AABB block hitboxes

src/maths/aabb.h

@@ -5,13 +5,20 @@
 
 // Axis Aligned Bounding Box
 struct AABB {
-	glm::vec3 a;
-    glm::vec3 b;
+	glm::vec3 a {0.0f};
+    glm::vec3 b {1.0f};
 
+    /* Get AABB point with minimal x,y,z */
     inline glm::vec3 min() const {
         return glm::min(a, b);
     }
 
+    /* Get AABB point with minimal x,y,z */
+    inline glm::vec3 max() const {
+        return glm::max(a, b);
+    }
+
+    /* Get AABB dimensions: width, height, depth */
     inline glm::vec3 size() const {
         return glm::vec3(
             fabs(b.x - a.x),
@@ -20,6 +27,27 @@ struct AABB {
         );
     }
 
+    inline glm::vec3 center() const {
+        return (a + b) * 0.5f;
+    }
+
+    /* Multiply AABB size from center */
+    inline void scale(const glm::vec3 mul) {
+        glm::vec3 center = (a + b) * 0.5f;
+        a = (a - center) * mul + center;
+        b = (b - center) * mul + center;
+    }
+
+    /* Multiply AABB size from given origin */
+    inline void scale(const glm::vec3 mul, const glm::vec3 orig) {
+        glm::vec3 beg = min();
+        glm::vec3 end = max();
+        glm::vec3 center = glm::mix(beg, end, orig);
+        a = (a - center) * mul + center;
+        b = (b - center) * mul + center;
+    }
+
+    /* Check if given point is inside */
     inline bool inside(const glm::vec3 pos) const {
         const glm::vec3 p = min();
         const glm::vec3 s = size();