Gets the allowed APIs set via gdk.glcontext.GLContext.setAllowedApis.
Gets the API currently in use.
Retrieves whether the context is doing extra validations and runtime checking.
Retrieves the display the context is created for
Retrieves whether the context is forward-compatible.
Retrieves required OpenGL version set as a requirement for the context realization. It will not change even if a greater OpenGL version is supported and used after the context is realized. See gdk.glcontext.GLContext.getVersion for the real version in use.
Used to retrieves the gdk.glcontext.GLContext that this context share data with.
Retrieves the surface used by the context.
Checks whether the context is using an OpenGL or OpenGL ES profile.
Retrieves the OpenGL version of the context.
Whether the gdk.glcontext.GLContext is in legacy mode or not.
Checks if the two GL contexts can share resources.
Makes the context the current one.
Realizes the given gdk.glcontext.GLContext.
Sets the allowed APIs. When gdk.glcontext.GLContext.realize is called, only the allowed APIs will be tried. If you set this to 0, realizing will always fail.
Sets whether the gdk.glcontext.GLContext should perform extra validations and runtime checking.
Sets whether the gdk.glcontext.GLContext should be forward-compatible.
Sets the major and minor version of OpenGL to request.
Requests that GDK create an OpenGL ES context instead of an OpenGL one.
Clears the current gdk.glcontext.GLContext.
Retrieves the current gdk.glcontext.GLContext.
Indicates that you are beginning the process of redrawing region on the context's surface.
Ends a drawing operation started with gdk.draw_context.DrawContext.beginFrame.
Retrieves the gdk.display.Display the context is created for
Retrieves the region that is currently being repainted.
Retrieves the surface that context is bound to.
Returns true if context is in the process of drawing to its surface.
gdk.glcontext.GLContext is an object representing a platform-specific OpenGL draw context.
gdk.glcontext.GLContexts are created for a surface using gdk.surface.Surface.createGlContext, and the context will match the characteristics of the surface.
A gdk.glcontext.GLContext is not tied to any particular normal framebuffer. For instance, it cannot draw to the surface back buffer. The GDK repaint system is in full control of the painting to that. Instead, you can create render buffers or textures and use func@cairo_draw_from_gl in the draw function of your widget to draw them. Then GDK will handle the integration of your rendering with that of other widgets.
Support for gdk.glcontext.GLContext is platform-specific and context creation can fail, returning null context.
A gdk.glcontext.GLContext has to be made "current" in order to start using it, otherwise any OpenGL call will be ignored.
Creating a new OpenGL context
In order to create a new gdk.glcontext.GLContext instance you need a gdk.surface.Surface, which you typically get during the realize call of a widget.
A gdk.glcontext.GLContext is not realized until either gdk.glcontext.GLContext.makeCurrent or gdk.glcontext.GLContext.realize is called. It is possible to specify details of the GL context like the OpenGL version to be used, or whether the GL context should have extra state validation enabled after calling gdk.surface.Surface.createGlContext by calling gdk.glcontext.GLContext.realize. If the realization fails you have the option to change the settings of the gdk.glcontext.GLContext and try again.
Using a GdkGLContext
You will need to make the gdk.glcontext.GLContext the current context before issuing OpenGL calls; the system sends OpenGL commands to whichever context is current. It is possible to have multiple contexts, so you always need to ensure that the one which you want to draw with is the current one before issuing commands:
You can now perform your drawing using OpenGL commands.
You can check which gdk.glcontext.GLContext is the current one by using gdk.glcontext.GLContext.getCurrent; you can also unset any gdk.glcontext.GLContext that is currently set by calling gdk.glcontext.GLContext.clearCurrent.