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/*
Minetest
Copyright (C) 2021 x2048, Dmitry Kostenko <codeforsmile@gmail.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
/**
* Parameters for automatic exposure compensation
*
* Automatic exposure compensation uses the following equation:
*
* wanted_exposure = 2^exposure_correction / clamp(observed_luminance, 2^luminance_min, 2^luminance_max)
*
*/
struct AutoExposure
{
/// @brief Minimum boundary for computed luminance
float luminance_min;
/// @brief Maximum boundary for computed luminance
float luminance_max;
/// @brief Luminance bias. Higher values make the scene darker, can be negative.
float exposure_correction;
/// @brief Speed of transition from dark to bright scenes
float speed_dark_bright;
/// @brief Speed of transition from bright to dark scenes
float speed_bright_dark;
/// @brief Power value for center-weighted metering. Value of 1.0 measures entire screen uniformly
float center_weight_power;
AutoExposure();
};
/** Describes ambient light settings for a player
*/
struct Lighting
{
AutoExposure exposure;
float shadow_intensity {0.0f};
float saturation {1.0f};
};
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