💿🐜 Antkeeper source code
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183 lines
5.2 KiB
183 lines
5.2 KiB
/*
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* Copyright (C) 2023 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ANTKEEPER_SCENE_DIRECTIONAL_LIGHT_HPP
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#define ANTKEEPER_SCENE_DIRECTIONAL_LIGHT_HPP
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#include <engine/scene/light.hpp>
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#include <engine/gl/texture-2d.hpp>
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#include <engine/utility/fundamental-types.hpp>
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#include <vector>
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namespace scene {
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/**
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* Light source with parallel rays and constant intensity.
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*/
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class directional_light: public light
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{
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public:
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/// Creates a directional light.
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directional_light();
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/// Returns light_type::directional.
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[[nodiscard]] inline light_type get_light_type() const noexcept override
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{
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return light_type::directional;
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}
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/// Returns the normalized direction vector of the light.
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[[nodiscard]] inline const float3& get_direction() const noexcept
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{
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return direction[1];
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}
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inline const tween<float3>& get_direction_tween() const noexcept
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{
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return direction;
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}
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/// @copydoc object_base::update_tweens();
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void update_tweens() override;
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/// @name Shadow
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/// @{
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/**
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* Enables or disables shadow casting.
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*
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* @param caster `true` if the light should cast shadows, `false` otherwise.
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*/
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void set_shadow_caster(bool caster) noexcept;
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/**
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* Sets the shadow map framebuffer.
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*
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* @param framebuffer Pointer to a shadow map framebuffer.
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*/
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void set_shadow_framebuffer(const gl::framebuffer* framebuffer) noexcept;
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/**
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* Sets the shadow bias factor for reducing self-shadowing.
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*
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* @param bias Shadow bias factor.
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*/
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void set_shadow_bias(float bias) noexcept;
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/**
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* Sets the number of shadow cascades.
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*
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* @param count Number of shadow cascades.
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*/
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void set_shadow_cascade_count(unsigned int count) noexcept;
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/**
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* Sets the shadow cascade coverage factor.
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*
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* @param factor Percentage of the view frustum clipping range covered by shadow cascades. A value of `1.0` results in full coverage of the view frustum clipping range, `0.5` results in coverage of half of the clipping range, etc.
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*/
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void set_shadow_cascade_coverage(float factor) noexcept;
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/**
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* Sets the shadow cascade distribution.
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*
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* @param weight Linear interpolation weight between uniform and logarithmic cascade distributions. A weight of `0.0` results in a uniform cascade distribution, while `1.0` results in a logarithmic distribution.
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*/
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void set_shadow_cascade_distribution(float weight) noexcept;
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/// Returns `true` if the light casts shadows, `false` otherwise.
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[[nodiscard]] inline bool is_shadow_caster() const noexcept
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{
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return shadow_caster;
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}
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/// Returns the shadow map framebuffer, of `nullptr` if no shadow map framebuffer is set.
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[[nodiscard]] inline const gl::framebuffer* get_shadow_framebuffer() const noexcept
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{
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return shadow_framebuffer;
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}
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/// Returns the shadow bias factor.
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[[nodiscard]] inline float get_shadow_bias() const noexcept
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{
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return shadow_bias;
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}
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/// Returns the number of shadow cascades.
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[[nodiscard]] inline unsigned int get_shadow_cascade_count() const noexcept
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{
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return shadow_cascade_count;
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}
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/// Returns the shadow cascade coverage factor.
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[[nodiscard]] inline float get_shadow_cascade_coverage() const noexcept
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{
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return shadow_cascade_coverage;
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}
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/// Returns the shadow cascade distribution weight.
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[[nodiscard]] inline float get_shadow_cascade_distribution() const noexcept
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{
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return shadow_cascade_distribution;
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}
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/// Returns the array of shadow cascade far clipping plane distances.
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/// @{
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[[nodiscard]] inline const std::vector<float>& get_shadow_cascade_distances() const noexcept
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{
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return shadow_cascade_distances;
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}
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[[nodiscard]] inline std::vector<float>& get_shadow_cascade_distances() noexcept
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{
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return shadow_cascade_distances;
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}
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/// @}
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/// Returns the array of world-space to cascade texture-space transformation matrices.
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/// @{
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[[nodiscard]] inline const std::vector<float4x4>& get_shadow_cascade_matrices() const noexcept
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{
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return shadow_cascade_matrices;
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}
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[[nodiscard]] inline std::vector<float4x4>& get_shadow_cascade_matrices() noexcept
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{
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return shadow_cascade_matrices;
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}
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/// @}
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/// @}
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private:
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void transformed() override;
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tween<float3> direction;
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bool shadow_caster{false};
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const gl::framebuffer* shadow_framebuffer{nullptr};
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float shadow_bias{0.005f};
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unsigned int shadow_cascade_count{4};
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float shadow_cascade_coverage{1.0f};
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float shadow_cascade_distribution{0.8f};
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mutable std::vector<float> shadow_cascade_distances;
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mutable std::vector<float4x4> shadow_cascade_matrices;
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};
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} // namespace scene
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#endif // ANTKEEPER_SCENE_DIRECTIONAL_LIGHT_HPP
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