- /*
- * 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/spot-light.hpp>
- #include <engine/config.hpp>
- #include <engine/math/quaternion.hpp>
- #include <engine/math/interpolation.hpp>
- #include <cmath>
-
- namespace scene {
-
- static float3 interpolate_direction(const float3& x, const float3& y, float a)
- {
- math::quaternion<float> q0 = math::rotation(config::global_forward, x);
- math::quaternion<float> q1 = math::rotation(config::global_forward, y);
- return math::normalize(math::slerp(q0, q1, a) * config::global_forward);
- }
-
- spot_light::spot_light():
- direction(config::global_forward, interpolate_direction),
- attenuation(float3{1, 0, 0}, math::lerp<float3, float>),
- cutoff(float2{math::pi<float>, math::pi<float>}, math::lerp<float2, float>),
- cosine_cutoff(float2{std::cos(math::pi<float>), std::cos(math::pi<float>)}, math::lerp<float2, float>)
- {}
-
- void spot_light::set_attenuation(const float3& attenuation)
- {
- this->attenuation[1] = attenuation;
- }
-
- void spot_light::set_cutoff(const float2& cutoff)
- {
- this->cutoff[1] = cutoff;
- this->cosine_cutoff[1] = {std::cos(cutoff.x()), std::cos(cutoff.y())};
- }
-
- void spot_light::update_tweens()
- {
- light::update_tweens();
- direction.update();
- attenuation.update();
- cutoff.update();
- cosine_cutoff.update();
- }
-
- void spot_light::transformed()
- {
- direction[1] = math::normalize(get_transform().rotation * config::global_forward);
- }
-
- } // namespace scene
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