47 lines
No EOL
1.1 KiB
HLSL
47 lines
No EOL
1.1 KiB
HLSL
#include "map.hlsl"
|
|
|
|
/*
|
|
contributors: Inigo Quiles
|
|
description: Calculate Ambient Occlusion. See calcAO in https://www.shadertoy.com/view/lsKcDD
|
|
use: <float> raymarchAO( in <float3> pos, in <float3> nor )
|
|
examples:
|
|
- /shaders/lighting_raymarching.frag
|
|
*/
|
|
|
|
#ifndef RAYMARCH_AO_SAMPLES
|
|
#define RAYMARCH_AO_SAMPLES 5
|
|
#endif
|
|
|
|
#ifndef RAYMARCH_AO_INTENSITY
|
|
#define RAYMARCH_AO_INTENSITY 1.0
|
|
#endif
|
|
|
|
#ifndef RAYMARCH_AO_MIN_DIST
|
|
#define RAYMARCH_AO_MIN_DIST 0.001
|
|
#endif
|
|
|
|
#ifndef RAYMARCH_AO_MAX_DIST
|
|
#define RAYMARCH_AO_MAX_DIST 0.2
|
|
#endif
|
|
|
|
#ifndef RAYMARCH_AO_FALLOFF
|
|
#define RAYMARCH_AO_FALLOFF 0.95
|
|
#endif
|
|
|
|
#ifndef FNC_RAYMARCH_AO
|
|
#define FNC_RAYMARCH_AO
|
|
|
|
float raymarchAO(in float3 pos, in float3 nor) {
|
|
float occ = 0.0;
|
|
float sca = 1.0;
|
|
const float samplesFactor = 1.0 / float(RAYMARCH_AO_SAMPLES-1);
|
|
for (int i = 0; i < RAYMARCH_AO_SAMPLES; i++) {
|
|
float h = RAYMARCH_AO_MIN_DIST + RAYMARCH_AO_MAX_DIST * float(i) * samplesFactor;
|
|
float d = RAYMARCH_MAP_FNC(pos + h * nor).sdf;
|
|
occ += (h - d) * sca;
|
|
sca *= RAYMARCH_AO_FALLOFF;
|
|
}
|
|
return saturate(1.0 - RAYMARCH_AO_INTENSITY * occ);
|
|
}
|
|
|
|
#endif |