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annotate README.QNX @ 2938:2929ed239d2a

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Adjusted default choice of audio driver. If a driver can definitely see available devices, it is chosen. Otherwise, we'll take the first driver that initializes but saw no devices...this might be because it can't enumerate them, or there really aren't any available. This prevents the dsp driver from hogging control when there are no /dev/dsp* nodes (for example, on a Linux box with ALSA and no OSS emulation).
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 01 Jan 2009 07:54:58 +0000
parents 05c551e5bc64
children 0bc41e0361d3
rev   line source
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1 README.QNX by Mike Gorchak <mike@malva.ua>, <lestat@i.com.ua>
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2 Last changed at 24 Apr 2004.
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3
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4 ======================================================================
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5 Table of Contents:
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6
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7 1. OpenGL.
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8 2. Wheel and multi-button mouses.
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9 3. CDROM handling issues.
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10 4. Hardware video overlays.
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11 5. Shared library building.
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12 6. Some building issues.
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13 7. Environment variables.
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15 ======================================================================
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16 1. OpenGL:
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17
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18 OpenGL works well and is stable, but fullscreen mode has not been
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19 heavily tested yet.
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20 If you have QNX RtP version 6.1.0 or above you must download the
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21 Photon3D runtime from http://developers.qnx.com or install it from the
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22 public repository or from the public CD, available with QNX. OS versi-
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23 ons below 6.1.0 are not supported.
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24 When creating an OpenGL context, software renderer mode is artifi-
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25 cially selected (QSSL made acceleration only for Voodoo boards in
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26 fullscreen mode, sorry but I don't have this board to test OpenGL -
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27 maybe it works or maybe not :)). If you want acceleration - you can
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28 remove one line in the source code: find the file SDL_ph_image.c and
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29 remove the following
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30
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31 OGLAttrib[OGLargc++]=PHOGL_ATTRIB_FORCE_SW;
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32
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33 line in the ph_SetupOpenGLContext() function or change the argument to
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34 PHOGL_ATTRIB_FORCE_HW or PHOGL_ATTRIB_FAVOR_HW.
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35
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36 ======================================================================
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37 2. Wheel and multi-button mouses:
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38
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39 Photon emits keyboard events (key up and down) when the mouse
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40 wheel is moved. The key_scan field appears valid, and it contains zero.
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41 That is a basic method of detecting mouse wheel events under Photon.
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42 It looks like a hack, but it works for me :) on various PC configura-
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43 tions.
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44
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45 I've tested it on:
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46
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47 1. Genius Optical NetScroll/+ PS/2 (1 wheel)
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48 2. A4Tech Optical GreatEye WheelMouse PS/2, model: WOP-35. (2 wheels
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49 + 2 additional buttons). The wheel for vertical scrolling works as
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50 usual, but the second wheel for horizontal scrolling emits two se-
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51 quential events up or down, so it can provide faster scrolling than
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52 the first wheel. Additional buttons don't emit any events, but it
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53 looks like they're handled by photon in an unusual way - like click
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54 to front, but works not with any window, looks like a fun bug-o-fe-
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55 ature :).
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56
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57 ======================================================================
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58 3. CDROM handling issues:
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59
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60 Access to CDROM can only be provided with 'root' privileges. I
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61 can't do anything about that, /dev/cd0 has brw------- permissions and
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62 root:root rights.
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63
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64 ======================================================================
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65 4. Hardware video overlays:
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66
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67 Overlays can flicker during window movement, resizing, etc. It
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68 happens because the photon driver updates the real window contents be-
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69 hind the overlay, then draws the temporary chroma key color over the
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70 window contents. It can be done without using the chroma key but that
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71 causes the overlay to always be on top. So flickering during window
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72 movement is preferred instead.
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73 Double buffering code is temporarily disabled in the photon driver
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74 code, because on my GF2-MX it can accidentally cause a buffer switch,
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75 which causes the old frame to show. S3 Savage4 has the same problem,
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76 but ATI Rage 128 doesn't. I think it can be fixed later. Current code
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77 works very well, so maybe double buffering is not needed right now.
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78 Something strange happens when you try to move the window with the
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79 overlay beyond the left border of the screen. The overlay tries to
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80 stay at position x=0, but when attempting to move it a bit more it
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81 jumps to position x=-60 (on GF2-MX, on ATI Rage128 this value a bit
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82 smaller). It's really strange, looks like the overlay doesn't like
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83 negative coordinates.
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84
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85 =======================================================================
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86 5. Shared library building:
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87
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88 A shared library can be built, but before running the autogen.sh
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89 script you must manually delete the libtool.m4 stuff from the acinclu-
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90 de.m4 file (it comes after the ESD detection code up to the end of the
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91 file), because the libtool stuff in the acinclude.m4 file was very old
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92 in SDL distribution before the version 1.2.7 and doesn't knew anything
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93 about QNX. SDL 1.2.7 distribution contains the new libtool.m4 script,
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94 but anyway it is broken :), Just remove it, then run "libtoolize
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95 --force --copy", delete the file aclocal.m4 if it is exists and after
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96 that run the autogen.sh script. SDL 1.2.8 contains fixed libtool.m4,
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97 ltmain.sh and config.sub files, so you can just run the autogen.sh
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98 script.
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100 ======================================================================
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101 6. Some building issues:
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102
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103 Feel free to not use the --disable-shared configure option if you'
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104 ve read the above comment about 'Shared library building'. Otherwise
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105 this option is strongly recommended, as without it the sdl-config
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106 script will be broken.
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107
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108 Run the configure script without x11 support, e.g.:
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109
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110 a) for OpenGL support:
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111 ./configure --prefix=/usr \
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112 --disable-video-x11 \
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113 --disable-shared
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114
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115 b) without OpenGL support:
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116 ./configure --prefix=/usr \
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117 --disable-video-x11 \
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118 --disable-shared \
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119 --disable-video-opengl
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120
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121 And of course dont forget to specify --disable-debug, which is on
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122 by default, to disable debug and enable the expensive optimizations.
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123
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124 In the test directory also run the ./configure script without
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125 x11 support, e.g.:
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c6abdda2f666 Added QNX cleanups by Mike Gorchak (thanks!)
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126
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127 ./configure --with-sdl-prefix=/usr \
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128 --with-sdl-exec-prefix=/usr \
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129 --prefix=/usr --without-x
753
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130
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131 ======================================================================
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132 7. Environment variables:
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133
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134 Please note that the photon driver is sensible to the following
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135 environmental variables:
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136
886
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137 * SDL_PHOTON_FULLSCREEN_REFRESH - this environment variable controls
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138 the refresh rate in all fullscreen modes. Be carefull !!! Photon
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139 drivers usually do not checking the maximum refresh rate, which video
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140 adapter or monitor supports.
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141
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142 * SDL_VIDEO_WINDOW_POS - can be set in the "X,Y" format. If X and Y
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143 coordinates are bigger than the current desktop resolution, then win-
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144 dow positioning across virtual consoles is activated. If X and Y are
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145 smaller than the desktop resolution then window positioning in the
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146 current console is activated. The word "center" can be used instead of
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147 coordinates, it produces the same behavior as SDL_VIDEO_CENTERED
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148 environmental variable.
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149
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150 * SDL_VIDEO_CENTERED - if this environmental variable exists then the
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151 window centering is perfomed in the current virtual console.
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152
886
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153 Notes: The SDL_VIDEO_CENTERED enviromental variable has greater pri-
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154 ority than the SDL_VIDEO_WINDOW_POS in case if both variables are sup-
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155 plied to the application.