56 lines
No EOL
1.5 KiB
HLSL
56 lines
No EOL
1.5 KiB
HLSL
#include "map.hlsl"
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/*
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contributors: Inigo Quiles
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description: Calculate soft shadows http://iquilezles.org/www/articles/rmshadows/rmshadows.htm
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use: <float> raymarchSoftshadow( in <float3> ro, in <float3> rd )
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options:
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- RAYMARCHSOFTSHADOW_ITERATIONS: shadow quality
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- RAYMARCH_SHADOW_MIN_DIST: minimum shadow distance
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- RAYMARCH_SHADOW_MAX_DIST: maximum shadow distance
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- RAYMARCH_SHADOW_SOLID_ANGLE: light size
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examples:
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- /shaders/lighting_raymarching.frag
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*/
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#ifndef RAYMARCHSOFTSHADOW_ITERATIONS
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#define RAYMARCHSOFTSHADOW_ITERATIONS 64
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#endif
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#ifndef RAYMARCH_SHADOW_MIN_DIST
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#define RAYMARCH_SHADOW_MIN_DIST 0.005
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#endif
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#ifndef RAYMARCH_SHADOW_MAX_DIST
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#define RAYMARCH_SHADOW_MAX_DIST RAYMARCH_MAX_DIST
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#endif
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#ifndef RAYMARCH_SHADOW_SOLID_ANGLE
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#define RAYMARCH_SHADOW_SOLID_ANGLE 0.1
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#endif
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#ifndef FNC_RAYMARCH_SOFTSHADOW
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#define FNC_RAYMARCH_SOFTSHADOW
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float raymarchSoftShadow(float3 ro, float3 rd) {
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const float mint = RAYMARCH_SHADOW_MIN_DIST;
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const float maxt = RAYMARCH_SHADOW_MAX_DIST;
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const float w = RAYMARCH_SHADOW_SOLID_ANGLE;
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float res = 1.0;
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float t = mint;
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for (int i = 0; i < RAYMARCHSOFTSHADOW_ITERATIONS; i++) {
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if (t >= maxt)
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break;
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float h = RAYMARCH_MAP_FNC(ro + t * rd).sdf;
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res = min(res, h / (w * t));
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t += clamp(h, RAYMARCH_SHADOW_MIN_DIST, RAYMARCH_SHADOW_MAX_DIST);
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if (res < -1.0 || t > maxt)
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break;
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}
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res = max(res, -1.0);
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return 0.25 * (1.0 + res) * (1.0 + res) * (2.0 - res);
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}
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#endif |