refactor font code into classes

engine/font.h

@@ -1,4 +1,40 @@
 #pragma once
+#include "texture.h"
+#include "util.h"
 
+enum class kFont : uint16_t
+{
+    Arial_11 = const_hash("arial-16"),
+};
 
+class Font
+{
+public:
+    const int w = 512;
+    const int h = 512;
+    const int num_chars = 96;
+    const int start_char = 32;
+    stbtt_fontinfo font;
+    Texture2D font_tex;
+    std::vector<stbtt_bakedchar> chars;
+    
+    bool load(const char* ttf);
+};
 
+class FontManager
+{
+    static std::map<kFont, Font> m_fonts;
+public:
+    static bool load(kFont id, const char* ttf);
+    static const Font& get(kFont id);
+};
+
+class TextMesh
+{
+public:
+    GLuint font_array = 0;
+    int font_array_count = 0;
+    GLuint font_buffers[2] = {0, 0};
+    bool create();
+    void update(kFont id, const char* text);
+};