/*************************************************************************/
/*  gl_manager_windows.h                                                 */
/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
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/*************************************************************************/

#ifndef GL_MANAGER_WINDOWS_H
#define GL_MANAGER_WINDOWS_H

#if defined(WINDOWS_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 <windows.h>

typedef bool(APIENTRY *PFNWGLSWAPINTERVALEXTPROC)(int interval);
typedef int(APIENTRY *PFNWGLGETSWAPINTERVALEXTPROC)(void);

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

private:
	// any data specific to the window
	struct GLWindow {
		bool in_use = false;

		// the external ID .. should match the GL window number .. unused I think
		DisplayServer::WindowID window_id = DisplayServer::INVALID_WINDOW_ID;
		int width = 0;
		int height = 0;

		// windows specific
		HDC hDC;
		HWND hwnd;

		int gldisplay_id = 0;
	};

	struct GLDisplay {
		// windows specific
		HGLRC hRC;
	};

	LocalVector<GLWindow> _windows;
	LocalVector<GLDisplay> _displays;

	GLWindow *_current_window = nullptr;

	PFNWGLSWAPINTERVALEXTPROC wglSwapIntervalEXT;
	PFNWGLGETSWAPINTERVALEXTPROC wglGetSwapIntervalEXT;

	// funcs
	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]; }

	const GLDisplay &get_current_display() const { return _displays[_current_window->gldisplay_id]; }
	const GLDisplay &get_display(unsigned int id) { return _displays[id]; }

	bool direct_render;
	int glx_minor, glx_major;
	bool use_vsync;
	ContextType context_type;

private:
	int _find_or_create_display(GLWindow &win);
	Error _create_context(GLWindow &win, GLDisplay &gl_display);

public:
	Error window_create(DisplayServer::WindowID p_window_id, HWND p_hwnd, HINSTANCE p_hinstance, 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);

	Error initialize();

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

	GLManager_Windows(ContextType p_context_type);
	~GLManager_Windows();
};

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

#endif // GL_MANAGER_WINDOWS_H