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#pragma BLENDER_REQUIRE(common_view_lib.glsl)
#pragma BLENDER_REQUIRE(common_math_lib.glsl)
#pragma BLENDER_REQUIRE(eevee_closure_lib.glsl)
#pragma BLENDER_REQUIRE(gpu_shader_codegen_lib.glsl)
/* Globals used by closure. */
ClosureDiffuse g_diffuse_data;
ClosureReflection g_reflection_data;
ClosureRefraction g_refraction_data;
ClosureVolume g_volume_data;
ClosureEmission g_emission_data;
ClosureTransparency g_transparency_data;
struct GlobalData {
/** World position. */
vec3 P;
/** Surface Normal. */
vec3 N;
/** Geometric Normal. */
vec3 Ng;
/** Barycentric coordinates. */
vec2 barycentric_coords;
vec3 barycentric_dists;
/** Ray properties (approximation). */
int ray_type;
float ray_depth;
float ray_length;
/** Random number to sample a closure. */
float closure_rand;
float transmit_rand;
/** Hair time along hair length. 0 at base 1 at tip. */
float hair_time;
/** Hair time along width of the hair. */
float hair_time_width;
/** Hair thickness in world space. */
float hair_thickness;
/** Index of the strand for per strand effects. */
int hair_strand_id;
/** Is hair. */
bool is_strand;
};
GlobalData g_data;
void ntree_eval_init()
{
g_diffuse_data.color = vec3(0.0);
g_diffuse_data.N = vec3(1.0, 0.0, 0.0);
g_diffuse_data.sss_radius = vec3(0);
g_diffuse_data.sss_id = 0u;
g_reflection_data.color = vec3(0.0);
g_reflection_data.N = vec3(1.0, 0.0, 0.0);
g_reflection_data.roughness = 0.5;
g_refraction_data.color = vec3(0.0);
g_refraction_data.N = vec3(1.0, 0.0, 0.0);
g_refraction_data.roughness = 0.5;
g_volume_data.emission = vec3(0.0);
g_volume_data.scattering = vec3(0.0);
g_volume_data.transmittance = vec3(1.0);
g_volume_data.anisotropy = 0.0;
g_emission_data.emission = vec3(0.0);
g_transparency_data.transmittance = vec3(0.0);
g_transparency_data.holdout = 0.0;
}
void ntree_eval_weights()
{
float transmit_total = g_diffuse_data.color.r + g_refraction_data.color.r;
if (g_data.transmit_rand >= 0.0) {
float transmit_threshold = g_diffuse_data.color.r * safe_rcp(transmit_total);
if (g_data.transmit_rand > transmit_threshold) {
/* Signal that we will use the transmition closure. */
g_data.transmit_rand = 0.0;
}
else {
/* Signal that we will use the diffuse closure. */
g_data.transmit_rand = 1.0;
}
}
closure_weight_randomize(g_diffuse_data, g_data.closure_rand);
closure_weight_randomize(g_reflection_data, g_data.closure_rand);
closure_weight_randomize(g_refraction_data, g_data.closure_rand);
/* Amend total weight to avoid loosing energy. */
if (g_data.transmit_rand > 0.0) {
g_diffuse_data.color.r += g_refraction_data.color.r;
}
else if (g_data.transmit_rand == 0.0) {
g_refraction_data.color.r += g_diffuse_data.color.r;
}
}
/* Prototypes. */
void attrib_load();
vec3 nodetree_displacement();
Closure nodetree_surface();
Closure nodetree_volume();
float nodetree_thickness();
#ifdef EEVEE_MATERIAL_STUBS
# define attrib_load()
# define nodetree_displacement() vec3(0)
# define nodetree_surface() CLOSURE_DEFAULT
# define nodetree_volume() CLOSURE_DEFAULT
# define nodetree_thickness() 0.1
#endif
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