/////////////////////////////////////////////////////////////////////////////
// Name: glcanvas.h
-// Purpose: interface of wxGLContext
+// Purpose: interface of wxGLContext and wxGLCanvas
// Author: wxWidgets team
// RCS-ID: $Id$
-// Licence: wxWindows license
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
/**
@class wxGLContext
- An instance of a wxGLContext represents the state of an OpenGL state machine
- and the connection between OpenGL and the system.
+ An instance of a wxGLContext represents the state of an OpenGL state
+ machine and the connection between OpenGL and the system.
The OpenGL state includes everything that can be set with the OpenGL API:
- colors, rendering variables, display lists, texture objects, etc.
- Although it is possible to have multiple rendering contexts share display lists
- in order to save resources,
- this method is hardly used today any more, because display lists are only a
- tiny fraction of the overall state.
+ colors, rendering variables, display lists, texture objects, etc. Although
+ it is possible to have multiple rendering contexts share display lists in
+ order to save resources, this method is hardly used today any more, because
+ display lists are only a tiny fraction of the overall state.
Therefore, one rendering context is usually used with or bound to multiple
- output windows in turn,
- so that the application has access to the complete and identical state while
- rendering into each window.
+ output windows in turn, so that the application has access to the complete
+ and identical state while rendering into each window.
Binding (making current) a rendering context with another instance of a
- wxGLCanvas however works only
- if the other wxGLCanvas was created with the same attributes as the wxGLCanvas
- from which the wxGLContext
- was initialized. (This applies to sharing display lists among contexts
+ wxGLCanvas however works only if the other wxGLCanvas was created with the
+ same attributes as the wxGLCanvas from which the wxGLContext was
+ initialized. (This applies to sharing display lists among contexts
analogously.)
- 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.
+ 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.
+
+ wxHAS_OPENGL_ES is defined on platforms that only have this implementation
+ available (eg the iPhone) und don't support the full specification.
@library{wxgl}
@category{gl}
Constructor.
@param win
- The canvas that is used to initialize this context. This parameter is
- needed only temporarily,
- and the caller may do anything with it (e.g. destroy the window) after the
- constructor returned.
- It will be possible to bind (make current) this context to any other
- wxGLCanvas that has been created
- with equivalent attributes as win.
+ The canvas that is used to initialize this context. This parameter
+ is needed only temporarily, and the caller may do anything with it
+ (e.g. destroy the window) after the constructor returned. @n
+ It will be possible to bind (make current) this context to any
+ other wxGLCanvas that has been created with equivalent attributes
+ as win.
@param other
- Context to share display lists with or @NULL (the default) for no sharing.
+ Context to share display lists with or @NULL (the default) for no
+ sharing.
*/
wxGLContext(wxGLCanvas* win, const wxGLContext* other = NULL);
/**
- Makes the OpenGL state that is represented by this rendering context current
- with the wxGLCanvas @e win.
- Note that @a win can be a different wxGLCanvas window than the one that was
- passed to the constructor of this rendering context.
- If @e RC is an object of type wxGLContext, the statements @e
- RC.SetCurrent(win); and @e win.SetCurrent(RC); are equivalent,
- see wxGLCanvas::SetCurrent.
+ Makes the OpenGL state that is represented by this rendering context
+ current with the wxGLCanvas @e win.
+
+ @note @a win can be a different wxGLCanvas window than the one that was
+ passed to the constructor of this rendering context. If @e RC is
+ an object of type wxGLContext, the statements
+ @e "RC.SetCurrent(win);" and @e "win.SetCurrent(RC);" are
+ equivalent, see wxGLCanvas::SetCurrent().
*/
virtual bool SetCurrent(const wxGLCanvas& win) const;
};
/**
+ @anchor wxGL_FLAGS
+
Constants for use with wxGLCanvas.
- Notice that not all implementation support options such as stereo,
- auxiliary buffers, alpha channel, and accumulator buffer, use
- wxGLCanvas::IsDisplaySupported() to check for individual attributes support.
+ @note Not all implementations support options such as stereo, auxiliary
+ buffers, alpha channel, and accumulator buffer, use
+ wxGLCanvas::IsDisplaySupported() to check for individual attributes
+ support.
*/
enum
{
- /// Use true color palette (on if no attributes at all specified).
+ /// Use true color (the default if no attributes at all are specified);
+ /// do not use a palette.
