material-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_MATERIAL_PASS_HPP
#define ANTKEEPER_RENDER_MATERIAL_PASS_HPP
 
#include <engine/render/pass.hpp>
#include <engine/render/material.hpp>
#include <engine/render/material-blend-mode.hpp>
#include <engine/math/vector.hpp>
#include <engine/gl/shader-program.hpp>
#include <engine/gl/shader-variable.hpp>
#include <engine/gl/texture.hpp>
#include <functional>
#include <unordered_map>
#include <span>
 
class resource_manager;
 
namespace render {
 
class material_pass: public pass
{
public:
    material_pass(gl::pipeline* pipeline, const gl::framebuffer* framebuffer, resource_manager* resource_manager);
    
    void render(render::context& ctx) override;
    
    void set_fallback_material(std::shared_ptr<render::material> fallback);
    
    inline void set_mouse_position(const math::fvec2& position)
    {
        mouse_position = position;
    }
    
private:
    struct shader_cache_entry
    {
        std::unique_ptr<gl::shader_program> shader_program;
        
        std::vector<std::function<void()>> shader_command_buffer;
        
        std::vector<std::function<void()>> geometry_command_buffer;
        
        std::unordered_map<const material*, std::vector<std::function<void()>>> material_command_buffers;
    };
    
    std::unordered_map<std::size_t, shader_cache_entry> shader_cache;
    
    void evaluate_camera(const render::context& ctx);
    
    void evaluate_lighting(const render::context& ctx, std::uint32_t layer_mask);
    
    void evaluate_misc(const render::context& ctx);
    
    [[nodiscard]] std::unique_ptr<gl::shader_program> generate_shader_program(const gl::shader_template& shader_template, material_blend_mode blend_mode) const;
    
    void build_shader_command_buffer(std::vector<std::function<void()>>& command_buffer, const gl::shader_program& shader_program) const;
    void build_geometry_command_buffer(std::vector<std::function<void()>>& command_buffer, const gl::shader_program& shader_program) const;
    void build_material_command_buffer(std::vector<std::function<void()>>& command_buffer, const gl::shader_program& shader_program, const material& material) const;
    
    // Camera
    const math::fmat4* view;
    const math::fmat4* inv_view;
    const math::fmat4* projection;
    const math::fmat4* view_projection;
    math::fvec4 view_translation;
    math::fmat4 view_rotation;
    math::fmat4 model_view;
    const math::fvec3* camera_position;
    float camera_exposure;
    
    // Light probes
    const gl::texture_cube* light_probe_luminance_texture{};
    const gl::texture_1d* light_probe_illuminance_texture{};
    std::size_t light_probe_count;
    
    // Point lights
    std::vector<math::fvec3> point_light_colors;
    std::vector<math::fvec3> point_light_positions;
    std::size_t point_light_count;
    
    // Directional lights
    std::vector<math::fvec3> directional_light_colors;
    std::vector<math::fvec3> directional_light_directions;
    std::size_t directional_light_count;
    
    // Directional shadows
    std::vector<const gl::texture_2d*> directional_shadow_maps;
    std::vector<math::fvec4> directional_shadow_splits;
    std::vector<float> directional_shadow_fade_ranges;
    std::vector<std::span<const math::fmat4>> directional_shadow_matrices;
    std::size_t directional_shadow_count;
    
    // Spot lights
    std::vector<math::fvec3> spot_light_colors;
    std::vector<math::fvec3> spot_light_positions;
    std::vector<math::fvec3> spot_light_directions;
    std::vector<math::fvec2> spot_light_cutoffs;
    std::size_t spot_light_count;
    
    // Rectangle lights
    std::vector<math::fvec3> rectangle_light_colors;
    std::vector<math::fvec3> rectangle_light_corners;
    std::size_t rectangle_light_count;
    
    // LTC
    std::shared_ptr<gl::texture_2d> ltc_lut_1;
    std::shared_ptr<gl::texture_2d> ltc_lut_2;
    
    // IBL
    std::shared_ptr<gl::texture_2d> brdf_lut;
    
    // Misc
    float time;
    float timestep;
    unsigned int frame{0};
    float subframe;
    math::fvec2 resolution;
    math::fvec2 mouse_position;
    
    // Geometry
    const math::fmat4* model;
    std::span<const math::fmat4> matrix_palette;
    
    std::size_t lighting_state_hash;
    
    std::shared_ptr<render::material> fallback_material;
};
 
} // namespace render
 
#endif // ANTKEEPER_RENDER_MATERIAL_PASS_HPP