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Re: [Freeglut-developer] GameMode behaviour
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From: John F. F. <joh...@cy...> - 2009-11-12 13:03:48
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Clive,
Which operating system are you on, and do you have a patch
that I can put into the code?
- John
At 11:07 PM 11/11/2009, you wrote:
>John,
>I have just tested 2.6 RC1 from a binary created by Martin Payne (thanks
>Martin). It exhibits the _same_ behavior as 2.4.0
>
>GameMode can be made to work if the current window is explicitly destroyed
>and another created when returning from GameMode. Otherwise freeglut exits
>with an error because no current window is defined.
>
>Clive.
>
>--------------------------------------------------
>From: "Fay, John F Dr CTR USAF AFMC 46 SK" <joh...@eg...>
>Sent: Friday, November 06, 2009 3:04 PM
>To: "FreeGLUT developers list" <fre...@li...>
>Subject: Re: [Freeglut-developer] GameMode behaviour
>
> > Clive,
> >
> > Let me give you a couple more things to check.
> > (1) The SVN head version is much changed from 2.4.0.
> > Please make sure that the latest SVN version gives the same error.
> > (2) There is a "CurrentWindow" variable that indicated
> > which window is active. This is separate from the status of any
> > individual window. The error is apparently triggered because the "
> > CurrentWindow" variable is not set when "freeglut" leaves game mode.
> > (See freeglut_window.c near line 1368 and freeglut_internal.h near line
> > 785.)
> >
> > Thanks for chasing this down.
> >
> > John F. Fay
> > Technical Fellow
> > Jacobs Technology TEAS Group
> > 850-883-1294
> >
> > -----Original Message-----
> > From: Clive McCarthy [mailto:Cli...@ms...]
> > Sent: Friday, November 06, 2009 4:53 PM
> > To: FreeGLUT developers list
> > Subject: Re: [Freeglut-developer] GameMode behaviour
> >
> > John,
> > I have conducted a test which reports the following from freeglut 2.4.0
> > on
> > Ubuntu Linux with feeble Intel 945GM graphics:
> >
> > GameMode 1920x1200:32@60 is possible
> > GameMode is now active...
> > returning from GameMode
> >
> > freeglut (./art_show): ERROR Function <glutReshapeWindow> called
> > with no
> > current window defined.
> >
> > The first three lines are from my code (art_show). The ERROR is emitted
> > from
> > freeglut.
> >
> > According to the documentation I have read, the windows that exist prior
> > to
> > entering GameMode are supposed to be restored almost as if nothing had
> > happened. My standard set of call backs are reestablished immediately
> > after
> > calling glutLeaveGameMode() so it isn't that.
> >
> > I guess the thing to check is that when glutEnterGameMode() is called
> > the
> > first thing it should do is save the status of ALL the open windows and
> > that
> > when glutLeaveGameMode() is called they are restored.
> >
> > I'm about to try the same code on XP.
> > Clive.
> >
> >
> > --------------------------------------------------
> > From: "John F. Fay" <joh...@cy...>
> > Sent: Wednesday, November 04, 2009 4:48 AM
> > To: "FreeGLUT developers list"
> > <fre...@li...>
> > Subject: Re: [Freeglut-developer] GameMode behaviour
> >
> >> Clive,
> >>
> >> Many thanks for your contribution here. Is there anything
> >> that I need to put into "freeglut" to get it to work on Ubuntu before
> >> the next release?
> >>
> >> - John
> >>
> >>
> >> At 11:19 AM 9/28/2009, you wrote:
> >>>John=2C
> >>>Sorry to hear about the losses in you immediate family...
> >>>=20
> >>>I received good advice from someone [Member #20245] on the OpenGL
> > forum=2C
> >>>=
> >>>who made small modifications to my code and got GameMode to run
> >>>satisfactor=
> >>>ily on Ubuntu. I have appended the modified code to the end of this
> > email=
> >>>=2C so that others can see what probably works. I have not yet tested
> > this
> >>>=
> >>>myself.
