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474 lines
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474 lines
22 KiB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQGLFormat Class Reference<br><small>[<a href="opengl.html">OpenGL module</a>]</small></h1>
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<p>The TQGLFormat class specifies the display format of an OpenGL
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rendering context.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="tqgl-h.html">tqgl.h</a>></tt>
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<p>Inherits <a href="tqgl.html">TQGL</a>.
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<p><a href="tqglformat-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#TQGLFormat"><b>TQGLFormat</b></a> ()</li>
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<li class=fn><a href="#TQGLFormat-2"><b>TQGLFormat</b></a> ( int options, int plane = 0 )</li>
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<li class=fn>bool <a href="#doubleBuffer"><b>doubleBuffer</b></a> () const</li>
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<li class=fn>void <a href="#setDoubleBuffer"><b>setDoubleBuffer</b></a> ( bool enable )</li>
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<li class=fn>bool <a href="#depth"><b>depth</b></a> () const</li>
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<li class=fn>void <a href="#setDepth"><b>setDepth</b></a> ( bool enable )</li>
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<li class=fn>bool <a href="#rgba"><b>rgba</b></a> () const</li>
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<li class=fn>void <a href="#setRgba"><b>setRgba</b></a> ( bool enable )</li>
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<li class=fn>bool <a href="#alpha"><b>alpha</b></a> () const</li>
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<li class=fn>void <a href="#setAlpha"><b>setAlpha</b></a> ( bool enable )</li>
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<li class=fn>bool <a href="#accum"><b>accum</b></a> () const</li>
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<li class=fn>void <a href="#setAccum"><b>setAccum</b></a> ( bool enable )</li>
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<li class=fn>bool <a href="#stencil"><b>stencil</b></a> () const</li>
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<li class=fn>void <a href="#setStencil"><b>setStencil</b></a> ( bool enable )</li>
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<li class=fn>bool <a href="#stereo"><b>stereo</b></a> () const</li>
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<li class=fn>void <a href="#setStereo"><b>setStereo</b></a> ( bool enable )</li>
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<li class=fn>bool <a href="#directRendering"><b>directRendering</b></a> () const</li>
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<li class=fn>void <a href="#setDirectRendering"><b>setDirectRendering</b></a> ( bool enable )</li>
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<li class=fn>bool <a href="#hasOverlay"><b>hasOverlay</b></a> () const</li>
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<li class=fn>void <a href="#setOverlay"><b>setOverlay</b></a> ( bool enable )</li>
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<li class=fn>int <a href="#plane"><b>plane</b></a> () const</li>
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<li class=fn>void <a href="#setPlane"><b>setPlane</b></a> ( int plane )</li>
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<li class=fn>void <a href="#setOption"><b>setOption</b></a> ( FormatOption opt )</li>
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<li class=fn>bool <a href="#testOption"><b>testOption</b></a> ( FormatOption opt ) const</li>
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</ul>
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<h2>Static Public Members</h2>
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<ul>
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<li class=fn>TQGLFormat <a href="#defaultFormat"><b>defaultFormat</b></a> ()</li>
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<li class=fn>void <a href="#setDefaultFormat"><b>setDefaultFormat</b></a> ( const TQGLFormat & f )</li>
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<li class=fn>TQGLFormat <a href="#defaultOverlayFormat"><b>defaultOverlayFormat</b></a> ()</li>
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<li class=fn>void <a href="#setDefaultOverlayFormat"><b>setDefaultOverlayFormat</b></a> ( const TQGLFormat & f )</li>
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<li class=fn>bool <a href="#hasOpenGL"><b>hasOpenGL</b></a> ()</li>
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<li class=fn>bool <a href="#hasOpenGLOverlays"><b>hasOpenGLOverlays</b></a> ()</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQGLFormat class specifies the display format of an OpenGL
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rendering context.
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<p>
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<p> A display format has several characteristics:
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<ul>
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<li> <a href="#setDoubleBuffer">Double or single buffering.</a>
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<li> <a href="#setDepth">Depth buffer.</a>
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<li> <a href="#setRgba">RGBA or color index mode.</a>
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<li> <a href="#setAlpha">Alpha channel.</a>
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<li> <a href="#setAccum">Accumulation buffer.</a>
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<li> <a href="#setStencil">Stencil buffer.</a>
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<li> <a href="#setStereo">Stereo buffers.</a>
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<li> <a href="#setDirectRendering">Direct rendering.</a>
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<li> <a href="#setOverlay">Presence of an overlay.</a>
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<li> <a href="#setPlane">The plane of an overlay format.</a>
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</ul>
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<p> You create and tell a TQGLFormat object what rendering options you
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want from an OpenGL<sup>*</sup> rendering context.
