Interleaved gradient noise is now parameterized by frame count

I'm using an AAP (vrc.school/docs/Other/AAPs/) to create a frame
counter. That frame counter then drives this parameter. Thus the sparkly
pattern won't turn into gross flashing when the framerate is low.

Also add a speed parameter to control IGN.

1 files changed, 2 insertions, 2 deletions

diff --git a/atrix256.cginc b/atrix256.cginc
index 3eb164c..ccdc750 100644
--- a/atrix256.cginc
+++ b/atrix256.cginc
@@ -33,8 +33,8 @@ float ign(float2 screen_px) {
         0.00583715 * screen_px.y, 1), 1);
 }
 
-float ign_anim(float2 screen_px) {
-  float frame = frac(_Time[0]*.0005) * 64;
+float ign_anim(float2 screen_px, float frame, float speed) {
+  frame = fmod(frame * speed, 64);
   return ign(screen_px + frame * 5.588238f);
 }