#include <cfenv>
#include "kernel/types.h"
#include "kernel/closure/bsdf_util.h"
#include "kernel/util/colorspace.h"

Classes
struct	ChiangHairBSDF

Functions
ccl_device_inline float	delta_phi (const int p, const float gamma_o, const float gamma_t)
ccl_device_inline float	wrap_angle (const float a)
ccl_device_inline float	logistic (const float x, const float s)
ccl_device_inline float	logistic_cdf (const float x, const float s)
ccl_device_inline float	bessel_I0 (float x)
ccl_device_inline float	log_bessel_I0 (const float x)
ccl_device_inline float	trimmed_logistic (const float x, const float s)
ccl_device_inline float	sample_trimmed_logistic (const float u, const float s)
ccl_device_inline float	azimuthal_scattering (float phi, const int p, const float s, float gamma_o, const float gamma_t)
ccl_device_inline float	longitudinal_scattering (float sin_theta_i, const float cos_theta_i, const float sin_theta_o, const float cos_theta_o, const float v)
ccl_device_inline void	hair_attenuation (KernelGlobals kg, const float f, Spectrum T, ccl_private Spectrum Ap, ccl_private float Ap_energy)
ccl_device_inline void	hair_alpha_angles (const float sin_theta_o, const float cos_theta_o, const float alpha, ccl_private float *angles)
ccl_device Spectrum	bsdf_hair_chiang_eval (KernelGlobals kg, const ccl_private ShaderData sd, const ccl_private ShaderClosure sc, const float3 wo, ccl_private float *pdf)
ccl_device int	bsdf_hair_chiang_sample (KernelGlobals kg, const ccl_private ShaderClosure sc, ccl_private ShaderData sd, float3 rand, ccl_private Spectrum eval, ccl_private float3 wo, ccl_private float pdf, ccl_private float2 sampled_roughness)
ccl_device void	bsdf_hair_chiang_blur (ccl_private ShaderClosure *sc, const float roughness)
ccl_device Spectrum	bsdf_hair_chiang_albedo (const ccl_private ShaderData sd, const ccl_private ShaderClosure sc)

Function Documentation

◆ azimuthal_scattering()

ccl_device_inline float azimuthal_scattering	(	float	phi,
		const int	p,
		const float	s,
		float	gamma_o,
		const float	gamma_t )

Definition at line 127 of file bsdf_principled_hair_chiang.h.

References ccl_device_inline, delta_phi(), trimmed_logistic(), and wrap_angle().

Referenced by bsdf_hair_chiang_eval(), and bsdf_hair_chiang_sample().

◆ bessel_I0()

ccl_device_inline float bessel_I0 ( float x )

Definition at line 76 of file bsdf_principled_hair_chiang.h.

References ccl_device_inline, i, sqr, and x.

Referenced by log_bessel_I0(), and longitudinal_scattering().

◆ bsdf_hair_chiang_albedo()

ccl_device Spectrum bsdf_hair_chiang_albedo	(	const ccl_private ShaderData *	sd,
		const ccl_private ShaderClosure *	sc )

Definition at line 467 of file bsdf_principled_hair_chiang.h.

References bsdf_principled_hair_albedo_roughness_scale(), ccl_device, ccl_private, cos_from_sin(), dot(), exp, fresnel_dielectric_cos(), make_spectrum, safe_normalize(), and sqrt.

Referenced by bsdf_albedo().

◆ bsdf_hair_chiang_blur()

ccl_device void bsdf_hair_chiang_blur	(	ccl_private ShaderClosure *	sc,
		const float	roughness )

Definition at line 457 of file bsdf_principled_hair_chiang.h.

References ccl_device, ccl_private, fmaxf, and ChiangHairBSDF::v.

Referenced by bsdf_blur().

◆ bsdf_hair_chiang_eval()

ccl_device Spectrum bsdf_hair_chiang_eval	(	KernelGlobals	kg,
		const ccl_private ShaderData *	sd,
		const ccl_private ShaderClosure *	sc,
		const float3	wo,
		ccl_private float *	pdf )

Definition at line 256 of file bsdf_principled_hair_chiang.h.

