b67a86d574
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41905 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
57 lines
2.6 KiB
TeX
57 lines
2.6 KiB
TeX
\section{\class{wxGLContext}}\label{wxglcontext}
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An instance of a wxGLContext represents the state of an OpenGL state machine and the connection between OpenGL and the system.
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The OpenGL state includes everything that can be set with the OpenGL API: colors, rendering variables, display lists, texture objects, etc.
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Although it is possible to have multiple rendering contexts share display lists in order to save resources,
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this method is hardly used today any more, because display lists are only a tiny fraction of the overall state.
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Therefore, one rendering context is usually used with or bound to multiple output windows in turn,
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so that the application has access to the \emph{complete and identical} state while rendering into each window.
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Binding (making current) a rendering context with another instance of a wxGLCanvas however works only
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if the other wxGLCanvas was created with the same attributes as the wxGLCanvas from which the wxGLContext
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was initialized. (This applies to sharing display lists among contexts analogously.)
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Note that some wxGLContext features are extremely platform-specific - its best to check your native platform's glcanvas header (on windows include/wx/msw/glcanvas.h) to see what features your native platform provides.
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\wxheading{Derived from}
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\helpref{wxObject}{wxobject}
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\wxheading{Include files}
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<wx/glcanvas.h>
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\wxheading{See also}
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\helpref{wxGLCanvas}{wxglcanvas}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxGLContext::wxGLContext}\label{wxglcontextconstr}
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\func{ }{wxGLContext}{ \param{wxGLCanvas*}{ win}, \param{const wxGLContext*}{ other=NULL} }
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Constructor.
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\docparam{win}{The canvas that is used to initialize this context. This parameter is needed only temporarily,
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and the caller may do anything with it (e.g. destroy the window) after the constructor returned.
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It will be possible to bind (make current) this context to any other wxGLCanvas that has been created
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with equivalent attributes as {\it win}.}
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\docparam{other}{Context to share display lists with or NULL (the default) for no sharing.}
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\membersection{wxGLContext::SetCurrent}\label{wxglcontextsetcurrent}
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\func{void}{SetCurrent}{\param{const wxGLCanvas&}{ win}}
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Makes the OpenGL state that is represented by this rendering context current with the wxGLCanvas {\it win}.
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Note that {\it win} can be a different wxGLCanvas window than the one that was passed to the constructor of this rendering context.
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If { \it RC } is an object of type wxGLContext, the statements {\it RC.SetCurrent(win);} and {\it win.SetCurrent(RC);} are equivalent,
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see \helpref{wxGLCanvas::SetCurrent}{wxglcanvassetcurrentrc}.
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