Don't always declare frag shader INPUT[0] as fragment position.

We were doing this for the sake of softpipe and the tgsi intergrepter since
we always need the fragment position and W-coordinate information in order
to compute fragment interpolants.
But that's not appropriate for hardware drivers.
The tgsi interpreter now get x,y,w information from a separate tgsi_exec_vector
variable setup by softpipe.
The new pipe_shader_state->input_map[] defines how vert shader outputs map
to frag shader inputs.  It may go away though, since one can also examine
the semantic label on frag shader input[0] to figure things out.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/mesa/pipe/softpipe/sp_headers.h b/src/mesa/pipe/softpipe/sp_headers.h
index b9f2b2205a8..0ae31d87961 100644
--- a/src/mesa/pipe/softpipe/sp_headers.h
+++ b/src/mesa/pipe/softpipe/sp_headers.h
@@ -73,6 +73,7 @@ struct quad_header {
    float coverage[QUAD_SIZE];    /** fragment coverage for antialiasing */
 
    const struct tgsi_interp_coef *coef;
+   const struct tgsi_interp_coef *posCoef;
 
    unsigned nr_attrs;
 };