super basic UI constraint and alignment system with a super basic "game framework"

ui.h

@@ -0,0 +1,86 @@
+#pragma once
+
+#include <stdbool.h>
+
+#include "helper.h"
+
+typedef struct Size {
+  int width;
+  int height;
+} Size;
+
+typedef struct Sizef {
+  float width;
+  float height;
+} Sizef;
+
+typedef struct Vec2 {
+  int x;
+  int y;
+} Vec2;
+
+typedef struct Vec2f {
+  float x;
+  float y;
+} Vec2f;
+
+typedef struct Color {
+  float r;
+  float g;
+  float b;
+  float a;
+} Color;
+
+typedef struct Character {
+  unsigned int texture_id;
+  Size size;
+  Size bearing;
+  unsigned int advance;
+} Character;
+
+typedef struct {
+  bool should_quit;
+  Color clear_color;
+  Size window_size;
+
+  Matrix4x4 projection;
+} Context;
+
+typedef enum Alignment {
+  ALIGN_TOP_LEFT,
+  ALIGN_TOP_CENTER,
+  ALIGN_TOP_RIGHT,
+  ALIGN_LEFT_CENTER,
+  ALIGN_CENTER,
+  ALIGN_RIGHT_CENTER,
+  ALIGN_BOTTOM_LEFT,
+  ALIGN_BOTTOM_CENTER,
+  ALIGN_BOTTOM_RIGHT,
+} Alignment;
+
+typedef enum UIConstraint {
+  UI_CONSTRAINT_FIXED,
+  UI_CONSTRAINT_RELATIVE,
+  UI_CONSTRAINT_RELATIVE_PIXELS,
+  UI_CONSTRAINT_ASPECT_RATIO,
+} UIConstraint;
+
+typedef struct UIConstraints {
+  float x;
+  float y;
+  float width;
+  float height;
+} UIConstraints;
+
+int init_zephr(const char* font_path, const char* window_title, Size window_size, Color *clear_color);
+void deinit_zephr();
+bool zephr_should_quit();
+void zephr_swap_buffers();
+Size zephr_get_window_size();
+void set_x_constraint(UIConstraints *constraints, float value, UIConstraint type);
+void set_y_constraint(UIConstraints *constraints, float value, UIConstraint type);
+void set_width_constraint(UIConstraints *constraints, float value, UIConstraint type);
+void set_height_constraint(UIConstraints *constraints, float value, UIConstraint type);
+void draw_quad(UIConstraints constraints, Color *color, Alignment align);
+void draw_text(const char* text, float scale, Vec2f pos, Color *color, Alignment align);
+Sizef calculate_text_size(const char *text, float scale);