81 lines
2.5 KiB
C++
81 lines
2.5 KiB
C++
// Copyright (c) 2012-2022 Wojciech Figat. All rights reserved.
|
|
|
|
#pragma once
|
|
|
|
#if COMPILE_WITH_MODEL_TOOL
|
|
|
|
#include "Engine/Core/Config.h"
|
|
#include "Engine/Core/Types/BaseTypes.h"
|
|
#include "Engine/Platform/Platform.h"
|
|
|
|
/// <summary>
|
|
/// The VertexTriangleAdjacency class computes a vertex-triangle adjacency map from a given index buffer.
|
|
/// </summary>
|
|
class VertexTriangleAdjacency
|
|
{
|
|
public:
|
|
|
|
/// <summary>
|
|
/// Construction from an existing index buffer
|
|
/// </summary>
|
|
/// <param name="indices">The index buffer.</param>
|
|
/// <param name="indicesCount">The number of triangles in the buffer.</param>
|
|
/// <param name="vertexCount">The number of referenced vertices. This value is computed automatically if 0 is specified.</param>
|
|
/// <param name="computeNumTriangles">If you want the class to compute a list containing the number of referenced triangles per vertex per vertex - pass true.</param>
|
|
VertexTriangleAdjacency(uint32* indices, int32 indicesCount, uint32 vertexCount = 0, bool computeNumTriangles = true);
|
|
|
|
/// <summary>
|
|
/// Destructor
|
|
/// </summary>
|
|
~VertexTriangleAdjacency();
|
|
|
|
public:
|
|
|
|
/// <summary>
|
|
/// The offset table
|
|
/// </summary>
|
|
uint32* OffsetTable;
|
|
|
|
/// <summary>
|
|
/// The adjacency table.
|
|
/// </summary>
|
|
uint32* AdjacencyTable;
|
|
|
|
/// <summary>
|
|
/// The table containing the number of referenced triangles per vertex.
|
|
/// </summary>
|
|
uint32* LiveTriangles;
|
|
|
|
/// <summary>
|
|
/// The total number of referenced vertices.
|
|
/// </summary>
|
|
uint32 NumVertices;
|
|
|
|
public:
|
|
|
|
/// <summary>
|
|
/// Gets all triangles adjacent to a vertex.
|
|
/// </summary>
|
|
/// <param name="vertexIndex">The index of the vertex.</param>
|
|
/// <returns>A pointer to the adjacency list.</returns>
|
|
uint32* GetAdjacentTriangles(uint32 vertexIndex) const
|
|
{
|
|
ASSERT(vertexIndex >= 0 && vertexIndex < NumVertices);
|
|
return &AdjacencyTable[OffsetTable[vertexIndex]];
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the number of triangles that are referenced by a vertex. This function returns a reference that can be modified.
|
|
/// </summary>
|
|
/// <param name="vertexIndex">The index of the vertex.</param>
|
|
/// <returns>The number of referenced triangles</returns>
|
|
uint32& GetNumTrianglesPtr(uint32 vertexIndex) const
|
|
{
|
|
ASSERT(vertexIndex >= 0 && vertexIndex < NumVertices);
|
|
ASSERT(nullptr != LiveTriangles);
|
|
return LiveTriangles[vertexIndex];
|
|
}
|
|
};
|
|
|
|
#endif
|