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bb3db7ada7
* Cleanup * CMake cleanups * Update current year * Update copyright header * Use script to return list of all modules * Update credits, license and ghoul
91 lines
4.5 KiB
C++
91 lines
4.5 KiB
C++
/*****************************************************************************************
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* *
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* OpenSpace *
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* *
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* Copyright (c) 2014-2019 *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this *
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* software and associated documentation files (the "Software"), to deal in the Software *
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* without restriction, including without limitation the rights to use, copy, modify, *
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* merge, publish, distribute, sublicense, and/or sell copies of the Software, and to *
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* permit persons to whom the Software is furnished to do so, subject to the following *
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* conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in all copies *
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* or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, *
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A *
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* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT *
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF *
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE *
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* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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****************************************************************************************/
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namespace openspace::volume {
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template <typename VolumeType>
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VolumeSampler<VolumeType>::VolumeSampler(const VolumeType* volume,
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const glm::vec3& filterSize)
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{
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// Only accept filter sizes of size 1, 3, 5, 7...
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// Round down to closest odd number.
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_filterSize = static_cast<glm::ivec3>(
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(filterSize - glm::vec3(1.f)) * glm::vec3(0.5f)
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) * glm::ivec3(2) + glm::ivec3(1);
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_volume = volume;
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}
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template <typename VolumeType>
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typename VolumeType::VoxelType VolumeSampler<VolumeType>::sample(
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const glm::vec3& position) const
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{
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const glm::ivec3 flooredPos = static_cast<glm::ivec3>(glm::floor(position));
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const glm::vec3 t = glm::fract(position);
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// t is now in interval [0, 1[ (never 1)
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const glm::ivec3 minCoords = flooredPos - _filterSize / 2; // min coord to sample from
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// max coords to sample from, including interpolation.
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const glm::ivec3 maxCoords = minCoords + _filterSize;
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const glm::ivec3 clampCeiling = _volume->dimensions() - glm::ivec3(1);
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typename VolumeType::VoxelType value;
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for (int z = minCoords.z; z <= maxCoords.z; z++) {
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for (int y = minCoords.y; y <= maxCoords.y; y++) {
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for (int x = minCoords.x; x <= maxCoords.x; x++) {
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const glm::ivec3 sampleCoords = glm::ivec3(x, y, z);
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float filterCoefficient = 1.f;
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if (x == minCoords.x) {
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filterCoefficient *= (1.f - t.x);
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} else if (x == maxCoords.x) {
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filterCoefficient *= t.x;
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}
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if (y == minCoords.y) {
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filterCoefficient *= (1.f - t.y);
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} else if (y == maxCoords.y) {
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filterCoefficient *= t.y;
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}
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if (z == minCoords.z) {
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filterCoefficient *= (1.f - t.z);
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} else if (z == maxCoords.z) {
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filterCoefficient *= t.z;
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}
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glm::ivec3 clampedCoords = glm::clamp(
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sampleCoords,
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glm::ivec3(0),
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clampCeiling
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);
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value += filterCoefficient * _volume->get(clampedCoords);
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}
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}
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}
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value /= static_cast<float>(_filterSize.x * _filterSize.y * _filterSize.z);
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return value;
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}
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} // namespace openspace::volume
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