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Fix post_processing example on webgl2 (#9361)

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# Objective

The `post_processing` example is currently broken when run with webgl2.

```
cargo run --example post_processing --target=wasm32-unknown-unknown
```

```
wasm.js:387 panicked at 'wgpu error: Validation Error

Caused by:
    In Device::create_render_pipeline
      note: label = `post_process_pipeline`
    In the provided shader, the type given for group 0 binding 2 has a size of 4. As the device does not support `DownlevelFlags::BUFFER_BINDINGS_NOT_16_BYTE_ALIGNED`, the type must have a size that is a multiple of 16 bytes.
```

I bisected the breakage to c7eaedd6a1.

## Solution

Add padding when using webgl2
This commit is contained in:
Rob Parrett 2023-08-04 10:44:29 -07:00 committed by Carter Anderson
parent fefa8ea53b
commit 633f121502
2 changed files with 12 additions and 2 deletions
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4
assets/shaders/post_processing.wgsl
View file

@ -28,6 +28,10 @@ var screen_texture: texture_2d<f32>;
var texture_sampler: sampler;
struct PostProcessSettings {
intensity: f32,
#ifdef SIXTEEN_BYTE_ALIGNMENT
// WebGL2 structs must be 16 byte aligned.
_webgl2_padding: vec3<f32>
#endif
}
@group(0) @binding(2)
var<uniform> settings: PostProcessSettings;

10
examples/shader/post_processing.rs
View file

@ -283,7 +283,7 @@ impl FromWorld for PostProcessPipeline {
ty: BindingType::Buffer {
ty: bevy::render::render_resource::BufferBindingType::Uniform,
has_dynamic_offset: false,
min_binding_size: None,
min_binding_size: Some(PostProcessSettings::min_size()),
},
count: None,
},
@ -338,6 +338,9 @@ impl FromWorld for PostProcessPipeline {
#[derive(Component, Default, Clone, Copy, ExtractComponent, ShaderType)]
struct PostProcessSettings {
intensity: f32,
// WebGL2 structs must be 16 byte aligned.
#[cfg(feature = "webgl2")]
_webgl2_padding: Vec3,
}
/// Set up a simple 3D scene
@ -359,7 +362,10 @@ fn setup(
},
// Add the setting to the camera.
// This component is also used to determine on which camera to run the post processing effect.
PostProcessSettings { intensity: 0.02 },
PostProcessSettings {
intensity: 0.02,
..default()
},
));
// cube