refactor font loading

src/node_text.h

@@ -13,10 +13,11 @@ public:
     };
     TextMesh m_text_mesh;
     std::string m_text;
-    std::string m_font = "arial";
+    std::string m_font_name = "roboto";
     glm::vec4 m_color{ 1, 1, 1, 1 };
+    std::string m_font_weight = "regular";
     int m_font_size = 17;
-    std::string font_id;
+    bool m_font_italic = false;
 
     bool m_multiline = false;
     glm::vec2 m_off = { 0, 0 };
@@ -32,6 +33,7 @@ public:
 
     void set_text(const std::string& s);
     void set_text_format(const char* fmt, ...);
-    void set_font(const std::string& fontID);
+    void set_font(const std::string& name, int size, const std::string& weight, bool italic);
+    void set_font_size(int size);
     void update_layout();
 };