1 files changed, 19 insertions, 0 deletions
diff --git a/dom/webgpu/tests/cts/checkout/src/webgpu/api/operation/render_pipeline/alpha_to_coverage.spec.ts b/dom/webgpu/tests/cts/checkout/src/webgpu/api/operation/render_pipeline/alpha_to_coverage.spec.ts
new file mode 100644
index 0000000000..0b234759ef
--- /dev/null
+++ b/dom/webgpu/tests/cts/checkout/src/webgpu/api/operation/render_pipeline/alpha_to_coverage.spec.ts
@@ -0,0 +1,19 @@
+export const description = `
+TODO:
+- for sampleCount = 4, alphaToCoverageEnabled = true and various combinations of:
+    - rasterization masks
+    - increasing alpha values of the first color output including { < 0, = 0, = 1/16, = 2/16, ..., = 15/16, = 1, > 1 }
+    - alpha values of the second color output = { 0, 0.5, 1.0 }.
+- test that for a single pixel in { first, second } { color, depth, stencil } output the final sample mask is applied to it, moreover:
+    - if alpha is 0.0 or less then alpha to coverage mask is 0x0,
+    - if alpha is 1.0 or greater then alpha to coverage mask is 0xFFFFFFFF,
+    - that the number of bits in the alpha to coverage mask is non-decreasing,
+    - that the computation of alpha to coverage mask doesn't depend on any other color output than first,
+    - (not included in the spec): that once a sample is included in the alpha to coverage sample mask
+      it will be included for any alpha greater than or equal to the current value.
+`;
+
+import { makeTestGroup } from '../../../../common/framework/test_group.js';
+import { GPUTest } from '../../../gpu_test.js';
+
+export const g = makeTestGroup(GPUTest);