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Date: Mon, 2 Mar 2009 16:27:42 +0200 From: "Mike Gorchak" Subject: About QNX support in SDL 1.3 Right now I'm working on QNX SDL 1.3 drivers implementation and looks like a lot of code must be completely reworked. But I'm ready for it :) Also I want to add QNX Graphics Framework SDL driver, which is fullscreen graphics framework, with support of hardware accelerated OpenGL ES implementations. This Graphics Framework (called GF in QNX) could also use QNX Photon (window manager GUI) as window manager. In the attachment initial patch for QNX support in SDL 1.3
author Sam Lantinga <slouken@libsdl.org>
date Tue, 03 Mar 2009 04:21:51 +0000
parents 05c551e5bc64
children cad1aefa2ed9
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1 README.QNX by Mike Gorchak <mike@malva.ua>, <lestat@i.com.ua> 1 README.QNX by Mike Gorchak <mike@malva.ua>, <lestat@i.com.ua>
2 Last changed at 24 Apr 2004. 2 Last changed at 02 Mar 2009.
3 3
4 ====================================================================== 4 QNX Photon and GF drivers are under construction. Please be patient.
5 Table of Contents:
6
7 1. OpenGL.
8 2. Wheel and multi-button mouses.
9 3. CDROM handling issues.
10 4. Hardware video overlays.
11 5. Shared library building.
12 6. Some building issues.
13 7. Environment variables.
14
15 ======================================================================
16 1. OpenGL:
17
18 OpenGL works well and is stable, but fullscreen mode has not been
19 heavily tested yet.
20 If you have QNX RtP version 6.1.0 or above you must download the
21 Photon3D runtime from http://developers.qnx.com or install it from the
22 public repository or from the public CD, available with QNX. OS versi-
23 ons below 6.1.0 are not supported.
24 When creating an OpenGL context, software renderer mode is artifi-
25 cially selected (QSSL made acceleration only for Voodoo boards in
26 fullscreen mode, sorry but I don't have this board to test OpenGL -
27 maybe it works or maybe not :)). If you want acceleration - you can
28 remove one line in the source code: find the file SDL_ph_image.c and
29 remove the following
30
31 OGLAttrib[OGLargc++]=PHOGL_ATTRIB_FORCE_SW;
32
33 line in the ph_SetupOpenGLContext() function or change the argument to
34 PHOGL_ATTRIB_FORCE_HW or PHOGL_ATTRIB_FAVOR_HW.
35
36 ======================================================================
37 2. Wheel and multi-button mouses:
38
39 Photon emits keyboard events (key up and down) when the mouse
40 wheel is moved. The key_scan field appears valid, and it contains zero.
41 That is a basic method of detecting mouse wheel events under Photon.
42 It looks like a hack, but it works for me :) on various PC configura-
43 tions.
44
45 I've tested it on:
46
47 1. Genius Optical NetScroll/+ PS/2 (1 wheel)
48 2. A4Tech Optical GreatEye WheelMouse PS/2, model: WOP-35. (2 wheels
49 + 2 additional buttons). The wheel for vertical scrolling works as
50 usual, but the second wheel for horizontal scrolling emits two se-
51 quential events up or down, so it can provide faster scrolling than
52 the first wheel. Additional buttons don't emit any events, but it
53 looks like they're handled by photon in an unusual way - like click
54 to front, but works not with any window, looks like a fun bug-o-fe-
55 ature :).
56
57 ======================================================================
58 3. CDROM handling issues:
59
60 Access to CDROM can only be provided with 'root' privileges. I
61 can't do anything about that, /dev/cd0 has brw------- permissions and
62 root:root rights.
63
64 ======================================================================
65 4. Hardware video overlays:
66
67 Overlays can flicker during window movement, resizing, etc. It
68 happens because the photon driver updates the real window contents be-
69 hind the overlay, then draws the temporary chroma key color over the
70 window contents. It can be done without using the chroma key but that
71 causes the overlay to always be on top. So flickering during window
72 movement is preferred instead.
73 Double buffering code is temporarily disabled in the photon driver
74 code, because on my GF2-MX it can accidentally cause a buffer switch,
75 which causes the old frame to show. S3 Savage4 has the same problem,
76 but ATI Rage 128 doesn't. I think it can be fixed later. Current code
77 works very well, so maybe double buffering is not needed right now.
78 Something strange happens when you try to move the window with the
79 overlay beyond the left border of the screen. The overlay tries to
80 stay at position x=0, but when attempting to move it a bit more it
81 jumps to position x=-60 (on GF2-MX, on ATI Rage128 this value a bit
82 smaller). It's really strange, looks like the overlay doesn't like
83 negative coordinates.
84
85 =======================================================================
86 5. Shared library building:
87
88 A shared library can be built, but before running the autogen.sh
89 script you must manually delete the libtool.m4 stuff from the acinclu-
90 de.m4 file (it comes after the ESD detection code up to the end of the
91 file), because the libtool stuff in the acinclude.m4 file was very old
92 in SDL distribution before the version 1.2.7 and doesn't knew anything
93 about QNX. SDL 1.2.7 distribution contains the new libtool.m4 script,
94 but anyway it is broken :), Just remove it, then run "libtoolize
95 --force --copy", delete the file aclocal.m4 if it is exists and after
96 that run the autogen.sh script. SDL 1.2.8 contains fixed libtool.m4,
97 ltmain.sh and config.sub files, so you can just run the autogen.sh
98 script.
99
100 ======================================================================
101 6. Some building issues:
102
103 Feel free to not use the --disable-shared configure option if you'
104 ve read the above comment about 'Shared library building'. Otherwise
105 this option is strongly recommended, as without it the sdl-config
106 script will be broken.
107
108 Run the configure script without x11 support, e.g.:
109
110 a) for OpenGL support:
111 ./configure --prefix=/usr \
112 --disable-video-x11 \
113 --disable-shared
114
115 b) without OpenGL support:
116 ./configure --prefix=/usr \
117 --disable-video-x11 \
118 --disable-shared \
119 --disable-video-opengl
120
121 And of course dont forget to specify --disable-debug, which is on
122 by default, to disable debug and enable the expensive optimizations.
123
124 In the test directory also run the ./configure script without
125 x11 support, e.g.:
126
127 ./configure --with-sdl-prefix=/usr \
128 --with-sdl-exec-prefix=/usr \
129 --prefix=/usr --without-x
130
131 ======================================================================
132 7. Environment variables:
133
134 Please note that the photon driver is sensible to the following
135 environmental variables:
136
137 * SDL_PHOTON_FULLSCREEN_REFRESH - this environment variable controls
138 the refresh rate in all fullscreen modes. Be carefull !!! Photon
139 drivers usually do not checking the maximum refresh rate, which video
140 adapter or monitor supports.
141
142 * SDL_VIDEO_WINDOW_POS - can be set in the "X,Y" format. If X and Y
143 coordinates are bigger than the current desktop resolution, then win-
144 dow positioning across virtual consoles is activated. If X and Y are
145 smaller than the desktop resolution then window positioning in the
146 current console is activated. The word "center" can be used instead of
147 coordinates, it produces the same behavior as SDL_VIDEO_CENTERED
148 environmental variable.
149
150 * SDL_VIDEO_CENTERED - if this environmental variable exists then the
151 window centering is perfomed in the current virtual console.
152
153 Notes: The SDL_VIDEO_CENTERED enviromental variable has greater pri-
154 ority than the SDL_VIDEO_WINDOW_POS in case if both variables are sup-
155 plied to the application.