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| 31 | </td>
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| 32 | <td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QGLContext Class Reference<br><small>[<a href="opengl.html">OpenGL module</a>]</small></h1>
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| 33 |
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| 34 | <p>The QGLContext class encapsulates an OpenGL rendering context.
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| 35 | <a href="#details">More...</a>
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| 36 | <p><tt>#include <<a href="qgl-h.html">qgl.h</a>></tt>
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| 37 | <p>Inherits <a href="qgl.html">QGL</a>.
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| 38 | <p><a href="qglcontext-members.html">List of all member functions.</a>
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| 39 | <h2>Public Members</h2>
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| 40 | <ul>
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| 41 | <li class=fn><a href="#QGLContext"><b>QGLContext</b></a> ( const QGLFormat & format, QPaintDevice * device )</li>
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| 42 | <li class=fn>virtual <a href="#~QGLContext"><b>~QGLContext</b></a> ()</li>
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| 43 | <li class=fn>virtual bool <a href="#create"><b>create</b></a> ( const QGLContext * shareContext = 0 )</li>
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| 44 | <li class=fn>bool <a href="#isValid"><b>isValid</b></a> () const</li>
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| 45 | <li class=fn>bool <a href="#isSharing"><b>isSharing</b></a> () const</li>
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| 46 | <li class=fn>virtual void <a href="#reset"><b>reset</b></a> ()</li>
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| 47 | <li class=fn>QGLFormat <a href="#format"><b>format</b></a> () const</li>
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| 48 | <li class=fn>QGLFormat <a href="#requestedFormat"><b>requestedFormat</b></a> () const</li>
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| 49 | <li class=fn>virtual void <a href="#setFormat"><b>setFormat</b></a> ( const QGLFormat & format )</li>
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| 50 | <li class=fn>virtual void <a href="#makeCurrent"><b>makeCurrent</b></a> ()</li>
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| 51 | <li class=fn>virtual void <a href="#swapBuffers"><b>swapBuffers</b></a> () const</li>
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| 52 | <li class=fn>QPaintDevice * <a href="#device"><b>device</b></a> () const</li>
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| 53 | <li class=fn>QColor <a href="#overlayTransparentColor"><b>overlayTransparentColor</b></a> () const</li>
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| 54 | </ul>
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| 55 | <h2>Static Public Members</h2>
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| 56 | <ul>
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| 57 | <li class=fn>const QGLContext * <a href="#currentContext"><b>currentContext</b></a> ()</li>
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| 58 | </ul>
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| 59 | <h2>Protected Members</h2>
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| 60 | <ul>
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| 61 | <li class=fn>virtual bool <a href="#chooseContext"><b>chooseContext</b></a> ( const QGLContext * shareContext = 0 )</li>
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| 62 | <li class=fn>virtual void <a href="#doneCurrent"><b>doneCurrent</b></a> ()</li>
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| 63 | <li class=fn>virtual int <a href="#choosePixelFormat"><b>choosePixelFormat</b></a> ( void * dummyPfd, HDC pdc )</li>
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| 64 | <li class=fn>virtual void * <a href="#chooseVisual"><b>chooseVisual</b></a> ()</li>
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| 65 | <li class=fn>virtual void * <a href="#chooseMacVisual"><b>chooseMacVisual</b></a> ( GDHandle device )</li>
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| 66 | <li class=fn>bool <a href="#deviceIsPixmap"><b>deviceIsPixmap</b></a> () const</li>
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| 67 | <li class=fn>bool <a href="#windowCreated"><b>windowCreated</b></a> () const</li>
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| 68 | <li class=fn>void <a href="#setWindowCreated"><b>setWindowCreated</b></a> ( bool on )</li>
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| 69 | <li class=fn>bool <a href="#initialized"><b>initialized</b></a> () const</li>
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| 70 | <li class=fn>void <a href="#setInitialized"><b>setInitialized</b></a> ( bool on )</li>
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| 71 | <li class=fn>void <a href="#generateFontDisplayLists"><b>generateFontDisplayLists</b></a> ( const QFont & font, int listBase )</li>
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| 72 | </ul>
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| 73 | <hr><a name="details"></a><h2>Detailed Description</h2>
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| 74 |
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| 75 |
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| 76 | The QGLContext class encapsulates an OpenGL rendering context.
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| 77 |
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| 78 | <p>
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| 79 |
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| 80 |
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| 81 | <p> An OpenGL<sup>*</sup> rendering context is a complete set of
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| 82 | OpenGL state variables.
