mirror of
https://github.com/OpenSpace/OpenSpace.git
synced 2026-04-23 20:50:59 -05:00
Alexander Bock
82 lines
4.2 KiB
C++
82 lines
4.2 KiB
C++
/*****************************************************************************************
|
|
* *
|
|
* OpenSpace *
|
|
* *
|
|
* Copyright (c) 2014-2017 *
|
|
* *
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy of this *
|
|
* software and associated documentation files (the "Software"), to deal in the Software *
|
|
* without restriction, including without limitation the rights to use, copy, modify, *
|
|
* merge, publish, distribute, sublicense, and/or sell copies of the Software, and to *
|
|
* permit persons to whom the Software is furnished to do so, subject to the following *
|
|
* conditions: *
|
|
* *
|
|
* The above copyright notice and this permission notice shall be included in all copies *
|
|
* or substantial portions of the Software. *
|
|
* *
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, *
|
|
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A *
|
|
* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT *
|
|
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF *
|
|
* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE *
|
|
* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
|
|
****************************************************************************************/
|
|
|
|
namespace openspace {
|
|
|
|
template <typename VolumeType>
|
|
VolumeSampler<VolumeType>::VolumeSampler(const VolumeType& volume, const glm::vec3& filterSize) {
|
|
// Only accept filter sizes of size 1, 3, 5, 7...
|
|
// Round down to closest odd number.
|
|
_filterSize = static_cast<glm::ivec3>((filterSize - glm::vec3(1.0)) * glm::vec3(0.5)) *
|
|
glm::ivec3(2) + glm::ivec3(1);
|
|
|
|
_volume = &volume;
|
|
}
|
|
|
|
template <typename VolumeType>
|
|
typename VolumeType::VoxelType VolumeSampler<VolumeType>::sample(const glm::vec3& position) const {
|
|
glm::ivec3 flooredPos = static_cast<glm::ivec3>(glm::floor(position));
|
|
glm::vec3 t = glm::fract(position);
|
|
|
|
// t is now in interval [0, 1[ (never 1)
|
|
glm::ivec3 minCoords = flooredPos - _filterSize / 2; // min coord to sample from
|
|
glm::ivec3 maxCoords = minCoords + _filterSize; // max coords to sample from, including interpolation.
|
|
glm::ivec3 clampCeiling = _volume->dimensions() - glm::ivec3(1);
|
|
|
|
typename VolumeType::VoxelType value;
|
|
for (int z = minCoords.z; z <= maxCoords.z; z++) {
|
|
for (int y = minCoords.y; y <= maxCoords.y; y++) {
|
|
for (int x = minCoords.x; x <= maxCoords.x; x++) {
|
|
glm::ivec3 sampleCoords = glm::ivec3(x, y, z);
|
|
float filterCoefficient = 1.0;
|
|
|
|
if (x == minCoords.x) {
|
|
filterCoefficient *= (1.0 - t.x);
|
|
} else if (x == maxCoords.x) {
|
|
filterCoefficient *= t.x;
|
|
}
|
|
if (y == minCoords.y) {
|
|
filterCoefficient *= (1.0 - t.y);
|
|
} else if (y == maxCoords.y) {
|
|
filterCoefficient *= t.y;
|
|
}
|
|
if (z == minCoords.z) {
|
|
filterCoefficient *= (1.0 - t.z);
|
|
} else if (z == maxCoords.z) {
|
|
filterCoefficient *= t.z;
|
|
}
|
|
|
|
glm::ivec3 clampedCoords = glm::clamp(sampleCoords, glm::ivec3(0), clampCeiling);
|
|
value += filterCoefficient * _volume->get(clampedCoords);
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
value /= static_cast<float>(_filterSize.x * _filterSize.y * _filterSize.z);
|
|
return value;
|
|
}
|
|
|
|
} // namespace openspace
|