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96 lines
3.6 KiB
96 lines
3.6 KiB
#ifndef Magnum_MeshTools_CompressIndices_h |
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#define Magnum_MeshTools_CompressIndices_h |
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/* |
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This file is part of Magnum. |
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Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016 |
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Vladimír Vondruš <mosra@centrum.cz> |
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Permission is hereby granted, free of charge, to any person obtaining a |
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copy of this software and associated documentation files (the "Software"), |
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to deal in the Software without restriction, including without limitation |
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the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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and/or sell copies of the Software, and to permit persons to whom the |
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Software is furnished to do so, subject to the following conditions: |
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The above copyright notice and this permission notice shall be included |
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in 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 |
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THE 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 |
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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DEALINGS IN THE SOFTWARE. |
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*/ |
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/** @file |
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* @brief Function @ref Magnum::MeshTools::compressIndices() |
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*/ |
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#include <tuple> |
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#include "Magnum/Mesh.h" |
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#include "Magnum/MeshTools/visibility.h" |
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namespace Magnum { namespace MeshTools { |
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/** |
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@brief Compress vertex indices |
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@param indices Index array |
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@return Index range, type and compressed index array |
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This function takes index array and outputs them compressed to smallest |
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possible size. For example when your indices have maximum number 463, it's |
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wasteful to store them in array of 32bit integers, array of 16bit integers is |
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sufficient. |
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Example usage: |
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@code |
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std::vector<UnsignedInt> indices; |
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Containers::Array<char> indexData; |
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Mesh::IndexType indexType; |
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UnsignedInt indexStart, indexEnd; |
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std::tie(indexData, indexType, indexStart, indexEnd) = MeshTools::compressIndices(indices); |
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Buffer indexBuffer; |
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indexBuffer.setData(indexData, BufferUsage::StaticDraw); |
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Mesh mesh; |
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mesh.setCount(indices.size()) |
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.setIndexBuffer(indexBuffer, 0, indexType, indexStart, indexEnd); |
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@endcode |
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@see @ref compressIndicesAs() |
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@todo Extract IndexType out of Mesh class |
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*/ |
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std::tuple<Containers::Array<char>, Mesh::IndexType, UnsignedInt, UnsignedInt> MAGNUM_MESHTOOLS_EXPORT compressIndices(const std::vector<UnsignedInt>& indices); |
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/** |
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@brief Compress vertex indices as given type |
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The type can be either @ref Magnum::UnsignedByte "UnsignedByte", |
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@ref Magnum::UnsignedShort "UnsignedShort" or @ref Magnum::UnsignedInt "UnsignedInt". |
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Values in the index array are expected to be representable with given type. |
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Example usage: |
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@code |
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std::vector<UnsignedInt> indices; |
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Containers::Array<UnsignedShort> indexData = MeshTools::compressIndicesAs<UnsignedShort>(indices); |
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@endcode |
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@see @ref compressIndices() |
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*/ |
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template<class T> MAGNUM_MESHTOOLS_EXPORT Containers::Array<T> compressIndicesAs(const std::vector<UnsignedInt>& indices); |
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#if defined(CORRADE_TARGET_WINDOWS) && !defined(__MINGW32__) |
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extern template MAGNUM_MESHTOOLS_EXPORT Containers::Array<UnsignedByte> compressIndicesAs<UnsignedByte>(const std::vector<UnsignedInt>& indices); |
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extern template MAGNUM_MESHTOOLS_EXPORT Containers::Array<UnsignedShort> compressIndicesAs<UnsignedShort>(const std::vector<UnsignedInt>& indices); |
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extern template MAGNUM_MESHTOOLS_EXPORT Containers::Array<UnsignedInt> compressIndicesAs<UnsignedInt>(const std::vector<UnsignedInt>& indices); |
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#endif |
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}} |
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#endif
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