README.QNX
author Sam Lantinga <slouken@libsdl.org>
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Date: Thu, 4 Dec 2003 07:48:40 +0200 From: "Mike Gorchak" Subject: SDL/QNX6 new patch Here in attachment my patch for the SDL/QNX6 again :) It contain non-crtitical/cosmetic fixes: 1. Fixed window centering at other than the first consoles. 2. Fixed window centering algorithm in case when window height or width are greater than the desktop resolution. 3. Fixed window positioning on other than the first consoles. 4. Fixed occasional input focus lost when switching to fullscreen. 5. Removed the Photon's default chroma color for the overlays, added RGB(12, 6, 12) color instead (very dark pink). 6. Added more checks to the YUV overlay code (fixed crashes during resolution mode switches). 7. Added support for Enter/Backspace keys in unicode mode (used by Maelstrom and by other games). 8. Fixed window restore/maximize function. It works, finally.
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README by Mike Gorchak <mike@malva.ua>, <lestat@i.com.ua>
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Last changed at 30 Sep 2003.
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======================================================================
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Table of Contents:
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1. OpenGL.
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2. Wheel and multi-button mouses.
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3. CDROM handling issues.
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4. Hardware video overlays.
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5. Shared library building.
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6. Some building issues.
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7. Environment variables.
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======================================================================
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OpenGL:
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    OpenGL works well and is stable, but fullscreen mode has not  been
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heavily tested yet.
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    If you have QNX RtP version 6.1.0 or above you must  download  the
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Photon3D runtime from http://developers.qnx.com or install it from the
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public repository or the  public CD, available  with  QNX. OS versions
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below 6.1.0 are not supported.
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    When creating an OpenGL context, software renderer mode is artifi-
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cially selected (QSSL made acceleration  only  for  Voodoo  boards  in
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fullscreen mode, sorry but I don't have this board  to  test  OpenGL -
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maybe it works or maybe not :)). If you  want  acceleration - you  can
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remove one line in the source code: find the  file SDL_ph_image.c  and
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remove the following
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    OGLAttrib[OGLargc++]=PHOGL_ATTRIB_FORCE_SW;
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line in the ph_SetupOpenGLContext() function or change the argument to
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PHOGL_ATTRIB_FORCE_HW or PHOGL_ATTRIB_FAVOR_HW.
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======================================================================
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Wheel and multi-button mouses:
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    Photon emits  keyboard  events (key up and down)  when  the  mouse
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wheel is moved. The key_scan field appears valid, and it contains zero.
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That is a basic method of detecting  mouse  wheel events under Photon.
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It looks like a hack, but it works for me :) on various PC  configura-
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tions.
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I've tested it on:
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1. Genius Optical NetScroll/+ (1 wheel)
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2. A4Tech Optical  GreatEye  WheelMouse,  model: WOP-35. (2 wheels + 2
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   additional buttons). The wheel for vertical scrolling works as usu-
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   al, but the second wheel for horizontal scrolling emits two sequen-
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   tial events up or down, so it can provide faster scrolling than the
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   first wheel. Additional buttons don't emit any events, but it looks
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   like they're handled by photon in an unusual  way - like  click  to
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   front, but works not with any window, looks like bug-o-feature :).
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======================================================================
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CDROM handling issues:
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    Access to CDROM can only be  provided  with  'root'  privileges. I
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can't do anything about that, /dev/cd0 has brw------- permissions  and
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root:root rights.
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======================================================================
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Hardware video overlays:
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    Overlays can flicker  during  window  movement,  resizing, etc. It
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happens because the photon driver updates the real window contents be-
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hind the overlay, then draws the temporary chroma key color  over  the
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window contents. It can be done without using the chroma key but  that
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causes the overlay to always be on top. So  flickering  during  window
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movement is preferred instead.
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    Double buffering code is temporarily disabled in the photon driver
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code, because on my GF2-MX it can accidentally cause a buffer  switch,
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which causes the old frame to show. S3 Savage4 has the  same  problem,
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but ATI Rage 128 doesn't. I think it can be fixed later. Current  code
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works very well, so maybe double buffering is not needed right now.
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    Something strange happens when you try to move the window with the
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overlay beyond the left border  of the screen. The  overlay  tries  to
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stay at position x=0, but when attempting to move it  a  bit  more  it
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jumps to position x=-60 (on GF2-MX, on ATI Rage128 this  value  a  bit
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smaller). It's really strange, looks  like  the  overlay  doesn't like
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negative coordinates.
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=======================================================================
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Shared library building:
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    A shared library can be built, but before running  the  autogen.sh
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script you must manually delete the libtool.m4 stuff from the acinclu-
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de.m4 file (it comes after the ESD detection code up to the end of the
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file), because the libtool stuff in the acinclude.m4 file is very  old
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in SDL distribution before the version 1.2.7 and doesn't know anything
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about QNX. SDL 1.2.7 distribution contain  the  new libtool.m4 script,
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but anyway  it  is  broken :), Just  remove  it, then  run "libtoolize
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--force --copy",  delete the file aclocal.m4 and after  that  run  the
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autogen.sh script.
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======================================================================
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Some building issues:
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    Feel free to not use the --disable-shared configure option if you'
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ve read the above comment about 'Shared  library  building'. Otherwise
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this  option  is  strongly  recommended, as  without it the sdl-config
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script will be broken.
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    Run the configure script without x11 support, e.g.:
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    a) for OpenGL support:
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    ./configure --prefix=/usr       \
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                --disable-video-x11 \
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                --disable-shared
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    b) without OpenGL support:
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    ./configure --prefix=/usr       \
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                --disable-video-x11 \
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                --disable-shared    \
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                --disable-video-opengl
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692
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    In the test directory also run the ./configure script without
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x11 support, e.g.:
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    ./configure  --with-sdl-prefix=/usr            \
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                 --with-sdl-exec-prefix=/usr       \
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                 --prefix=/usr --without-x
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======================================================================
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Environment variables:
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    Please note that the photon driver  is  sensible to the  following
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environmental variables:
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 * SDL_VIDEO_WINDOW_POS - can be  set in the "X,Y" format.  If X and Y
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coordinates are bigger than the current desktop resolution, then  win-
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dow positioning across  virtual  consoles is activated. If X and Y are
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smaller than the desktop resolution  then  window  positioning  in the
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current console is activated. The word "center" can be used instead of
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coordinates, it  produces  the  same  behavior  as  SDL_VIDEO_CENTERED
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environmental variable.
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 * SDL_VIDEO_CENTERED - if this environmental variable exists then the
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window centering is perfomed in the current virtual console.
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    The SDL_VIDEO_CENTERED enviromental variable has greater  priority
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than the SDL_VIDEO_WINDOW_POS in case if both variables  are  supplied
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to the application.