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Date: Mon, 10 Oct 2005 13:09:32 +0300 From: Tommi Kyntola <tommi.kyntola@ray.fi> To: sdl@libsdl.org Subject: [SDL] [RFC] get_ticks broken on linux It uses gettimeofday to calculate the timedifference. Gettimeofday returns current time which is seldom monotonous. This breaks SDL timer subsystem. (time callbacks and all that get borked when the time difference ms is suddenly ~ 2^32) I posted a message about this earlier but got no response. Some thoughts on this matter would be appreciated. (Or even an explanation for the lack of interest.) A patch below would use the posix timers that have been around since posix 93 and do provide a good source of monotonous time on linux boxes (and on few others too). The following patch is also availabe at: http://www.hut.fi/u/tkyntola/SDL-1.2.9-clockfix.patch It's against 1.2.9, but I can easily rediffit against the cvs branch is needed. cheers, Tommi Kyntola tommi.kyntola@ray.fi
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 11 Oct 2005 18:16:12 +0000
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1 =================================================================
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2 Patch version 0.9 of SDL(Simple DirectMedia Layer) for Nano-X API
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3 =================================================================
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5 Authors: Hsieh-Fu Tsai, clare@setabox.com
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6 Greg Haerr, greg@censoft.com
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8 This patch is against SDL version 1.2.4.
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9 It enhances previous patch 0.8 by providing direct framebuffer
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10 access as well as dynamic hardware pixel type support, not
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11 requiring a compile-time option setting for different framebuffer
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12 modes.
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13 Tested against Microwindows version 0.89pre9.
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15 Older Microwindows versions
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16 ===========================
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17 If running on a version older than Microwindows 0.89pre9,
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18 the following items might need to be patched in Microwindows.
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20 1. Patch src/nanox/client.c::GrClose()
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21 It fixes the client side GrClose(). In the original version,
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22 GrOpen() can only be called once. When the GrOpen() is called at
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23 the second time, the program will terminate. In order to prevent
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24 this situation, we need to insert "nxSocket = -1" after
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25 "close(nxSocket)" in GrClose(). If you do not have this problem,
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26 you may skip this step.
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28 2. Patch src/nanox/clientfb.c to return absolute x,y coordinates
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29 when using GrGetWindowFBInfo(). Copy the version 0.89pre9
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30 of src/nanox/clientfb.c to your system, or configure
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31 using --disable-nanox-direct-fb.
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32
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33 =============
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34 Quick Install
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35 =============
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37 1. ./configure --disable-video-x11 --disable-video-fbcon \
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38 --enable-video-nanox \
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39 --with-nanox-pixel-type=[rgb/0888/888/565/555/332/pal]
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40 2. make clean
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41 3. make
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42 4. make install (as root)
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43
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44 ============
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45 Nitty-gritty
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46 ============
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48 --enable-nanox-direct-fb Use direct framebuffer access
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49 --enable-nanox-debug Show debug messages
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50 --enable-nanox-share-memory Use shared-memory to speed up
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52 When running multi-threaded applications using SDL, such
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53 as SMPEG, set THREADSAFE=Y in Microwindows' config file,
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54 to enable GrXXX() system call critical section support.
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55
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56 =============================================
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57 Some programs can be used to test this patch.
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58 =============================================
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59
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60 1. http://www.cs.berkeley.edu/~weimer/atris (a tetris-like game)
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61 2. http://www.libsdl.org/projects/newvox/
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62 3. http://www.libsdl.org/projects/xflame/
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63 4. http://www.libsdl.org/projects/optimum/
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64 5. http://www.gnugeneration.com/software/loop/
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65 6: http://www.lokigames.com/development/smpeg.php3 (SMPEG version 0.4.4)
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66
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67 =========
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68 Todo List
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69 =========
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70
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71 1. Create hardware surface
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72 2. Create YUVOverlay on hardware
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73 3. Use OpenGL
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74 4. Gamma correction
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75 5. Hide/Change mouse pointer
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76 6. Better window movement control with direct fb access
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77 7. Palette handling in 8bpp could be improved
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79 =====================
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80 Supporting Institutes
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81 =====================
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82
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83 Many thanks to go to Setabox Co., Ltd. and CML (Communication and
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84 Multimedia Laboratory, http://www.cmlab.csie.ntu.edu.tw/) in the
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85 Department of Computer Science and Information Engineering of
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86 National Taiwan University for supporting this porting project.
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87
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88 Century Embedded Technologies (http://embedded.censoft.com)
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89 for this patch.
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90
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91 ===================
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92 Contact Information
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93 ===================
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94
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95 Welcome to give me any suggestion and to report bugs.
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96 My e-mail address : clare@setabox.com or niky@cmlab.csie.ntu.edu.tw
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97 or greg@censoft.com