Differential D10390 Diff 33913 source/blender/draw/engines/eevee/shaders/bsdf_common_lib.glsl

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source/blender/draw/engines/eevee/shaders/bsdf_common_lib.glsl


#pragma BLENDER_REQUIRE(common_math_lib.glsl)		#pragma BLENDER_REQUIRE(common_math_lib.glsl)

		vec3 diffuse_dominant_dir(vec3 N, vec3 vis_cone_dir, float vis_cone_aperture_cos)
		{
		/* TODO(fclem) revisit this. bent too much towards vis_cone_dir. */
		vis_cone_aperture_cos *= sqr(vis_cone_aperture_cos);

		N = mix(vis_cone_dir, N, vis_cone_aperture_cos);
		return normalize(N);
		}

vec3 specular_dominant_dir(vec3 N, vec3 V, float roughness)		vec3 specular_dominant_dir(vec3 N, vec3 V, float roughness)
{		{
vec3 R = -reflect(V, N);		vec3 R = -reflect(V, N);
float smoothness = 1.0 - roughness;		float smoothness = 1.0 - roughness;
float fac = smoothness * (sqrt(smoothness) + roughness);		float fac = smoothness * (sqrt(smoothness) + roughness);
return normalize(mix(N, R, fac));		return normalize(mix(N, R, fac));
}		}

▲ Show 20 Lines • Show All 62 Lines • ▼ Show 20 Lines	vec3 F_color_blend(float eta, float fresnel, vec3 f0_color)
return mix(f0_color, vec3(1.0), fac);		return mix(f0_color, vec3(1.0), fac);
}		}

/* Fresnel split-sum approximation. */		/* Fresnel split-sum approximation. */
vec3 F_brdf_single_scatter(vec3 f0, vec3 f90, vec2 lut)		vec3 F_brdf_single_scatter(vec3 f0, vec3 f90, vec2 lut)
{		{
/* Unreal specular matching : if specular color is below 2% intensity,		/* Unreal specular matching : if specular color is below 2% intensity,
* treat as shadowning */		* treat as shadowning */
return saturate(50.0 * dot(f0, vec3(0.3, 0.6, 0.1))) * lut.y * abs(f90) + lut.x * f0;		return lut.y * f90 + lut.x * f0;
}		}

/* Multi-scattering brdf approximation from :		/* Multi-scattering brdf approximation from :
* "A Multiple-Scattering Microfacet Model for Real-Time Image-based Lighting"		* "A Multiple-Scattering Microfacet Model for Real-Time Image-based Lighting"
* by Carmelo J. Fdez-Agüera. */		* by Carmelo J. Fdez-Agüera. */
vec3 F_brdf_multi_scatter(vec3 f0, vec3 f90, vec2 lut)		vec3 F_brdf_multi_scatter(vec3 f0, vec3 f90, vec2 lut)
{		{
vec3 FssEss = F_brdf_single_scatter(f0, f90, lut);		vec3 FssEss = lut.y * f90 + lut.x * f0;
/* Hack to avoid many more shader variations. */
if (f90.g < 0.0) {
return FssEss;
}

float Ess = lut.x + lut.y;		float Ess = lut.x + lut.y;
float Ems = 1.0 - Ess;		float Ems = 1.0 - Ess;
vec3 Favg = f0 + (1.0 - f0) / 21.0;		vec3 Favg = f0 + (1.0 - f0) / 21.0;
vec3 Fms = FssEss * Favg / (1.0 - (1.0 - Ess) * Favg);		vec3 Fms = FssEss * Favg / (1.0 - (1.0 - Ess) * Favg);
/* We don't do anything special for diffuse surfaces because the principle bsdf		/* We don't do anything special for diffuse surfaces because the principle bsdf
* does not care about energy conservation of the specular layer for dielectrics. */		* does not care about energy conservation of the specular layer for dielectrics. */
return FssEss + Fms * Ems;		return FssEss + Fms * Ems;
}		}

#define F_brdf(f0, f90, lut) F_brdf_multi_scatter(f0, f90, lut)

/* GGX */		/* GGX */
float D_ggx_opti(float NH, float a2)		float D_ggx_opti(float NH, float a2)
{		{
float tmp = (NH * a2 - NH) * NH + 1.0;		float tmp = (NH * a2 - NH) * NH + 1.0;
return M_PI * tmp * tmp; /* Doing RCP and mul a2 at the end */		return M_PI * tmp * tmp; /* Doing RCP and mul a2 at the end */
}		}

float G1_Smith_GGX(float NX, float a2)		float G1_Smith_GGX(float NX, float a2)
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