| 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. |
| |
| ------------------------- |
| -- SDL Photon driver -- |
| ------------------------- |
| |
| ---------------------------- |
| -- SDL HID input driver -- |
| ---------------------------- |
