1 files changed, 119 insertions, 0 deletions
diff --git a/thirdparty/thekla_atlas/nvmesh/MeshBuilder.h b/thirdparty/thekla_atlas/nvmesh/MeshBuilder.h
new file mode 100644
index 0000000000..5b3af3fc1d
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+++ b/thirdparty/thekla_atlas/nvmesh/MeshBuilder.h
@@ -0,0 +1,119 @@
+// This code is in the public domain -- castanyo@yahoo.es
+
+#pragma once
+#ifndef NV_MESH_MESHBUILDER_H
+#define NV_MESH_MESHBUILDER_H
+
+#include "nvmesh.h"
+#include "nvcore/Array.h"
+#include "nvmath/Vector.h"
+
+namespace nv
+{
+    class String;
+    class TriMesh;
+    class QuadTriMesh;
+    namespace HalfEdge { class Mesh; }
+
+
+    /// Mesh builder is a helper class for importers.
+    /// Ideally it should handle any vertex data, but for now it only accepts positions, 
+    /// normals and texcoords.
+    class MeshBuilder
+    {
+        NV_FORBID_COPY(MeshBuilder);
+        NV_FORBID_HEAPALLOC();
+    public:
+        MeshBuilder();
+        ~MeshBuilder();
+
+        // Builder methods.
+        uint addPosition(const Vector3 & v);
+        uint addNormal(const Vector3 & v);
+        uint addTexCoord(const Vector2 & v, uint set = 0);
+        uint addColor(const Vector4 & v, uint set = 0);
+
+        void beginGroup(uint id);
+        void endGroup();
+
+        uint addMaterial(const char * name);
+        void beginMaterial(uint id);
+        void endMaterial();
+
+        void beginPolygon(uint id = 0);
+        uint addVertex(uint p, uint n = NIL, uint t0 = NIL, uint t1 = NIL, uint c0 = NIL, uint c1 = NIL, uint c2 = NIL);
+        uint addVertex(const Vector3 & p);
+        //uint addVertex(const Vector3 & p, const Vector3 & n, const Vector2 & t0 = Vector2(0), const Vector2 & t1 = Vector2(0), const Vector4 & c0 = Vector4(0), const Vector4 & c1 = Vector4(0));
+        bool endPolygon();
+
+        uint weldPositions();
+        uint weldNormals();
+        uint weldTexCoords(uint set = 0);
+        uint weldColors(uint set = 0);
+        void weldVertices();
+
+        void optimize(); // eliminate duplicate components and duplicate vertices.
+        void removeUnusedMaterials(Array<uint> & newMaterialId);
+        void sortFacesByGroup();
+        void sortFacesByMaterial();
+
+        void done();
+        void reset();
+
+        // Hints.
+        void hintTriangleCount(uint count);
+        void hintVertexCount(uint count);
+        void hintPositionCount(uint count);
+        void hintNormalCount(uint count);
+        void hintTexCoordCount(uint count, uint set = 0);
+        void hintColorCount(uint count, uint set = 0);
+
+        // Helpers.
+        void addTriangle(uint v0, uint v1, uint v2);
+        void addQuad(uint v0, uint v1, uint v2, uint v3);
+
+        // Get result.
+        TriMesh * buildTriMesh() const;
+        QuadTriMesh * buildQuadTriMesh() const;
+
+        enum Error {
+            Error_None,
+            Error_NonManifoldEdge,
+            Error_NonManifoldVertex,
+        };
+
+        HalfEdge::Mesh * buildHalfEdgeMesh(bool weldPositions, Error * error = NULL, Array<uint> * badFaces = NULL) const;
+
+        bool buildPositions(Array<Vector3> & positionArray);
+        bool buildNormals(Array<Vector3> & normalArray);
+        bool buildTexCoords(Array<Vector2> & texCoordArray, uint set = 0);
+        bool buildColors(Array<Vector4> & colorArray, uint set = 0);
+		void buildVertexToPositionMap(Array<int> & map);
+
+
+        // Expose attribute indices of the unified vertex array.
+        uint vertexCount() const;
+        
+        uint positionCount() const;
+        uint normalCount() const;
+        uint texCoordCount(uint set = 0) const;
+        uint colorCount(uint set = 0) const;
+
+        uint materialCount() const;
+        const char * material(uint i) const;
+
+        uint positionIndex(uint vertex) const;
+        uint normalIndex(uint vertex) const;
+        uint texCoordIndex(uint vertex, uint set = 0) const;
+        uint colorIndex(uint vertex, uint set = 0) const;
+
+    private:
+
+        struct PrivateData;
+        PrivateData * d;
+
+    };
+
+} // nv namespace
+
+#endif // NV_MESH_MESHBUILDER_H