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//
// Fragment shader for camera lighting
//
// Author: Dan Gudmundsson
//
#include "lib_base.glsl"
// Moved to lib_base.glsl
// #ifdef GL_ARB_shader_texture_lod
// #extension GL_ARB_shader_texture_lod : enable
// #endif
uniform sampler2D EnvBrdfMap;
uniform sampler2D EnvDiffMap;
uniform sampler2D EnvSpecMap;
uniform float bg_rotate;
vec2 vec2uv(vec3 vec)
{
float u = atan(vec.x, vec.z);
float v = acos(vec.y);
u = 0.5f+0.5*u/M_PI;
v = v/M_PI;
// http://vcg.isti.cnr.it/~tarini/no-seams/
// float u1 = fract(u+0.5)-0.5;
// u = (fwidth(u)) < ((fwidth(u1)*2.1)) ? u : u1;
return vec2(u, v);
}
vec3 background_lighting(PBRInfo pbrInputs, vec3 N, vec3 reflection)
{
vec3 refl = normalize(reflection);
vec2 index = vec2uv(refl);
index = vec2(index.x+bg_rotate, index.y);
vec2 brdf = texture2D(EnvBrdfMap, vec2(pbrInputs.NdotV, pbrInputs.perceptualRoughness)).rg;
vec3 difflight = SRGBtoLINEAR(texture2D(EnvDiffMap, index)).rgb;
vec3 diffuse = difflight * pbrInputs.diffuseColor;
float mipCount = 10.0; // resolution of 2048x1024
float lod = (pbrInputs.perceptualRoughness * mipCount);
#ifdef GL_ARB_shader_texture_lod
vec3 speclight = SRGBtoLINEAR(texture2DLod(EnvSpecMap, index, lod)).rgb;
#else // NO GL_ARB_shader_texture_lod
vec3 speclight = SRGBtoLINEAR(texture2D(EnvSpecMap, index, lod)).rgb;
#endif // GL_ARB_shader_texture_lod
vec3 specular = speclight * (pbrInputs.specularColor * brdf.x + brdf.y);
return diffuse + specular;
}
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