Cleaned up fgOpenWindow():
* Removed TABs.
* Made indentation consistant.
* Deleted say-nothing-new comments.
* Changed an *error*check* from an assert to an if().
(The error-check was on window creation; we don't want to
lose that if the user compiles with asserts deactivated.
Also, assert()s really tell us more about programming errors,
rather than run-time errors, so it is a little misleading to
use assert() for error-checks, even if you can depend upon
assert()s never being compiled away to null statements.)
* Added some XXX comments for things that bear some rumination.
git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@275 7f0cb862-5218-0410-a997-914c9d46530a
This commit is contained in:
rkrolib
parent
ba6ee1d34a
commit
6674df547f
@ -249,7 +249,9 @@ void fgSetWindow ( SFG_Window *window )
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* Opens a window. Requires a SFG_Window object created and attached
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* to the freeglut structure. OpenGL context is created here.
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*/
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void fgOpenWindow( SFG_Window* window, const char* title, int x, int y, int w, int h, GLboolean gameMode, int isSubWindow )
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void fgOpenWindow( SFG_Window* window, const char* title,
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int x, int y, int w, int h,
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GLboolean gameMode, int isSubWindow )
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{
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#if TARGET_HOST_UNIX_X11
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XSetWindowAttributes winAttr;
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@ -261,95 +263,82 @@ void fgOpenWindow( SFG_Window* window, const char* title, int x, int y, int w, i
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freeglut_assert_ready;
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/*
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* Here we are upon the stage. Have the visual selected.
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* XXX fgChooseVisual() is a common part of all three.
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* XXX With a little thought, we should be able to greatly
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* XXX simplify this.
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*/
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if ( fgState.BuildingAMenu )
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if ( !fgState.BuildingAMenu )
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window->Window.VisualInfo = fgChooseVisual();
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else if ( fgStructure.MenuContext )
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window->Window.VisualInfo = fgChooseVisual();
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else
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{
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/*
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* If there isn't already an OpenGL rendering context for menu windows, make one
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*/
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if ( !fgStructure.MenuContext )
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{
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unsigned int current_DisplayMode = fgState.DisplayMode ;
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fgState.DisplayMode = GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH ;
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window->Window.VisualInfo = fgChooseVisual();
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fgState.DisplayMode = current_DisplayMode ;
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}
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else
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window->Window.VisualInfo = fgChooseVisual();
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}
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else
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window->Window.VisualInfo = fgChooseVisual();
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if ( ! window->Window.VisualInfo )
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{
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/*
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* The "fgChooseVisual" returned a null meaning that the visual context is not available.
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* Try a couple of variations to see if they will work.
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*/
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if ( ! ( fgState.DisplayMode & GLUT_DOUBLE ) )
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{
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/*
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* Single buffering--try it doubled
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* The "fgChooseVisual" returned a null meaning that the visual
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* context is not available.
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* Try a couple of variations to see if they will work.
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*/
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fgState.DisplayMode |= GLUT_DOUBLE ;
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window->Window.VisualInfo = fgChooseVisual();
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/* OK, we got a double-buffered window, but we only wanted
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* single-buffered. Clear the double-buffer flag now.
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*/
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fgState.DisplayMode &= ~GLUT_DOUBLE ;
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}
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if ( ! ( fgState.DisplayMode & GLUT_DOUBLE ) )
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{
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fgState.DisplayMode |= GLUT_DOUBLE ;
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window->Window.VisualInfo = fgChooseVisual();
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fgState.DisplayMode &= ~GLUT_DOUBLE ;
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}
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/*
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* GLUT also checks for multi-sampling, but I don't see that anywhere else in FREEGLUT
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* so I won't bother with it for the moment.
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*/
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/*
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* GLUT also checks for multi-sampling, but I don't see that
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* anywhere else in FREEGLUT so I won't bother with it for the moment.
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*/
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}
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assert( window->Window.VisualInfo != NULL );
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/*
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* Have the windows attributes set
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*
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* HINT: the masks should be updated when adding/removing callbacks.
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* This might speed up message processing. Is that true?
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* XXX HINT: the masks should be updated when adding/removing callbacks.
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* XXX This might speed up message processing. Is that true?
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* XXX
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* XXX A: Not appreciably, but it WILL make it easier to debug.
