167 lines
4.6 KiB
C++
167 lines
4.6 KiB
C++
//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of NVIDIA CORPORATION nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Copyright (c) 2008-2019 NVIDIA Corporation. All rights reserved.
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// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
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// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
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#ifndef PX_PHYSICS_GEOMUTILS_NX_SIMPLETRIANGLEMESH
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#define PX_PHYSICS_GEOMUTILS_NX_SIMPLETRIANGLEMESH
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/** \addtogroup geomutils
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@{
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*/
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#include "foundation/PxVec3.h"
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#include "foundation/PxFlags.h"
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#include "common/PxCoreUtilityTypes.h"
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#include "common/PxPhysXCommonConfig.h"
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#if !PX_DOXYGEN
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namespace physx
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{
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#endif
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/**
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\brief Enum with flag values to be used in PxSimpleTriangleMesh::flags.
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*/
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struct PxMeshFlag
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{
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enum Enum
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{
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/**
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\brief Specifies if the SDK should flip normals.
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The PhysX libraries assume that the face normal of a triangle with vertices [a,b,c] can be computed as:
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edge1 = b-a
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edge2 = c-a
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face_normal = edge1 x edge2.
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Note: This is the same as a counterclockwise winding in a right handed coordinate system or
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alternatively a clockwise winding order in a left handed coordinate system.
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If this does not match the winding order for your triangles, raise the below flag.
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*/
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eFLIPNORMALS = (1<<0),
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e16_BIT_INDICES = (1<<1) //!< Denotes the use of 16-bit vertex indices
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};
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};
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/**
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\brief collection of set bits defined in PxMeshFlag.
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@see PxMeshFlag
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*/
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typedef PxFlags<PxMeshFlag::Enum,PxU16> PxMeshFlags;
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PX_FLAGS_OPERATORS(PxMeshFlag::Enum,PxU16)
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/**
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\brief A structure describing a triangle mesh.
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*/
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class PxSimpleTriangleMesh
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{
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public:
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/**
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\brief Pointer to first vertex point.
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*/
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PxBoundedData points;
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/**
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\brief Pointer to first triangle.
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Caller may add triangleStrideBytes bytes to the pointer to access the next triangle.
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These are triplets of 0 based indices:
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vert0 vert1 vert2
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vert0 vert1 vert2
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vert0 vert1 vert2
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...
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where vertex is either a 32 or 16 bit unsigned integer. There are numTriangles*3 indices.
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This is declared as a void pointer because it is actually either an PxU16 or a PxU32 pointer.
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*/
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PxBoundedData triangles;
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/**
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\brief Flags bits, combined from values of the enum ::PxMeshFlag
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*/
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PxMeshFlags flags;
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/**
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\brief constructor sets to default.
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*/
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PX_INLINE PxSimpleTriangleMesh();
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/**
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\brief (re)sets the structure to the default.
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*/
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PX_INLINE void setToDefault();
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/**
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\brief returns true if the current settings are valid
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*/
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PX_INLINE bool isValid() const;
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};
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PX_INLINE PxSimpleTriangleMesh::PxSimpleTriangleMesh()
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{
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}
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PX_INLINE void PxSimpleTriangleMesh::setToDefault()
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{
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*this = PxSimpleTriangleMesh();
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}
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PX_INLINE bool PxSimpleTriangleMesh::isValid() const
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{
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// Check geometry
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if(points.count > 0xffff && flags & PxMeshFlag::e16_BIT_INDICES)
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return false;
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if(!points.data)
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return false;
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if(points.stride < sizeof(PxVec3)) //should be at least one point's worth of data
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return false;
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// Check topology
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// The triangles pointer is not mandatory
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if(triangles.data)
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{
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// Indexed mesh
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PxU32 limit = (flags & PxMeshFlag::e16_BIT_INDICES) ? sizeof(PxU16)*3 : sizeof(PxU32)*3;
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if(triangles.stride < limit)
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return false;
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}
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return true;
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}
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#if !PX_DOXYGEN
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} // namespace physx
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#endif
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/** @} */
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#endif
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