src/invert.cpp

Wed, 08 Jun 2022 20:41:21 +0300

author
Teemu Piippo <teemu@hecknology.net>
date
Wed, 08 Jun 2022 20:41:21 +0300
changeset 205
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parent 200
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child 206
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permissions
-rw-r--r--

Refactor colors.cpp/.h

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1 /*
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2 * LDForge: LDraw parts authoring CAD
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3 * Copyright (C) 2013 - 2020 Teemu Piippo
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4 *
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5 * This program is free software: you can redistribute it and/or modify
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6 * it under the terms of the GNU General Public License as published by
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7 * the Free Software Foundation, either version 3 of the License, or
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8 * (at your option) any later version.
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9 *
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10 * This program is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 * GNU General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU General Public License
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16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 */
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19 #include "main.h"
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20 #include "model.h"
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21 #include "gl/common.h"
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22 #include "invert.h"
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23 #include "documentmanager.h"
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25 /*
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26 * Returns a matrix that causes a flip on the given dimension.
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27 */
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28 glm::mat4 math::flipmatrix(const Axis dimension)
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29 {
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30 glm::mat4 result = glm::mat4();
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31 const int k = static_cast<int>(dimension);
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32 result[k][k] = -1;
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33 return result;
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34 }
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36 /*
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37 * Inverts the winding of a polygon.
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38 */
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39 void gl::invert(gl::Polygon& polygon)
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40 {
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41 switch (polygon.numPolygonVertices())
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42 {
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43 case 2:
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44 case 3:
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45 // 0 1 => 1 0
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46 // 0 1 2 => 1 0 2
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47 std::swap(polygon.vertices[0], polygon.vertices[1]);
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48 break;
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49 case 4:
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50 // 0 1 2 3 => 0 3 2 1
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51 std::swap(polygon.vertices[1], polygon.vertices[3]);
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52 break;
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53 }
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54 }

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