README.QNX by Mike Gorchak <mike@malva.ua>, <lestat@i.com.ua>

Last changed at 10 Jun 2009.

QNX Photon and GF drivers are being constructed, OpenGL ES support is

    finished.  Still no 2D renderer support in GF and Photon drivers.

QNX QSA (QNX Sound Architecture) driver is ready.

QNX HID input driver is finished.

----------------------

 -- SDL QSA driver --

----------------------

   Due to QNX Sound Architecture limitations software could  not  determine

what playback channels are designed for, so some casus can be. For example,

output after testmultiaudio test utility execution:

Using audio driver: qsa

playing on device #0: ('Vortex 8820 @ fb000000 d0')...done.

playing on device #1: ('Vortex 8820 @ fb000000 d1')...done.

playing on device #2: ('i8x0 @ d800 d0')...done.

playing on device #3: ('i8x0 @ d800 d1')...done.

playing on all devices...

Open device 3 failed: QSA: snd_pcm_channel_params failed: Invalid argument

If  speakers  are  connected  to  both  audio  cards: Vortex 8820 and Intel

Integrated Audio we can hear sound playback on device #0 and devices #2, #3

only. Device #1 is an unknown PCM channel which does not produce any sound.

As for error during device #3 opening, it's caused  by QSA  software  mixer

channel, because  it can't open real hardware device #2, since it's already

opened by SDL.

After simultaneous sound playback  on  all  devices  utility testmultiaudio

stays running waiting for  sound playback  finish  on  device #1,  which is

locked up due to some Aureal Vortex 8820 driver limitations.

---------------------

 -- SDL GF driver --

---------------------

Here is an additional information about SDL GF driver:

 * 0. Introduction.

 * 1. Environment variables which SDL GF driver supports.

 * 2. Custom video modes.

 * 3. Limitations.

0. Introduction.

   SDL GF driver is a layer between  SDL  and  QNX Graphics Framework (GF).

SDL GF driver also supports OpenGL ES  through the  QNX Graphics Framework.

Hardware accelerated features which SDL can support depend on real hardware

capabilities.

1. Environment variables which GF driver supports.

   GF  driver  supports  the  following  environment  variables for  QNX GF

specific customization options:

   a) SDL_VIDEO_GF_REFRESH_RATE - refresh  rate  of  video  output  in  Hz.

      Without this environment variable declaration  SDL  controls  refresh

      rate of your display.  If this enironment  variable is set  to 0, SDL

      will control  refresh  rate  of  display,  otherwise  value  of  flag

      SDL_VIDEO_GF_REFRESH_RATE  is  used  for  all  screen  resolutions as

      refresh rate. This example will set 60Hz refresh rate as refresh rate

      for all graphics modes:

      export SDL_VIDEO_GF_REFRESH_RATE=60

2. Custom video modes.

   Since most QNX graphics drivers support GENERIC  video  modes, i.e.  you

can specify any horizontal and vertical resolution and  any  refresh  rate,

SDL GF driver uses its own fullscreen modes list, which can be  incomplete.

You can add any custom video mode, which your QNX graphics driver  supports

by  editing  file  ./src/video/qnxgf/SDL_qnxgf.c.   Custom   graphics  mode

definition looks like this:

   {0, 1024, 640, 60, NULL},   /* 1024x640 mode is 60Hz only             */

You must specify horizontal resolution as  the  second  parameter, vertical

resolution as the third one and  refresh  rate  as  the  fourth  parameter.

Please leave the first and the last parameters as 0 and NULL.  Then send me

your changes to e-mail address which is specified in  the  header  of  this

document.

3. Limitations.

   There are few limitations while using SDL GF driver:

   a) Since  GF   driver   supports   fullscreen  modes  only,   when  flag

SDL_WINDOW_FULLSCREEN is not specified, SDL GF driver will try to find  the

fullscreen graphics mode which corresponds to SDL window size. Refresh rate

will be the  lowest  available,  if  SDL_VIDEO_GF_REFRESH_RATE  environment

variable is not set.

   b) As confirmed by QSSL none of existing video  drivers  has  support of

doublescan low-resolution video modes.  So  modes  below  640x480  are  not

supported. If your video driver supports low-resolution video modes, please

add SDL_GF_LOWRESOLUTION flag to the gf_devicename array in the SDL_qnxgf.c

source file.

   c) Since  GF  framework supports hardware mouse cursor only,  you'll get

hardware mouse cursor in case of specific graphics driver supports it.

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 -- SDL Photon driver --

-------------------------

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 -- SDL HID input driver --

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