filter_kernels: add radius cutoff functionality

This allows filter functions to be prematurely cut off once their
contributions start becoming insignificant. This effectively prevents
wasted GPU time sampling from parts of the function that are essentially
reduced to zero by the window function, providing anywhere from a 10% to
20% speedup. (5700μs -> 4700μs for me)

1 files changed, 1 insertions, 0 deletions

diff --git a/video/out/opengl/video.h b/video/out/opengl/video.h
index 6c41e70b1e..4a51d421ad 100644
--- a/video/out/opengl/video.h
+++ b/video/out/opengl/video.h
@@ -43,6 +43,7 @@ struct scaler_config {
     struct scaler_fun window;
     float radius;
     float antiring;
+    float cutoff;
     int clamp;
 };