glIsTexture — determine if a name corresponds to a texture
Specifies a value that may be the name of a texture.
texture is currently the name of a texture.
texture is zero, or is a non-zero value that is not currently the
name of a texture, or if an error occurs,
|Function / Feature Name||2.0||2.1||3.0||3.1||3.2||3.3||4.0||4.1||4.2||4.3||4.4||4.5|
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