diff options
Diffstat (limited to 'video/out/filter_kernels.c')
| -rw-r--r-- | video/out/filter_kernels.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/video/out/filter_kernels.c b/video/out/filter_kernels.c index 0f6d5a98bc..d39e5ba4c5 100644 --- a/video/out/filter_kernels.c +++ b/video/out/filter_kernels.c @@ -73,7 +73,6 @@ bool mp_init_filter(struct filter_kernel *filter, const int *sizes, filter->f.radius *= filter->inv_scale; // Polar filters are dependent solely on the radius if (filter->polar) { - filter->f.radius = fmin(filter->f.radius, 16.0); filter->size = 1; // Safety precaution to avoid generating a gigantic shader if (filter->f.radius > 16.0) { @@ -140,6 +139,12 @@ static void mp_compute_weights(struct filter_kernel *filter, // Fill the given array with weights for the range [0.0, 1.0]. The array is // interpreted as rectangular array of count * filter->size items. +// +// There will be slight sampling error if these weights are used in a OpenGL +// texture as LUT directly. The sampling point of a texel is located at its +// center, so out_array[0] will end up at 0.5 / count instead of 0.0. +// Correct lookup requires a linear coordinate mapping from [0.0, 1.0] to +// [0.5 / count, 1.0 - 0.5 / count]. void mp_compute_lut(struct filter_kernel *filter, int count, float *out_array) { struct filter_window *window = &filter->w; |