rectangle-light.cpp

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/*
 * Copyright (C) 2023  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#include <engine/scene/rectangle-light.hpp>
#include <engine/math/numbers.hpp>
 
namespace scene {
 
rectangle_light::rectangle_light()
{
    transformed();
}
 
void rectangle_light::set_size(const math::fvec2& size)
{
    set_scale({size.x(), size.y(), 1.0f});
}
 
void rectangle_light::transformed()
{
    const auto& transform = get_transform();
    
    // Update corner positions
    // m_corners[0] = transform * math::fvec3{-0.5f, 0.0f, -0.5f};
    // m_corners[1] = transform * math::fvec3{ 0.5f, 0.0f, -0.5f};
    // m_corners[2] = transform * math::fvec3{ 0.5f, 0.0f,  0.5f};
    // m_corners[3] = transform * math::fvec3{-0.5f, 0.0f,  0.5f};
    m_corners[0] = transform * math::fvec3{-0.5f, -0.5f, 0.0f};
    m_corners[1] = transform * math::fvec3{-0.5f,  0.5f, 0.0f};
    m_corners[2] = transform * math::fvec3{ 0.5f,  0.5f, 0.0f};
    m_corners[3] = transform * math::fvec3{ 0.5f, -0.5f, 0.0f};
    
    // Update area
    m_area = get_scale().x() * get_scale().y();
    area_updated();
}
 
void rectangle_light::color_updated()
{
    m_colored_luminous_flux = get_color() * m_luminous_flux;
    m_colored_luminance = get_color() * m_luminance;
}
 
void rectangle_light::area_updated() noexcept
{
    // Calculate luminance from luminous flux
    m_luminance = m_luminous_flux / (m_area * math::pi<float>);
    m_colored_luminance = get_color() * m_luminance;
}
 
void rectangle_light::luminous_flux_updated() noexcept
{
    m_colored_luminous_flux = get_color() * m_luminous_flux;
    
    // Calculate luminance from luminous flux
    m_luminance = m_luminous_flux / (m_area * math::pi<float>);
    m_colored_luminance = get_color() * m_luminance;
}
 
void rectangle_light::luminance_updated() noexcept
{
    m_colored_luminance = get_color() * m_luminance;
    
    // Calculate luminous flux from luminance
    m_luminous_flux = m_luminance * (m_area * math::pi<float>);
    m_colored_luminous_flux = get_color() * m_luminous_flux;
}
 
} // namespace scene