README.QNX
author Sam Lantinga <slouken@libsdl.org>
Wed, 12 Jan 2011 15:42:26 -0800
changeset 4986 8431f59485d0
parent 3244 7c73d5b5a0d6
permissions -rw-r--r--
Renderer didn't advertise texture format SDL_PIXELFORMAT_ABGR8888
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README.QNX by Mike Gorchak <mike@malva.ua>, <lestat@i.com.ua>
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Last changed at 10 Jun 2009.
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QNX Photon and GF drivers are being constructed, OpenGL ES support is
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    finished.  Still no 2D renderer support in GF and Photon drivers.
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QNX QSA (QNX Sound Architecture) driver is ready.
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QNX HID input driver is finished.
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----------------------
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 -- SDL QSA driver --
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----------------------
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   Due to QNX Sound Architecture limitations software could  not  determine
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what playback channels are designed for, so some casus can be. For example,
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output after testmultiaudio test utility execution:
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Using audio driver: qsa
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playing on device #0: ('Vortex 8820 @ fb000000 d0')...done.
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playing on device #1: ('Vortex 8820 @ fb000000 d1')...done.
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playing on device #2: ('i8x0 @ d800 d0')...done.
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playing on device #3: ('i8x0 @ d800 d1')...done.
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playing on all devices...
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Open device 3 failed: QSA: snd_pcm_channel_params failed: Invalid argument
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If  speakers  are  connected  to  both  audio  cards: Vortex 8820 and Intel
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Integrated Audio we can hear sound playback on device #0 and devices #2, #3
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only. Device #1 is an unknown PCM channel which does not produce any sound.
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As for error during device #3 opening, it's caused  by QSA  software  mixer
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channel, because  it can't open real hardware device #2, since it's already
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opened by SDL.
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After simultaneous sound playback  on  all  devices  utility testmultiaudio
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stays running waiting for  sound playback  finish  on  device #1,  which is
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locked up due to some Aureal Vortex 8820 driver limitations.
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---------------------
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 -- SDL GF driver --
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---------------------
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Here is an additional information about SDL GF driver:
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 * 0. Introduction.
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 * 1. Environment variables which SDL GF driver supports.
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 * 2. Custom video modes.
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 * 3. Limitations.
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0. Introduction.
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   SDL GF driver is a layer between  SDL  and  QNX Graphics Framework (GF).
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SDL GF driver also supports OpenGL ES  through the  QNX Graphics Framework.
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Hardware accelerated features which SDL can support depend on real hardware
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capabilities.
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1. Environment variables which GF driver supports.
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   GF  driver  supports  the  following  environment  variables for  QNX GF
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specific customization options:
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   a) SDL_VIDEO_GF_REFRESH_RATE - refresh  rate  of  video  output  in  Hz.
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      Without this environment variable declaration  SDL  controls  refresh
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      rate of your display.  If this enironment  variable is set  to 0, SDL
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      will control  refresh  rate  of  display,  otherwise  value  of  flag
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      SDL_VIDEO_GF_REFRESH_RATE  is  used  for  all  screen  resolutions as
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      refresh rate. This example will set 60Hz refresh rate as refresh rate
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      for all graphics modes:
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      export SDL_VIDEO_GF_REFRESH_RATE=60
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2. Custom video modes.
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   Since most QNX graphics drivers support GENERIC  video  modes, i.e.  you
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can specify any horizontal and vertical resolution and  any  refresh  rate,
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SDL GF driver uses its own fullscreen modes list, which can be  incomplete.
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You can add any custom video mode, which your QNX graphics driver  supports
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by  editing  file  ./src/video/qnxgf/SDL_qnxgf.c.   Custom   graphics  mode
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definition looks like this:
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   {0, 1024, 640, 60, NULL},   /* 1024x640 mode is 60Hz only             */
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You must specify horizontal resolution as  the  second  parameter, vertical
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resolution as the third one and  refresh  rate  as  the  fourth  parameter.
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Please leave the first and the last parameters as 0 and NULL.  Then send me
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your changes to e-mail address which is specified in  the  header  of  this
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document.
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3. Limitations.
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   There are few limitations while using SDL GF driver:
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   a) Since  GF   driver   supports   fullscreen  modes  only,   when  flag
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SDL_WINDOW_FULLSCREEN is not specified, SDL GF driver will try to find  the
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fullscreen graphics mode which corresponds to SDL window size. Refresh rate
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will be the  lowest  available,  if  SDL_VIDEO_GF_REFRESH_RATE  environment
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variable is not set.
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   b) As confirmed by QSSL none of existing video  drivers  has  support of
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doublescan low-resolution video modes.  So  modes  below  640x480  are  not
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supported. If your video driver supports low-resolution video modes, please
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add SDL_GF_LOWRESOLUTION flag to the gf_devicename array in the SDL_qnxgf.c
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source file.
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   c) Since  GF  framework supports hardware mouse cursor only,  you'll get
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hardware mouse cursor in case of specific graphics driver supports it.
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-------------------------
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 -- SDL Photon driver --
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-------------------------
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----------------------------
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 -- SDL HID input driver --
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----------------------------