_destroyTexture( texture ) {

		if ( this.has( texture ) === true ) {

			this.backend.destroySampler( texture );
			this.backend.destroyTexture( texture );

			this.delete( texture );

			this.info.memory.textures --;

		}

	}
Frees internal resource when the given texture isn't
required anymore.

@param {Texture} texture - The texture to destroy.