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52 lines
2.5 KiB
52 lines
2.5 KiB
#ifndef Magnum_GL_Implementation_imageProperties_h |
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#define Magnum_GL_Implementation_imageProperties_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, 2017, 2018, 2019, |
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2020, 2021, 2022, 2023, 2024, 2025 |
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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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#include "Magnum/Math/Vector3.h" |
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namespace Magnum { namespace GL { namespace Implementation { |
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/* Used in compressed image upload functions. Unlike what common sense and |
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various robustness extensions would imply, where the size is the memory |
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range occupied by the data given various pixel storage parameters, it's |
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instead expected to stupidly be just the image dimensions (*not* row length |
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etc) in whole blocks. Which has absolutely NO RELATION to the actual memory |
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and thus is completely useless for enforcing any memory security in the |
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driver, it's only there to bully users. My suspicion is that whoever did |
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ARB_compressed_texture_pixel_storage (which makes skip, row length etc. |
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possible for compressed formats) didn't bother thinking about what the |
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existing parameter is for, just left it unchanged, and nobody else in the |
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commitee bothered either. */ |
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template<class T> std::size_t occupiedCompressedImageDataSize(const T& image) { |
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const auto realBlockCount = Math::Vector3<std::size_t>{(Vector3i::pad(image.size(), 1) + image.blockSize() - Vector3i{1})/image.blockSize()}; |
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return realBlockCount.product()*image.blockDataSize(); |
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} |
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}}} |
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#endif
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