InputGeom.h

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//
// Copyright (c) 2009-2010 Mikko Mononen memon@inside.org
//
// 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.
//
 
#pragma once
 
#include "PartitionedMesh.h"
 
#include <string>
#include <vector>
 
struct PartitionedMesh;
class rcContext;
struct duDebugDraw;
 
static constexpr int MAX_CONVEXVOL_PTS = 12;
struct ConvexVolume
{
    float verts[MAX_CONVEXVOL_PTS * 3] = {};
    int nverts = 0;
    float hmin = 0.0f;
    float hmax = 0.0f;
    int area = 0;
};
 
struct BuildSettings
{
    float cellSize = 0;
    float cellHeight = 0;
    float agentHeight = 0;
    float agentRadius = 0;
    float agentMaxClimb = 0;
    float agentMaxSlope = 0;
    float regionMinSize = 0;
    float regionMergeSize = 0;
    float edgeMaxLen = 0;
    float edgeMaxError = 0;
    int vertsPerPoly = 0;
    float detailSampleDist = 0;
    float detailSampleMaxError = 0;
    int partitionType = 0;
    float navMeshBMin[3]{};
    float navMeshBMax[3]{};
    float tileSize = 0;
};
 
struct Mesh
{
    std::vector<float> verts;
    std::vector<int> tris;
    std::vector<float> normals;  // face normals
 
    void reset()
    {
        verts.clear();
        tris.clear();
        normals.clear();
    }
 
    [[nodiscard]] int getVertCount() const { return static_cast<int>(verts.size()) / 3; }
    [[nodiscard]] int getTriCount() const { return static_cast<int>(tris.size()) / 3; }
 
    void readFromObj(char* buf, size_t bufLen);
};
 
class InputGeom
{
    BuildSettings buildSettings;
    bool hasBuildSettings = false;
 
public:
    std::string filename;
 
    Mesh mesh;
    float meshBoundsMin[3] = {};
    float meshBoundsMax[3] = {};
 
    PartitionedMesh partitionedMesh;
 
    std::vector<float> offmeshConnVerts;
    std::vector<float> offmeshConnRadius;
    std::vector<unsigned char> offmeshConnBidirectional;
    std::vector<unsigned char> offmeshConnArea;
    std::vector<unsigned short> offmeshConnFlags;
    std::vector<unsigned int> offmeshConnId;
 
    std::vector<ConvexVolume> convexVolumes;
 
    bool load(rcContext* ctx, const std::string& filepath);
    bool saveGeomSet(const BuildSettings* settings);
 
    [[nodiscard]] const float* getNavMeshBoundsMin() const { return hasBuildSettings ? buildSettings.navMeshBMin : meshBoundsMin; }
    [[nodiscard]] const float* getNavMeshBoundsMax() const { return hasBuildSettings ? buildSettings.navMeshBMax : meshBoundsMax; }
    [[nodiscard]] const BuildSettings* getBuildSettings() const { return hasBuildSettings ? &buildSettings : nullptr; }
    bool raycastMesh(float* src, float* dst, float& tmin) const;
 
    void addOffMeshConnection(const float* startPos, const float* endPos, float radius, unsigned char bidirectional, unsigned char area, unsigned short flags);
    void deleteOffMeshConnection(int i);
    void drawOffMeshConnections(duDebugDraw* dd, bool highlight = false);
 
    void addConvexVolume(const float* verts, int nverts, float minh, float maxh, unsigned char area);
    void deleteConvexVolume(int i);
    void drawConvexVolumes(duDebugDraw* dd);
 
private:
    bool loadMesh(rcContext* ctx, const std::string& filepath);
    bool loadGeomSet(rcContext* ctx, const std::string& filepath);
    bool loadGeomSet(rcContext* ctx, char* buffer, size_t bufferLen);
 
    void clearOffMeshConnections()
    {
        offmeshConnVerts.clear();
        offmeshConnRadius.clear();
        offmeshConnBidirectional.clear();
        offmeshConnArea.clear();
        offmeshConnFlags.clear();
        offmeshConnId.clear();
    }
};