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Editors Note: The original patch was modified to use SDL_Delay() instead of nanosleep because nanosleep may not be portable to all systems using SDL with the ALSA backend. This may be a moot point with the switch to blocking writes anyway... Date: Sat, 27 Dec 2003 21:47:36 +0100 From: Michel Daenzer To: Debian Bug Tracking System Subject: [SDL] Bug#225252: [PATCH] ALSA fixes Package: libsdl1.2debian-all Version: 1.2.6-2 Severity: normal Tags: patch For SDL 1.2.6, the ALSA backend was changed to call snd_pcm_open() with SND_PCM_NONBLOCK. That's a good idea per se, however, it causes high CPU usage, interrupted sound and stuttering in some games here. Taking a nanosleep whenever snd_pcm_writei() returns -EAGAIN fixes this, but I think it's more efficient to use blocking mode for the actual sound playback. Feedback from the SDL and ALSA lists appreciated. The patch also fixes the default ALSA device to be used.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2004 15:40:50 +0000
parents b14fdadd8311
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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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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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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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63 ======================================================================
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64 Hardware video overlays:
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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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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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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
753
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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.