From 93f1ab789d1cc641d4baab19ae3fd8b889af95e0 Mon Sep 17 00:00:00 2001 From: jpark37 Date: Wed, 14 Aug 2019 21:00:09 -0700 Subject: [PATCH] libobs: Fix dark lines using Lanczos When texel samples are not exactly on texel centers, weight calculations will involve a divide by a number very close to zero, resulting in precision issues. Restore normalization of weights to compensate. --- libobs/data/lanczos_scale.effect | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/libobs/data/lanczos_scale.effect b/libobs/data/lanczos_scale.effect index f1f054723..4d21543ec 100644 --- a/libobs/data/lanczos_scale.effect +++ b/libobs/data/lanczos_scale.effect @@ -111,6 +111,16 @@ float4 DrawLanczos(FragData f_in, bool undistort) float3 coltap024 = weight3(f_rev_half.y); float3 coltap135 = weight3(f_rev_half.y + 0.5); + // Need normalization if divided value near zero + float rowsum = rowtap024.x + rowtap024.y + rowtap024.z; + rowsum += rowtap135.x + rowtap135.y + rowtap135.z; + rowtap024 = rowtap024 / rowsum; + rowtap135 = rowtap135 / rowsum; + float colsum = coltap024.x + coltap024.y + coltap024.z; + colsum += coltap135.x + coltap135.y + coltap135.z; + coltap024 = coltap024 / colsum; + coltap135 = coltap135 / colsum; + float2 uv0 = (-2.5 - f) * stepxy + pos; float2 uv1 = uv0 + stepxy; float2 uv2 = uv1 + stepxy;