Performs a texture lookup within the visual shader graph. Performs a lookup operation on the provided texture, with support for multiple texture sources to choose from. Determines the source for the lookup. See [enum Source] for options. The source texture, if needed for the selected [member source]. Specifies the type of the texture if [member source] is set to [constant SOURCE_TEXTURE]. See [enum TextureType] for options. Use the texture given as an argument for this function. Use the current viewport's texture as the source. Use the texture from this shader's texture built-in (e.g. a texture of a [Sprite]). Use the texture from this shader's normal map built-in. Use the depth texture available for this shader. Use the texture provided in the input port for this function. No hints are added to the uniform declaration. Adds [code]hint_albedo[/code] as hint to the uniform declaration for proper sRGB to linear conversion. Adds [code]hint_normal[/code] as hint to the uniform declaration, which internally converts the texture for proper usage as normal map.