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| author | Brian <brian.paul@tungstengraphics.com> | 2007-09-18 12:50:20 -0600 |
|---|---|---|
| committer | Brian <brian.paul@tungstengraphics.com> | 2007-09-18 12:56:22 -0600 |
| commit | 72b0a57cfa99e55ad6e1b4ddcd486c202ee1f22d (patch) | |
| tree | 36948381056de902126b17ea6c5e892bd794d7ce | |
| parent | ccd63b54cfbb6bb241d55f7ac95afcd14819f469 (diff) | |
additional comments for tri_persp_coeff()
| -rw-r--r-- | src/mesa/pipe/softpipe/sp_prim_setup.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/mesa/pipe/softpipe/sp_prim_setup.c b/src/mesa/pipe/softpipe/sp_prim_setup.c index c64a4e9708..d0baf0734b 100644 --- a/src/mesa/pipe/softpipe/sp_prim_setup.c +++ b/src/mesa/pipe/softpipe/sp_prim_setup.c @@ -428,6 +428,10 @@ static void tri_linear_coeff( struct setup_stage *setup, /** * Compute a0, dadx and dady for a perspective-corrected interpolant, * for a triangle. + * We basically multiply the vertex value by 1/w before computing + * the plane coefficients (a0, dadx, dady). + * Later, when we compute the value at a particular fragment position we'll + * divide the interpolated value by the interpolated W at that fragment. */ static void tri_persp_coeff( struct setup_stage *setup, unsigned slot, |