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<p> OpenGL drivers or accelerated hardware may or may not support
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advanced features such as alpha channel or stereographic viewing.
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If you request some features that the driver/hardware does not
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provide when you create a <a href="tqglwidget.html">TQGLWidget</a>, you will get a rendering
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context with the nearest subset of features.
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<p> There are different ways to define the display characteristics of
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a rendering context. One is to create a TQGLFormat and make it the
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default for the entire application:
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<pre>
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TQGLFormat f;
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f.<a href="#setAlpha">setAlpha</a>( TRUE );
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f.<a href="#setStereo">setStereo</a>( TRUE );
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TQGLFormat::<a href="#setDefaultFormat">setDefaultFormat</a>( f );
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</pre>
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<p> Or you can specify the desired format when creating an object of
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your TQGLWidget subclass:
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<pre>
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TQGLFormat f;
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f.<a href="#setDoubleBuffer">setDoubleBuffer</a>( FALSE ); // single buffer
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f.<a href="#setDirectRendering">setDirectRendering</a>( FALSE ); // software rendering
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MyGLWidget* myWidget = new MyGLWidget( f, ... );
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</pre>
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<p> After the widget has been created, you can find out which of the
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requested features the system was able to provide:
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<pre>
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TQGLFormat f;
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f.<a href="#setOverlay">setOverlay</a>( TRUE );
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f.<a href="#setStereo">setStereo</a>( TRUE );
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MyGLWidget* myWidget = new MyGLWidget( f, ... );
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if ( !w->format().stereo() ) {
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// ok, goggles off
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if ( !w->format().hasOverlay() ) {
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<a href="tqapplication.html#qFatal">tqFatal</a>( "Cool hardware required" );
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}
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}
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</pre>
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<p> <sup>*</sup> OpenGL is a trademark of Silicon Graphics, Inc. in the
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United States and other countries.
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<p> <p>See also <a href="tqglcontext.html">TQGLContext</a>, <a href="tqglwidget.html">TQGLWidget</a>, <a href="graphics.html">Graphics Classes</a>, and <a href="images.html">Image Processing Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQGLFormat"></a>TQGLFormat::TQGLFormat ()
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</h3>
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Constructs a TQGLFormat object with the factory default settings:
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<ul>
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<li> <a href="#setDoubleBuffer">Double buffer:</a> Enabled.
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<li> <a href="#setDepth">Depth buffer:</a> Enabled.
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<li> <a href="#setRgba">RGBA:</a> Enabled (i.e., color index disabled).
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<li> <a href="#setAlpha">Alpha channel:</a> Disabled.
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<li> <a href="#setAccum">Accumulator buffer:</a> Disabled.
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<li> <a href="#setStencil">Stencil buffer:</a> Disabled.
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<li> <a href="#setStereo">Stereo:</a> Disabled.
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<li> <a href="#setDirectRendering">Direct rendering:</a> Enabled.
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<li> <a href="#setOverlay">Overlay:</a> Disabled.
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<li> <a href="#setPlane">Plane:</a> 0 (i.e., normal plane).
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</ul>
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<h3 class=fn><a name="TQGLFormat-2"></a>TQGLFormat::TQGLFormat ( int options, int plane = 0 )
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</h3>
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Creates a TQGLFormat object that is a copy of the current <a href="#defaultFormat">application default format</a>.
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<p> If <em>options</em> is not 0, this copy is modified by these format
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options. The <em>options</em> parameter should be <a href="tqgl.html#FormatOption-enum">FormatOption</a> values
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OR'ed together.
