77 lines
2.3 KiB
C++
77 lines
2.3 KiB
C++
/* Copyright (c) 2019, Sascha Willems
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 the "License";
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "frustum.h"
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namespace vkb
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{
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void Frustum::update(const 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 (size_t 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 Frustum::check_sphere(glm::vec3 pos, float radius)
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{
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for (size_t 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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const std::array<glm::vec4, 6> &Frustum::get_planes() const
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{
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return planes;
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}
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} // namespace vkb
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