On 29 December 2011 09:16, Paul Berry <stereotype...@gmail.com> wrote:
> Arguments in favor: (1) Because of transform feedback's intended use > and its position in the pipeline, the distinction between varyings and > other vertex shader outputs is irrelevant; in all likelihood the spec > writers intended for it to work on all vertex shader outputs. (2) The > very use of the term "varying" (and hence, this distinction) has > largely disappeared from the standard as of GLSL 1.30. (3) nVidia's > proprietary Linux driver supports transform feedback of all vertex > shader outputs (except gl_ClipVertex, which has many other bugs), so > it's conceivable that some code in the wild relies on this feature. > (4) Fixing transform feedback of gl_ClipVertex provides a nice > opportunity to prepare for the changes we will have to make to > transform feedback in order to support varying packing. > Whoops, that last "gl_ClipVertex" should be "gl_ClipDistance". Sorry if that caused any confusion.
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