33 lines
962 B
HLSL
33 lines
962 B
HLSL
#include "../sampler.hlsl"
|
|
|
|
/*
|
|
contributors: Patricio Gonzalez Vivo
|
|
description: Given a Spherical Map texture and a normal direction returns the right pixel
|
|
use: spheremap(<SAMPLER_TYPE> texture, <float3> normal)
|
|
license:
|
|
- Copyright (c) 2021 Patricio Gonzalez Vivo under Prosperity License - https://prosperitylicense.com/versions/3.0.0
|
|
- Copyright (c) 2021 Patricio Gonzalez Vivo under Patron License - https://lygia.xyz/license
|
|
*/
|
|
|
|
#ifndef SPHEREMAP_TYPE
|
|
#define SPHEREMAP_TYPE float4
|
|
#endif
|
|
|
|
#ifndef SPHEREMAP_SAMPLER_FNC
|
|
#define SPHEREMAP_SAMPLER_FNC(TEX, UV) SAMPLER_FNC(TEX, UV)
|
|
#endif
|
|
|
|
#ifndef FNC_SPHEREMAP
|
|
#define FNC_SPHEREMAP
|
|
float2 sphereMap(float3 normal, float3 eye) {
|
|
float3 r = reflect(-eye, normal);
|
|
r.z += 1.;
|
|
float m = 2. * length(r);
|
|
return r.xy / m + 0.5;
|
|
}
|
|
|
|
|
|
SPHEREMAP_TYPE sphereMap (in SAMPLER_TYPE tex, in float3 normal, in float3 eye) {
|
|
return SPHEREMAP_SAMPLER_FNC(tex, sphereMap(normal, eye) );
|
|
}
|
|
#endif
|