tg_windows5.12.6/Telegram/lib_ui/ui/gl/gl_surface.h

// This file is part of Desktop App Toolkit,
// a set of libraries for developing nice desktop applications.
//
// For license and copyright information please follow this link:
// https://github.com/desktop-app/legal/blob/master/LEGAL
//
#pragma once

#include "ui/gl/gl_detection.h"

#include <QtGui/QOpenGLFunctions>

class Painter;
class QOpenGLWidget;

namespace Ui {
class RpWidgetWrap;
} // namespace Ui

namespace Ui::GL {

class Renderer {
public:
	virtual void init(
		not_null<QOpenGLWidget*> widget,
		QOpenGLFunctions &f) {
	}

	virtual void deinit(
		not_null<QOpenGLWidget*> widget,
		QOpenGLFunctions *f) {
	}

	virtual void resize(
		not_null<QOpenGLWidget*> widget,
		QOpenGLFunctions &f,
		int w,
		int h) {
	}

	virtual void paint(
		not_null<QOpenGLWidget*> widget,
		QOpenGLFunctions &f);

	[[nodiscard]] virtual std::optional<QColor> clearColor() {
		return std::nullopt;
	}

	virtual void paintFallback(
		Painter &&p,
		const QRegion &clip,
		Backend backend) {
	}

	virtual ~Renderer() = default;
};

struct ChosenRenderer {
	std::unique_ptr<Renderer> renderer;
	Backend backend = Backend::Raster;
};

[[nodiscard]] std::unique_ptr<RpWidgetWrap> CreateSurface(
	Fn<ChosenRenderer(Capabilities)> chooseRenderer);

[[nodiscard]] std::unique_ptr<RpWidgetWrap> CreateSurface(
	QWidget *parent,
	ChosenRenderer chosen);

} // namespace Ui::GL