#[repr(transparent)]pub struct GLArea { /* private fields */ }
Expand description
GLArea
is a widget that allows drawing with OpenGL.
GLArea
sets up its own gdk::GLContext
, and creates a custom
GL framebuffer that the widget will do GL rendering onto. It also ensures
that this framebuffer is the default GL rendering target when rendering.
In order to draw, you have to connect to the signal::GLArea::render
signal, or subclass GLArea
and override the GtkGLAreaClass.render
virtual function.
The GLArea
widget ensures that the gdk::GLContext
is associated with
the widget’s drawing area, and it is kept updated when the size and
position of the drawing area changes.
Drawing with GtkGLArea
The simplest way to draw using OpenGL commands in a GLArea
is to
create a widget instance and connect to the signal::GLArea::render
signal:
The render()
function will be called when the GLArea
is ready
for you to draw its content:
⚠️ The following code is in c ⚠️
static gboolean
render (GtkGLArea *area, GdkGLContext *context)
{
// inside this function it's safe to use GL; the given
// GdkGLContext has been made current to the drawable
// surface used by the `GtkGLArea` and the viewport has
// already been set to be the size of the allocation
// we can start by clearing the buffer
glClearColor (0, 0, 0, 0);
glClear (GL_COLOR_BUFFER_BIT);
// draw your object
// draw_an_object ();
// we completed our drawing; the draw commands will be
// flushed at the end of the signal emission chain, and
// the buffers will be drawn on the window
return TRUE;
}
void setup_glarea (void)
{
// create a GtkGLArea instance
GtkWidget *gl_area = gtk_gl_area_new ();
// connect to the "render" signal
g_signal_connect (gl_area, "render", G_CALLBACK (render), NULL);
}
If you need to initialize OpenGL state, e.g. buffer objects or
shaders, you should use the signal::Widget::realize
signal;
you can use the signal::Widget::unrealize
signal to clean up.
Since the gdk::GLContext
creation and initialization may fail, you
will need to check for errors, using GLAreaExt::error()
.
An example of how to safely initialize the GL state is:
⚠️ The following code is in c ⚠️
static void
on_realize (GtkGLarea *area)
{
// We need to make the context current if we want to
// call GL API
gtk_gl_area_make_current (area);
// If there were errors during the initialization or
// when trying to make the context current, this
// function will return a GError for you to catch
if (gtk_gl_area_get_error (area) != NULL)
return;
// You can also use gtk_gl_area_set_error() in order
// to show eventual initialization errors on the
// GtkGLArea widget itself
GError *internal_error = NULL;
init_buffer_objects (&error);
if (error != NULL)
{
gtk_gl_area_set_error (area, error);
g_error_free (error);
return;
}
init_shaders (&error);
if (error != NULL)
{
gtk_gl_area_set_error (area, error);
g_error_free (error);
return;
}
}
If you need to change the options for creating the gdk::GLContext
you should use the signal::GLArea::create-context
signal.
Implements
GLAreaExt
, WidgetExt
, glib::ObjectExt
, AccessibleExt
, BuildableExt
, ConstraintTargetExt
, WidgetExtManual
, AccessibleExtManual
Implementations§
Trait Implementations§
source§impl<T: GLAreaImpl> IsSubclassable<T> for GLArea
impl<T: GLAreaImpl> IsSubclassable<T> for GLArea
source§fn class_init(class: &mut Class<Self>)
fn class_init(class: &mut Class<Self>)
source§fn instance_init(instance: &mut InitializingObject<T>)
fn instance_init(instance: &mut InitializingObject<T>)
source§impl Ord for GLArea
impl Ord for GLArea
source§impl<OT: ObjectType> PartialEq<OT> for GLArea
impl<OT: ObjectType> PartialEq<OT> for GLArea
source§impl<OT: ObjectType> PartialOrd<OT> for GLArea
impl<OT: ObjectType> PartialOrd<OT> for GLArea
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moresource§impl StaticType for GLArea
impl StaticType for GLArea
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for GLArea
impl IsA<Accessible> for GLArea
impl IsA<Buildable> for GLArea
impl IsA<ConstraintTarget> for GLArea
impl IsA<Widget> for GLArea
Auto Trait Implementations§
impl RefUnwindSafe for GLArea
impl !Send for GLArea
impl !Sync for GLArea
impl Unpin for GLArea
impl UnwindSafe for GLArea
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impl<O> AccessibleExtManual for Owhere
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