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| 83 | <p> The context's <a href="qgl.html#FormatOption-enum">format</a> is set in the
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| 84 | constructor or later with <a href="#setFormat">setFormat</a>(). The format options that are
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| 85 | actually set are returned by <a href="#format">format</a>(); the options you asked for
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| 86 | are returned by <a href="#requestedFormat">requestedFormat</a>(). Note that after a QGLContext
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| 87 | object has been constructed, the actual OpenGL context must be
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| 88 | created by explicitly calling the <a href="#create">create()</a>
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| 89 | function. The <a href="#makeCurrent">makeCurrent</a>() function makes this context the
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| 90 | current rendering context. You can make <em>no</em> context current
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| 91 | using <a href="#doneCurrent">doneCurrent</a>(). The <a href="#reset">reset</a>() function will reset the context
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| 92 | and make it invalid.
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| 93 | <p> You can examine properties of the context with, e.g. <a href="#isValid">isValid</a>(),
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| 94 | <a href="#isSharing">isSharing</a>(), <a href="#initialized">initialized</a>(), <a href="#windowCreated">windowCreated</a>() and
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| 95 | <a href="#overlayTransparentColor">overlayTransparentColor</a>().
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| 96 | <p> If you're using double buffering you can swap the screen contents
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| 97 | with the off-screen buffer using <a href="#swapBuffers">swapBuffers</a>().
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| 98 | <p> Please note that QGLContext is not thread safe.
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| 99 | <p> <sup>*</sup> OpenGL is a trademark of Silicon Graphics, Inc. in the
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| 100 | United States and other countries.
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| 101 | <p> <p>See also <a href="graphics.html">Graphics Classes</a> and <a href="images.html">Image Processing Classes</a>.
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| 102 |
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| 103 | <hr><h2>Member Function Documentation</h2>
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| 104 | <h3 class=fn><a name="QGLContext"></a>QGLContext::QGLContext ( const <a href="qglformat.html">QGLFormat</a> & format, <a href="qpaintdevice.html">QPaintDevice</a> * device )
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| 105 | </h3>
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| 106 | Constructs an OpenGL context for the paint device <em>device</em>, which
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| 107 | can be a widget or a pixmap. The <em>format</em> specifies several
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| 108 | display options for the context.
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| 109 | <p> If the underlying OpenGL/Window system cannot satisfy all the
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| 110 | features requested in <em>format</em>, the nearest subset of features
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| 111 | will be used. After creation, the <a href="#format">format</a>() method will return the
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| 112 | actual format obtained.
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| 113 | <p> Note that after a QGLContext object has been constructed, <a href="#create">create()</a> must be called explicitly to create
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| 114 | the actual OpenGL context. The context will be <a href="#isValid">invalid</a> if it was not possible to obtain a GL context at
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| 115 | all.
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| 116 | <p> <p>See also <a href="#format">format</a>() and <a href="#isValid">isValid</a>().
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| 117 |
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| 118 | <h3 class=fn><a name="~QGLContext"></a>QGLContext::~QGLContext ()<tt> [virtual]</tt>
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| 119 | </h3>
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| 120 | Destroys the OpenGL context and frees its resources.
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| 121 |
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| 122 | <h3 class=fn>bool <a name="chooseContext"></a>QGLContext::chooseContext ( const <a href="qglcontext.html">QGLContext</a> * shareContext = 0 )<tt> [virtual protected]</tt>
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| 123 | </h3>
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| 124 |
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| 125 | <p> This semi-internal function is called by <a href="#create">create</a>(). It creates a
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| 126 | system-dependent OpenGL handle that matches the <a href="#format">format</a>() of <em>shareContext</em> as closely as possible.
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| 127 | <p> On Windows, it calls the virtual function <a href="#choosePixelFormat">choosePixelFormat</a>(),
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| 128 | which finds a matching pixel format identifier. On X11, it calls
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| 129 | the virtual function <a href="#chooseVisual">chooseVisual</a>() which finds an appropriate X
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| 130 | visual. On other platforms it may work differently.
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| 131 |
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| 132 | <h3 class=fn>void * <a name="chooseMacVisual"></a>QGLContext::chooseMacVisual ( GDHandle device )<tt> [virtual protected]</tt>
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| 133 | </h3>
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| 134 |
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| 135 | <p> <strong>Mac only</strong>: This virtual function tries to find a
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| 136 | visual that matches the format using the given <em>device</em> handle,
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| 137 | reducing the demands if the original request cannot be met.
