calculate help overlay width from text instead of hardcoding it

helper.c

@@ -1,14 +1,18 @@
 #include "helper.h"
 
-Matrix4x4 orthographic_projection_2d(float left, float right, float bottom, float top) {
-    Matrix4x4 result;
+Matrix4x4 identity() {
+    Matrix4x4 result = {0};
 
-    // Identity matrix
-    for (int i = 0; i < 4; i++) {
-        for (int j = 0; j < 4; j++) {
-            result.m[i][j] = 0.0f;
-        }
-    }
+    result.m[0][0] = 1.0f;
+    result.m[1][1] = 1.0f;
+    result.m[2][2] = 1.0f;
+    result.m[3][3] = 1.0f;
+
+    return result;
+}
+
+Matrix4x4 orthographic_projection_2d(float left, float right, float bottom, float top) {
+    Matrix4x4 result = identity();
 
     result.m[0][0] = 2.0f / (right - left);
     result.m[3][0] = -(right + left) / (right - left);
@@ -19,3 +23,7 @@ Matrix4x4 orthographic_projection_2d(float left, float right, float bottom, floa
 
     return result;
 }
+
+int max(int a, int b) {
+    return a > b ? a : b;
+}