WX_GL_RGBA = 1,
/// Specifies the number of bits for buffer if not WX_GL_RGBA.
@class wxGLCanvas
wxGLCanvas is a class for displaying OpenGL graphics. It is always used in
- conjunction with wxGLContext as the context can only be
- be made current (i.e. active for the OpenGL commands) when it is associated to
- a wxGLCanvas.
-
- More precisely, you first need to create a wxGLCanvas window and then create an
- instance of a wxGLContext that is initialized with this
- wxGLCanvas and then later use either wxGLCanvas::SetCurrent
- with the instance of the wxGLContext or
- wxGLContext::SetCurrent with the instance of
- the wxGLCanvas (which might be not the same as was used
- for the creation of the context) to bind the OpenGL state that is represented
- by the rendering context to the canvas, and then finally call
- wxGLCanvas::SwapBuffers to swap the buffers of
- the OpenGL canvas and thus show your current output.
-
- Notice that previous versions of wxWidgets used to implicitly create a
- wxGLContext inside wxGLCanvas itself. This is still supported in the current
- version but is deprecated now and will be removed in the future, please update
- your code to create the rendering contexts explicitly.
-
- To set up the attributes for the canvas (number of bits for the depth buffer,
- number of bits for the stencil buffer and so on) you should set up the correct
- values of
- the @e attribList parameter. The values that should be set up and their
- meanings will be described below.
-
- Notice that OpenGL is not enabled by default. To switch it on, you need to edit
- setup.h under Windows and set @c wxUSE_GLCANVAS to 1 (you may also need
- to have to add @c opengl32.lib and @c glu32.lib to the list of libraries
- your program is linked with). On Unix, pass @c --with-opengl to configure.
+ conjunction with wxGLContext as the context can only be made current (i.e.
+ active for the OpenGL commands) when it is associated to a wxGLCanvas.
+
+ More precisely, you first need to create a wxGLCanvas window and then
+ create an instance of a wxGLContext that is initialized with this
+ wxGLCanvas and then later use either SetCurrent() with the instance of the
+ wxGLContext or wxGLContext::SetCurrent() with the instance of the
+ wxGLCanvas (which might be not the same as was used for the creation of the
+ context) to bind the OpenGL state that is represented by the rendering
+ context to the canvas, and then finally call SwapBuffers() to swap the
+ buffers of the OpenGL canvas and thus show your current output.
+
+ Notice that versions of wxWidgets previous to 2.9 used to implicitly create a
+ wxGLContext inside wxGLCanvas itself. This is still supported in the
+ current version but is deprecated now and will be removed in the future,
+ please update your code to create the rendering contexts explicitly.
+
+ To set up the attributes for the canvas (number of bits for the depth
+ buffer, number of bits for the stencil buffer and so on) you should set up
+ the correct values of the @e attribList parameter. The values that should
+ be set up and their meanings will be described below.
+
+ @note
+ On those platforms which use a configure script (e.g. Linux and Mac OS)
+ OpenGL support is automatically enabled if the relative headers and
+ libraries are found.
+ To switch it on under the other platforms (e.g. Windows), you need to edit
+ the @c setup.h file and set @c wxUSE_GLCANVAS to @c 1 and then also pass
+ @c USE_OPENGL=1 to the make utility. You may also need to add @c opengl32.lib
+ and @c glu32.lib to the list of the libraries your program is linked with.
@library{wxgl}
@category{gl}
{
public:
/**
- Creates a window with the given parameters. Notice that you need to create and
- use a wxGLContext to output to this window.
- If
+ Creates a window with the given parameters. Notice that you need to
+ create and use a wxGLContext to output to this window.
- @param attribList is not specified, double buffered RGBA mode is used.
+ If @a attribList is not specified, double buffered RGBA mode is used.
- parent
+ @param parent
Pointer to a parent window.
@param id
Window identifier. If -1, will automatically create an identifier.
@param pos
Window position. wxDefaultPosition is (-1, -1) which indicates that
- wxWidgets
- should generate a default position for the window.
+ wxWidgets should generate a default position for the window.
@param size
- Window size. wxDefaultSize is (-1, -1) which indicates that wxWidgets should
- generate a default size for the window. If no suitable size can be found,
- the window will be sized to 20x20 pixels so that the window is visible but obviously not correctly sized.
