Function parseVertexWithColor

source/external/tinyobj/tiny_obj_loader.h:1096–1130

Extension: parse vertex with colors(6 items) Return 3: xyz, 4: xyzw, 6: xyzrgb `r`: red(case 6) or [w](case 4)

// Return 3: xyz, 4: xyzw, 6: xyzrgb
// `r`: red(case 6) or [w](case 4)
static inline int parseVertexWithColor(real_t *x, real_t *y, real_t *z,
                                       real_t *r, real_t *g, real_t *b,
                                       const char **token,
                                       const double default_x = 0.0,
                                       const double default_y = 0.0,
                                       const double default_z = 0.0) {
  // TODO: Check error
  (*x) = parseReal(token, default_x);
  (*y) = parseReal(token, default_y);
  (*z) = parseReal(token, default_z);

  // - 4 components(x, y, z, w) ot 6 components
  bool has_r = parseReal(token, r);

  if (!has_r) {
    (*r) = (*g) = (*b) = 1.0;
    return 3;
  }

  bool has_g = parseReal(token, g);

  if (!has_g) {
    (*g) = (*b) = 1.0;
    return 4;
  }

  bool has_b = parseReal(token, b);

  if (!has_b) {
    (*r) = (*g) = (*b) = 1.0;
    return 3;  // treated as xyz
  }

  return 6;
}

static inline bool parseOnOff(const char **token, bool default_value = true) {
  (*token) += strspn((*token), " \t");