From a9dbbfa1488a9ec3bd772fc9847888502f49a65e Mon Sep 17 00:00:00 2001 From: yum Date: Fri, 13 Jun 2025 17:59:00 -0700 Subject: Fix some filamented inconsistencies --- SharedFilteringLib.hlsl | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 SharedFilteringLib.hlsl (limited to 'SharedFilteringLib.hlsl') diff --git a/SharedFilteringLib.hlsl b/SharedFilteringLib.hlsl new file mode 100644 index 0000000..582adff --- /dev/null +++ b/SharedFilteringLib.hlsl @@ -0,0 +1,47 @@ +#ifndef SERVICE_FILTERING_INCLUDED +#define SERVICE_FILTERING_INCLUDED + +float4 cubic(float v) +{ + float4 n = float4(1.0, 2.0, 3.0, 4.0) - v; + float4 s = n * n * n; + float x = s.x; + float y = s.y - 4.0 * s.x; + float z = s.z - 4.0 * s.y + 6.0 * s.x; + float w = 6.0 - x - y - z; + return float4(x, y, z, w); +} + + +// Unity's SampleTexture2DBicubic doesn't exist in 2018, which is our target here. +// So this is a similar function with tweaks to have similar semantics. + +float4 SampleTexture2DBicubicFilter(TEXTURE2D_PARAM(tex, smp), float2 coord, float4 texSize) +{ + coord = coord * texSize.xy - 0.5; + float fx = frac(coord.x); + float fy = frac(coord.y); + coord.x -= fx; + coord.y -= fy; + + float4 xcubic = cubic(fx); + float4 ycubic = cubic(fy); + + float4 c = float4(coord.x - 0.5, coord.x + 1.5, coord.y - 0.5, coord.y + 1.5); + float4 s = float4(xcubic.x + xcubic.y, xcubic.z + xcubic.w, ycubic.x + ycubic.y, ycubic.z + ycubic.w); + float4 offset = c + float4(xcubic.y, xcubic.w, ycubic.y, ycubic.w) / s; + + float4 sample0 = SAMPLE_TEXTURE2D(tex, smp, float2(offset.x, offset.z) * texSize.zw); + float4 sample1 = SAMPLE_TEXTURE2D(tex, smp, float2(offset.y, offset.z) * texSize.zw); + float4 sample2 = SAMPLE_TEXTURE2D(tex, smp, float2(offset.x, offset.w) * texSize.zw); + float4 sample3 = SAMPLE_TEXTURE2D(tex, smp, float2(offset.y, offset.w) * texSize.zw); + + float sx = s.x / (s.x + s.y); + float sy = s.z / (s.z + s.w); + + return lerp( + lerp(sample3, sample2, sx), + lerp(sample1, sample0, sx), sy); +} + +#endif // SERVICE_FILTERING_INCLUDED \ No newline at end of file -- cgit v1.2.3