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