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| 138 | <p> The algorithm for reducing the demands of the format is quite
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| 139 | simple-minded, so override this method in your subclass if your
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| 140 | application has specific requirements on visual selection.
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| 141 | <p> <p>See also <a href="#chooseContext">chooseContext</a>().
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| 142 |
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| 143 | <h3 class=fn>int <a name="choosePixelFormat"></a>QGLContext::choosePixelFormat ( void * dummyPfd, HDC pdc )<tt> [virtual protected]</tt>
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| 144 | </h3>
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| 145 | <strong>Win32 only</strong> This virtual function chooses a pixel
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| 146 | format that matches the OpenGL <a href="#setFormat">format</a>.
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| 147 | Reimplement this function in a subclass if you need a custom
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| 148 | context.
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| 149 | <p> <b>Warning:</b> The <em>dummyPfd</em> pointer and <em>pdc</em> are used as a <tt>PIXELFORMATDESCRIPTOR*</tt>. We use <tt>void</tt> to avoid using
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| 150 | Windows-specific types in our header files.
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| 151 | <p> <p>See also <a href="#chooseContext">chooseContext</a>().
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| 152 |
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| 153 | <h3 class=fn>void * <a name="chooseVisual"></a>QGLContext::chooseVisual ()<tt> [virtual protected]</tt>
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| 154 | </h3>
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| 155 | <strong>X11 only</strong>: This virtual function tries to find a
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| 156 | visual that matches the format, reducing the demands if the original
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| 157 | request cannot be met.
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| 158 | <p> The algorithm for reducing the demands of the format is quite
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| 159 | simple-minded, so override this method in your subclass if your
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| 160 | application has spcific requirements on visual selection.
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| 161 | <p> <p>See also <a href="#chooseContext">chooseContext</a>().
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| 162 |
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| 163 | <h3 class=fn>bool <a name="create"></a>QGLContext::create ( const <a href="qglcontext.html">QGLContext</a> * shareContext = 0 )<tt> [virtual]</tt>
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| 164 | </h3>
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| 165 | Creates the GL context. Returns TRUE if it was successful in
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| 166 | creating a valid GL rendering context on the paint device
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| 167 | specified in the constructor; otherwise returns FALSE (i.e. the
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| 168 | context is invalid).
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| 169 | <p> After successful creation, <a href="#format">format</a>() returns the set of features of
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| 170 | the created GL rendering context.
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| 171 | <p> If <em>shareContext</em> points to a valid QGLContext, this method will
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| 172 | try to establish OpenGL display list sharing between this context
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| 173 | and the <em>shareContext</em>. Note that this may fail if the two
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| 174 | contexts have different formats. Use <a href="#isSharing">isSharing</a>() to see if sharing
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| 175 | succeeded.
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| 176 | <p> <b>Warning:</b> Implementation note: initialization of C++ class
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| 177 | members usually takes place in the class constructor. QGLContext
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| 178 | is an exception because it must be simple to customize. The
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| 179 | virtual functions <a href="#chooseContext">chooseContext</a>() (and <a href="#chooseVisual">chooseVisual</a>() for X11) can
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| 180 | be reimplemented in a subclass to select a particular context. The
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| 181 | problem is that virtual functions are not properly called during
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| 182 | construction (even though this is correct C++) because C++
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| 183 | constructs class hierarchies from the bottom up. For this reason
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| 184 | we need a <a href="#create">create</a>() function.
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| 185 | <p> <p>See also <a href="#chooseContext">chooseContext</a>(), <a href="#format">format</a>(), and <a href="#isValid">isValid</a>().
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| 186 |
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| 187 | <h3 class=fn>const <a href="qglcontext.html">QGLContext</a> * <a name="currentContext"></a>QGLContext::currentContext ()<tt> [static]</tt>
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| 188 | </h3>
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| 189 |
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| 190 | <p> Returns the current context, i.e. the context to which any OpenGL
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| 191 | commands will currently be directed. Returns 0 if no context is
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| 192 | current.
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| 193 | <p> <p>See also <a href="#makeCurrent">makeCurrent</a>().
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| 194 |
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| 195 | <h3 class=fn><a href="qpaintdevice.html">QPaintDevice</a> * <a name="device"></a>QGLContext::device () const
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| 196 | </h3>
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| 197 |
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| 198 | <p> Returns the paint device set for this context.
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| 199 | <p> <p>See also <a href="#QGLContext">QGLContext::QGLContext</a>().