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<p> This constructor makes it easy to specify a certain desired format
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in classes derived from <a href="tqglwidget.html">TQGLWidget</a>, for example:
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<pre>
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// The rendering in MyGLWidget depends on using
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// stencil buffer and alpha channel
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MyGLWidget::MyGLWidget( <a href="tqwidget.html">TQWidget</a>* parent, const char* name )
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: <a href="tqglwidget.html">TQGLWidget</a>( <a href="#TQGLFormat">TQGLFormat</a>( StencilBuffer | AlphaChannel ), parent, name )
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{
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if ( !format().stencil() )
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<a href="tqapplication.html#qWarning">tqWarning</a>( "Could not get stencil buffer; results will be suboptimal" );
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if ( !format().alphaChannel() )
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<a href="tqapplication.html#qWarning">tqWarning</a>( "Could not get alpha channel; results will be suboptimal" );
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...
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}
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</pre>
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<p> Note that there are <a href="tqgl.html#FormatOption-enum">FormatOption</a> values to turn format settings
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both on and off, e.g. <a href="tqgl.html#FormatOption-enum">DepthBuffer</a> and <a href="tqgl.html#FormatOption-enum">NoDepthBuffer</a>,
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<a href="tqgl.html#FormatOption-enum">DirectRendering</a> and <a href="tqgl.html#FormatOption-enum">IndirectRendering</a>, etc.
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<p> The <em>plane</em> parameter defaults to 0 and is the plane which this
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format should be associated with. Not all OpenGL implmentations
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supports overlay/underlay rendering planes.
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<p> <p>See also <a href="#defaultFormat">defaultFormat</a>() and <a href="#setOption">setOption</a>().
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<h3 class=fn>bool <a name="accum"></a>TQGLFormat::accum () const
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</h3>
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<p> Returns TRUE if the accumulation buffer is enabled; otherwise
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returns FALSE. The accumulation buffer is disabled by default.
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<p> <p>See also <a href="#setAccum">setAccum</a>().
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<h3 class=fn>bool <a name="alpha"></a>TQGLFormat::alpha () const
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</h3>
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<p> Returns TRUE if the alpha channel of the framebuffer is enabled;
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otherwise returns FALSE. The alpha channel is disabled by default.
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<p> <p>See also <a href="#setAlpha">setAlpha</a>().
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<h3 class=fn><a href="tqglformat.html">TQGLFormat</a> <a name="defaultFormat"></a>TQGLFormat::defaultFormat ()<tt> [static]</tt>
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</h3>
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Returns the default TQGLFormat for the application. All TQGLWidgets
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that are created use this format unless another format is
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specified, e.g. when they are constructed.
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<p> If no special default format has been set using
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<a href="#setDefaultFormat">setDefaultFormat</a>(), the default format is the same as that created
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with TQGLFormat().
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<p> <p>See also <a href="#setDefaultFormat">setDefaultFormat</a>().
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<h3 class=fn><a href="tqglformat.html">TQGLFormat</a> <a name="defaultOverlayFormat"></a>TQGLFormat::defaultOverlayFormat ()<tt> [static]</tt>
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</h3>
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Returns the default TQGLFormat for overlay contexts.
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<p> The factory default overlay format is:
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<ul>
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<li> <a href="#setDoubleBuffer">Double buffer:</a> Disabled.
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<li> <a href="#setDepth">Depth buffer:</a> Disabled.
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<li> <a href="#setRgba">RGBA:</a> Disabled (i.e., color index enabled).
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<li> <a href="#setAlpha">Alpha channel:</a> Disabled.
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<li> <a href="#setAccum">Accumulator buffer:</a> Disabled.
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<li> <a href="#setStencil">Stencil buffer:</a> Disabled.
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<li> <a href="#setStereo">Stereo:</a> Disabled.
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<li> <a href="#setDirectRendering">Direct rendering:</a> Enabled.
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<li> <a href="#setOverlay">Overlay:</a> Disabled.
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<li> <a href="#setPlane">Plane:</a> 1 (i.e., first overlay plane).
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</ul>
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<p> <p>See also <a href="#setDefaultFormat">setDefaultFormat</a>().
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<h3 class=fn>bool <a name="depth"></a>TQGLFormat::depth () const
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</h3>
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<p> Returns TRUE if the depth buffer is enabled; otherwise returns
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FALSE. The depth buffer is enabled by default.
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<p> <p>See also <a href="#setDepth">setDepth</a>().
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<h3 class=fn>bool <a name="directRendering"></a>TQGLFormat::directRendering () const
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</h3>
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<p> Returns TRUE if direct rendering is enabled; otherwise returns
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FALSE.
