45 lines
No EOL
1.7 KiB
HLSL
45 lines
No EOL
1.7 KiB
HLSL
#include "../sampler.hlsl"
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/*
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contributors: Patricio Gonzalez Vivo
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description: triplanar mapping
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use: <float4> sample2DCube(in <SAMPLER_TYPE> lut, in <float3> xyz)
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options:
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- SAMPLER_FNC(TEX, UV): optional depending the target version of GLSL (texture2D(...) or texture(...))
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- SAMPLETRIPLANAR_TYPE: optional depending the target version of GLSL (vec4 or float4)
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- SAMPLETRIPLANAR_FNC(TEX, UV): optional depending the target version of GLSL (texture2D(...) or texture(...))
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license:
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Prosperity License - https://prosperitylicense.com/versions/3.0.0
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Patron License - https://lygia.xyz/license
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*/
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#ifndef SAMPLETRIPLANAR_TYPE
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#define SAMPLETRIPLANAR_TYPE float4
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#endif
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#ifndef SAMPLETRIPLANAR_FNC
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#define SAMPLETRIPLANAR_FNC(TEX, UV) SAMPLER_FNC(TEX, UV)
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#endif
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#ifndef FNC_SAMPLETRIPLANAR
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#define FNC_SAMPLETRIPLANAR
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SAMPLETRIPLANAR_TYPE sampleTriplanar(SAMPLER_TYPE tex, in float3 d) {
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SAMPLETRIPLANAR_TYPE colx = SAMPLETRIPLANAR_FNC(tex, d.yz);
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SAMPLETRIPLANAR_TYPE coly = SAMPLETRIPLANAR_FNC(tex, d.zx);
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SAMPLETRIPLANAR_TYPE colz = SAMPLETRIPLANAR_FNC(tex, d.xy);
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float3 n = d*d;
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return (colx*n.x + coly*n.y + colz*n.z)/(n.x+n.y+n.z);
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}
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// iq's cubemap function
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SAMPLETRIPLANAR_TYPE sampleTriplanar(SAMPLER_TYPE tex, in float3 d, in float s) {
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SAMPLETRIPLANAR_TYPE colx = SAMPLETRIPLANAR_FNC(tex, 0.5 + s*d.yz/d.x);
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SAMPLETRIPLANAR_TYPE coly = SAMPLETRIPLANAR_FNC(tex, 0.5 + s*d.zx/d.y);
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SAMPLETRIPLANAR_TYPE colz = SAMPLETRIPLANAR_FNC(tex, 0.5 + s*d.xy/d.z);
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float3 n = d * d;
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return (colx*n.x + coly*n.y + colz*n.z)/(n.x+n.y+n.z);
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}
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#endif |