References atan2f, azimuthal_scattering(), ccl_device, ccl_private, cos_from_sin(), cross, dot(), exp, F, fabsf, fresnel_dielectric_cos(), hair_alpha_angles(), hair_attenuation(), i, isfinite_safe(), kernel_assert, longitudinal_scattering(), M_1_2PI_F, safe_asinf(), safe_normalize(), sqr, sqrtf, T, to_local(), X, float3::x, Y, float3::y, Z, float3::z, and zero_spectrum.

Referenced by bsdf_eval().

◆ bsdf_hair_chiang_sample()

ccl_device int bsdf_hair_chiang_sample	(	KernelGlobals	kg,
		const ccl_private ShaderClosure *	sc,
		ccl_private ShaderData *	sd,
		float3	rand,
		ccl_private Spectrum *	eval,
		ccl_private float3 *	wo,
		ccl_private float *	pdf,
		ccl_private float2 *	sampled_roughness )

Definition at line 338 of file bsdf_principled_hair_chiang.h.

References atan2f, azimuthal_scattering(), ccl_device, ccl_private, cos_from_sin(), cosf, cross, delta_phi(), dot(), exp, expf, F, fabsf, fresnel_dielectric_cos(), hair_alpha_angles(), hair_attenuation(), i, isfinite_safe(), kernel_assert, LABEL_GLOSSY, LABEL_REFLECT, LABEL_TRANSMIT, logf, longitudinal_scattering(), M_1_2PI_F, M_2PI_F, make_float2, max, safe_asinf(), safe_normalize(), sample_trimmed_logistic(), sin_from_cos(), spherical_cos_to_direction(), sqr, sqrtf, T, to_global(), to_local(), v, X, float3::x, Y, float3::y, Z, float3::z, and zero_spectrum.

Referenced by bsdf_sample().

◆ delta_phi()

ccl_device_inline float delta_phi	(	const int	p,
		const float	gamma_o,
		const float	gamma_t )

Definition at line 46 of file bsdf_principled_hair_chiang.h.

References ccl_device_inline, and M_PI_F.

Referenced by azimuthal_scattering(), bsdf_hair_chiang_sample(), blender::nodes::node_geo_mesh_primitive_ico_sphere_cc::calculate_bounds_ico_sphere(), blender::geometry::calculate_bounds_radial_primitive(), and blender::geometry::calculate_sphere_vertex_data().

◆ hair_alpha_angles()

ccl_device_inline void hair_alpha_angles	(	const float	sin_theta_o,
		const float	cos_theta_o,
		const float	alpha,
		ccl_private float *	angles )

Definition at line 235 of file bsdf_principled_hair_chiang.h.

References ccl_device_inline, ccl_private, cos_from_sin(), fabsf, sinf, and sqr.

Referenced by bsdf_hair_chiang_eval(), and bsdf_hair_chiang_sample().

◆ hair_attenuation()

ccl_device_inline void hair_attenuation	(	KernelGlobals	kg,
		const float	f,
		Spectrum	T,
		ccl_private Spectrum *	Ap,
		ccl_private float *	Ap_energy )

Definition at line 199 of file bsdf_principled_hair_chiang.h.

References ccl_device_inline, ccl_private, col, make_spectrum, one_spectrum, safe_divide(), spectrum_to_gray(), sqr, and T.

Referenced by bsdf_hair_chiang_eval(), and bsdf_hair_chiang_sample().

◆ log_bessel_I0()

ccl_device_inline float log_bessel_I0 ( const float x )

Definition at line 97 of file bsdf_principled_hair_chiang.h.

References bessel_I0(), ccl_device_inline, logf, M_LN_2PI_F, and x.

Referenced by longitudinal_scattering().

◆ logistic()

ccl_device_inline float logistic	(	const float	x,
		const float	s )

Definition at line 58 of file bsdf_principled_hair_chiang.h.

References ccl_device_inline, expf, fabsf, sqr, v, and x.

Referenced by trimmed_logistic().

◆ logistic_cdf()

ccl_device_inline float logistic_cdf	(	const float	x,
		const float	s )

Definition at line 65 of file bsdf_principled_hair_chiang.h.

References ccl_device_inline, expf, and x.

Referenced by sample_trimmed_logistic(), and trimmed_logistic().

◆ longitudinal_scattering()

ccl_device_inline float longitudinal_scattering	(	float	sin_theta_i,
		const float	cos_theta_i,
		const float	sin_theta_o,
		const float	cos_theta_o,
		const float	v )