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<p> Direct rendering is enabled by default.
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<p> <p>See also <a href="#setDirectRendering">setDirectRendering</a>().
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<h3 class=fn>bool <a name="doubleBuffer"></a>TQGLFormat::doubleBuffer () const
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</h3>
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<p> Returns TRUE if double buffering is enabled; otherwise returns
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FALSE. Double buffering is enabled by default.
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<p> <p>See also <a href="#setDoubleBuffer">setDoubleBuffer</a>().
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<h3 class=fn>bool <a name="hasOpenGL"></a>TQGLFormat::hasOpenGL ()<tt> [static]</tt>
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</h3>
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<p> Returns TRUE if the window system has any OpenGL support;
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otherwise returns FALSE.
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<p> <b>Warning:</b> This function must not be called until the <a href="tqapplication.html">TQApplication</a>
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object has been created.
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<h3 class=fn>bool <a name="hasOpenGLOverlays"></a>TQGLFormat::hasOpenGLOverlays ()<tt> [static]</tt>
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</h3>
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<p> Returns TRUE if the window system supports OpenGL overlays;
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otherwise returns FALSE.
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<p> <b>Warning:</b> This function must not be called until the <a href="tqapplication.html">TQApplication</a>
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object has been created.
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<h3 class=fn>bool <a name="hasOverlay"></a>TQGLFormat::hasOverlay () const
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</h3>
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<p> Returns TRUE if overlay plane is enabled; otherwise returns FALSE.
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<p> Overlay is disabled by default.
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<p> <p>See also <a href="#setOverlay">setOverlay</a>().
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<h3 class=fn>int <a name="plane"></a>TQGLFormat::plane () const
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</h3>
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Returns the plane of this format. The default for normal formats
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is 0, which means the normal plane. The default for overlay
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formats is 1, which is the first overlay plane.
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<p> <p>See also <a href="#setPlane">setPlane</a>().
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<h3 class=fn>bool <a name="rgba"></a>TQGLFormat::rgba () const
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</h3>
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<p> Returns TRUE if RGBA color mode is set. Returns FALSE if color
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index mode is set. The default color mode is RGBA.
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<p> <p>See also <a href="#setRgba">setRgba</a>().
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<h3 class=fn>void <a name="setAccum"></a>TQGLFormat::setAccum ( bool enable )
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</h3>
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If <em>enable</em> is TRUE enables the accumulation buffer; otherwise
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disables the accumulation buffer.
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<p> The accumulation buffer is disabled by default.
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<p> The accumulation buffer is used to create blur effects and
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multiple exposures.
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<p> <p>See also <a href="#accum">accum</a>().
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<h3 class=fn>void <a name="setAlpha"></a>TQGLFormat::setAlpha ( bool enable )
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</h3>
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If <em>enable</em> is TRUE enables the alpha channel; otherwise disables
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the alpha channel.
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<p> The alpha buffer is disabled by default.
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<p> The alpha channel is typically used for implementing transparency
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or translucency. The A in RGBA specifies the transparency of a
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pixel.
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<p> <p>See also <a href="#alpha">alpha</a>().
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<h3 class=fn>void <a name="setDefaultFormat"></a>TQGLFormat::setDefaultFormat ( const <a href="tqglformat.html">TQGLFormat</a> & f )<tt> [static]</tt>
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</h3>
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Sets a new default TQGLFormat for the application to <em>f</em>. For
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example, to set single buffering as the default instead of double
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buffering, your main() might contain code like this:
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<pre>
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<a href="tqapplication.html">TQApplication</a> a(argc, argv);
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TQGLFormat f;
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f.<a href="#setDoubleBuffer">setDoubleBuffer</a>( FALSE );
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TQGLFormat::<a href="#setDefaultFormat">setDefaultFormat</a>( f );
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</pre>
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<p> <p>See also <a href="#defaultFormat">defaultFormat</a>().
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<h3 class=fn>void <a name="setDefaultOverlayFormat"></a>TQGLFormat::setDefaultOverlayFormat ( const <a href="tqglformat.html">TQGLFormat</a> & f )<tt> [static]</tt>
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</h3>
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Sets a new default TQGLFormat for overlay contexts to <em>f</em>. This
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format is used whenever a <a href="tqglwidget.html">TQGLWidget</a> is created with a format that
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<a href="#hasOverlay">hasOverlay</a>() enabled.