+ Window size. wxDefaultSize is (-1, -1) which indicates that
+ wxWidgets should generate a default size for the window. If no
+ suitable size can be found, the window will be sized to 20x20
+ pixels so that the window is visible but obviously not correctly
+ sized.
@param style
Window style.
@param name
@param attribList
Array of integers. With this parameter you can set the device
context attributes associated to this window. This array is
- zero-terminated: it should be set up with constants described in
- the table above. If a constant should be followed by a value, put
- it in the next array position. For example, the WX_GL_DEPTH_SIZE
- should be followed by the value that indicates the number of bits
- for the depth buffer, e.g:
+ zero-terminated: it should be set up using @ref wxGL_FLAGS
+ constants. If a constant should be followed by a value, put it in
+ the next array position. For example, WX_GL_DEPTH_SIZE should be
+ followed by the value that indicates the number of bits for the
+ depth buffer, e.g:
@code
attribList[n++] = WX_GL_DEPTH_SIZE;
attribList[n++] = 32;
attribList[n] = 0; // terminate the list
@endcode
If the attribute list is not specified at all, i.e. if this
- parameter is @NULL, the default attributes including @c WX_GL_RGBA
- and @c WX_GL_DOUBLEBUFFER are used. But notice that if you do
- specify some attributes you also need to explicitly include these
- two default attributes in the list if you need them.
+ parameter is @NULL, the default attributes including WX_GL_RGBA and
+ WX_GL_DOUBLEBUFFER are used. But notice that if you do specify some
+ attributes you also need to explicitly include these two default
+ attributes in the list if you need them.
@param palette
- Palette for indexed colour (i.e. non WX_GL_RGBA) mode.
- Ignored under most platforms.
+ Palette for indexed colour (i.e. non WX_GL_RGBA) mode. Ignored
+ under most platforms.
*/
wxGLCanvas(wxWindow* parent, wxWindowID id = wxID_ANY,
const int* attribList = NULL,
/**
Determines if a canvas having the specified attributes is available.
- Returns @true if attributes are supported.
@param attribList
- See attribList for wxGLCanvas().
+ See @a attribList for wxGLCanvas().
+
+ @return @true if attributes are supported.
+ */
+ static bool IsDisplaySupported(const int* attribList);
+
+ /**
+ Returns true if the extension with given name is supported
+
+ Notice that while this function is implemented for all of GLX, WGL and
+ AGL the extensions names are usually not the same for different
+ platforms and so the code using it still usually uses conditional
+ compilation.
*/
- static bool IsDisplaySupported(const int* attribList = NULL);
+ static bool IsExtensionSupported(const char *extension);
/**
- Sets the current colour for this window (using @c glcolor3f()), using the
- wxWidgets colour database to find a named colour.
+ Sets the current colour for this window (using @c glcolor3f()), using
+ the wxWidgets colour database to find a named colour.
*/
bool SetColour(const wxString& colour);
/**
- Makes the OpenGL state that is represented by the OpenGL rendering context
- @a context current, i.e. it will be used by all subsequent OpenGL calls.
- This is equivalent to wxGLContext::SetCurrent
- called with this window as parameter.
- Note that this function may only be called when the window is shown on screen,
- in particular it can't usually be called from the constructor as the window
- isn't yet shown at this moment.
- Returns @false if an error occurred.
+ Makes the OpenGL state that is represented by the OpenGL rendering
+ context @a context current, i.e. it will be used by all subsequent
+ OpenGL calls.
+
+ This is equivalent to wxGLContext::SetCurrent() called with this window
+ as parameter.
+
+ @note This function may only be called when the window is shown on
+ screen, in particular it can't usually be called from the
+ constructor as the window isn't yet shown at this moment.
+
+ @return @false if an error occurred.
*/
- bool SetCurrent(const wxGLContext context);
+ bool SetCurrent(const wxGLContext& context) const;
/**
- Swaps the double-buffer of this window, making the back-buffer the front-buffer
- and vice versa,
- so that the output of the previous OpenGL commands is displayed on the window.
- Returns @false if an error occurred.
+ Swaps the double-buffer of this window, making the back-buffer the
+ front-buffer and vice versa, so that the output of the previous OpenGL
+ commands is displayed on the window.
+
+ @return @false if an error occurred.
*/
virtual bool SwapBuffers();
};
-
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