87 lines
2.7 KiB
GLSL
87 lines
2.7 KiB
GLSL
|
|
/*
|
|
* Copyright (c) 2023 LAX1DUDE. All Rights Reserved.
|
|
*
|
|
* WITH THE EXCEPTION OF PATCH FILES, MINIFIED JAVASCRIPT, AND ALL FILES
|
|
* NORMALLY FOUND IN AN UNMODIFIED MINECRAFT RESOURCE PACK, YOU ARE NOT ALLOWED
|
|
* TO SHARE, DISTRIBUTE, OR REPURPOSE ANY FILE USED BY OR PRODUCED BY THE
|
|
* SOFTWARE IN THIS REPOSITORY WITHOUT PRIOR PERMISSION FROM THE PROJECT AUTHOR.
|
|
*
|
|
* NOT FOR COMMERCIAL OR MALICIOUS USE
|
|
*
|
|
* (please read the 'LICENSE' file this repo's root directory for more info)
|
|
*
|
|
*/
|
|
|
|
#ifdef LIB_INCLUDE_PBR_LIGHTING_FUNCTION
|
|
#ifndef _HAS_PBR_LIGHTING_FUNCTION
|
|
#define _HAS_PBR_LIGHTING_FUNCTION
|
|
|
|
#ifdef LIB_INCLUDE_PBR_LIGHTING_PREFETCH
|
|
#define PREFETCH_METALS(albedo, materialG1f, metalN3f, metalK3f)\
|
|
if(materialG1f >= 0.9 && materialG1f < 0.964) {\
|
|
metalK3f.xy = vec2(0.25, (materialG1f - 0.9) * 15.625);\
|
|
metalN3f = textureLod(u_metalsLUT, metalK3f.xy, 0.0).rgb;\
|
|
metalK3f.x += 0.5;\
|
|
metalK3f = textureLod(u_metalsLUT, metalK3f.xy, 0.0).rgb;\
|
|
}
|
|
#endif
|
|
|
|
#ifdef LIB_INCLUDE_PBR_LIGHTING_PREFETCH
|
|
vec3 eaglercraftLighting(in vec3 albedo, in vec3 radiance, in vec3 viewDir, in vec3 lightDir, in vec3 normalVec, in vec3 materials, in vec3 metalN, in vec3 metalK) {
|
|
#else
|
|
vec3 eaglercraftLighting(in vec3 albedo, in vec3 radiance, in vec3 viewDir, in vec3 lightDir, in vec3 normalVec, in vec3 materials) {
|
|
#endif
|
|
float roughness = 1.0 - materials.r * 0.85;
|
|
vec3 H = normalize(viewDir + lightDir);
|
|
vec3 NdotHVL = max(normalVec * mat3(H, viewDir, lightDir), vec3(0.0));
|
|
float NDF = roughness * roughness;
|
|
NDF *= NDF;
|
|
float denom = NdotHVL.x * NdotHVL.x * (NDF - 1.0) + 1.0;
|
|
NDF /= denom * denom * 3.141592;
|
|
float gs = roughness + 1.0;
|
|
gs *= gs * 0.125;
|
|
vec2 Ndot = NdotHVL.yz;
|
|
Ndot /= Ndot * (1.0 - gs) + gs;
|
|
NDF *= Ndot.x * Ndot.y;
|
|
float fresnel = pow(max(1.0 - NdotHVL.x, 0.0), 5.0);
|
|
vec3 kD = vec3(0.03);
|
|
vec3 F;
|
|
if(materials.g < 0.9) {
|
|
F = vec3(materials.g + (1.0 - materials.g) * fresnel);
|
|
kD = (1.0 - F) * albedo / 3.141592;
|
|
}else if(materials.g < 0.964) {
|
|
#ifdef LIB_INCLUDE_PBR_LIGHTING_PREFETCH
|
|
vec3 mN = metalN;
|
|
vec3 mK = metalK;
|
|
#else
|
|
vec2 lutUV = vec2(0.25, (materials.g - 0.9) * 15.625);
|
|
vec3 mN = textureLod(u_metalsLUT, lutUV, 0.0).rgb;
|
|
lutUV.x += 0.5;
|
|
vec3 mK = textureLod(u_metalsLUT, lutUV, 0.0).rgb * length(albedo);
|
|
#endif
|
|
fresnel = 1.0 - fresnel;
|
|
mK *= mK;
|
|
mK += mN * mN;
|
|
vec3 nv = mN * fresnel * 2.0;
|
|
fresnel *= fresnel;
|
|
vec3 num = mK - nv + fresnel;
|
|
vec3 den = mK + nv + fresnel;
|
|
vec3 r = num / den;
|
|
mK *= fresnel;
|
|
mK += 1.0;
|
|
num = mK - nv;
|
|
den = mK + nv;
|
|
r += num / den;
|
|
r = clamp(r * 0.5, vec3(0.0), vec3(1.0));
|
|
F = r * r;
|
|
}else {
|
|
F = albedo + (1.0 - albedo) * fresnel;
|
|
}
|
|
denom = 4.0 * NdotHVL.y * NdotHVL.z + 0.0001;
|
|
return (kD + (NDF * F / denom)) * radiance * NdotHVL.z;
|
|
}
|
|
|
|
#endif
|
|
#endif
|