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129 lines
4.3 KiB
129 lines
4.3 KiB
/****************************************************************************
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Copyright (c) 2021-2023 Xiamen Yaji Software Co., Ltd.
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http://www.cocos.com
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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 to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do so,
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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 "scene/LODGroup.h"
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#include <cmath>
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#include "core/scene-graph/Node.h"
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#include "scene/Camera.h"
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namespace cc {
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namespace scene {
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void LODData::eraseModel(Model *model) {
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auto iter = std::find(_vecModels.begin(), _vecModels.end(), model);
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if (iter != _vecModels.end()) {
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_vecModels.erase(iter);
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}
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}
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LODGroup::LODGroup() = default;
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LODGroup::~LODGroup() = default;
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int8_t LODGroup::getVisibleLODLevel(const Camera *camera) const {
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float screenUsagePercentage = getScreenUsagePercentage(camera);
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int8_t lodIndex = -1;
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for (auto i = 0; i < _vecLODData.size(); ++i) {
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const auto &lod = _vecLODData[i];
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if (screenUsagePercentage >= lod->getScreenUsagePercentage()) {
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lodIndex = i;
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break;
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}
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}
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return lodIndex;
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}
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float LODGroup::getScreenUsagePercentage(const Camera *camera) const {
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if (!_node.get()) {
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return 0;
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}
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auto distance = 0;
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if (camera->getProjectionType() == CameraProjection::PERSPECTIVE) {
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Vec3 tmp{_localBoundaryCenter};
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tmp.transformMat4(_node->getWorldMatrix());
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tmp.subtract(camera->getNode()->getWorldPosition());
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distance = tmp.length();
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}
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return distanceToScreenUsagePercentage(camera, distance, getWorldSpaceSize());
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}
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float LODGroup::distanceToScreenUsagePercentage(const Camera *camera, float distance, float size) {
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if (camera->getProjectionType() == CameraProjection::PERSPECTIVE) {
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return static_cast<float>((size * fabs(camera->getMatProj().m[5])) / (distance * 2.0)); // note: matProj.m11 is 1 / tan(fov / 2.0)
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}
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return static_cast<float>(size * fabs(camera->getMatProj().m[5]) * 0.5);
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}
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float LODGroup::getWorldSpaceSize() const {
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auto scale = _node->getScale();
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auto maxScale = fmaxf(fabs(scale.x), fabs(scale.y));
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maxScale = fmaxf(maxScale, fabs(scale.z));
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return maxScale * _objectSize;
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}
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void LODGroup::lockLODLevels(ccstd::vector<int> &levels) {
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if (levels.size() != _vecLockedLevels.size()) {
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_isLockLevelChanged = true;
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} else {
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auto size = levels.size();
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for (int index = 0; index < size; index++) {
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if (levels[index] != _vecLockedLevels[index]) {
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_isLockLevelChanged = true;
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break;
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}
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}
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}
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_vecLockedLevels.clear();
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_vecLockedLevels.insert(_vecLockedLevels.begin(), levels.begin(), levels.end());
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}
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void LODGroup::insertLOD(uint8_t index, LODData *data) {
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if (index >= _vecLODData.size()) {
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_vecLODData.emplace_back(data);
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} else {
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_vecLODData.insert(_vecLODData.begin() + index, data);
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}
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}
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void LODGroup::updateLOD(uint8_t index, LODData *data) {
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if (index >= _vecLODData.size()) {
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CC_LOG_WARNING("LODGroup updateLOD error, index out of range.");
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return;
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}
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_vecLODData[index] = data;
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}
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void LODGroup::eraseLOD(uint8_t index) {
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if (index >= _vecLODData.size()) {
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CC_LOG_WARNING("LODGroup eraseLOD error, index out of range.");
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return;
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}
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_vecLODData.erase(_vecLODData.begin() + index);
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}
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} // namespace scene
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} // namespace cc
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