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additional comments for tri_persp_coeff()

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Brian 2007-09-18 12:50:20 -06:00
parent ccd63b54cf
commit 72b0a57cfa
1 changed files with 4 additions and 0 deletions
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4
src/mesa/pipe/softpipe/sp_prim_setup.c
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@ -428,6 +428,10 @@ static void tri_linear_coeff( struct setup_stage *setup,
/** /**
* Compute a0, dadx and dady for a perspective-corrected interpolant, * Compute a0, dadx and dady for a perspective-corrected interpolant,
* for a triangle. * 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, static void tri_persp_coeff( struct setup_stage *setup,
unsigned slot, unsigned slot,