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46 lines
1.7 KiB
C++
46 lines
1.7 KiB
C++
/* Python-rgbcx Texture Compression Library
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Copyright (C) 2021 Andrew Cassidy <drewcassidy@me.com>
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Partially derived from rgbcx.h written by Richard Geldreich <richgel99@gmail.com>
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and licenced under the public domain
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "BC4Decoder.h"
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#include <assert.h> // for assert
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#include <array> // for array
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#include "../Color.h" // for Color
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#include "../ColorBlock.h" // for ColorBlock
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#include "../blocks.h" // for BC4Block
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#include "../ndebug.h" // for ndebug
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void rgbcx::BC4Decoder::DecodeBlock(Color4x4 dest, BC4Block *const block, size_t channel) const noexcept(ndebug) {
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auto l = block->GetLowAlpha();
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auto h = block->GetHighAlpha();
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auto values = BC4Block::GetValues(l, h);
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auto selectors = block->UnpackSelectors();
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for (unsigned y = 0; y < 4; y++) {
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for (unsigned x = 0; x < 4; x++) {
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const auto selector = selectors[y][x];
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assert(selector < 8);
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dest[y][x][channel] = values[selector];
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}
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}
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}
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