clientdynamicinfo.h

/*
Minetest
Copyright (C) 2022-3 rubenwardy <rw@rubenwardy.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#pragma once

#include "irrlichttypes_bloated.h"
#ifndef SERVER
#include "settings.h"
#include "client/renderingengine.h"
#endif


struct ClientDynamicInfo
{
public:
	v2u32 render_target_size;
	f32 real_gui_scaling;
	f32 real_hud_scaling;
	v2f32 max_fs_size;

	bool equal(const ClientDynamicInfo &other) const {
		return render_target_size == other.render_target_size &&
				abs(real_gui_scaling - other.real_gui_scaling) < 0.001f &&
				abs(real_hud_scaling - other.real_hud_scaling) < 0.001f;
	}

#ifndef SERVER
	static ClientDynamicInfo getCurrent() {
		v2u32 screen_size = RenderingEngine::getWindowSize();
		f32 density = RenderingEngine::getDisplayDensity();
		f32 gui_scaling = g_settings->getFloat("gui_scaling", 0.5f, 20.0f);
		f32 hud_scaling = g_settings->getFloat("hud_scaling", 0.5f, 20.0f);
		f32 real_gui_scaling = gui_scaling * density;
		f32 real_hud_scaling = hud_scaling * density;

		return {
			screen_size, real_gui_scaling, real_hud_scaling,
			ClientDynamicInfo::calculateMaxFSSize(screen_size, gui_scaling)
		};
	}
#endif

private:
#ifndef SERVER
	static v2f32 calculateMaxFSSize(v2u32 render_target_size, f32 gui_scaling) {
		f32 factor =
#ifdef HAVE_TOUCHSCREENGUI
				10 / gui_scaling;
#else
				15 / gui_scaling;
#endif
		f32 ratio = (f32)render_target_size.X / (f32)render_target_size.Y;
		if (ratio < 1)
			return { factor, factor / ratio };
		else
			return { factor * ratio, factor };
	}
#endif
};