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| 200 |
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| 201 | <h3 class=fn>bool <a name="deviceIsPixmap"></a>QGLContext::deviceIsPixmap () const<tt> [protected]</tt>
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| 202 | </h3>
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| 203 |
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| 204 | <p> Returns TRUE if the paint device of this context is a pixmap;
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| 205 | otherwise returns FALSE.
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| 206 |
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| 207 | <h3 class=fn>void <a name="doneCurrent"></a>QGLContext::doneCurrent ()<tt> [virtual protected]</tt>
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| 208 | </h3>
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| 209 |
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| 210 | <p> Makes no GL context the current context. Normally, you do not need
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| 211 | to call this function; QGLContext calls it as necessary.
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| 212 |
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| 213 | <h3 class=fn><a href="qglformat.html">QGLFormat</a> <a name="format"></a>QGLContext::format () const
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| 214 | </h3>
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| 215 |
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| 216 | <p> Returns the frame buffer format that was obtained (this may be a
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| 217 | subset of what was requested).
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| 218 | <p> <p>See also <a href="#requestedFormat">requestedFormat</a>().
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| 219 |
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| 220 | <h3 class=fn>void <a name="generateFontDisplayLists"></a>QGLContext::generateFontDisplayLists ( const <a href="qfont.html">QFont</a> & font, int listBase )<tt> [protected]</tt>
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| 221 | </h3>
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| 222 |
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| 223 | <p> Generates a set of 256 display lists for the 256 first characters
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| 224 | in the font <em>font</em>. The first list will start at index <em>listBase</em>.
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| 225 | <p> <p>See also <a href="qglwidget.html#renderText">QGLWidget::renderText</a>().
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| 226 |
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| 227 | <h3 class=fn>bool <a name="initialized"></a>QGLContext::initialized () const<tt> [protected]</tt>
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| 228 | </h3>
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| 229 |
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| 230 | <p> Returns TRUE if this context has been initialized, i.e. if
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| 231 | <a href="qglwidget.html#initializeGL">QGLWidget::initializeGL</a>() has been performed on it; otherwise
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| 232 | returns FALSE.
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| 233 | <p> <p>See also <a href="#setInitialized">setInitialized</a>().
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| 234 |
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| 235 | <h3 class=fn>bool <a name="isSharing"></a>QGLContext::isSharing () const
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| 236 | </h3>
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| 237 |
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| 238 | <p> Returns TRUE if display list sharing with another context was
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| 239 | requested in the <a href="#create">create</a>() call and the GL system was able to
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| 240 | fulfill this request; otherwise returns FALSE. Note that display
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| 241 | list sharing might not be supported between contexts with
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| 242 | different formats.
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| 243 |
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| 244 | <h3 class=fn>bool <a name="isValid"></a>QGLContext::isValid () const
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| 245 | </h3>
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| 246 |
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| 247 | <p> Returns TRUE if a GL rendering context has been successfully
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| 248 | created; otherwise returns FALSE.
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| 249 |
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| 250 | <h3 class=fn>void <a name="makeCurrent"></a>QGLContext::makeCurrent ()<tt> [virtual]</tt>
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| 251 | </h3>
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| 252 |
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| 253 | <p> Makes this context the current OpenGL rendering context. All GL
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| 254 | functions you call operate on this context until another context
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| 255 | is made current.
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| 256 | <p> In some very rare cases the underlying call may fail. If this
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| 257 | occurs an error message is output to stderr.
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| 258 |
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| 259 | <h3 class=fn><a href="qcolor.html">QColor</a> <a name="overlayTransparentColor"></a>QGLContext::overlayTransparentColor () const
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| 260 | </h3>
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| 261 |
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| 262 | <p> If this context is a valid context in an overlay plane, returns
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| 263 | the plane's transparent color. Otherwise returns an <a href="qcolor.html#isValid">invalid</a> color.
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| 264 | <p> The returned color's <a href="qcolor.html#pixel">pixel</a> value is
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| 265 | the index of the transparent color in the colormap of the overlay
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| 266 | plane. (Naturally, the color's RGB values are meaningless.)
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| 267 | <p> The returned <a href="qcolor.html">QColor</a> object will generally work as expected only
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| 268 | when passed as the argument to <a href="qglwidget.html#qglColor">QGLWidget::qglColor</a>() or
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| 269 | <a href="qglwidget.html#qglClearColor">QGLWidget::qglClearColor</a>(). Under certain circumstances it can
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| 270 | also be used to draw transparent graphics with a <a href="qpainter.html">QPainter</a>. See the
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| 271 | examples/opengl/overlay_x11 example for details.
