cascaded-shadow-map-stage.hpp

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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/>.
 */
 
#ifndef ANTKEEPER_RENDER_CASCADED_SHADOW_MAP_STAGE_HPP
#define ANTKEEPER_RENDER_CASCADED_SHADOW_MAP_STAGE_HPP
 
#include <engine/render/stage.hpp>
#include <engine/gl/shader-template.hpp>
#include <engine/gl/shader-program.hpp>
#include <engine/gl/shader-variable.hpp>
#include <engine/gl/pipeline.hpp>
#include <engine/scene/directional-light.hpp>
#include <engine/resources/resource-manager.hpp>
#include <memory>
#include <string>
#include <unordered_map>
 
namespace render {
 
class cascaded_shadow_map_stage: public stage
{
public:
    cascaded_shadow_map_stage(gl::pipeline& pipeline, ::resource_manager& resource_manager);
    
    void execute(render::context& ctx) override;
    
    void set_max_bone_count(std::size_t bone_count);
    
    [[nodiscard]] inline constexpr std::size_t get_max_bone_count() const noexcept
    {
        return m_max_bone_count;
    }
 
private:
    void queue(render::context& ctx, scene::directional_light& light, const math::fmat4& light_view_projection);
    
    void render_shadow_atlas(render::context& ctx, scene::directional_light& light);
    
    void rebuild_static_mesh_shader_program();
    
    void rebuild_skeletal_mesh_shader_program();
    
    gl::pipeline* m_pipeline;
    
    std::size_t m_max_bone_count{64};
    
    std::unordered_map<std::string, std::string> m_shader_template_definitions;
    
    std::shared_ptr<gl::shader_template> m_static_mesh_shader_template;
    std::unique_ptr<gl::shader_program> m_static_mesh_shader_program;
    const gl::shader_variable* m_static_mesh_model_view_projection_var;
    
    std::shared_ptr<gl::shader_template> m_skeletal_mesh_shader_template;
    std::unique_ptr<gl::shader_program> m_skeletal_mesh_shader_program;
    const gl::shader_variable* m_skeletal_mesh_model_view_projection_var;
    const gl::shader_variable* m_skeletal_mesh_matrix_palette_var;
};
 
} // namespace render
 
#endif // ANTKEEPER_RENDER_CASCADED_SHADOW_MAP_STAGE_HPP