX. Just  remove it
and run autogen.sh script.

=========================================================================
Some building issues:

    Feel free to not pass --disable-shared option  to  configure,
if you read comment above about 'Shared library building'. Other-
wise this option is strongly  recomended, because  the sdl-config
script will be unfunctional.

    Run configure script without x11 support, e.g.:

    a) for OpenGL support:
    ./configure --prefix=/usr/local \
                --disable-video-x11 \
                --disable-shared

    b) without OpenGL support:
    ./configure --prefix=/usr/local \
                --disable-video-x11 \
                --disable-shared    \
                --disable-video-opengl

    In test directory  also run  ./configure  script  without x11
support, e.g.:

    ./configure  --with-sdl-prefix=/usr/local      \
                 --with-sdl-exec-prefix=/usr/local \
                 --prefix=/usr/local --without-x