2004-05-06 15:55:06 +00:00
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README.QNX by Mike Gorchak <mike@malva.ua>, <lestat@i.com.ua>
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2009-03-17 03:24:22 +00:00
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Last changed at 10 Mar 2009.
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2003-12-10 12:35:56 +00:00
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2009-03-03 04:21:51 +00:00
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QNX Photon and GF drivers are under construction. Please be patient.
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2009-03-17 03:24:22 +00:00
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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). Hardware
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accelerated features which SDL could support depends on real hardware 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 specific
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customization options:
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a) SDL_VIDEO_GF_REFRESH_RATE - refresh rate of video output in Hz. Without
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this environment variable declaration SDL controls refresh rate of your
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display. If this enironment variable is set to 0, SDL will control refresh
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rate of display, otherwise value of SDL_VIDEO_GF_REFRESH_RATE is used for
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all screen resolutions as refresh rate. This example will set 60Hz refresh
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rate as refresh rate 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 supports GENERIC video modes, i.e. you could
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specify any horizontal and vertical resolution and any refresh rate, SDL GF
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driver uses its own fullscreen modes list, which could be incomplete. You could
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add any custom video mode, which your QNX graphics driver supports by editing
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file ./src/video/qnxgf/SDL_qnxgf.c. Custom graphics mode definition looks like
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{0, 1024, 640, 60, NULL}, /* 1024x640 mode is 60Hz only */
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You must specify horizontal resolution as second parameter, vertical resolution
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as third parameter and refresh rate as fourth parameter. Please leave first and
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last parameters as 0 and NULL. Then please send me your changes to e-mail address
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which is specified in the header of this 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 you are not specifing
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SDL_WINDOW_FULLSCREEN flag, an SDL GF driver will try to find the fullscreen
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graphics mode which corresponds to SDL window size. Refresh rate will be the
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lowest available, if SDL_VIDEO_GF_REFRESH_RATE environment variable is not set.
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