vo_opengl: simplify radius initialization

Somehow, the default radius for filters with variable radius was set in
mp_init_filter(). gl_video.c used NAN as default value for the radius,
which would make the filter use the default radius. Simplify this, and
set the default radius directly in the gl_video options. It also makes
the options easier to understand, because the default value listed in
--vo=opengl:help actually shows the default value.

Remove the function can_use_filter_kernel(), because it doesn't set a
radius if none is set. The function is worthless anyway (something about
making filter_kernels.c reusable to other VOs, and trying to deal with
the possibility that it could provide filters not supported by
vo_opengl.)

1 files changed, 1 insertions, 2 deletions

diff --git a/video/out/filter_kernels.c b/video/out/filter_kernels.c
index 8c889e1023..77dbea57c0 100644
--- a/video/out/filter_kernels.c
+++ b/video/out/filter_kernels.c
@@ -56,8 +56,7 @@ const struct filter_kernel *mp_find_filter_kernel(const char *name)
 bool mp_init_filter(struct filter_kernel *filter, const int *sizes,
                     double inv_scale)
 {
-    if (filter->radius < 0)
-        filter->radius = 3.0;
+    assert(filter->radius > 0);
     // polar filters are dependent only on the radius
     if (filter->polar) {
         filter->size = 1;