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* XXX Try tracing old GLUT and try tracing freeglut. Old GLUT
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* XXX turns off events that it doesn't need and is a whole lot
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* XXX more pleasant to trace. (Hint: Think mouse-motion!)
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* XXX
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* XXX It may make a difference in networked environments or on
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* XXX some very slow systems, but I think that that is secondary
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* XXX to making debugging easier.
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*/
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winAttr.event_mask = StructureNotifyMask | SubstructureNotifyMask | ExposureMask |
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ButtonPressMask | ButtonReleaseMask | KeyPressMask | KeyRelease |
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VisibilityChangeMask | EnterWindowMask | LeaveWindowMask |
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PointerMotionMask | ButtonMotionMask;
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winAttr.event_mask = StructureNotifyMask | SubstructureNotifyMask |
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ExposureMask | ButtonPressMask | ButtonReleaseMask | KeyPressMask |
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KeyRelease | VisibilityChangeMask | EnterWindowMask | LeaveWindowMask |
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PointerMotionMask | ButtonMotionMask;
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winAttr.background_pixmap = None;
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winAttr.background_pixel = 0;
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winAttr.border_pixel = 0;
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/*
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* The color map is required, too
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*/
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winAttr.colormap = XCreateColormap(
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fgDisplay.Display, fgDisplay.RootWindow,
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window->Window.VisualInfo->visual, AllocNone
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);
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/*
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* This tells the XCreateWindow() what attributes are we supplying it with
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*/
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mask = CWBackPixmap | CWBorderPixel | CWColormap | CWEventMask;
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/*
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* If this is a menu window we want the window manager to ignore it.
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*/
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if ( fgState.BuildingAMenu )
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{
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winAttr.override_redirect = True;
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mask |= CWOverrideRedirect;
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mask |= CWOverrideRedirect;
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}
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/*
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* Have the window created now
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*/
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window->Window.Handle = XCreateWindow(
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fgDisplay.Display,
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window->Parent == NULL ? fgDisplay.RootWindow : window->Parent->Window.Handle,
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window->Parent == NULL ? fgDisplay.RootWindow :
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window->Parent->Window.Handle,
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x, y, w, h, 0,
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window->Window.VisualInfo->depth, InputOutput,
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window->Window.VisualInfo->visual, mask,
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@ -362,21 +351,23 @@ void fgOpenWindow( SFG_Window* window, const char* title, int x, int y, int w, i
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*/
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if ( fgState.BuildingAMenu )
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{
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/*
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* If there isn't already an OpenGL rendering context for menu windows, make one
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*/
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if ( !fgStructure.MenuContext )
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{
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fgStructure.MenuContext = (SFG_MenuContext *)malloc ( sizeof(SFG_MenuContext) ) ;
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fgStructure.MenuContext->VisualInfo = window->Window.VisualInfo ;
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fgStructure.MenuContext->Context = glXCreateContext(
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fgDisplay.Display, fgStructure.MenuContext->VisualInfo,
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NULL, fgState.ForceDirectContext | fgState.TryDirectContext
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);
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}
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/*
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* If there isn't already an OpenGL rendering context for menu
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* windows, make one
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*/
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if ( !fgStructure.MenuContext )
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{
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fgStructure.MenuContext =
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(SFG_MenuContext *)malloc ( sizeof(SFG_MenuContext) );
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fgStructure.MenuContext->VisualInfo = window->Window.VisualInfo;
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fgStructure.MenuContext->Context = glXCreateContext(
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fgDisplay.Display, fgStructure.MenuContext->VisualInfo,
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NULL, fgState.ForceDirectContext | fgState.TryDirectContext
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);
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}
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/* window->Window.Context = fgStructure.MenuContext->Context ; */
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window->Window.Context = glXCreateContext(
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window->Window.Context = glXCreateContext(
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fgDisplay.Display, window->Window.VisualInfo,
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NULL, fgState.ForceDirectContext | fgState.TryDirectContext
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);
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@ -392,20 +383,16 @@ void fgOpenWindow( SFG_Window* window, const char* title, int x, int y, int w, i
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);
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}
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else
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window->Window.Context = glXCreateContext(
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fgDisplay.Display, window->Window.VisualInfo,
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NULL, fgState.ForceDirectContext | fgState.TryDirectContext
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);
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window->Window.Context = glXCreateContext(
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fgDisplay.Display, window->Window.VisualInfo,
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NULL, fgState.ForceDirectContext | fgState.TryDirectContext
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);
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/*
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* Make sure the context is direct when the user wants it forced
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*/
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if( fgState.ForceDirectContext && !glXIsDirect( fgDisplay.Display, window->Window.Context ) )
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fgError( "unable to force direct context rendering for window '%s'", title );
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if( fgState.ForceDirectContext &&
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!glXIsDirect( fgDisplay.Display, window->Window.Context ) )
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fgError( "unable to force direct context rendering for window '%s'",
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title );
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/*
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* Set the new context as the current one. That's all about the window creation.
