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Stop copying the light probe array to the stack in the shader. (#11805)

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This was causing a severe performance regression when light probes were
enabled.

Fixes #11787.
This commit is contained in:
Patrick Walton 2024-02-10 07:47:29 -08:00 committed by GitHub
parent 2e2f89869b
commit b6945e5332
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GPG Key ID: B5690EEEBB952194
3 changed files with 17 additions and 14 deletions
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5
crates/bevy_pbr/src/light_probe/environment_map.wgsl
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@ -30,10 +30,7 @@ fn compute_radiances(
var radiances: EnvironmentMapRadiances;
// Search for a reflection probe that contains the fragment.
var query_result = query_light_probe(
light_probes.reflection_probes,
light_probes.reflection_probe_count,
world_position);
var query_result = query_light_probe(world_position, /*is_irradiance_volume=*/ false);
// If we didn't find a reflection probe, use the view environment map if applicable.
if (query_result.texture_index < 0) {

5
crates/bevy_pbr/src/light_probe/irradiance_volume.wgsl
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@ -13,10 +13,7 @@
// Slide 28, "Ambient Cube Basis"
fn irradiance_volume_light(world_position: vec3<f32>, N: vec3<f32>) -> vec3<f32> {
// Search for an irradiance volume that contains the fragment.
let query_result = query_light_probe(
light_probes.irradiance_volumes,
light_probes.irradiance_volume_count,
world_position);
let query_result = query_light_probe(world_position, /*is_irradiance_volume=*/ true);
// If there was no irradiance volume found, bail out.
if (query_result.texture_index < 0) {

21
crates/bevy_pbr/src/light_probe/light_probe.wgsl
View File

@ -1,5 +1,6 @@
#define_import_path bevy_pbr::light_probe
#import bevy_pbr::mesh_view_bindings::light_probes
#import bevy_pbr::mesh_view_types::LightProbe
// The result of searching for a light probe.
@ -28,20 +29,28 @@ fn transpose_affine_matrix(matrix: mat3x4<f32>) -> mat4x4<f32> {
//
// TODO: Interpolate between multiple light probes.
fn query_light_probe(
in_light_probes: array<LightProbe, 8u>,
light_probe_count: i32,
world_position: vec3<f32>,
is_irradiance_volume: bool,
) -> LightProbeQueryResult {
// This is needed to index into the array with a non-constant expression.
var light_probes = in_light_probes;
var result: LightProbeQueryResult;
result.texture_index = -1;
var light_probe_count: i32;
if is_irradiance_volume {
light_probe_count = light_probes.irradiance_volume_count;
} else {
light_probe_count = light_probes.reflection_probe_count;
}
for (var light_probe_index: i32 = 0;
light_probe_index < light_probe_count && result.texture_index < 0;
light_probe_index += 1) {
let light_probe = light_probes[light_probe_index];
var light_probe: LightProbe;
if is_irradiance_volume {
light_probe = light_probes.irradiance_volumes[light_probe_index];
} else {
light_probe = light_probes.reflection_probes[light_probe_index];
}
// Unpack the inverse transform.
let inverse_transform =