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pbr_functions.wgsl

Import path

Structures

SampleBias

#

Biasing info needed to sample from a texture. How this is done depends on whether we’re rendering meshlets or regular meshes.

struct SampleBias {
ddx_uv: vec2<f32> , šŸŸ¢ MESHLET_MESH_MATERIAL_PASS
ddy_uv: vec2<f32> , šŸŸ¢ MESHLET_MESH_MATERIAL_PASS
mip_bias: f32 , šŸ”“ MESHLET_MESH_MATERIAL_PASS
}

Functions

visibility_range_dither

#

Shader defs requirments:

šŸŸ¢ VISIBILITY_RANGE_DITHER

fn visibility_range_dither (
frag_coord: vec4<f32>
, 
dither: i32
)

alpha_discard

#
fn alpha_discard (
material: pbr_types
, 
output_color: vec4<f32>
) -> vec4<f32>

prepare_world_normal

#
fn prepare_world_normal (
world_normal: vec3<f32>
, 
double_sided: bool
, 
is_front: bool
) -> vec3<f32>

calculate_tbn_mikktspace

#
fn calculate_tbn_mikktspace (
world_normal: vec3<f32>
, 
world_tangent: vec4<f32>
) -> mat3x3<f32>

apply_normal_mapping

#
fn apply_normal_mapping (
standard_material_flags: u32
, 
TBN: mat3x3<f32>
, 
double_sided: bool
, 
is_front: bool
, 
in_Nt: vec3<f32>
) -> vec3<f32>

bend_normal_for_anisotropy

#

Shader defs requirments:

šŸŸ¢ STANDARD_MATERIAL_ANISOTROPY

This follows the suggested implementation in the KHR_materials_anisotropy specification: https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Khronos/KHR_materials_anisotropy/README.md#image-based-lighting

fn bend_normal_for_anisotropy (
lighting_input: ptr<function,lighting
)

calculate_view

#

NOTE: Correctly calculates the view vector depending on whether the projection is orthographic or perspective.

fn calculate_view (
world_position: vec4<f32>
, 
is_orthographic: bool
) -> vec3<f32>

calculate_diffuse_color

#

Diffuse strength is inversely related to metallicity, specular and diffuse transmission

fn calculate_diffuse_color (
base_color: vec3<f32>
, 
metallic: f32
, 
specular_transmission: f32
, 
diffuse_transmission: f32
) -> vec3<f32>

calculate_F0

#

Remapping [0,1] reflectance to F0 See https://google.github.io/filament/Filament.html#materialsystem/parameterization/remapping

fn calculate_F0 (
base_color: vec3<f32>
, 
metallic: f32
, 
reflectance: vec3<f32>
) -> vec3<f32>

apply_pbr_lighting

#
fn apply_pbr_lighting (
in: pbr_types
) -> vec4<f32>

apply_fog

#

Shader defs requirments:

šŸŸ¢ DISTANCE_FOG

fn apply_fog (
fog_params: mesh_view_types
, 
input_color: vec4<f32>
, 
fragment_world_position: vec3<f32>
, 
view_world_position: vec3<f32>
) -> vec4<f32>

premultiply_alpha

#

Shader defs requirments:

šŸŸ¢ PREMULTIPLY_ALPHA

fn premultiply_alpha (
standard_material_flags: u32
, 
color: vec4<f32>
) -> vec4<f32>

main_pass_post_lighting_processing

#

fog, alpha premultiply for non-hdr cameras, tonemapping and debanding

fn main_pass_post_lighting_processing (
pbr_input: pbr_types
, 
input_color: vec4<f32>
) -> vec4<f32>