material_instance.hpp

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#pragma once
#include "material.hpp"
 
#include <string>
#include <unordered_map>
 
namespace assets {

class TOAST_API MaterialInstance : public Material {
public:
  explicit MaterialInstance(const toml::table& table, Handle<Schema> schema = {});
  ~MaterialInstance() override;
 
  [[nodiscard]]
  auto type() const -> std::string_view override {
    return "material_instance";
  }
 
  [[nodiscard]]
  auto serialize(SaveMode mode) const -> std::vector<uint8_t> override;
 
  void reload(const toml::table& table) override;
 
  [[nodiscard]]
  auto parent() const -> const Handle<Material>&;    
 
  [[nodiscard]]
  auto shaders() const -> const std::vector<Handle<Shader>>& override;
 
  [[nodiscard]]
  auto settings() const -> MaterialSettings override;
 
  [[nodiscard]]
  auto value(std::string_view key) const -> const DataValue* override;
 
  [[nodiscard]]
  auto rootMaterial() -> Material* override;
 
private:
  auto parentMaterial() const -> Material*;
 
  [[nodiscard]]
  auto deltaRoot() const -> DataValue;
 
  mutable Handle<Material> m_parent;
  mutable bool m_parent_dirty = true;
  mutable std::unordered_map<std::string, DataValue> m_merged_objects;
};
 
}