zscript-doc/api/drawing/TextureID.md

TextureID

Texture IDs can be explicitly converted to integers, but not the other way around. You can add and subtract integers with a textureid, however. (This only works with the integer on the right hand side.)

struct TextureID
{
   bool Exists() const;
   bool IsNull() const;
   bool IsValid() const;
   void SetInvalid();
   void SetNull();
}

• Exists

  Checks if the texture exists within the texture manager at all.

• IsNull

  Checks if the texture is the null index (0.)

• IsValid

  Checks if the texture index is not the invalid index (-1.)

• SetInvalid

  Sets the texture index to -1.

• SetNull

  Sets the texture index to 0.

  The proper way to zero-initialize a textureid is:

  textureid tex;
  tex.SetNull();