56 lines
2.1 KiB
PostScript
56 lines
2.1 KiB
PostScript
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/*
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Edge detection pass
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Author: LVutner (Discord: @lvutner)
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This is free and unencumbered software released into the public domain.
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Anyone is free to copy, modify, publish, use, compile, sell, or
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distribute this software, either in source code form or as a compiled
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binary, for any purpose, commercial or non-commercial, and by any
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means.
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In jurisdictions that recognize copyright laws, the author or authors
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of this software dedicate any and all copyright interest in the
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software to the public domain. We make this dedication for the benefit
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of the public at large and to the detriment of our heirs and
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successors. We intend this dedication to be an overt act of
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relinquishment in perpetuity of all present and future rights to this
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software under copyright law.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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For more information, please refer to <https://unlicense.org>
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*/
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#include "fluid_common_render.h"
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#define fs_edge_threshold 0.97 //Higher = more strict edge detection
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float main(float4 hpos : SV_Position) : SV_Target
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{
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//Dimensions
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float4 sc_res = float4(RTWidth, RTHeight, 1.0 / RTWidth, 1.0 / RTHeight);
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//Screen UV
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float2 texcoord = hpos.xy * sc_res.zw;
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//3x3 neighborhood
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float4 tap0 = rayDataTexSmall.GatherAlpha(samPointClamp, texcoord);
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float4 tap1 = rayDataTexSmall.GatherAlpha(samPointClamp, texcoord, int2(-1, -1));
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float4 tap2 = rayDataTexSmall.GatherAlpha(samPointClamp, texcoord, int2(-1, 1));
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float4 tap3 = rayDataTexSmall.GatherAlpha(samPointClamp, texcoord, int2(1, -1));
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float4 delta0 = abs(float4(tap1.xzw, tap2.w) - tap0.wwww);
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float4 delta1 = abs(float4(tap3.wx, tap0.xy) - tap0.wwww);
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//Get da edges
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return step(fs_edge_threshold, dot((delta0 + delta1), 0.5));
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}
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