[Bug 83380] Linking fails when not writing gl_Position.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83380

--- Comment #5 from Tapani Pälli <lemody at gmail.com> ---
Huh I did not realize that desktop and ES specs treat this subject in a
slightly different way. What I can tell from GLSL ES spec is that it is not
mandatory to write gl_Position (?) At least by these paragraphs:

--- 8< ---
GLSL ES spec 1.0.17 says in 7.1 Vertex Shader Special Variables section:

"The value of gl_Position is undefined if a vertex shader is executed and does
not write gl_Position."

AND

10.13 gl_Position

"Is it an error if the vertex shader doesn't write to gl_Position? Whether a
shader writes to gl_Position cannot always be determined e.g. if there is
dependence on an attribute.

Option 1: No it is not an error. The behavior is undefined in this case.
Development systems should issue a warning in this case but the on-target
compiler should not have to detect this.

RESOLUTION: No error (option 1). The nature of the undefined behavior must be
specified."
--- 8< ---

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