[cube] Store center of the cube instead of recalculating it every time

Author: IAmNotHanni

include/inexor/vulkan-renderer/world/cube.hpp

@@ -67,6 +67,7 @@ class Cube : public std::enable_shared_from_this<Cube> {
     Type m_type{Type::EMPTY};
     float m_size{32};
     glm::vec3 m_position{0.0f, 0.0f, 0.0f};
+    glm::vec3 m_center{0.0f, 0.0f, 0.0f};
 
     /// Root cube is empty.
     std::weak_ptr<Cube> m_parent{};
@@ -126,7 +127,7 @@ class Cube : public std::enable_shared_from_this<Cube> {
     [[nodiscard]] std::size_t count_geometry_cubes() const noexcept;
 
     [[nodiscard]] glm::vec3 center() const noexcept {
-        return m_position + 0.5f * m_size;
+        return m_center;
     }
 
     [[nodiscard]] glm::vec3 position() const noexcept {

src/vulkan-renderer/world/cube.cpp

@@ -171,7 +171,8 @@ void Cube::rotate<3>(const RotationAxis::Type &axis) {
     }
 }
 
-Cube::Cube(const float size, const glm::vec3 &position) : m_size(size), m_position(position) {}
+Cube::Cube(const float size, const glm::vec3 &position)
+    : m_size(size), m_position(position), m_center(position + 0.5f * size) {}
 
 Cube::Cube(std::weak_ptr<Cube> parent, const std::uint8_t index, const float size, const glm::vec3 &position)
     : Cube(size, position) {