fix gamma calculation

mateusfavarin · mateusfavarin · commit 79c529581f4a · 2025-09-23T14:36:25.000-07:00
diff --git a/rewrite/src/exe/coll.c b/rewrite/src/exe/coll.c
@@ -94,7 +94,7 @@ static s32 _COLL_BarycentricTest(TestVertex* t, const CollVertex* v1, const Coll
         if (deltaTri[0].y == 0) { return BARYCENTRIC_TEST_INVALID; }
         beta = FP_DIV(deltaT.y, deltaTri[0].y);
         if (deltaTri[1].x == 0) { return BARYCENTRIC_TEST_INVALID; }
-        gamma = (deltaT.y * FP_ONE) - (beta * deltaTri[1].y);
+        gamma = ((deltaT.y * FP_ONE) - (beta * deltaTri[1].y)) / deltaTri[1].x;
     }
     if (beta == FP(-1) || gamma == FP(-1)) { return BARYCENTRIC_TEST_INVALID; }
 

Original file line number	Diff line number	Diff line change
`@@ -94,7 +94,7 @@ static s32 _COLL_BarycentricTest(TestVertex* t, const CollVertex* v1, const Coll`
`94`	`94`	`if (deltaTri[0].y == 0) { return BARYCENTRIC_TEST_INVALID; }`
`95`	`95`	`beta = FP_DIV(deltaT.y, deltaTri[0].y);`
`96`	`96`	`if (deltaTri[1].x == 0) { return BARYCENTRIC_TEST_INVALID; }`
`97`		`- gamma = (deltaT.y * FP_ONE) - (beta * deltaTri[1].y);`
	`97`	`+ gamma = ((deltaT.y * FP_ONE) - (beta * deltaTri[1].y)) / deltaTri[1].x;`
`98`	`98`	`}`
`99`	`99`	`if (beta == FP(-1) \|\| gamma == FP(-1)) { return BARYCENTRIC_TEST_INVALID; }`
`100`	`100`