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Date: Wed, 5 Nov 2003 21:27:47 +0100 From: Thomas Jarosch <xxx> To: Ryan C. Gordon <xxx> Subject: MGA CRTC2 update Hi Ryan, attached is a small update for the DirectFB MGA CRTC2 support: - Video aspect ratio correct scaling (important for MAME) - Small bugfix in previous scaling code - Ability to control the TV picture overscan via the environment variable SDL_DIRECTFB_OVERSCAN. Sounds worth enough for applying it to SDL CVS ;-) Cheers, Thomas
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 05 Nov 2003 21:07:29 +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 12 Aug 2003.
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3
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4 ======================================================================
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5 OpenGL:
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7 OpenGL works well and is stable, but fullscreen mode has not been
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8 heavily tested yet.
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9 If you have QNX RtP version 6.1.0 or above you must download the
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10 Photon3D runtime from http://developers.qnx.com or install it from the
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11 public repository or the public CD, available with QNX. OS versions
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12 below 6.1.0 are not supported.
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13 When creating an OpenGL context, software renderer mode is artifi-
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14 cially selected (QSSL made acceleration only for Voodoo boards in
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15 fullscreen mode, sorry but I don't have this board to test OpenGL -
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16 maybe it works or maybe not :)). If you want acceleration - you can
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17 remove one line in the source code: find the file SDL_ph_video.c and
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18 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 the argument to
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23 PHOGL_ATTRIB_FORCE_HW or PHOGL_ATTRIB_FAVOR_HW.
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25 ======================================================================
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26 Wheel and multi-button mouses:
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27
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28 Photon emits keyboard events (key up and down) when the mouse
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29 wheel is moved. The key_scan field appears valid, and it contains zero.
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30 That is a basic method of detecting mouse wheel events under Photon.
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31 It looks like a hack, but it works for me :) on various PC configura-
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32 tions.
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33
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34 I've 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 + 2
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38 additional buttons). The wheel for vertical scrolling works as usu-
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39 al, but the second wheel for horizontal scrolling emits two sequen-
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40 tial events up or down, so it can provide faster scrolling than the
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41 first wheel. Additional buttons don't emit any events, but it looks
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42 like they're handled by photon in an unusual way - like click to
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43 front, but works not with any window, looks like bug-o-feature :).
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45 ======================================================================
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46 CDROM handling issues:
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47
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48 Access to CDROM can only be provided with 'root' privileges. I
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49 can't do anything about that, /dev/cd0 has brw------- permissions and
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50 root:root rights.
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51
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52 ======================================================================
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53 Video Overlays:
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54
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55 Overlays can flicker during window movement, resizing, etc. It
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56 happens because the photon driver updates the real window contents be-
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57 hind the overlay, then draws the temporary chroma key color over the
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58 window contents. It can be done without using the chroma key but that
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59 causes the overlay to always be on top. So flickering during window
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60 movement is preferred instead.
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61 Double buffering code is temporarily disabled in the photon driver
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62 code, because on my GF2-MX it can accidentally cause a buffer switch,
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63 which causes the old frame to show. S3 Savage4 has the same problem,
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64 but ATI Rage 128 doesn't. I think it can be fixed later. Current code
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65 works very well, so maybe double buffering is not needed right now.
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66 Something strange happens when you try to move the window with the
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67 overlay beyond the left border of the screen. The overlay tries to
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68 stay at position x=0, but when attempting to move it a bit more it
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69 jumps to position x=-60 (on GF2-MX, on ATI Rage128 this value a bit
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70 smaller). It's really strange, looks like the overlay doesn't like
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71 negative coordinates.
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73 =======================================================================
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74 Shared library building:
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75
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76 A shared library can be built, but before running the autogen.sh
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77 script you must manually delete the libtool.m4 stuff from the acinclu-
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78 de.m4 file (it comes after the ESD detection code up to the end of the
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79 file), because the libtool stuff in the acinclude.m4 file is very old
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80 and doesn't know anything about QNX. Just remove it, then run
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81 "libtoolize --force --copy" and after that run the autogen.sh script.
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83 ======================================================================
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84 Some building issues:
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85
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86 Feel free to not use the --disable-shared configure option if you'
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87 ve read the above comment about 'Shared library building'. Otherwise
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88 this option is strongly recommended, as without it the sdl-config
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89 script will be broken.
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90
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91 Run the configure script without x11 support, e.g.:
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92
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93 a) for OpenGL support:
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94 ./configure --prefix=/usr \
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95 --disable-video-x11 \
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96 --disable-shared
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97
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98 b) without OpenGL support:
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99 ./configure --prefix=/usr \
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100 --disable-video-x11 \
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101 --disable-shared \
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102 --disable-video-opengl
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104 In the test directory also run the ./configure script without
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105 x11 support, e.g.:
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107 ./configure --with-sdl-prefix=/usr \
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108 --with-sdl-exec-prefix=/usr \
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109 --prefix=/usr --without-x