GeoPatchContext.h

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// Copyright © 2008-2023 Pioneer Developers. See AUTHORS.txt for details
// Licensed under the terms of the GPL v3. See licenses/GPL-3.txt
 
#ifndef _GEOPATCHCONTEXT_H
#define _GEOPATCHCONTEXT_H
 
#include <SDL_stdinc.h>
 
#include "Color.h"
#include "graphics/VertexBuffer.h"
#include "vector3.h"
 
#include <deque>
 
// maximumpatch depth
#define GEOPATCH_MAX_DEPTH 15
 
class GeoPatchContext : public RefCounted {
public:
    struct VBOVertex {
        vector3f pos;
        vector3f norm;
        Color4ub col;
        vector2f uv;
    };
 
    GeoPatchContext(const int _edgeLen)
    {
        m_edgeLen = _edgeLen + 2; // +2 for the skirt
        Init();
    }
 
    static void Refresh()
    {
        Init();
    }
 
    static void Init();
 
    static inline Graphics::IndexBuffer *GetIndexBuffer() { return m_indices.Get(); }
 
    static inline int NUMVERTICES() { return m_edgeLen * m_edgeLen; }
 
    static inline int GetEdgeLen() { return m_edgeLen; }
    static inline int GetNumTris() { return m_numTris; }
    static inline double GetFrac() { return m_frac; }
 
private:
    static int m_edgeLen;
    static int m_numTris;
 
    static double m_frac;
 
    static inline int VBO_COUNT_HI_EDGE() { return 3 * (m_edgeLen - 1); }
    static inline int VBO_COUNT_MID_IDX() { return (4 * 3 * (m_edgeLen - 3)) + 2 * (m_edgeLen - 3) * (m_edgeLen - 3) * 3; }
    //                                            ^^ serrated teeth bit  ^^^ square inner bit
 
    static inline int IDX_VBO_LO_OFFSET(const int i) { return i * sizeof(Uint32) * 3 * (m_edgeLen / 2); }
    static inline int IDX_VBO_HI_OFFSET(const int i) { return (i * sizeof(Uint32) * VBO_COUNT_HI_EDGE()) + IDX_VBO_LO_OFFSET(4); }
 
    static RefCountedPtr<Graphics::IndexBuffer> m_indices;
    static int m_prevEdgeLen;
 
    static void GenerateIndices();
};
 
#endif /* _GEOPATCHCONTEXT_H */