NAME

rendertarget_id - Assign a numeric identifier to a rendertarget

SYNOPSIS

id or nil
rendertarget_id( vid:rtgt )
rendertarget_id( vid:rtgt, int:id )

DESCRIPTION

This function is intended to be used for the rendering cases where a shader need to distinguish between the destination rendertarget, e.g. the case when stereoscopically rendering a side-by-side packed textured source without manually managing multiple pipelines. To do this, create two rendertargets, one via define_rendertarget and the other via define_linktarget . Give each a unique identifier with the help of this function, and then write your shader so that it does this distinction via the builtin int uniform rtgt_id. The two forms of this function is simply one that retrieves the current identifier, and another that updates. If the vid specified with rtgt does not exist, nil will be returned.

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