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crt-royale: Fix division by zero when border is 0.

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When border size is 0, a division by zero causes the border to
become infinitely large. Special-case this.
This commit is contained in:
BearOso 2023-01-29 18:40:20 -06:00
parent 4d97229d22
commit 316b234b09
1 changed files with 2 additions and 0 deletions
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2
crt/shaders/crt-royale/src/geometry-functions.h
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@ -679,6 +679,8 @@ float get_border_dim_factor(const float2 video_uv, const float2 geom_aspect)
const float2 border_penetration = const float2 border_penetration =
max(float2(border_size) - edge_dists, float2(0.0)); max(float2(border_size) - edge_dists, float2(0.0));
const float penetration_ratio = length(border_penetration)/border_size; const float penetration_ratio = length(border_penetration)/border_size;
if (border_size == 0.0)
penetration_ratio = 0.0;
const float border_escape_ratio = max(1.0 - penetration_ratio, 0.0); const float border_escape_ratio = max(1.0 - penetration_ratio, 0.0);
const float border_dim_factor = const float border_dim_factor =
pow(border_escape_ratio, border_darkness) * max(1.0, border_compress); pow(border_escape_ratio, border_darkness) * max(1.0, border_compress);