> >>>=20
> >>>It seems my system calls to "wmctrl" to remove the Ubuntu toolbars may
> >
> >>>have=
> >>> upset things. I have also figured out that the network applet on the
> >
> >>> Ubunt=
> >>>u toolbar=2C which has been a problem=2C can be hidden/disabled so
> > that it
> >>>=
> >>>doesn't 'blink-through' the OpenGL renderings when using conventional
> >>>glutF=
> >>>ullScreen(). I now have a couple of solutions for truly full screen
> >>>freeglu=
> >>>t use=2C including the use of GameMode.
> >>>=20
> >>>Now that I have confirmation that it works on Ubuntu I shall test it
> > on
> >>>the=
> >>> feeble 945GM Intel hardware with both XP and Ubuntu. Intel's Ubuntu
> >>> OpenGL=
> >>> drivers for the 945GM are inferior to their XP drivers -- the former
> > is
> >>> on=
> >>>ly OpenGL 1.3 -- so I may have an issue with the driver.
> >>>=20
> >>>Clive.
> >>>----------------------------------------
> >>> > Date: Sun=2C 27 Sep 2009 21:19:34 -0500
> >>> > To: fre...@li...
> >>> > From: joh...@cy...
> >>> > Subject: Re: [Freeglut-developer] GameMode behaviour
> >>> >
> >>> > Clive=2C
> >>> >
> >>> > Thanks for your input. Unfortunately there isn't a lot more
> >>> > documentation beyond what you have found already.
> >>> >
> >>> > One thing that I seriously recommend is getting an
> >>> > up-to-date copy of the source. We've been trying to get out a new
> >>> > release for over a year now=2C but the main project admin is
> > working
> >>> > 16-hour days on his day job and I've been dealing with three deaths
> >>> > in my immediate family plus some other stuff that is going on. But
> >>> > we *are* working on it. When I can come up for air I will look at
> >>> > your e-mail in more detail.
> >>> >
> >>> > - John
> >>> >
> >>> >
> >>> > At 10:20 AM 9/6/2009=2C you wrote:
> >>> >
> >>> >>There is not a great deal of solid documentation to be found about
> >>> >>Glut's
> >>> >>GameMode. I found the following on the web but I wonder if it is a
> >>> >>reliab=
> >>>le
> >>> >>explanation of how GameMode _should_ function? Most examples merely
> >
> >>> >>show =
> >>>the
> >>> >>application entering GameMode and never returning. I have an
> >>> >>application
> >>> >>that needs to go full-screen and also return to decorated window
> > mode.
> >>> >>I'=
> >>>m
> >>> >>working with freeglut 2.4.0 on both Win XP and Linux Ubuntu and
> > with a
> >>> >>variety of graphics hardware Nvidia 8800 to Intel 945GM. I get
> > erratic
> >>> >>behaviour -- sometimes the return from GameMode has the video
> > driver
> >>> >>very
> >>> >>confused and a system has to be restarted -- on another platform
> > the
> >>> >>retu=
> >>>rn
> >>> >>takes several seconds.
> >>> >
> >>> >
> >>>_______________________________________________
> >>>
> >>>I tried your code with a few little changes and it worked fine for me.
> > The
> >>>=
> >>>changes that I made were to remove the system calls and to call init()
> >
> >>>alon=
> >>>g with the glut_OpenGL_call_backs() each time. I changed the code so
> > it
> >>>tog=
> >>>gles between fullscreen and windowed mode with any key press (except
> > esc
> >>>wh=
> >>>ich exits the program). Note I ran the following code on Ubuntu
> > 9.04+GNOME
> >>>=
> >>>window manager with freeglut. I would be curious if you can compile
> > and
> >>>run=
> >>> it without problems.
