mirror of https://github.com/axmolengine/axmol.git
104 lines
4.1 KiB
C++
104 lines
4.1 KiB
C++
/****************************************************************************
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Copyright (c) 2014-2016 Chukong Technologies Inc.
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Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
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https://axmol.dev/
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#include "3d/Frustum.h"
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#include "2d/Camera.h"
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namespace ax
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{
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bool Frustum::initFrustum(const Camera* camera)
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{
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_initialized = true;
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createPlane(camera);
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return true;
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}
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bool Frustum::isOutOfFrustum(const AABB& aabb) const
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{
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if (_initialized)
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{
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Vec3 point;
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int plane = _clipZ ? 6 : 4;
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for (int i = 0; i < plane; i++)
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{
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const Vec3& normal = _plane[i].getNormal();
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point.x = normal.x < 0 ? aabb._max.x : aabb._min.x;
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point.y = normal.y < 0 ? aabb._max.y : aabb._min.y;
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point.z = normal.z < 0 ? aabb._max.z : aabb._min.z;
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if (_plane[i].getSide(point) == PointSide::FRONT_PLANE)
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return true;
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}
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}
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return false;
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}
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bool Frustum::isOutOfFrustum(const OBB& obb) const
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{
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if (_initialized)
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{
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Vec3 point;
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int plane = _clipZ ? 6 : 4;
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Vec3 obbExtentX = obb._xAxis * obb._extents.x;
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Vec3 obbExtentY = obb._yAxis * obb._extents.y;
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Vec3 obbExtentZ = obb._zAxis * obb._extents.z;
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for (int i = 0; i < plane; i++)
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{
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const Vec3& normal = _plane[i].getNormal();
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point = obb._center;
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point = normal.dot(obb._xAxis) > 0 ? point - obbExtentX : point + obbExtentX;
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point = normal.dot(obb._yAxis) > 0 ? point - obbExtentY : point + obbExtentY;
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point = normal.dot(obb._zAxis) > 0 ? point - obbExtentZ : point + obbExtentZ;
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if (_plane[i].getSide(point) == PointSide::FRONT_PLANE)
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return true;
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}
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}
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return false;
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}
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void Frustum::createPlane(const Camera* camera)
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{
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const Mat4& mat = camera->getViewProjectionMatrix();
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// ref http://www.lighthouse3d.com/tutorials/view-frustum-culling/clip-space-approach-extracting-the-planes/
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// extract frustum plane
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_plane[0].initPlane(-Vec3(mat.m[3] + mat.m[0], mat.m[7] + mat.m[4], mat.m[11] + mat.m[8]),
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(mat.m[15] + mat.m[12])); // left
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_plane[1].initPlane(-Vec3(mat.m[3] - mat.m[0], mat.m[7] - mat.m[4], mat.m[11] - mat.m[8]),
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(mat.m[15] - mat.m[12])); // right
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_plane[2].initPlane(-Vec3(mat.m[3] + mat.m[1], mat.m[7] + mat.m[5], mat.m[11] + mat.m[9]),
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(mat.m[15] + mat.m[13])); // bottom
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_plane[3].initPlane(-Vec3(mat.m[3] - mat.m[1], mat.m[7] - mat.m[5], mat.m[11] - mat.m[9]),
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(mat.m[15] - mat.m[13])); // top
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_plane[4].initPlane(-Vec3(mat.m[3] + mat.m[2], mat.m[7] + mat.m[6], mat.m[11] + mat.m[10]),
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(mat.m[15] + mat.m[14])); // near
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_plane[5].initPlane(-Vec3(mat.m[3] - mat.m[2], mat.m[7] - mat.m[6], mat.m[11] - mat.m[10]),
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(mat.m[15] - mat.m[14])); // far
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}
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}
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