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author Sam Lantinga <slouken@libsdl.org>
date Fri, 13 Feb 2004 18:01:22 +0000
parents b14fdadd8311
children 30168104389f
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1 README by Mike Gorchak <mike@malva.ua>, <lestat@i.com.ua>
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2 Last changed at 30 Sep 2003.
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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 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 the public CD, available with QNX. OS versions
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23 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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36 ======================================================================
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37 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/+ (1 wheel)
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48 2. A4Tech Optical GreatEye WheelMouse, model: WOP-35. (2 wheels + 2
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49 additional buttons). The wheel for vertical scrolling works as usu-
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50 al, but the second wheel for horizontal scrolling emits two sequen-
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51 tial events up or down, so it can provide faster scrolling than the
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52 first wheel. Additional buttons don't emit any events, but it looks
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53 like they're handled by photon in an unusual way - like click to
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54 front, but works not with any window, looks like bug-o-feature :).
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55
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56 ======================================================================
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57 CDROM handling issues:
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58
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59 Access to CDROM can only be provided with 'root' privileges. I
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60 can't do anything about that, /dev/cd0 has brw------- permissions and
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61 root:root rights.
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62
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63 ======================================================================
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64 Hardware video overlays:
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65
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66 Overlays can flicker during window movement, resizing, etc. It
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67 happens because the photon driver updates the real window contents be-
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68 hind the overlay, then draws the temporary chroma key color over the
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69 window contents. It can be done without using the chroma key but that
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70 causes the overlay to always be on top. So flickering during window
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71 movement is preferred instead.
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72 Double buffering code is temporarily disabled in the photon driver
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73 code, because on my GF2-MX it can accidentally cause a buffer switch,
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74 which causes the old frame to show. S3 Savage4 has the same problem,
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75 but ATI Rage 128 doesn't. I think it can be fixed later. Current code
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76 works very well, so maybe double buffering is not needed right now.
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77 Something strange happens when you try to move the window with the
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78 overlay beyond the left border of the screen. The overlay tries to
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79 stay at position x=0, but when attempting to move it a bit more it
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80 jumps to position x=-60 (on GF2-MX, on ATI Rage128 this value a bit
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81 smaller). It's really strange, looks like the overlay doesn't like
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82 negative coordinates.
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83
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84 =======================================================================
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85 Shared library building:
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86
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87 A shared library can be built, but before running the autogen.sh
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88 script you must manually delete the libtool.m4 stuff from the acinclu-
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89 de.m4 file (it comes after the ESD detection code up to the end of the
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90 file), because the libtool stuff in the acinclude.m4 file is very old
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91 in SDL distribution before the version 1.2.7 and doesn't know anything
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92 about QNX. SDL 1.2.7 distribution contain the new libtool.m4 script,
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93 but anyway it is broken :), Just remove it, then run "libtoolize
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94 --force --copy", delete the file aclocal.m4 and after that run the
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95 autogen.sh script.
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96
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97 ======================================================================
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98 Some building issues:
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99
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100 Feel free to not use the --disable-shared configure option if you'
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101 ve read the above comment about 'Shared library building'. Otherwise
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102 this option is strongly recommended, as without it the sdl-config
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103 script will be broken.
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104
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105 Run the configure script without x11 support, e.g.:
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106
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107 a) for OpenGL support:
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108 ./configure --prefix=/usr \
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109 --disable-video-x11 \
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110 --disable-shared
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111
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112 b) without OpenGL support:
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113 ./configure --prefix=/usr \
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114 --disable-video-x11 \
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115 --disable-shared \
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116 --disable-video-opengl
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117
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118 In the test directory also run the ./configure script without
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119 x11 support, e.g.:
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120
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121 ./configure --with-sdl-prefix=/usr \
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122 --with-sdl-exec-prefix=/usr \
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123 --prefix=/usr --without-x
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124
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125 ======================================================================
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126 Environment variables:
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127
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128 Please note that the photon driver is sensible to the following
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129 environmental variables:
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130
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131 * SDL_VIDEO_WINDOW_POS - can be set in the "X,Y" format. If X and Y
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132 coordinates are bigger than the current desktop resolution, then win-
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133 dow positioning across virtual consoles is activated. If X and Y are
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134 smaller than the desktop resolution then window positioning in the
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135 current console is activated. The word "center" can be used instead of
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136 coordinates, it produces the same behavior as SDL_VIDEO_CENTERED
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137 environmental variable.
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138
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139 * SDL_VIDEO_CENTERED - if this environmental variable exists then the
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140 window centering is perfomed in the current virtual console.
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141
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142 The SDL_VIDEO_CENTERED enviromental variable has greater priority
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143 than the SDL_VIDEO_WINDOW_POS in case if both variables are supplied
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144 to the application.