font.hpp

// SPDX-License-Identifier: MIT
// Author:  Giovanni Santini
// Mail:    giovanni.santini@proton.me
// Github:  @San7o
 
#pragma once
 
#include <brenta/renderer/opengl/vao.hpp>
#include <brenta/renderer/opengl/buffer.hpp>
 
#include <glm/vec2.hpp>
 
#include <tenno/memory.hpp>
#include <tenno/vector.hpp>
 
#include <filesystem>
#include <map>
 
namespace brenta
{
 
class Shader;
  
class Font
{
public:
 
  class Character
  {
  public:
    unsigned int texture_id; // ID handle of the glyph texture
    glm::ivec2   size;       // Size of glyph
    glm::ivec2   bearing;    // Offset from baseline to left/top of glyph
    unsigned int advance;    // Offset to advance to next glyph
  };
 
  class Builder;
  
  tenno::shared_ptr<Shader>   shader;
  Vao                         vao;
  Buffer                      vbo;
  std::map<char, Character>   characters;
  
  Font() = default;
  Font(const std::filesystem::path &path, int size);
  Font(Font&&) = default;
  ~Font();
 
};
 
class Font::Builder
{
public:
 
  Builder& path(const std::filesystem::path& path);
  Builder& size(int size);
 
  // Add path to be watched for hot-reloading
  Builder &watch(const std::filesystem::path &path);
  
  Font build();
  tenno::vector<std::filesystem::path> get_watch_paths() const;
  
private:
 
  std::filesystem::path _path;
  int                   _size;
  
  tenno::vector<std::filesystem::path> watch_paths = {};
  
};  
 
} // namespave brenta