author | Sam Lantinga <slouken@libsdl.org> |
Sat, 05 Sep 2009 09:12:03 +0000 | |
changeset 3244 | 7c73d5b5a0d6 |
parent 3192 | ec126b077b96 |
permissions | -rw-r--r-- |
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Date: Sat, 24 Apr 2004 15:13:32 +0300
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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 -- |
82e60908fab1
Date: Mon, 23 Mar 2009 09:17:24 +0200
Sam Lantinga <slouken@libsdl.org>
parents:
3092
diff
changeset
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108 |
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