> >>>
> >>>Code://
> >>>http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=3Dshowfl=
> >>>at&Number=3D263588#Post263588
> >>>#include <cstdio>
> >>>#include <cstdlib>
> >>>#include <GL/glut.h>
> >>>void display(void)=3B
> >>>void init(void)=3B
> >>>void set_debug_window_size(void)=3B
> >>>void switch_to_full_screen(void)=3B
> >>>#define TRUE true
> >>>#define FALSE false
> >>>bool full_screen =3D FALSE=3B
> >>>int glut_pane_id =3D 0=3B
> >>>void SampleGameModeKeyboard( unsigned char cChar=2C int nMouseX=2C int
> >
> >>>nMou=
> >>>seY )
> >>>{
> >>> static int toggleMode=3Dtrue=3B
> >>> if( cChar =3D=3D 27 ) exit(0)=3B
> >>> if (toggleMode)
> >>> {
> >>> set_debug_window_size()=3B
> >>> toggleMode=3D!toggleMode=3B
> >>> }
> >>> else
> >>> {
> >>> switch_to_full_screen()=3B
> >>> toggleMode=3D!toggleMode=3B
> >>> }
> >>>}
> >>>
> >>>void glut_OpenGL_call_backs()
> >>>{
> >>> init()=3B
> >>> glutKeyboardFunc( SampleGameModeKeyboard )=3B
> >>> glutDisplayFunc(display)=3B
> >>>}=3B
> >>>void switch_to_full_screen(void)
> >>>{
> >>> char mode_string[24]=3B
> >>> full_screen =3D TRUE=3B
> >>> sprintf(mode_string=2C "%dx%d:32@60"=2C
> > glutGet(GLUT_SCREEN_WIDTH)=2C
> >>> glutGet(GLUT_SCREEN_HEIGHT))=3B
> >>> glutGameModeString(mode_string)=3B
> >>> if(glutGameModeGet(GLUT_GAME_MODE_POSSIBLE))
> >>> {
> >>> printf("GameMode %s is possible\n"=2C mode_string)=3B
> >>> // destroys the current graphics
> > window
> >>> glutDestroyWindow(glut_pane_id)=3B
> >>> glutEnterGameMode()=3B
> >>> glut_OpenGL_call_backs()=3B
> >>> // hide the cursor
> >>> glutSetCursor(GLUT_CURSOR_NONE)=3B
> >>> }
> >>> else
> >>> {
> >>> printf("GameMode %s NOT possible\n"=2C mode_string)=3B
> >>> glutFullScreen()=3B
> >>> }
> >>> #ifdef UBUNTU_PORT
> >>> //system("wmctrl -r\"FourteenthStreetStudio\" -b
> >>> add=2Cfullscreen=2Cskip_=
> >>>taskbar")=3B
> >>> #endif
> >>> if(glutGameModeGet(GLUT_GAME_MODE_ACTIVE))
> >>> {
> >>> printf("GameMode is now active...\n")=3B
> >>> }
> >>> else
> >>> {
> >>> //printf("GameMode is NOT active\n")=3B
> >>> }
> >>>}
> >>>
> >>>/*--------------------------------------------------------------------
> > -----=
> >>>-
> >>>set the window's width and position for debugging
> >>>Window managers (including gnome)
> >>>adhere to a standard interface=2C the EWMH/NetWM specification.
> >>>This allows programs that remote-control their functionality.
> >>>And fortunately=2C someone already has written one called "wmctrl".
