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// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef INKSCAPE_UI_WIDGET_OPTGLAREA_H
#define INKSCAPE_UI_WIDGET_OPTGLAREA_H
#include <gtkmm.h>
#include <epoxy/gl.h>
namespace Cairo {
class Context;
}
namespace Inkscape {
namespace UI {
namespace Widget {
/**
* A widget that can dynamically switch between a Gtk::DrawingArea and a Gtk::GLArea.
* Based on the GTK source code for both widgets.
*/
class OptGLArea : public Gtk::DrawingArea
{
public:
OptGLArea();
/**
* Set whether OpenGL is enabled. Initially it is disabled. Upon enabling it,
* create_context will be called as soon as the widget is realized. If
* context creation fails, OpenGL will be disabled again.
*/
void set_opengl_enabled(bool);
bool get_opengl_enabled() const { return opengl_enabled; }
/**
* Call before doing any OpenGL operations to make the context current.
* Automatically done before calling opengl_render.
*/
void make_current();
/**
* Call before rendering to the widget to bind the widget's framebuffer.
*/
void bind_framebuffer() const;
protected:
void on_realize() override;
void on_unrealize() override;
void on_size_allocate(Gtk::Allocation&) override;
bool on_draw(const Cairo::RefPtr<Cairo::Context>&) final;
/**
* Reimplement to create the desired OpenGL context. Return nullptr on error.
*/
virtual Glib::RefPtr<Gdk::GLContext> create_context() = 0;
/**
* Reimplement to render the widget. The Cairo context is only for when OpenGL is disabled.
*/
virtual void paint_widget(const Cairo::RefPtr<Cairo::Context>&) {}
private:
void init_opengl();
void create_framebuffer();
void delete_framebuffer();
void resize_framebuffer() const;
Glib::RefPtr<Gdk::GLContext> context;
bool opengl_enabled;
bool need_resize;
GLuint framebuffer;
GLuint renderbuffer;
GLuint stencilbuffer;
};
} // namespace Widget
} // namespace UI
} // namespace Inkscape
#endif // INKSCAPE_UI_WIDGET_OPTGLAREA_H
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