bloom-pass.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_BLOOM_PASS_HPP
#define ANTKEEPER_RENDER_BLOOM_PASS_HPP
 
#include <engine/render/pass.hpp>
#include <engine/gl/shader-template.hpp>
#include <engine/gl/shader-program.hpp>
#include <engine/gl/shader-variable.hpp>
#include <engine/gl/vertex-buffer.hpp>
#include <engine/gl/vertex-array.hpp>
#include <engine/gl/texture.hpp>
#include <engine/gl/sampler.hpp>
#include <memory>
#include <functional>
 
class resource_manager;
 
namespace render {
 
class bloom_pass: public pass
{
public:
    bloom_pass(gl::pipeline* pipeline, resource_manager* resource_manager);
    
    void render(render::context& ctx) override;
    
    void resize();
    
    void set_source_texture(std::shared_ptr<gl::texture_2d> texture);
    
    void set_mip_chain_length(unsigned int length);
    
    void set_filter_radius(float radius);
    
    [[nodiscard]] inline std::shared_ptr<gl::texture_2d> get_bloom_texture() const
    {
        return m_target_textures.empty() ? nullptr : m_target_textures.front();
    }
 
private:
    void rebuild_mip_chain();
    void correct_filter_radius();
    void rebuild_command_buffer();
    
    std::shared_ptr<gl::texture_2d> m_source_texture;
    std::shared_ptr<gl::image_2d> m_target_image;
    std::vector<std::shared_ptr<gl::texture_2d>> m_target_textures;
    std::vector<std::shared_ptr<gl::framebuffer>> m_target_framebuffers;
    
    std::unique_ptr<gl::shader_program> m_downsample_karis_shader;
    std::unique_ptr<gl::shader_program> m_downsample_shader;
    std::unique_ptr<gl::shader_program> m_upsample_shader;
    
    std::shared_ptr<gl::sampler> m_sampler;
    std::unique_ptr<gl::vertex_array> m_vertex_array;
    unsigned int m_mip_chain_length{0};
    float m_filter_radius{0.005f};
    math::fvec2 m_corrected_filter_radius{0.005f, 0.005f};
    
    std::vector<std::function<void()>> m_command_buffer;
};
 
} // namespace render
 
#endif // ANTKEEPER_RENDER_BLOOM_PASS_HPP