UV Sphereを描画（２）-頂点配列を作ってから表示

struct UVSphere {
  std::vector<glm::vec3> points;
  int stackCount;
  int SectorCount;
};
 

// 球の頂点配列を作成
UVSphere create_uv_sphere(const int stackCount, const int SectorCount, const float r) {

  std::vector<glm::vec3> points;
  for (int stackStep = 0; stackStep < stackCount+1; stackStep++) {

    for (int sectorStep = 0; sectorStep < SectorCount+1; sectorStep++) {

      points.push_back(getPoint(sectorStep, SectorCount, stackStep, stackCount, r));

    }

  }
  return UVSphere{ points, stackCount, SectorCount };
}

// 頂点配列から球を描画
void draw_uv_sphere(const UVSphere& uvq) {

  int Width = uvq.SectorCount+1;
  int Height = uvq.stackCount+1;

  for (int y = 0; y < Height - 1; y++) {
    for (int x = 0; x < Width - 1; x++) {
      int x2 = x + 1;
      int y2 = y + 1;

      int i1 = y * Width + x;
      int i2 = y2 * Width + x;
      int i3 = y2 * Width + x2;
      int i4 = y * Width + x2;

      glm::vec3 k1 = uvq.points[i1];
      glm::vec3 k2 = uvq.points[i2];
      glm::vec3 k3 = uvq.points[i3];
      glm::vec3 k4 = uvq.points[i4];

      // 四角形で描画
      glBegin(GL_LINE_LOOP);
      glVertex3fv(glm::value_ptr(k1));
      glVertex3fv(glm::value_ptr(k2));
      glVertex3fv(glm::value_ptr(k3));
      glVertex3fv(glm::value_ptr(k4));
      glEnd();

    }
  }
}