feat: wasm compositor

Made-with: Cursor

1 files changed, 25 insertions, 0 deletions

diff --git a/rust/crates/compositor/src/shaders/mask.wgsl b/rust/crates/compositor/src/shaders/mask.wgsl
new file mode 100644
index 00000000..6bbfeccc
--- /dev/null
+++ b/rust/crates/compositor/src/shaders/mask.wgsl
@@ -0,0 +1,25 @@
+struct VertexOutput {
+    @builtin(position) position: vec4f,
+    @location(0) tex_coord: vec2f,
+}
+
+struct MaskUniforms {
+    inverted: f32,
+    _pad0: f32,
+    _pad1: f32,
+    _pad2: f32,
+}
+
+@group(0) @binding(0) var layer_texture: texture_2d<f32>;
+@group(0) @binding(1) var layer_sampler: sampler;
+@group(1) @binding(0) var mask_texture: texture_2d<f32>;
+@group(1) @binding(1) var mask_sampler: sampler;
+@group(2) @binding(0) var<uniform> uniforms: MaskUniforms;
+
+@fragment
+fn fragment_main(input: VertexOutput) -> @location(0) vec4f {
+    let layer = textureSample(layer_texture, layer_sampler, input.tex_coord);
+    let mask = textureSample(mask_texture, mask_sampler, input.tex_coord).a;
+    let alpha = select(mask, 1.0 - mask, uniforms.inverted > 0.5);
+    return vec4f(layer.rgb, layer.a * alpha);
+}