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<p> For example, to get a double buffered overlay context (if
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available), use code like this:
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<p> <pre>
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TQGLFormat f = TQGLFormat::<a href="#defaultOverlayFormat">defaultOverlayFormat</a>();
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f.<a href="#setDoubleBuffer">setDoubleBuffer</a>( TRUE );
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TQGLFormat::<a href="#setDefaultOverlayFormat">setDefaultOverlayFormat</a>( f );
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</pre>
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<p> As usual, you can find out after widget creation whether the
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underlying OpenGL system was able to provide the requested
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specification:
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<p> <pre>
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// ...continued from above
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MyGLWidget* myWidget = new MyGLWidget( <a href="#TQGLFormat">TQGLFormat</a>( TQGL::<a href="tqgl.html#FormatOption-enum">HasOverlay</a> ), ... );
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if ( myWidget->format().hasOverlay() ) {
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// Yes, we got an overlay, let's check _its_ format:
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<a href="tqglcontext.html">TQGLContext</a>* olContext = myWidget->overlayContext();
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if ( olContext-><a href="tqglcontext.html#format">format</a>().doubleBuffer() )
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; // yes, we got a double buffered overlay
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else
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; // no, only single buffered overlays are available
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}
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</pre>
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<p> <p>See also <a href="#defaultOverlayFormat">defaultOverlayFormat</a>().
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<h3 class=fn>void <a name="setDepth"></a>TQGLFormat::setDepth ( bool enable )
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</h3>
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If <em>enable</em> is TRUE enables the depth buffer; otherwise disables
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the depth buffer.
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<p> The depth buffer is enabled by default.
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|
<p> The purpose of a depth buffer (or Z-buffering) is to remove hidden
|
|
surfaces. Pixels are assigned Z values based on the distance to
|
|
the viewer. A pixel with a high Z value is closer to the viewer
|
|
than a pixel with a low Z value. This information is used to
|
|
decide whether to draw a pixel or not.
|
|
<p> <p>See also <a href="#depth">depth</a>().
|
|
|
|
<h3 class=fn>void <a name="setDirectRendering"></a>TQGLFormat::setDirectRendering ( bool enable )
|
|
</h3>
|
|
If <em>enable</em> is TRUE enables direct rendering; otherwise disables
|
|
direct rendering.
|
|
<p> Direct rendering is enabled by default.
|
|
<p> Enabling this option will make OpenGL bypass the underlying window
|
|
system and render directly from hardware to the screen, if this is
|
|
supported by the system.
|
|
<p> <p>See also <a href="#directRendering">directRendering</a>().
|
|
|
|
<h3 class=fn>void <a name="setDoubleBuffer"></a>TQGLFormat::setDoubleBuffer ( bool enable )
|
|
</h3>
|
|
If <em>enable</em> is TRUE sets double buffering; otherwise sets single
|
|
buffering.
|
|
<p> Double buffering is enabled by default.
|
|
<p> Double buffering is a technique where graphics are rendered on an
|
|
off-screen buffer and not directly to the screen. When the drawing
|
|
has been completed, the program calls a swapBuffers() function to
|
|
exchange the screen contents with the buffer. The result is
|
|
flicker-free drawing and often better performance.
|
|
<p> <p>See also <a href="#doubleBuffer">doubleBuffer</a>(), <a href="tqglcontext.html#swapBuffers">TQGLContext::swapBuffers</a>(), and <a href="tqglwidget.html#swapBuffers">TQGLWidget::swapBuffers</a>().
|
|
|
|
<h3 class=fn>void <a name="setOption"></a>TQGLFormat::setOption ( <a href="tqgl.html#FormatOption-enum">FormatOption</a> opt )
|
|
</h3>
|
|
Sets the format option to <em>opt</em>.
|
|
<p> <p>See also <a href="#testOption">testOption</a>().
|
|
|
|
<h3 class=fn>void <a name="setOverlay"></a>TQGLFormat::setOverlay ( bool enable )
|
|
</h3>
|
|
If <em>enable</em> is TRUE enables an overlay plane; otherwise disables
|
|
the overlay plane.
