README.QNX
author Sam Lantinga <slouken@libsdl.org>
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Date: Mon, 23 Feb 2004 19:00:23 +0100 From: "Juergen \"George\" Sawinski" Subject: Problems compiling libsdl with gcc 3.3 I attached another patch (configure.in.patch) that might resolv issues for some ppl finding the correct place of libartsc.so.*. (here, the output of "artsc-config --libs" contains two "-L.*", therefore the respecting arts_lib_spec contains the wrong path).
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README by Mike Gorchak <mike@malva.ua>, <lestat@i.com.ua>
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Last changed at 14 Feb 2004.
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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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1. 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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2. 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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3. 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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4. 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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5. 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 was very old
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in SDL distribution before the version 1.2.7 and doesn't knew 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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6. 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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    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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7. 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_PHOTON_FULLSCREEN_REFRESH - this environment variable controls
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the refresh rate in all fullscreen modes. Be carefull !!! Photon drivers
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usually do not checking the maximum refresh rate, which video adapter or
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monitor supports.
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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.