> >>>----------------------------------------------------------------------
> > ----*=
> >>>/
> >>>#ifdef __FREEGLUT__
> >>>#define WINDOW_X_ORIGIN 0
> >>>#define WINDOW_Y_ORIGIN 0
> >>>#else
> >>>#define WINDOW_X_ORIGIN 4
> >>>#define WINDOW_Y_ORIGIN 24
> >>>#endif
> >>>void set_debug_window_size(void)
> >>>{
> >>> int screen_width=2C screen_length=3B
> >>> full_screen =3D FALSE=3B
> >>> if(glutGameModeGet(GLUT_GAME_MODE_ACTIVE))
> >>> {
> >>> printf("returning from GameMode\n")=3B
> >>> glutLeaveGameMode()=3B
> >>> glut_pane_id =3D glutCreateWindow("FourteenthStreetStudio")=3B
> >>> glut_OpenGL_call_backs()=3B
> >>> }
> >>> #ifdef UBUNTU_PORT
> >>> //system("wmctrl -r\"FourteenthStreetStudio\" -b
> >>> remove=2Cfullscreen=2Csk=
> >>>ip_taskbar")=3B
> >>> #endif
> >>> /*screen_width =3D glutGet(GLUT_SCREEN_WIDTH)=3B
> >>> screen_length =3D glutGet(GLUT_SCREEN_HEIGHT)=3B
> >>> switch(screen_width)
> >>> {
> >>> case 3840: // dual screen WUXGA
> >>> glutPositionWindow(WINDOW_X_ORIGIN + (screen_width / 2)=2C
> >>> WINDOW_Y_ORIGIN)=3B
> >>> glutReshapeWindow(1824=2C 1140)=3B // 16:10
> >>> break=3B
> >>> case 3200: // dual screen UXGA
> >>> glutPositionWindow(WINDOW_X_ORIGIN + (screen_width / 2)=2C
> >>> WINDOW_Y_ORIGIN)=3B
> >>> glutReshapeWindow (1584=2C 990)=3B // 16:10
> >>> break=3B
> >>> //etc
> >>> }
> >>> */
> >>>}
> >>>
> >>>// following modified from
> >>>http://www.opengl.org/resources/code/samples/glu=
> >>>t_examples/examples/cube.c
> >>>/* Copyright (c) Mark J. Kilgard=2C 1997. */
> >>>/* This program is freely distributable without licensing fees
> >>> and is provided without guarantee or warrantee expressed or
> >>> implied. This program is -not- in the public domain. */
> >>>/* This program was requested by Patrick Earl=3B hopefully someone
> > else
> >>> will write the equivalent Direct3D immediate mode program. */
> >>>#include <GL/glut.h>
> >>>GLfloat light_diffuse[] =3D /* Red diffuse light. */
> >>>{
> >>> 1.0=2C 0.0=2C 0.0=2C 1.0
> >>>}=3B
> >>>GLfloat light_position[] =3D /* Infinite light location. */
> >>>{
> >>> 1.0=2C 1.0=2C 1.0=2C 0.0
> >>>}=3B
> >>>GLfloat n[6][3] =3D /* Normals for the 6 faces of a
> > cube.
> >>>*/
> >>>{
> >>> {-1.0=2C 0.0=2C 0.0}=2C
> >>> { 0.0=2C 1.0=2C 0.0 } =2C
> >>> { 1.0=2C 0.0=2C 0.0 }=2C
> >>> {0.0=2C -1.0=2C 0.0}=2C
> >>> { 0.0=2C 0.0=2C 1.0 } =2C
> >>> { 0.0=2C 0.0=2C -1.0 }
> >>>}=3B
> >>>GLint faces[6][4] =3D /* Vertex indices for the 6 faces
> > of a
> >>>c=
> >>>ube. */
> >>>{
> >>> {0=2C 1=2C 2=2C 3}=2C
> >>> { 3=2C 2=2C 6=2C 7 } =2C
> >>> { 7=2C 6=2C 5=2C 4 }=2C
> >>> {4=2C 5=2C 1=2C 0}=2C
> >>> { 5=2C 6=2C 2=2C 1 } =2C
> >>> { 7=2C 4=2C 0=2C 3 }
> >>>}=3B
