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sdk/extensions/authoringCommon/source/NvBlastExtAuthoringInternalCommon.h

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#ifndef NVBLASTINTERNALCOMMON_H
#define NVBLASTINTERNALCOMMON_H
#include "NvBlastExtAuthoringTypes.h"
#include "NvBlastPxSharedHelpers.h"
#include <PxVec2.h>
#include <PxVec3.h>
#include <PxPlane.h>
#include <PxBounds3.h>
#include <PxMath.h>
#include <algorithm>

namespace Nv
{
namespace Blast
{

struct EdgeWithParent
{
    uint32_t s, e; // Starting and ending vertices
    uint32_t parent; // Parent facet index
    EdgeWithParent() : s(0), e(0), parent(0) {}
    EdgeWithParent(uint32_t s, uint32_t e, uint32_t p) : s(s), e(e), parent(p) {}
};


struct EdgeComparator
{
    bool operator()(const EdgeWithParent& a, const EdgeWithParent& b) const
    {
        if (a.parent == b.parent)
        {
            if (a.s == b.s)
            {
                return a.e < b.e;
            }
            else
            {
                return a.s < b.s;
            }
        }
        else
        {
            return a.parent < b.parent;
        }
    }
};

inline bool operator<(const Edge& a, const Edge& b)
{
    if (a.s == b.s)
        return a.e < b.e;
    else
        return a.s < b.s;
}

enum ProjectionDirections
{
    YZ_PLANE = 1 << 1,
    XY_PLANE = 1 << 2,
    ZX_PLANE = 1 << 3,

    OPPOSITE_WINDING = 1 << 4
};

NV_FORCE_INLINE ProjectionDirections getProjectionDirection(const physx::PxVec3& normal)
{
    float maxv = std::max(std::abs(normal.x), std::max(std::abs(normal.y), std::abs(normal.z)));
    ProjectionDirections retVal;
    if (maxv == std::abs(normal.x))
    {
        retVal = YZ_PLANE;
        if (normal.x < 0) retVal = (ProjectionDirections)((int)retVal | (int)OPPOSITE_WINDING);
        return retVal;
    }
    if (maxv == std::abs(normal.y))
    {
        retVal = ZX_PLANE;
        if (normal.y > 0) retVal = (ProjectionDirections)((int)retVal | (int)OPPOSITE_WINDING);
        return retVal;
    }
    retVal = XY_PLANE;
    if (normal.z < 0) retVal = (ProjectionDirections)((int)retVal | (int)OPPOSITE_WINDING);
    return retVal;
}


NV_FORCE_INLINE physx::PxVec2 getProjectedPoint(const physx::PxVec3& point, ProjectionDirections dir)
{
    if (dir & YZ_PLANE)
    {
        return physx::PxVec2(point.y, point.z);
    }
    if (dir & ZX_PLANE)
    {
        return physx::PxVec2(point.x, point.z);
    }
    return physx::PxVec2(point.x, point.y);
}

NV_FORCE_INLINE physx::PxVec2 getProjectedPoint(const NvcVec3& point, ProjectionDirections dir)
{
    return getProjectedPoint((const physx::PxVec3&)point, dir);
}

NV_FORCE_INLINE physx::PxVec2 getProjectedPointWithWinding(const physx::PxVec3& point, ProjectionDirections dir)
{
    if (dir & YZ_PLANE)
    {
        if (dir & OPPOSITE_WINDING)
        {
            return physx::PxVec2(point.z, point.y);
        }
        else
        return physx::PxVec2(point.y, point.z);
    }
    if (dir & ZX_PLANE)
    {
        if (dir & OPPOSITE_WINDING)
        {
            return physx::PxVec2(point.z, point.x);
        }
        return physx::PxVec2(point.x, point.z);
    }
    if (dir & OPPOSITE_WINDING)
    {
        return physx::PxVec2(point.y, point.x);
    }
    return physx::PxVec2(point.x, point.y);
}



#define MAXIMUM_EXTENT 1000 * 1000 * 1000
#define BBOX_TEST_EPS 1e-5f 

NV_INLINE bool  weakBoundingBoxIntersection(const physx::PxBounds3& aBox, const physx::PxBounds3& bBox)
{
    if (std::max(aBox.minimum.x, bBox.minimum.x) > std::min(aBox.maximum.x, bBox.maximum.x) + BBOX_TEST_EPS)
        return false;
    if (std::max(aBox.minimum.y, bBox.minimum.y) > std::min(aBox.maximum.y, bBox.maximum.y) + BBOX_TEST_EPS)
        return false;
    if (std::max(aBox.minimum.z, bBox.minimum.z) > std::min(aBox.maximum.z, bBox.maximum.z) + BBOX_TEST_EPS)
        return false;
    return true;
}



