/*************************************************************************/
/*  gl_manager_osx.h                                                     */
/*************************************************************************/
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
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/*************************************************************************/

#ifndef GL_MANAGER_OSX_H
#define GL_MANAGER_OSX_H

#if defined(OSX_ENABLED) && defined(GLES3_ENABLED)

#include "core/error/error_list.h"
#include "core/os/os.h"
#include "core/templates/local_vector.h"
#include "servers/display_server.h"

#include <AppKit/AppKit.h>
#include <ApplicationServices/ApplicationServices.h>
#include <CoreVideo/CoreVideo.h>

class GLManager_OSX {
public:
	enum ContextType {
		GLES_3_0_COMPATIBLE,
	};

private:
	struct GLWindow {
		GLWindow() { in_use = false; }
		bool in_use;

		DisplayServer::WindowID window_id;
		int width;
		int height;

		id window_view;
		NSOpenGLContext *context;
	};

	LocalVector<GLWindow> _windows;

	NSOpenGLContext *_shared_context = nullptr;
	GLWindow *_current_window;

	Error _create_context(GLWindow &win);
	void _internal_set_current_window(GLWindow *p_win);

	GLWindow &get_window(unsigned int id) { return _windows[id]; }
	const GLWindow &get_window(unsigned int id) const { return _windows[id]; }

	bool use_vsync;
	ContextType context_type;

public:
	Error window_create(DisplayServer::WindowID p_window_id, id p_view, int p_width, int p_height);
	void window_destroy(DisplayServer::WindowID p_window_id);
	void window_resize(DisplayServer::WindowID p_window_id, int p_width, int p_height);

	// get directly from the cached GLWindow
	int window_get_width(DisplayServer::WindowID p_window_id = 0);
	int window_get_height(DisplayServer::WindowID p_window_id = 0);

	void release_current();
	void make_current();
	void swap_buffers();

	void window_make_current(DisplayServer::WindowID p_window_id);

	void window_update(DisplayServer::WindowID p_window_id);

	Error initialize();

	void set_use_vsync(bool p_use);
	bool is_using_vsync() const;

	GLManager_OSX(ContextType p_context_type);
	~GLManager_OSX();
};

#endif // defined(OSX_ENABLED) && defined(GLES3_ENABLED)

#endif // GL_MANAGER_OSX_H