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| 272 |
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| 273 | <h3 class=fn><a href="qglformat.html">QGLFormat</a> <a name="requestedFormat"></a>QGLContext::requestedFormat () const
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| 274 | </h3>
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| 275 |
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| 276 | <p> Returns the frame buffer format that was originally requested in
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| 277 | the constructor or <a href="#setFormat">setFormat</a>().
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| 278 | <p> <p>See also <a href="#format">format</a>().
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| 279 |
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| 280 | <h3 class=fn>void <a name="reset"></a>QGLContext::reset ()<tt> [virtual]</tt>
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| 281 | </h3>
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| 282 |
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| 283 | <p> Resets the context and makes it invalid.
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| 284 | <p> <p>See also <a href="#create">create</a>() and <a href="#isValid">isValid</a>().
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| 285 |
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| 286 | <h3 class=fn>void <a name="setFormat"></a>QGLContext::setFormat ( const <a href="qglformat.html">QGLFormat</a> & format )<tt> [virtual]</tt>
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| 287 | </h3>
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| 288 | Sets a <em>format</em> for this context. The context is <a href="#reset">reset</a>.
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| 289 | <p> Call <a href="#create">create</a>() to create a new GL context that tries to match the
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| 290 | new format.
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| 291 | <p> <pre>
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| 292 | QGLContext *cx;
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| 293 | // ...
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| 294 | <a href="qglformat.html">QGLFormat</a> f;
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| 295 | f.<a href="qglformat.html#setStereo">setStereo</a>( TRUE );
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| 296 | cx-><a href="#setFormat">setFormat</a>( f );
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| 297 | if ( !cx-><a href="#create">create</a>() )
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| 298 | exit(); // no OpenGL support, or cannot render on the specified paintdevice
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| 299 | if ( !cx-><a href="#format">format</a>().stereo() )
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| 300 | exit(); // could not create stereo context
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| 301 | </pre>
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| 302 |
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| 303 | <p> <p>See also <a href="#format">format</a>(), <a href="#reset">reset</a>(), and <a href="#create">create</a>().
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| 304 |
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| 305 | <h3 class=fn>void <a name="setInitialized"></a>QGLContext::setInitialized ( bool on )<tt> [protected]</tt>
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| 306 | </h3>
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| 307 |
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| 308 | <p> If <em>on</em> is TRUE the context has been initialized, i.e.
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| 309 | <a href="#setInitialized">QGLContext::setInitialized</a>() has been called on it. If <em>on</em> is
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| 310 | FALSE the context has not been initialized.
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| 311 | <p> <p>See also <a href="#initialized">initialized</a>().
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| 312 |
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| 313 | <h3 class=fn>void <a name="setWindowCreated"></a>QGLContext::setWindowCreated ( bool on )<tt> [protected]</tt>
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| 314 | </h3>
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| 315 |
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| 316 | <p> If <em>on</em> is TRUE the context has had a window created for it. If
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| 317 | <em>on</em> is FALSE no window has been created for the context.
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| 318 | <p> <p>See also <a href="#windowCreated">windowCreated</a>().
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| 319 |
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| 320 | <h3 class=fn>void <a name="swapBuffers"></a>QGLContext::swapBuffers () const<tt> [virtual]</tt>
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| 321 | </h3>
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| 322 |
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| 323 | <p> Swaps the screen contents with an off-screen buffer. Only works if
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| 324 | the context is in double buffer mode.
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| 325 | <p> <p>See also <a href="qglformat.html#setDoubleBuffer">QGLFormat::setDoubleBuffer</a>().
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| 326 |
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| 327 | <h3 class=fn>bool <a name="windowCreated"></a>QGLContext::windowCreated () const<tt> [protected]</tt>
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| 328 | </h3>
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| 329 |
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| 330 | <p> Returns TRUE if a window has been created for this context;
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| 331 | otherwise returns FALSE.
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| 332 | <p> <p>See also <a href="#setWindowCreated">setWindowCreated</a>().
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| 333 |
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| 334 | <!-- eof -->
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| 335 | <hr><p>
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| 336 | This file is part of the <a href="index.html">Qt toolkit</a>.
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| 337 | Copyright © 1995-2007
|
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| 338 | <a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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| 339 | <table width=100% cellspacing=0 border=0><tr>
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| 340 | <td>Copyright © 2007
|
|---|
| 341 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
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| 342 | <td align=right><div align=right>Qt 3.3.8</div>
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| 343 | </table></div></address></body>
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| 344 | </html>
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