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Add a fast codepath for fetching background with zero roughness

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This commit is contained in:
Marco Buono 2023-09-26 03:01:18 -03:00
parent 3dfe796b34
commit 1e4e4f7043
1 changed files with 15 additions and 1 deletions
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16
crates/bevy_pbr/src/render/pbr_lighting.wgsl
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@ -308,7 +308,13 @@ fn specular_transmissive_light(world_position: vec4<f32>, frag_coord: vec3<f32>,
let offset_position = (clip_exit_position.xy / clip_exit_position.w) * vec2<f32>(0.5, -0.5) + 0.5;
// Fetch background color
let background_color = fetch_transmissive_background(offset_position, frag_coord, view_z, perceptual_roughness);
var background_color: vec4<f32>;
if perceptual_roughness == 0.0 {
// If the material has zero roughness, we can use a faster approach without the blur
background_color = fetch_transmissive_background_non_rough(offset_position);
} else {
background_color = fetch_transmissive_background(offset_position, frag_coord, view_z, perceptual_roughness);
}
// Calculate final color by applying specular transmissive color to a mix of background color and transmitted specular environment light
return specular_transmissive_color * mix(transmitted_environment_light_specular, background_color.rgb, background_color.a);
@ -326,6 +332,14 @@ fn interleaved_gradient_noise(pixel_coordinates: vec2<f32>) -> f32 {
return fract(52.9829189 * fract(0.06711056 * xy.x + 0.00583715 * xy.y));
}
fn fetch_transmissive_background_non_rough(offset_position: vec2<f32>) -> vec4<f32> {
return textureSample(
view_bindings::view_transmission_texture,
view_bindings::view_transmission_sampler,
offset_position,
);
}
fn fetch_transmissive_background(offset_position: vec2<f32>, frag_coord: vec3<f32>, view_z: f32, perceptual_roughness: f32) -> vec4<f32> {
// Calculate view aspect ratio, used to scale offset so that it's proportionate
let aspect = view_bindings::view.viewport.z / view_bindings::view.viewport.w;