ref: 459ef75c8b3e1081d3ef9264c533553a880a2431
parent: 837611268a2e7b1fe305623d6e7bce8c538adcc4
author: David <gek@katherine>
date: Sat Feb 13 18:31:18 EST 2021
Minor perf improvement
--- a/src/ztriangle.c
+++ b/src/ztriangle.c
@@ -23,7 +23,7 @@
#define XSTIP(_a) ((THE_X+_a)& TGL_POLYGON_STIPPLE_MASK_X)
#define YSTIP (the_y & TGL_POLYGON_STIPPLE_MASK_Y)
//NOTES Divide by 8 to get the byte Get the actual bit
-#define STIPBIT(_a) (zb->stipplepattern[(XSTIP(_a) + (YSTIP<<TGL_POLYGON_STIPPLE_POW2_WIDTH))>>3] & (1<<(XSTIP(_a) & 7)))
+#define STIPBIT(_a) (zb->stipplepattern[(XSTIP(_a) | (YSTIP<<TGL_POLYGON_STIPPLE_POW2_WIDTH))>>3] & (1<<(XSTIP(_a) & 7)))
#define STIPTEST(_a) !(zb->dostipple && !STIPBIT(_a))
#define ZCMP(z,zpix,_a) ((z) >= (zpix) && STIPTEST(_a))