88 lines
4.3 KiB
C++
88 lines
4.3 KiB
C++
/********************************************************************************
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* ReactPhysics3D physics library, http://www.reactphysics3d.com *
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* Copyright (c) 2010-2018 Daniel Chappuis *
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*********************************************************************************
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* *
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* This software is provided 'as-is', without any express or implied warranty. *
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* In no event will the authors be held liable for any damages arising from the *
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* use of this software. *
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* *
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* Permission is granted to anyone to use this software for any purpose, *
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* including commercial applications, and to alter it and redistribute it *
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* freely, subject to the following restrictions: *
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* *
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* 1. The origin of this software must not be misrepresented; you must not claim *
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* that you wrote the original software. If you use this software in a *
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* product, an acknowledgment in the product documentation would be *
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* appreciated but is not required. *
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* *
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* 2. Altered source versions must be plainly marked as such, and must not be *
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* misrepresented as being the original software. *
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* *
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* 3. This notice may not be removed or altered from any source distribution. *
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* *
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********************************************************************************/
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// Libraries
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#include "PolygonVertexArray.h"
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using namespace reactphysics3d;
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// Constructor
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/// Note that your data will not be copied into the PolygonVertexArray and
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/// therefore, you need to make sure that those data are always valid during
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/// the lifetime of the PolygonVertexArray.
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/**
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* @param nbVertices Number of vertices in the array
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* @param verticesStart Pointer to the start of the vertices data
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* @param verticesStride The number of bytes between two consecutive vertices in the array
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* @param indexesStart Pointer to the start of the face indices data
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* @param indexesStride The number of bytes between two consecutive face indices in the array
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* @param nbFaces The number of faces in the array
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* @param nbFaces Pointer to the start of the faces data
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* @param vertexDataType Data type of the vertices data
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* @param indexDataType Data type of the face indices data
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*/
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PolygonVertexArray::PolygonVertexArray(uint nbVertices, void* verticesStart, int verticesStride,
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void* indexesStart, int indexesStride,
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uint nbFaces, PolygonFace* facesStart,
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VertexDataType vertexDataType, IndexDataType indexDataType) {
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mNbVertices = nbVertices;
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mVerticesStart = reinterpret_cast<unsigned char*>(verticesStart);
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mVerticesStride = verticesStride;
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mIndicesStart = reinterpret_cast<unsigned char*>(indexesStart);
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mIndicesStride = indexesStride;
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mNbFaces = nbFaces;
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mPolygonFacesStart = facesStart;
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mVertexDataType = vertexDataType;
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mIndexDataType = indexDataType;
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}
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// Return the vertex index of a given vertex in a face
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/**
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* @return The index of a vertex (in the array of vertices data) of a given vertex in a face
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*/
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uint PolygonVertexArray::getVertexIndexInFace(uint faceIndex, uint noVertexInFace) const {
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assert(faceIndex < mNbFaces);
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// Get the face
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PolygonFace* face = getPolygonFace(faceIndex);
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assert(noVertexInFace < face->nbVertices);
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void* vertexIndexPointer = mIndicesStart + (face->indexBase + noVertexInFace) * mIndicesStride;
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if (mIndexDataType == PolygonVertexArray::IndexDataType::INDEX_INTEGER_TYPE) {
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return *((uint*)vertexIndexPointer);
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}
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else if (mIndexDataType == PolygonVertexArray::IndexDataType::INDEX_SHORT_TYPE) {
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return *((unsigned short*)vertexIndexPointer);
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}
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else {
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assert(false);
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}
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return 0;
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}
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