|
|
<p> Enabling the overlay plane will cause <a href="tqglwidget.html">TQGLWidget</a> to create an
|
|
additional context in an overlay plane. See the TQGLWidget
|
|
documentation for further information.
|
|
<p> <p>See also <a href="#hasOverlay">hasOverlay</a>().
|
|
|
|
<h3 class=fn>void <a name="setPlane"></a>TQGLFormat::setPlane ( int plane )
|
|
</h3>
|
|
Sets the requested plane to <em>plane</em>. 0 is the normal plane, 1 is
|
|
the first overlay plane, 2 is the second overlay plane, etc.; -1,
|
|
-2, etc. are underlay planes.
|
|
<p> Note that in contrast to other format specifications, the plane
|
|
specifications will be matched exactly. This means that if you
|
|
specify a plane that the underlying OpenGL system cannot provide,
|
|
an <a href="tqglwidget.html#isValid">invalid</a> <a href="tqglwidget.html">TQGLWidget</a> will be
|
|
created.
|
|
<p> <p>See also <a href="#plane">plane</a>().
|
|
|
|
<h3 class=fn>void <a name="setRgba"></a>TQGLFormat::setRgba ( bool enable )
|
|
</h3>
|
|
If <em>enable</em> is TRUE sets RGBA mode. If <em>enable</em> is FALSE sets
|
|
color index mode.
|
|
<p> The default color mode is RGBA.
|
|
<p> RGBA is the preferred mode for most OpenGL applications. In RGBA
|
|
color mode you specify colors as red + green + blue + alpha
|
|
quadruplets.
|
|
<p> In color index mode you specify an index into a color lookup
|
|
table.
|
|
<p> <p>See also <a href="#rgba">rgba</a>().
|
|
|
|
<h3 class=fn>void <a name="setStencil"></a>TQGLFormat::setStencil ( bool enable )
|
|
</h3>
|
|
If <em>enable</em> is TRUE enables the stencil buffer; otherwise
|
|
disables the stencil buffer.
|
|
<p> The stencil buffer is disabled by default.
|
|
<p> The stencil buffer masks certain parts of the drawing area so that
|
|
masked parts are not drawn on.
|
|
<p> <p>See also <a href="#stencil">stencil</a>().
|
|
|
|
<h3 class=fn>void <a name="setStereo"></a>TQGLFormat::setStereo ( bool enable )
|
|
</h3>
|
|
If <em>enable</em> is TRUE enables stereo buffering; otherwise disables
|
|
stereo buffering.
|
|
<p> Stereo buffering is disabled by default.
|
|
<p> Stereo buffering provides extra color buffers to generate left-eye
|
|
and right-eye images.
|
|
<p> <p>See also <a href="#stereo">stereo</a>().
|
|
|
|
<h3 class=fn>bool <a name="stencil"></a>TQGLFormat::stencil () const
|
|
</h3>
|
|
|
|
<p> Returns TRUE if the stencil buffer is enabled; otherwise returns
|
|
FALSE. The stencil buffer is disabled by default.
|
|
<p> <p>See also <a href="#setStencil">setStencil</a>().
|
|
|
|
<h3 class=fn>bool <a name="stereo"></a>TQGLFormat::stereo () const
|
|
</h3>
|
|
|
|
<p> Returns TRUE if stereo buffering is enabled; otherwise returns
|
|
FALSE. Stereo buffering is disabled by default.
|
|
<p> <p>See also <a href="#setStereo">setStereo</a>().
|
|
|
|
<h3 class=fn>bool <a name="testOption"></a>TQGLFormat::testOption ( <a href="tqgl.html#FormatOption-enum">FormatOption</a> opt ) const
|
|
</h3>
|
|
Returns TRUE if format option <em>opt</em> is set; otherwise returns FALSE.
|
|
<p> <p>See also <a href="#setOption">setOption</a>().
|
|
|
|
<!-- eof -->
|
|
<hr><p>
|
|
This file is part of the <a href="index.html">TQt toolkit</a>.
|
|
Copyright © 1995-2007
|
|
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
|
|
<table width=100% cellspacing=0 border=0><tr>
|
|
<td>Copyright © 2007
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
|
<td align=right><div align=right>TQt 3.3.8</div>
|
|
</table></div></address></body>
|
|
</html>
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