NV_INLINE bool getPlaneSegmentIntersection(const physx::PxPlane& pl, const physx::PxVec3& a, const physx::PxVec3& b,
                                           physx::PxVec3& result)
{
    float div = (b - a).dot(pl.n);
    if (physx::PxAbs(div) < 0.0001f)
    {
        if (pl.contains(a))
        {
            result = a;
            return true;
        }
        else
        {
            return false;
        }
    }
    float t = (-a.dot(pl.n) - pl.d) / div;
    if (t < 0.0f || t > 1.0f)
    {
        return false;
    }
    result = (b - a) * t + a;
    return true;
}


#define POS_COMPARISON_OFFSET 1e-5f
#define NORM_COMPARISON_OFFSET 1e-3f

struct VrtComp
{
    bool operator()(const Vertex& a, const Vertex& b) const
    {
        if (a.p.x + POS_COMPARISON_OFFSET < b.p.x) return true;
        if (a.p.x - POS_COMPARISON_OFFSET > b.p.x) return false;
        if (a.p.y + POS_COMPARISON_OFFSET < b.p.y) return true;
        if (a.p.y - POS_COMPARISON_OFFSET > b.p.y) return false;
        if (a.p.z + POS_COMPARISON_OFFSET < b.p.z) return true;
        if (a.p.z - POS_COMPARISON_OFFSET > b.p.z) return false;

        if (a.n.x + NORM_COMPARISON_OFFSET < b.n.x) return true;
        if (a.n.x - NORM_COMPARISON_OFFSET > b.n.x) return false;
        if (a.n.y + NORM_COMPARISON_OFFSET < b.n.y) return true;
        if (a.n.y - NORM_COMPARISON_OFFSET > b.n.y) return false;
        if (a.n.z + NORM_COMPARISON_OFFSET < b.n.z) return true;
        if (a.n.z - NORM_COMPARISON_OFFSET > b.n.z) return false;


        if (a.uv[0].x + NORM_COMPARISON_OFFSET < b.uv[0].x) return true;
        if (a.uv[0].x - NORM_COMPARISON_OFFSET > b.uv[0].x) return false;
        if (a.uv[0].y + NORM_COMPARISON_OFFSET < b.uv[0].y) return true;
        return false;
    };
};

struct VrtPositionComparator
{
    bool operator()(const NvcVec3& a, const NvcVec3& b) const
    {
        if (a.x + POS_COMPARISON_OFFSET < b.x) return true;
        if (a.x - POS_COMPARISON_OFFSET > b.x) return false;
        if (a.y + POS_COMPARISON_OFFSET < b.y) return true;
        if (a.y - POS_COMPARISON_OFFSET > b.y) return false;
        if (a.z + POS_COMPARISON_OFFSET < b.z) return true;
        if (a.z - POS_COMPARISON_OFFSET > b.z) return false;
        return false;
    };
    bool operator()(const Vertex& a, const Vertex& b) const
    {
        return operator()(a.p, b.p);
    };
};


NV_INLINE float calculateCollisionHullVolume(const CollisionHull& hull)
{
    if (hull.pointsCount == 0)
    {
        return 0.0f;
    }

    // Find an approximate centroid for a more accurate calculation
    NvcVec3 centroid = { 0.0f, 0.0f, 0.0f };
    for (uint32_t i = 0; i < hull.pointsCount; ++i)
    {
        centroid = centroid + hull.points[i];
    }
    centroid = centroid / hull.pointsCount;

    float volume = 0.0f;

    for (uint32_t i = 0; i < hull.polygonDataCount; ++i)
    {
        const HullPolygon& poly = hull.polygonData[i];
        if (poly.vertexCount < 3)
        {
            continue;
        }
        const uint32_t i0 = hull.indices[poly.indexBase];
        uint32_t i1 = hull.indices[poly.indexBase + 1];
        for (uint32_t j = 2; j < poly.vertexCount; ++j)
        {
            const uint32_t i2 = hull.indices[poly.indexBase + j];
            const NvcVec3 a = hull.points[i0] - centroid;
            const NvcVec3 b = hull.points[i1] - centroid;
            const NvcVec3 c = hull.points[i2] - centroid;
            volume +=
                (a.x * b.y * c.z - a.x * b.z * c.y - a.y * b.x * c.z + a.y * b.z * c.x + a.z * b.x * c.y - a.z * b.y * c.x);
            i1 = i2;
        }
    }
    return (1.0f / 6.0f) * std::abs(volume);
}

}   // namespace Blast
}   // namespace Nv

#endif

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