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*/
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glXMakeCurrent(
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fgDisplay.Display,
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window->Window.Handle,
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@ -413,39 +400,39 @@ void fgOpenWindow( SFG_Window* window, const char* title, int x, int y, int w, i
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);
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/*
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* Assume the new window is visible by default
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* XXX Assume the new window is visible by default
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* XXX Is this a safe assumption?
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*/
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window->State.Visible = TRUE;
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/*
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* For the position and size hints -- make sure we are passing valid values
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*/
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sizeHints.flags = 0;
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if (fgState.Position.Use == TRUE) sizeHints.flags |= USPosition;
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if (fgState.Size.Use == TRUE) sizeHints.flags |= USSize;
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if (fgState.Position.Use == TRUE)
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sizeHints.flags |= USPosition;
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if (fgState.Size.Use == TRUE)
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sizeHints.flags |= USSize;
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/*
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* Fill in the size hints values now (the x, y, width and height
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* settings are obsolote, are there any more WMs that support them?)
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* Unless the X servers actually stop supporting these, we should
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* continue to fill them in. It is *not* our place to tell the user
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* that they should replace a window manager that they like, and which
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* works, just because *we* think that it's not "modern" enough.
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*/
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sizeHints.x = x; sizeHints.y = y;
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sizeHints.width = w; sizeHints.height = h;
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sizeHints.x = x;
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sizeHints.y = y;
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sizeHints.width = w;
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sizeHints.height = h;
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/*
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* We can have forced all new windows start in iconified state:
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*/
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wmHints.flags = StateHint;
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wmHints.initial_state = (fgState.ForceIconic == FALSE) ? NormalState : IconicState;
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wmHints.initial_state =
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(fgState.ForceIconic == FALSE) ? NormalState : IconicState;
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/*
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* Prepare the window and iconified window names...
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*/
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XStringListToTextProperty( (char **) &title, 1, &textProperty );
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/*
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* Set the window's properties now
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*/
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XSetWMProperties(
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fgDisplay.Display,
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window->Window.Handle,
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@ -457,118 +444,107 @@ void fgOpenWindow( SFG_Window* window, const char* title, int x, int y, int w, i
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&wmHints,
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NULL
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);
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/*
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* Make sure we are informed about the window deletion commands
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*/
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XSetWMProtocols( fgDisplay.Display, window->Window.Handle, &fgDisplay.DeleteWindow, 1 );
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/*
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* Finally, have the window mapped to our display
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*/
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XSetWMProtocols( fgDisplay.Display, window->Window.Handle,
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&fgDisplay.DeleteWindow, 1 );
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XMapWindow( fgDisplay.Display, window->Window.Handle );
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#elif TARGET_HOST_WIN32
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WNDCLASS wc;
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int flags;
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ATOM atom;
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WNDCLASS wc;
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int flags;
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ATOM atom;
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freeglut_assert_ready;
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/*
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* Grab the window class we have registered on glutInit():
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*/
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atom = GetClassInfo( fgDisplay.Instance, "FREEGLUT", &wc );
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assert( atom != 0 );
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/*
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* Grab the window class we have registered on glutInit():
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*/
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atom = GetClassInfo( fgDisplay.Instance, "FREEGLUT", &wc );
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assert( atom != 0 );
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if( gameMode == FALSE )
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if( gameMode != FALSE )
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{
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if ( ( !isSubWindow ) && ( ! window->IsMenu ) )
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{
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/*
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* Update the window dimensions, taking account of window decorations.
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* "freeglut" is to create the window with the outside of its border at (x,y)
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* and with dimensions (w,h).
