author | Sam Lantinga <slouken@libsdl.org> |
Tue, 24 Feb 2004 19:22:22 +0000 | |
changeset 856 | d3165b90ee42 |
parent 821 | 30168104389f |
child 886 | 05c551e5bc64 |
permissions | -rw-r--r-- |
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README by Mike Gorchak <mike@malva.ua>, <lestat@i.com.ua> |
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Last changed at 14 Feb 2004. |
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====================================================================== |
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Table of Contents: |
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1. OpenGL. |
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2. Wheel and multi-button mouses. |
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3. CDROM handling issues. |
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4. Hardware video overlays. |
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5. Shared library building. |
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6. Some building issues. |
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7. Environment variables. |
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====================================================================== |
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1. OpenGL: |
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OpenGL works well and is stable, but fullscreen mode has not been |
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heavily tested yet. |
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If you have QNX RtP version 6.1.0 or above you must download the |
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Photon3D runtime from http://developers.qnx.com or install it from the |
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public repository or the public CD, available with QNX. OS versions |
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below 6.1.0 are not supported. |
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When creating an OpenGL context, software renderer mode is artifi- |
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cially selected (QSSL made acceleration only for Voodoo boards in |
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fullscreen mode, sorry but I don't have this board to test OpenGL - |
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maybe it works or maybe not :)). If you want acceleration - you can |
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remove one line in the source code: find the file SDL_ph_image.c and |
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remove the following |
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OGLAttrib[OGLargc++]=PHOGL_ATTRIB_FORCE_SW; |
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line in the ph_SetupOpenGLContext() function or change the argument to |
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PHOGL_ATTRIB_FORCE_HW or PHOGL_ATTRIB_FAVOR_HW. |
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====================================================================== |
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2. Wheel and multi-button mouses: |
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Photon emits keyboard events (key up and down) when the mouse |
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wheel is moved. The key_scan field appears valid, and it contains zero. |
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That is a basic method of detecting mouse wheel events under Photon. |
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It looks like a hack, but it works for me :) on various PC configura- |
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tions. |
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I've tested it on: |
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1. Genius Optical NetScroll/+ (1 wheel) |
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2. A4Tech Optical GreatEye WheelMouse, model: WOP-35. (2 wheels + 2 |
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additional buttons). The wheel for vertical scrolling works as usu- |
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al, but the second wheel for horizontal scrolling emits two sequen- |
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tial events up or down, so it can provide faster scrolling than the |
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first wheel. Additional buttons don't emit any events, but it looks |
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like they're handled by photon in an unusual way - like click to |
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front, but works not with any window, looks like bug-o-feature :). |
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====================================================================== |
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3. CDROM handling issues: |
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Access to CDROM can only be provided with 'root' privileges. I |
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can't do anything about that, /dev/cd0 has brw------- permissions and |
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root:root rights. |
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====================================================================== |
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4. Hardware video overlays: |
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Overlays can flicker during window movement, resizing, etc. It |
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happens because the photon driver updates the real window contents be- |
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hind the overlay, then draws the temporary chroma key color over the |
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window contents. It can be done without using the chroma key but that |
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causes the overlay to always be on top. So flickering during window |
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movement is preferred instead. |
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Double buffering code is temporarily disabled in the photon driver |
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code, because on my GF2-MX it can accidentally cause a buffer switch, |
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which causes the old frame to show. S3 Savage4 has the same problem, |
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but ATI Rage 128 doesn't. I think it can be fixed later. Current code |
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works very well, so maybe double buffering is not needed right now. |
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Something strange happens when you try to move the window with the |
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overlay beyond the left border of the screen. The overlay tries to |
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stay at position x=0, but when attempting to move it a bit more it |
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jumps to position x=-60 (on GF2-MX, on ATI Rage128 this value a bit |
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smaller). It's really strange, looks like the overlay doesn't like |
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negative coordinates. |
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======================================================================= |
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5. Shared library building: |
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A shared library can be built, but before running the autogen.sh |
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script you must manually delete the libtool.m4 stuff from the acinclu- |
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de.m4 file (it comes after the ESD detection code up to the end of the |
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file), because the libtool stuff in the acinclude.m4 file was very old |
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in SDL distribution before the version 1.2.7 and doesn't knew anything |
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about QNX. SDL 1.2.7 distribution contain the new libtool.m4 script, |
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but anyway it is broken :), Just remove it, then run "libtoolize |
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--force --copy", delete the file aclocal.m4 and after that run the |
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autogen.sh script. |
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====================================================================== |
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6. Some building issues: |
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Feel free to not use the --disable-shared configure option if you' |
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ve read the above comment about 'Shared library building'. Otherwise |
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this option is strongly recommended, as without it the sdl-config |
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script will be broken. |
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Run the configure script without x11 support, e.g.: |
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a) for OpenGL support: |
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./configure --prefix=/usr \ |
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--disable-video-x11 \ |
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--disable-shared |
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b) without OpenGL support: |
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./configure --prefix=/usr \ |
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--disable-video-x11 \ |
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--disable-shared \ |
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--disable-video-opengl |
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In the test directory also run the ./configure script without |
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x11 support, e.g.: |
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./configure --with-sdl-prefix=/usr \ |
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--with-sdl-exec-prefix=/usr \ |
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--prefix=/usr --without-x |
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====================================================================== |
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7. Environment variables: |
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Please note that the photon driver is sensible to the following |
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environmental variables: |
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* SDL_PHOTON_FULLSCREEN_REFRESH - this environment variable controls |
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the refresh rate in all fullscreen modes. Be carefull !!! Photon drivers |
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usually do not checking the maximum refresh rate, which video adapter or |
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monitor supports. |
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135 |
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* SDL_VIDEO_WINDOW_POS - can be set in the "X,Y" format. If X and Y |
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coordinates are bigger than the current desktop resolution, then win- |
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dow positioning across virtual consoles is activated. If X and Y are |
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smaller than the desktop resolution then window positioning in the |
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current console is activated. The word "center" can be used instead of |
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coordinates, it produces the same behavior as SDL_VIDEO_CENTERED |
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environmental variable. |
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|
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* SDL_VIDEO_CENTERED - if this environmental variable exists then the |
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window centering is perfomed in the current virtual console. |
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|
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The SDL_VIDEO_CENTERED enviromental variable has greater priority |
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than the SDL_VIDEO_WINDOW_POS in case if both variables are supplied |
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149 |
to the application. |