1wxGLContext(3)             Erlang Module Definition             wxGLContext(3)
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NAME

6       wxGLContext - Functions for wxGLContext class
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DESCRIPTION

9       An  instance  of  a wxGLContext represents the state of an OpenGL state
10       machine and the connection between OpenGL and the system.
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12       The OpenGL state includes everything that can be set  with  the  OpenGL
13       API:  colors,  rendering  variables,  buffer data ids, texture objects,
14       etc. It is possible to have multiple rendering  contexts  share  buffer
15       data  and  textures. This feature is specially useful when the applica‐
16       tion use multiple threads for updating data  into  the  memory  of  the
17       graphics card.
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19       Whether  one  only  rendering context is used with or bound to multiple
20       output windows or if each window has its own bound context is a  devel‐
21       oper decision. It is important to take into account that GPU makers may
22       set different pointers to the same OGL function for different contexts.
23       The way these pointers are retrieved from the OGL driver should be used
24       again for each new context.
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26       Binding (making current) a rendering context with another instance of a
27       wxGLCanvas  however  works  only  if the both wxGLCanvas instances were
28       created with the same attributes.
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30       OpenGL version 3 introduced a new type of  specification  profile,  the
31       modern core profile. The old compatibility profile maintains all legacy
32       features. Since wxWidgets 3.1.0 you can choose the type of context  and
33       even  ask  for  a specified OGL version number. However, its advised to
34       use only core profile as  the  compatibility  profile  may  run  a  bit
35       slower.
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37       OpenGL core profile specification defines several flags at context cre‐
38       ation that determine not only the type of context but  also  some  fea‐
39       tures. Some of these flags can be set in the list of attributes used at
40       wxGLCanvas ctor. But since wxWidgets 3.1.0 it is strongly encouraged to
41       use  the  new mechanism: setting the context attributes with a wxGLCon‐
42       textAttrs (not implemented in wx) object and the canvas attributes with
43       a wxGLAttributes (not implemented in wx) object.
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45       The  best way of knowing if your OpenGL environment supports a specific
46       type of  context  is  creating  a  wxGLContext  instance  and  checking
47       wxGLContext::IsOK()  (not implemented in wx). If it returns false, then
48       simply delete that instance and create a new one with other attributes.
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50       wxHAS_OPENGL_ES is defined on platforms that only have this implementa‐
51       tion  available (e.g. the iPhone) and don't support the full specifica‐
52       tion.
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54       See: wxGLCanvas, wxGLContextAttrs  (not  implemented  in  wx),  wxGLAt‐
55       tributes (not implemented in wx)
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57       wxWidgets docs: wxGLContext
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DATA TYPES

60       wxGLContext() = wx:wx_object()
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EXPORTS

63       new(Win) -> wxGLContext()
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65              Types:
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67                 Win = wxGLCanvas:wxGLCanvas()
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69       new(Win, Options :: [Option]) -> wxGLContext()
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71              Types:
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73                 Win = wxGLCanvas:wxGLCanvas()
74                 Option = {other, wxGLContext()}
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76              Constructor.
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78       setCurrent(This, Win) -> boolean()
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80              Types:
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82                 This = wxGLContext()
83                 Win = wxGLCanvas:wxGLCanvas()
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85              Makes  the  OpenGL  state  that is represented by this rendering
86              context current with the wxGLCanvas win.
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88              Note: win can be a different wxGLCanvas window than the one that
89              was  passed  to the constructor of this rendering context. If RC
90              is an object of type  wxGLContext,  the  statements  "RC.SetCur‐
91              rent(win);"   and   "win.SetCurrent(RC);"  are  equivalent,  see
92              wxGLCanvas:setCurrent/2.
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94       destroy(This :: wxGLContext()) -> ok
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96              Destroys the object.
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100wxWidgets team.                    wx 2.1.4                     wxGLContext(3)
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