clamp BiasMin, BiasMax to reasonable values

1 files changed, 8 insertions, 0 deletions

diff --git a/progs/demos/lodbias.c b/progs/demos/lodbias.c
index bee06da80b..a9b5312fd7 100644
--- a/progs/demos/lodbias.c
+++ b/progs/demos/lodbias.c
@@ -252,6 +252,14 @@ static void Init( void )
    printf("LOD bias range: [%g, %g]\n", -maxBias, maxBias);
    BiasMin = -100 * maxBias;
    BiasMax =  100 * maxBias;
+
+   /* Since we have (about) 8 mipmap levels, no need to bias beyond
+    * the range [-1, +8].
+    */
+   if (BiasMin < -100)
+      BiasMin = -100;
+   if (BiasMax > 800)
+      BiasMax = 800;
 }