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framework/geometry/frustum.cpp

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+/* Copyright (c) 2019, Sascha Willems
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 the "License";
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "frustum.h"
+
+namespace vkb
+{
+void Frustum::update(const 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 (size_t i = 0; i < planes.size(); i++)
+	{
+		float length = sqrtf(planes[i].x * planes[i].x + planes[i].y * planes[i].y + planes[i].z * planes[i].z);
+		planes[i] /= length;
+	}
+}
+
+bool Frustum::check_sphere(glm::vec3 pos, float radius)
+{
+	for (size_t 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;
+}
+const std::array<glm::vec4, 6> &Frustum::get_planes() const
+{
+	return planes;
+}
+}        // namespace vkb