> >>>GLfloat v[8][3]=3B /* Will be filled in with X=2CY=2CZ
> >
> >>>vert=
> >>>exes. */
> >>>void
> >>>drawBox(void)
> >>>{
> >>> int i=3B
> >>> for (i =3D 0=3B i < 6=3B i++)
> >>> {
> >>> glBegin(GL_QUADS)=3B
> >>> glNormal3fv(&n[i][0])=3B
> >>> glVertex3fv(&v[faces[i][0]][0])=3B
> >>> glVertex3fv(&v[faces[i][1]][0])=3B
> >>> glVertex3fv(&v[faces[i][2]][0])=3B
> >>> glVertex3fv(&v[faces[i][3]][0])=3B
> >>> glEnd()=3B
> >>> }
> >>>}
> >>>
> >>>void
> >>>display(void)
> >>>{
> >>> glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)=3B
> >>> drawBox()=3B
> >>> glutSwapBuffers()=3B
> >>>}
> >>>
> >>>void
> >>>init(void)
> >>>{
> >>> /* Setup cube vertex data. */
> >>> v[0][0] =3D v[1][0] =3D v[2][0] =3D v[3][0] =3D -1=3B
> >>> v[4][0] =3D v[5][0] =3D v[6][0] =3D v[7][0] =3D 1=3B
> >>> v[0][1] =3D v[1][1] =3D v[4][1] =3D v[5][1] =3D -1=3B
> >>> v[2][1] =3D v[3][1] =3D v[6][1] =3D v[7][1] =3D 1=3B
> >>> v[0][2] =3D v[3][2] =3D v[4][2] =3D v[7][2] =3D 1=3B
> >>> v[1][2] =3D v[2][2] =3D v[5][2] =3D v[6][2] =3D -1=3B
> >>> /* Enable a single OpenGL light. */
> >>> glLightfv(GL_LIGHT0=2C GL_DIFFUSE=2C light_diffuse)=3B
> >>> glLightfv(GL_LIGHT0=2C GL_POSITION=2C light_position)=3B
> >>> glEnable(GL_LIGHT0)=3B
> >>> glEnable(GL_LIGHTING)=3B
> >>> /* Use depth buffering for hidden surface elimination. */
> >>> glEnable(GL_DEPTH_TEST)=3B
> >>> /* Setup the view of the cube. */
> >>> glMatrixMode(GL_PROJECTION)=3B
> >>> gluPerspective( /* field of view in degree */ 40.0=2C
> >>> /* aspect ratio */ 1.0=2C
> >>> /* Z near */ 1.0=2C /* Z far */ 10.0)=3B
> >>> glMatrixMode(GL_MODELVIEW)=3B
> >>> gluLookAt(0.0=2C 0.0=2C 5.0=2C /* eye is at (0=2C0=2C5) */
> >>> 0.0=2C 0.0=2C 0.0=2C /* center is at (0=2C0=2C0) */
> >>> 0.0=2C 1.0=2C 0.)=3B /* up is in positive Y
> > direction
> >>> */
> >>> /* Adjust cube position to be asthetic angle. */
> >>> glTranslatef(0.0=2C 0.0=2C -1.0)=3B
> >>> glRotatef(60=2C 1.0=2C 0.0=2C 0.0)=3B
> >>> glRotatef(-20=2C 0.0=2C 0.0=2C 1.0)=3B
> >>>}
> >>>
> >>>int
> >>>main(int argc=2C char **argv)
> >>>{
> >>> glutInit(&argc=2C argv)=3B
> >>> glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH)=3B
> >>> glut_pane_id=3DglutCreateWindow("red 3D lighted cube")=3B
> >>> switch_to_full_screen()=3B
> >>> glutMainLoop()=3B
> >>> return 0=3B /* ANSI C requires main to return
> > int.
> >>> *=
> >>>/
> >>>} =0A=
> >>>_________________________________________________________________=0A=
> >>>Hotmail=AE has ever-growing storage! Don=92t worry about storage
> >>>limits.=0A=
> >>>http://windowslive.com/Tutorial/Hotmail/Storage?ocid=3DTXT_TAGLM_WL_HM
> > _Tuto=
> >>>rial_Storage_062009=
> >>>
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