diff options
| -rw-r--r-- | src/mesa/swrast/swrast.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/mesa/swrast/swrast.h b/src/mesa/swrast/swrast.h index 299eda5dc3e..90123e51324 100644 --- a/src/mesa/swrast/swrast.h +++ b/src/mesa/swrast/swrast.h @@ -61,8 +61,11 @@ * primitives unaccelerated), hook in swrast_setup instead. */ typedef struct { - /** win[0], win[1] are the screen-coords of SWvertex. win[2] is the - * z-coord. what is win[3]? */ + /** win[0], win[1] are the screen-coords of SWvertex. + * win[2] is the z-buffer coord (if 16-bit Z buffer, in range [0,65535]). + * win[3] is 1/w where w is the clip-space W coord. This is the value + * that clip{XYZ} were multiplied by to get ndc{XYZ}. + */ GLfloat win[4]; GLfloat texcoord[MAX_TEXTURE_COORD_UNITS][4]; GLchan color[4]; |