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made fghVisibility more intuitive, documented glutVisibilityfunc and

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glutWindowStatusFunc


git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1534 7f0cb862-5218-0410-a997-914c9d46530a
This commit is contained in:
dcnieho 2013-03-01 02:42:14 +00:00
parent a2e3b9c31d
commit 41dd280289
2 changed files with 66 additions and 3 deletions
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10
freeglut/freeglut/src/fg_callbacks.c
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@ -168,14 +168,18 @@ void FGAPIENTRY glutDisplayFunc( FGCBDisplay callback )
*/
static void fghVisibility( int status )
{
int glut_status = GLUT_VISIBLE;
int vis_status;
FREEGLUT_INTERNAL_ERROR_EXIT_IF_NOT_INITIALISED ( "Visibility Callback" );
freeglut_return_if_fail( fgStructure.CurrentWindow );
/* Translate window status func states to visibility states */
if( ( GLUT_HIDDEN == status ) || ( GLUT_FULLY_COVERED == status ) )
glut_status = GLUT_NOT_VISIBLE;
INVOKE_WCB( *( fgStructure.CurrentWindow ), Visibility, ( glut_status ) );
vis_status = GLUT_NOT_VISIBLE;
else /* GLUT_FULLY_RETAINED, GLUT_PARTIALLY_RETAINED */
vis_status = GLUT_VISIBLE;
INVOKE_WCB( *( fgStructure.CurrentWindow ), Visibility, ( vis_status ) );
}
void FGAPIENTRY glutVisibilityFunc( FGCBVisibility callback )

59
freeglut/web-src/docs/api.php
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@ -1283,6 +1283,65 @@ is not implemented in <i>freeglut</i>.
<h2>12.22 glutVisibilityFunc, glutWindowStatusFunc</h2>
<p>
The <tt>glutVisibilityFunc</tt> and the <tt>glutWindowStatusFunc</tt>
functions set the window's visibility and windowStatus callbacks for the
current window. Setting one supersedes the other. <i>Freeglut</i> calls
these callbacks when the visibility status of a window changes.
</p>
<p><b>Usage</b></p>
<p><tt>void glutVisibilityFunc ( void( *callback )( int state ));</tt>
<br><tt>void glutWindowStatusFunc ( void( *callback )( int state ));</tt>
</p>
<p><b>Description</b></p>
<p>
The state callback parameter is one of GLUT_HIDDEN, GLUT_FULLY_RETAINED,
GLUT_PARTIALLY_RETAINED, or GLUT_FULLY_COVERED depending on the current
window status of the window. GLUT_HIDDEN means that the window is not
shown (often meaning that the window is iconified). GLUT_FULLY_RETAINED
means that the window is fully retained (no pixels belonging to the
window are covered by other windows). GLUT_PARTIALLY_RETAINED means that
the window is partially retained (some but not all pixels belonging to
the window are covered by other windows). GLUT_FULLY_COVERED means the
window is shown but no part of the window is visible, i.e., until the
window's status changes, all further rendering to the window is
discarded.<br>
GLUT considers a window visible if any pixel of the window is visible or
any pixel of any descendant window is visible on the screen.<br>
GLUT applications are encouraged to disable rendering and/or animation
when windows have a status of either GLUT_HIDDEN or
GLUT_FULLY_COVERED.<br>
If the window status callback for a window is disabled and later
re-enabled, the window status of the window is undefined; any change in
window window status will be reported, that is if you disable a window
status callback and re-enable the callback, you are guaranteed the next
window status change will be reported.<br>
Setting the window status callback for a window disables the visibility
callback set for the window (and vice versa). The visibility callback is
set with <tt>glutVisibilityFunc</tt>. <tt>glutVisibilityFunc</tt> is
deprecated in favor of the more informative
<tt>glutWindowStatusFunc</tt>. For <tt>glutVisibilityFunc</tt>, the
state callback parameter is either GLUT_NOT_VISIBLE or GLUT_VISIBLE
depending on the current visibility of the window. GLUT_VISIBLE does not
distinguish a window being totally versus partially visible.
GLUT_NOT_VISIBLE means no part of the window is visible, i.e., until the
window's visibility changes, all further rendering to the window is
discarded.<br>
Not all window managers support such finegrained callback messages or
can even ensure basic correctness. On Windows, there are no
notifications if the visibility status of a window changes and
<i>FreeGLUT</i> might be in visible state even if the window is fully
obscured by other windows.
</p>
<p><b>Changes From GLUT</b></p>
<p>None.</p>
<h1>13. <a name="StateSetting"></a>State Setting and Retrieval Functions</h1>
<h2>13.1 glutSetOption</h2>