Added frustum culling class

base/frustum.hpp

@@ -0,0 +1,71 @@
+/*
+* View frustum culling class
+*
+* Copyright (C) 2016 by Sascha Willems - www.saschawillems.de
+*
+* This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
+*/
+
+#include <array>
+#include "glm\glm.hpp"
+
+namespace vkTools
+{
+	class Frustum
+	{
+	private:
+		enum side { LEFT = 0, RIGHT = 1, TOP = 2, BOTTOM = 3, BACK = 4, FRONT = 5 };
+		std::array<glm::vec4, 6> planes;
+	public:
+		void update(glm::mat4 matrix)
+		{
+			planes[LEFT].x = matrix[0].w + matrix[0].x;
+			planes[LEFT].y = matrix[1].w + matrix[1].x;
+			planes[LEFT].z = matrix[2].w + matrix[2].x;
+			planes[LEFT].w = matrix[3].w + matrix[3].x;
+
+			planes[RIGHT].x = matrix[0].w - matrix[0].x;
+			planes[RIGHT].y = matrix[1].w - matrix[1].x;
+			planes[RIGHT].z = matrix[2].w - matrix[2].x;
+			planes[RIGHT].w = matrix[3].w - matrix[3].x;
+
+			planes[TOP].x = matrix[0].w - matrix[0].y;
+			planes[TOP].y = matrix[1].w - matrix[1].y;
+			planes[TOP].z = matrix[2].w - matrix[2].y;
+			planes[TOP].w = matrix[3].w - matrix[3].y;
+
+			planes[BOTTOM].x = matrix[0].w + matrix[0].y;
+			planes[BOTTOM].y = matrix[1].w + matrix[1].y;
+			planes[BOTTOM].z = matrix[2].w + matrix[2].y;
+			planes[BOTTOM].w = matrix[3].w + matrix[3].y;
+
+			planes[BACK].x = matrix[0].w + matrix[0].z;
+			planes[BACK].y = matrix[1].w + matrix[1].z;
+			planes[BACK].z = matrix[2].w + matrix[2].z;
+			planes[BACK].w = matrix[3].w + matrix[3].z;
+
+			planes[FRONT].x = matrix[0].w - matrix[0].z;
+			planes[FRONT].y = matrix[1].w - matrix[1].z;
+			planes[FRONT].z = matrix[2].w - matrix[2].z;
+			planes[FRONT].w = matrix[3].w - matrix[3].z;
+
+			for (auto i = 0; i < planes.size(); i++)
+			{
+				float length = std::sqrtf(planes[i].x * planes[i].x + planes[i].y * planes[i].y + planes[i].z * planes[i].z);
+				planes[i] /= length;
+			}
+		}
+		
+		bool checkSphere(glm::vec3 pos, float radius)
+		{
+			for (auto i = 0; i < planes.size(); i++)
+			{
+				if ((planes[i].x * pos.x) + (planes[i].y * pos.y) + (planes[i].z * pos.z) + planes[i].w <= -radius)
+				{
+					return false;
+				}
+			}
+			return true;
+		}
+	};
+}