http://www.jwz.org/xscreensaver/xscreensaver-5.09.tar.gz

[xscreensaver] / hacks / glx / sonar.c

diff --git a/hacks/glx/sonar.c b/hacks/glx/sonar.c
index 535b52fea5599ea0d014ada3804e7638a2b7a5d1..cdafdef5d0f4dd349047fcf7fae5a79c1993d257 100644 (file)
--- a/hacks/glx/sonar.c
+++ b/hacks/glx/sonar.c
@@ -236,6 +236,9 @@ draw_screen (ModeInfo *mi, Bool mesh_p, Bool sweep_p)
 
       r0 = i     / (GLfloat) r_steps;
       r1 = (i+1) / (GLfloat) r_steps;
+
+      if (r1 > 1) r1 = 1; /* avoid asin lossage */
+
       z0 = cos (curvature/2 * asin (r0)) / 2 - zoff;
       z1 = cos (curvature/2 * asin (r1)) / 2 - zoff;