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*/
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w += (GetSystemMetrics( SM_CXSIZEFRAME ) )*2;
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h += (GetSystemMetrics( SM_CYSIZEFRAME ) )*2 + GetSystemMetrics( SM_CYCAPTION );
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}
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/*
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* Check if the user wants us to use the default position/size
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*/
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if( fgState.Position.Use == FALSE ) { x = CW_USEDEFAULT; y = CW_USEDEFAULT; }
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if( fgState.Size .Use == FALSE ) { w = CW_USEDEFAULT; h = CW_USEDEFAULT; }
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/*
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* There's a small difference between creating the top, child and game mode windows
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*/
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flags = WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_VISIBLE;
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/*
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* If we're a menu, set our flags to include WS_POPUP to remove decorations
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*/
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if ( window->IsMenu )
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flags |= WS_POPUP ;
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else if( window->Parent == NULL )
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flags |= WS_OVERLAPPEDWINDOW;
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else
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flags |= WS_CHILD;
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}
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else
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{
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/*
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* In game mode, the story is a little bit different...
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*/
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assert( window->Parent == NULL );
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/*
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* Set the window creation flags appropriately to make the window entirely visible:
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* Set the window creation flags appropriately to make the window
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* entirely visible:
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*/
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flags = WS_POPUP | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_VISIBLE;
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}
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else
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{
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if ( ( !isSubWindow ) && ( ! window->IsMenu ) )
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{
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/*
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* Update the window dimensions, taking account of window
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* decorations. "freeglut" is to create the window with the
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* outside of its border at (x,y) and with dimensions (w,h).
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*/
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w += (GetSystemMetrics( SM_CXSIZEFRAME ) )*2;
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h += (GetSystemMetrics( SM_CYSIZEFRAME ) )*2 +
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GetSystemMetrics( SM_CYCAPTION );
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}
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/*
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* Create the window now, passing the freeglut window structure as the parameter
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*/
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window->Window.Handle = CreateWindow(
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"FREEGLUT",
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if( fgState.Position.Use == FALSE )
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{
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x = CW_USEDEFAULT;
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y = CW_USEDEFAULT;
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}
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if( fgState.Size.Use == FALSE )
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{
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w = CW_USEDEFAULT;
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h = CW_USEDEFAULT;
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}
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/*
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* There's a small difference between creating the top, child and
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* game mode windows
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*/
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flags = WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_VISIBLE;
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if ( window->IsMenu )
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flags |= WS_POPUP ;
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else if( window->Parent == NULL )
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flags |= WS_OVERLAPPEDWINDOW;
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else
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flags |= WS_CHILD;
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}
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window->Window.Handle = CreateWindow(
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"FREEGLUT",
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title,
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flags,
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flags,
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x, y, w, h,
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(HWND) window->Parent == NULL ? NULL : window->Parent->Window.Handle,
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(HMENU) NULL,
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fgDisplay.Instance,
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(LPVOID) window
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);
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/*
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* Make sure window was created
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*/
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assert( window->Window.Handle != NULL );
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(HWND) window->Parent == NULL ? NULL : window->Parent->Window.Handle,
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(HMENU) NULL,
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fgDisplay.Instance,
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(LPVOID) window
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);
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if( !( window->Window.Handle ) )
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fgError( "Failed to create a window (%s)!", title );
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/*
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* Show and update the main window. Hide the mouse cursor.
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* Show and update the main window. Hide(???) the mouse cursor.
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*/
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ShowWindow( window->Window.Handle, fgState.ForceIconic ? SW_SHOWMINIMIZED : SW_SHOW );
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ShowWindow( window->Window.Handle,
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fgState.ForceIconic ? SW_SHOWMINIMIZED : SW_SHOW );
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UpdateWindow( window->Window.Handle );
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ShowCursor( TRUE );
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#endif
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/*
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* Save the window's single- or double-buffering state
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*/
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window->Window.DoubleBuffered = ( fgState.DisplayMode & GLUT_DOUBLE ) ? 1 : 0 ;
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window->Window.DoubleBuffered =
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( fgState.DisplayMode & GLUT_DOUBLE ) ? 1 : 0 ;
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/*
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* If it's not double-buffered, make sure the rendering is done to the front buffer.
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* If it's not double-buffered, make sure the rendering is done to the
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* front buffer.
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*/
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if ( ! window->Window.DoubleBuffered )
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{
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glDrawBuffer ( GL_FRONT ) ;
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glReadBuffer ( GL_FRONT ) ;
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glDrawBuffer ( GL_FRONT ) ;
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glReadBuffer ( GL_FRONT ) ;
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}
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/*
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Reference in New Issue
Block a user