reactphysics3d/src/collision/PolygonVertexArray.cpp
2018-04-30 22:15:53 +02:00

88 lines
4.3 KiB
C++

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