From 96851221ff805987a94917d5fcbf75819f5168ea Mon Sep 17 00:00:00 2001
From: Kai Ninomiya <kainino@chromium.org>
Date: Sun, 26 Apr 2026 01:33:55 -0700
Subject: [PATCH 1/2] Test that createBuffer/createTexture only allows exposed
 usages

For any buffer/texture usages known by the CTS, check that the browser
only accepts it if it also exposes it.

Currently the buffer test passes in all browsers - there haven't been any
new usages in a long time. But next time we add a usage, this makes sure
that when they start accepting the usage, they also start exposing it.

The texture test fails in Safari because it's missing validation of
unknown texture usages (this is also caught by another new test that
tests an invalid usage). Passes in Chrome/Firefox.

Unrelated cleanup: filter out redundant cases in createBuffer usage tests.
---
 .../api/validation/buffer/create.spec.ts      | 27 +++++++++++++++++
 .../api/validation/createTexture.spec.ts      | 29 +++++++++++++++++++
 2 files changed, 56 insertions(+)

diff --git a/src/webgpu/api/validation/buffer/create.spec.ts b/src/webgpu/api/validation/buffer/create.spec.ts
index b014626225f3..2342a440b835 100644
--- a/src/webgpu/api/validation/buffer/create.spec.ts
+++ b/src/webgpu/api/validation/buffer/create.spec.ts
@@ -61,6 +61,7 @@ g.test('usage')
     u
       .combine('usage1', [0, ...kBufferUsages, kInvalidUsage])
       .combine('usage2', [0, ...kBufferUsages, kInvalidUsage])
+      .filter(p => p.usage1 <= p.usage2)
       .beginSubcases()
       .combine('mappedAtCreation', [false, true])
   )
@@ -83,6 +84,32 @@ g.test('usage')
     );
   });
 
+g.test('new_usages')
+  .desc(`Valid sages not present in GPUBufferUsage shouldn't be accepted by createBuffer().`)
+  .params(u =>
+    u //
+      .beginSubcases()
+      .combine('usage', kBufferUsages)
+  )
+  .fn(t => {
+    const { usage } = t.params;
+
+    let exposedUsages = 0;
+    for (const v of Object.values(GPUBufferUsage)) {
+      exposedUsages |= v;
+    }
+
+    const success = (usage & exposedUsages) === usage;
+
+    t.expectGPUError(
+      'validation',
+      () => {
+        t.createBufferTracked({ size: 16, usage });
+      },
+      !success
+    );
+  });
+
 const BufferUsage = GPUConst.BufferUsage;
 
 g.test('createBuffer_invalid_and_oom')
diff --git a/src/webgpu/api/validation/createTexture.spec.ts b/src/webgpu/api/validation/createTexture.spec.ts
index a87580fa5051..f1e1e6ceb1e5 100644
--- a/src/webgpu/api/validation/createTexture.spec.ts
+++ b/src/webgpu/api/validation/createTexture.spec.ts
@@ -1098,6 +1098,35 @@ g.test('depthOrArrayLayers_and_mipLevelCount_for_transient_attachments')
     }, !success);
   });
 
+g.test('new_usages')
+  .desc(`Valid sages not present in GPUTextureUsage shouldn't be accepted by createTexture().`)
+  .params(u =>
+    u
+      .combine('usage', [
+        ...kTextureUsages,
+        GPUConst.TextureUsage.RENDER_ATTACHMENT | GPUConst.TextureUsage.TRANSIENT_ATTACHMENT,
+      ])
+      .filter(p => isValidTextureUsageCombination(p.usage))
+  )
+  .fn(t => {
+    const { usage } = t.params;
+
+    let exposedUsages = 0;
+    for (const v of Object.values(GPUTextureUsage)) {
+      exposedUsages |= v;
+    }
+
+    const success = (usage & exposedUsages) === usage;
+
+    t.expectGPUError(
+      'validation',
+      () => {
+        t.createTextureTracked({ format: 'rgba8unorm', size: [1, 1], usage });
+      },
+      !success
+    );
+  });
+
 g.test('viewFormats')
   .desc(
     `Test creating a texture with viewFormats list for all {texture format}x{view format}. Only compatible view formats should be valid.`

From f839c18029340a9c7425c7448593c2a6c22b6388 Mon Sep 17 00:00:00 2001
From: Kai Ninomiya <kainino1@gmail.com>
Date: Tue, 28 Apr 2026 13:17:41 +0200
Subject: [PATCH 2/2] Apply suggestions from code review
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Co-authored-by: François Beaufort <beaufort.francois@gmail.com>
---
 src/webgpu/api/validation/buffer/create.spec.ts | 2 +-
 src/webgpu/api/validation/createTexture.spec.ts | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/webgpu/api/validation/buffer/create.spec.ts b/src/webgpu/api/validation/buffer/create.spec.ts
index 2342a440b835..0ab531485fa2 100644
--- a/src/webgpu/api/validation/buffer/create.spec.ts
+++ b/src/webgpu/api/validation/buffer/create.spec.ts
@@ -85,7 +85,7 @@ g.test('usage')
   });
 
 g.test('new_usages')
-  .desc(`Valid sages not present in GPUBufferUsage shouldn't be accepted by createBuffer().`)
+  .desc(`Valid usages not present in GPUBufferUsage shouldn't be accepted by createBuffer().`)
   .params(u =>
     u //
       .beginSubcases()
diff --git a/src/webgpu/api/validation/createTexture.spec.ts b/src/webgpu/api/validation/createTexture.spec.ts
index f1e1e6ceb1e5..87a4fff10c44 100644
--- a/src/webgpu/api/validation/createTexture.spec.ts
+++ b/src/webgpu/api/validation/createTexture.spec.ts
@@ -1099,7 +1099,7 @@ g.test('depthOrArrayLayers_and_mipLevelCount_for_transient_attachments')
   });
 
 g.test('new_usages')
-  .desc(`Valid sages not present in GPUTextureUsage shouldn't be accepted by createTexture().`)
+  .desc(`Valid usages not present in GPUTextureUsage shouldn't be accepted by createTexture().`)
   .params(u =>
     u
       .combine('usage', [