mirror of
https://github.com/drewcassidy/quicktex.git
synced 2024-09-13 06:37:34 +00:00
46 lines
1.6 KiB
C++
46 lines
1.6 KiB
C++
/* Python-rgbcx Texture Compression Library
|
|
Copyright (C) 2021 Andrew Cassidy <drewcassidy@me.com>
|
|
Partially derived from rgbcx.h written by Richard Geldreich <richgel99@gmail.com>
|
|
and licenced under the public domain
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "BC4Decoder.h"
|
|
|
|
#include <assert.h> // for assert
|
|
|
|
#include <array> // for array
|
|
|
|
#include "../BlockView.h" // for ColorBlock
|
|
#include "../Color.h" // for Color
|
|
#include "../ndebug.h" // for ndebug
|
|
#include "BC4Block.h"
|
|
|
|
void rgbcx::BC4Decoder::DecodeBlock(Byte4x4 dest, BC4Block *const block) const noexcept(ndebug) {
|
|
auto l = block->GetLowAlpha();
|
|
auto h = block->GetHighAlpha();
|
|
|
|
auto values = BC4Block::GetValues(l, h);
|
|
auto selectors = block->UnpackSelectors();
|
|
|
|
for (unsigned y = 0; y < 4; y++) {
|
|
for (unsigned x = 0; x < 4; x++) {
|
|
const auto selector = selectors[y][x];
|
|
assert(selector < 8);
|
|
dest.Set(x, y, values[selector]);
|
|
}
|
|
}
|
|
}
|