mirror of
https://github.com/bevyengine/bevy
synced 2024-09-20 06:22:01 +00:00
9d1193df6c
Co-authored-by: JMS55 <47158642+JMS55@users.noreply.github.com> Co-authored-by: Robert Swain <robert.swain@gmail.com>
48 lines
1.6 KiB
WebGPU Shading Language
48 lines
1.6 KiB
WebGPU Shading Language
// This shader computes the chromatic aberration effect
|
||
|
||
#import bevy_pbr::utils
|
||
|
||
// Since post processing is a fullscreen effect, we use the fullscreen vertex shader provided by bevy.
|
||
// This will import a vertex shader that renders a single fullscreen triangle.
|
||
//
|
||
// A fullscreen triangle is a single triangle that covers the entire screen.
|
||
// The box in the top left in that diagram is the screen. The 4 x are the corner of the screen
|
||
//
|
||
// Y axis
|
||
// 1 | x-----x......
|
||
// 0 | | s | . ´
|
||
// -1 | x_____x´
|
||
// -2 | : .´
|
||
// -3 | :´
|
||
// +--------------- X axis
|
||
// -1 0 1 2 3
|
||
//
|
||
// As you can see, the triangle ends up bigger than the screen.
|
||
//
|
||
// You don't need to worry about this too much since bevy will compute the correct UVs for you.
|
||
#import bevy_core_pipeline::fullscreen_vertex_shader
|
||
|
||
@group(0) @binding(0)
|
||
var screen_texture: texture_2d<f32>;
|
||
@group(0) @binding(1)
|
||
var texture_sampler: sampler;
|
||
struct PostProcessSettings {
|
||
intensity: f32,
|
||
}
|
||
@group(0) @binding(2)
|
||
var<uniform> settings: PostProcessSettings;
|
||
|
||
@fragment
|
||
fn fragment(in: FullscreenVertexOutput) -> @location(0) vec4<f32> {
|
||
// Chromatic aberration strength
|
||
let offset_strength = settings.intensity;
|
||
|
||
// Sample each color channel with an arbitrary shift
|
||
return vec4<f32>(
|
||
textureSample(screen_texture, texture_sampler, in.uv + vec2<f32>(offset_strength, -offset_strength)).r,
|
||
textureSample(screen_texture, texture_sampler, in.uv + vec2<f32>(-offset_strength, 0.0)).g,
|
||
textureSample(screen_texture, texture_sampler, in.uv + vec2<f32>(0.0, offset_strength)).b,
|
||
1.0
|
||
);
|
||
}
|
||
|