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

helper.h

@@ -4,5 +4,8 @@ typedef struct {
     float m[4][4];
 } Matrix4x4;
 
+Matrix4x4 identity();
 Matrix4x4 orthographic_projection_2d(float left, float right, float bottom, float top);
 int max(int a, int b);
+float maxf(float a, float b);
+float clampf(float value, float min, float max);