restructure zephr

text.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include "ui.h"
+
+typedef struct Character {
+  Size size;
+  Size bearing;
+  unsigned int advance;
+  Vec2f tex_coords[4]; // the 4 corners of the character quad
+} Character;
+
+typedef struct ZephFont {
+  Character characters[128];
+  unsigned int atlas_texture_id;
+} ZephFont;
+
+typedef struct TextInstance {
+  Vec4f position;
+  int tex_coords_index;
+  Color color;
+  float model[4][4];
+} TextInstance;
+
+typedef struct GlyphInstanceList {
+  TextInstance *data;
+  int size;
+  int capacity;
+} GlyphInstanceList;
+
+int init_fonts(const char *font_path);
+Sizef calculate_text_size(const char *text, int font_size);
+void draw_text(const char* text, int font_size, UIConstraints constraints, const Color *color, Alignment alignment);