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Date: Tue, 12 Aug 2003 14:26:19 +0200 (MEST) From: "Mattias Engdeg?rd" Subject: bug in SDL_GetRGB/GetRGBA There's an embarrassing bug in GetRGB/GetRGBA which apparently has been there for years. It incorrectly converts colours with < 8 bits/channel. It came to my attention today in #sdl. What it does now is (for each channel): rv = (pixel & fmt->Rmask) >> fmt->Rshift; *r = (rv << fmt->Rloss) + (rv >> (8 - fmt->Rloss)); which is wrong; the last line should be *r = (rv << fmt->Rloss) + (rv >> (8 - (fmt->Rloss << 1)));
author Sam Lantinga <slouken@libsdl.org>
date Tue, 12 Aug 2003 15:17:20 +0000
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1 README by Mike Gorchak <mike@malva.ua>, <lestat@i.com.ua>
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2 Last changed at 29 Jul 2003.
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3
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4 =========================================================================
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5 OpenGL:
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6
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7 OpenGL in window mode works well and stable, in fullscreen
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8 mode too, but fullscreen mode has not been heavily tested yet.
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9 If you have QNX RtP version 6.1.0 and above you must download
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10 new Photon3D runtime from http://developers.qnx.com or install it
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11 from public repository or from public CD, available with QNX. The
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12 versions of OS before 6.1.0 are not supported.
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13 While creating OpenGL context software renderer mode is
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14 artificially selected (QSSL made acceleration only for Voodoo
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15 boards in fullscreen mode, sorry but I don't have this board to
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16 test OpenGL - maybe it work or maybe not :)). If you want accele-
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17 ration - you may remove some line in source code: find the file
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18 SDL_ph_video.c and remove the following
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19
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20 OGLAttrib[OGLargc++]=PHOGL_ATTRIB_FORCE_SW;
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21
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22 line in the ph_SetupOpenGLContext() function or change argument
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23 to the PHOGL_ATTRIB_FORCE_HW or PHOGL_ATTRIB_FAVOR_HW.
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24
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25 =========================================================================
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26 Wheel and multibutton mouses:
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27
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28 Photon emitting keyboard events (key up and down) when moved
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29 mouse wheel. But key_scan field appears valid according to flags,
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30 and it contain zero. It is base method of detecting mouse wheel
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31 events under photon. It looks like a hack, but it works for me :)
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32 on different PC configurations.
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33
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34 I'm tested it on:
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35
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36 1. Genius Optical NetScroll/+ (1 wheel)
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37 2. A4Tech Optical GreatEye WheelMouse, model: WOP-35. (2 wheels +
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38 2 additional buttons). Wheel for vertical scrolling works as
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39 usual, but second wheel for horizontal scrolling emitting two
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40 consequented events up or down, so it can provide more fast
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41 scrolling then the first wheel. Additional buttons doesn't
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42 emitting any events, but its look like handled by photon in
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43 unusual way - like click to front, but works not with any win-
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44 dow, looks like bug-o-feature :).
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45
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46 =========================================================================
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47 CDROM handling issues:
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48
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49 Access to CDROM can be provided only with 'root' previleges.
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50 I can't do anything with this fact. /dev/cd0 have the brw-------
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51 flags and root:root rights.
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52
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53 =========================================================================
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54 Video Overlays:
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55
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56 Overlays can flickering during the window movement, resizing,
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57 etc. It happens because photon driver updates the real window
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58 contents behind the overlay, then draws the temporary chroma key
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59 color over window contents. It can be done without the chroma key
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60 using but it cause overlay will be always on top. So flickering
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61 during the movement much better in that case.
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62 Double buffering code temporary disabled in the photon driver
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63 code, beacuse on my GF2-MX it cause accidently buffer switch,
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64 which going to the old frame showing. S3 Savage3D have the same
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65 problem, but ATI Rage 128 has not this problem. I think it can be
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66 fixed later. Current code works very fine, so maybe double buffe-
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67 ring is not needed right now.
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68 Something strange appears when you tried to move window with
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69 overlay beyond the left border of the screen. Overlay trying to
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70 stay at position x=0, but when tried to move it a bit more it
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71 jumps at posituin x=-60. Really strange, looks like overlay
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72 doesn't love the negotive coordinates.
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73
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74 =========================================================================
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75 Shared library building:
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76
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77 Shared library can be built, but before running autogen.sh
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78 script you need manually delete the libtool m4 stuff from
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79 the acinclude.m4 file (it comes after ESD detection code up to
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80 end of the file). Because libtool stuff in the acinclude.m4 file
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81 very old and doesn't know anything about the QNX. Just remove it
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82 and run autogen.sh script.
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83
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84 =========================================================================
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85 Some building issues:
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86
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87 Feel free to not pass --disable-shared option to configure,
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88 if you read comment above about 'Shared library building'. Other-
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89 wise this option is strongly recomended, because the sdl-config
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90 script will be unfunctional.
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91
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92 Run configure script without x11 support, e.g.:
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93
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94 a) for OpenGL support:
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95 ./configure --prefix=/usr/local \
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96 --disable-video-x11 \
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97 --disable-shared
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98
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99 b) without OpenGL support:
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100 ./configure --prefix=/usr/local \
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101 --disable-video-x11 \
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102 --disable-shared \
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103 --disable-video-opengl
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104
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105 In test directory also run ./configure script without x11
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106 support, e.g.:
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108 ./configure --with-sdl-prefix=/usr/local \
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109 --with-sdl-exec-prefix=/usr/local \
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110 --prefix=/usr/local --without-x
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