Structs:TextureID

Note: This feature is for ZScript only.

A TextureID is an internal number of a graphic used by GZDoom (contrary to the name, this includes any type of graphic, such as level textures, sprites, and graphics).

The TextureID struct contains methods that can be utilized on TextureID pointers. TextureID of an image can be obtained and manipulated by using the methods defined in the TexMan struct.

Methods

Dynamic

All of these methods are dynamic and must be called on a TextureID pointer.

• bool IsValid()

Returns true if the TextureID is a valid texture that can be rendered. (This means the texture exists and isn't a null texture.)

• bool IsNull()

Returns true if the TextureID is a null texture. (This means the texture exists but is explicitly defined as null.)

• bool Exists()

Returns true if the TextureID is an existing texture (returns true for null textures as well).

• void SetInvalid()

Marks the TextureID pointer as invalid for future checks.

• void SetNull()

Marks the TextureID pointer as null for future checks. This is necessary, because something like foo = null doesn't work on TextureID-type values.

Existing, null and valid textures

The relation between IsValid(), IsNull() and Exists() checks works as follows:

Texture type	Exists	IsNull	IsValid
Non-existent texture	false	false	false
Null texture	TRUE	TRUE	false
Regular texture	TRUE	false	TRUE

Note:

• TNT1 is considered a valid and non-null texture.
• If an actor whose sprites don't exist are spawned dynamically in the world (via Spawn() or its derivatives), their sprites are dynamically remapped to TNT1 to avoid errors. As a result, calling IsValid() on the results of GetSpriteTexture() will yield a valid, non-null result. Use <statepointer>.ValidateSpriteFrame() to check a state is using an existing sprite.