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91 lines
3.4 KiB
C++
91 lines
3.4 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 "interpolator.h"
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#include <cassert>
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// region InterpolatorIdeal implementation
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int rgbcx::InterpolatorIdeal::Interpolate5(int v0, int v1) { return Interpolate5or6(v0, v1); }
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int rgbcx::InterpolatorIdeal::Interpolate6(int v0, int v1) { return Interpolate5or6(v0, v1); }
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int rgbcx::InterpolatorIdeal::InterpolateHalf5(int v0, int v1) { return InterpolateHalf5or6(v0, v1); }
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int rgbcx::InterpolatorIdeal::InterpolateHalf6(int v0, int v1) { return InterpolateHalf5or6(v0, v1); }
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int rgbcx::InterpolatorIdeal::Interpolate5or6(int v0, int v1) {
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assert(v0 < 256 && v1 < 256);
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return (v0 * 2 + v1) / 3;
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}
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int rgbcx::InterpolatorIdeal::InterpolateHalf5or6(int v0, int v1) {
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assert(v0 < 256 && v1 < 256);
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return (v0 + v1) / 2;
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}
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// endregion
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// region InterpolatorIdealRound implementation
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int rgbcx::InterpolatorIdealRound::Interpolate5(int v0, int v1) { return Interpolate5or6Round(v0, v1); }
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int rgbcx::InterpolatorIdealRound::Interpolate6(int v0, int v1) { return Interpolate5or6Round(v0, v1); }
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int rgbcx::InterpolatorIdealRound::Interpolate5or6Round(int v0, int v1) {
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assert(v0 < 256 && v1 < 256);
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return (v0 * 2 + v1 + 1) / 3;
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}
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// endregion
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// region InterpolatorNvidia implementation
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int rgbcx::InterpolatorNvidia::Interpolate5(int v0, int v1) {
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assert(v0 < 32 && v1 < 32);
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return ((2 * v0 + v1) * 22) / 8;
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}
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int rgbcx::InterpolatorNvidia::Interpolate6(int v0, int v1) {
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assert(v0 < 256 && v1 < 256);
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const int gdiff = v1 - v0;
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return (256 * v0 + (gdiff / 4) + 128 + gdiff * 80) / 256;
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}
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int rgbcx::InterpolatorNvidia::InterpolateHalf5(int v0, int v1) {
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assert(v0 < 32 && v1 < 32);
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return ((v0 + v1) * 33) / 8;
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}
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int rgbcx::InterpolatorNvidia::InterpolateHalf6(int v0, int v1) {
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assert(v0 < 256 && v1 < 256);
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const int gdiff = v1 - v0;
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return (256 * v0 + gdiff / 4 + 128 + gdiff * 128) / 256;
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}
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// endregion
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// region InterpolatorAMD implementation
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int rgbcx::InterpolatorAMD::Interpolate5(int v0, int v1) { return Interpolate5or6(v0, v1); }
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int rgbcx::InterpolatorAMD::Interpolate6(int v0, int v1) { return Interpolate5or6(v0, v1); }
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int rgbcx::InterpolatorAMD::InterpolateHalf5(int v0, int v1) { return InterpolateHalf5or6(v0, v1); }
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int rgbcx::InterpolatorAMD::InterpolateHalf6(int v0, int v1) { return InterpolateHalf5or6(v0, v1); }
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int rgbcx::InterpolatorAMD::Interpolate5or6(int v0, int v1) {
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assert(v0 < 256 && v1 < 256);
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return (v0 * 43 + v1 * 21 + 32) >> 6;
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}
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int rgbcx::InterpolatorAMD::InterpolateHalf5or6(int v0, int v1) {
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assert(v0 < 256 && v1 < 256);
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return (v0 + v1 + 1) >> 1;
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}
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// endregion
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