1 files changed, 81 insertions, 0 deletions
diff --git a/testing/web-platform/mozilla/tests/webgpu/webgpu/util/texture.js b/testing/web-platform/mozilla/tests/webgpu/webgpu/util/texture.js
new file mode 100644
index 0000000000..c2c980c975
--- /dev/null
+++ b/testing/web-platform/mozilla/tests/webgpu/webgpu/util/texture.js
@@ -0,0 +1,81 @@
+/**
+* AUTO-GENERATED - DO NOT EDIT. Source: https://github.com/gpuweb/cts
+**/import { assert } from '../../common/util/util.js';import { getTextureCopyLayout } from './texture/layout.js';
+
+import { reifyExtent3D } from './unions.js';
+
+/**
+ * Creates a mipmapped texture where each mipmap level's (`i`) content is
+ * from `texelViews[i]`.
+ */
+export function createTextureFromTexelViews(
+device,
+texelViews,
+desc)
+{
+  // All texel views must be the same format for mipmaps.
+  assert(texelViews.length > 0 && texelViews.every((e) => e.format === texelViews[0].format));
+  const format = texelViews[0].format;
+  const { width, height, depthOrArrayLayers } = reifyExtent3D(desc.size);
+
+  // Create the texture and then initialize each mipmap level separately.
+  const texture = device.createTexture({
+    ...desc,
+    format: texelViews[0].format,
+    usage: desc.usage | GPUTextureUsage.COPY_DST,
+    mipLevelCount: texelViews.length
+  });
+
+  // Copy the texel view into each mip level layer.
+  const commandEncoder = device.createCommandEncoder();
+  const stagingBuffers = [];
+  for (let mipLevel = 0; mipLevel < texelViews.length; mipLevel++) {
+    const {
+      bytesPerRow,
+      mipSize: [mipWidth, mipHeight, mipDepthOrArray]
+    } = getTextureCopyLayout(format, desc.dimension ?? '2d', [width, height, depthOrArrayLayers], {
+      mipLevel
+    });
+
+    // Create a staging buffer to upload the texture mip level contents.
+    const stagingBuffer = device.createBuffer({
+      mappedAtCreation: true,
+      size: bytesPerRow * mipHeight * mipDepthOrArray,
+      usage: GPUBufferUsage.COPY_SRC
+    });
+    stagingBuffers.push(stagingBuffer);
+
+    // Write the texels into the staging buffer.
+    texelViews[mipLevel].writeTextureData(new Uint8Array(stagingBuffer.getMappedRange()), {
+      bytesPerRow,
+      rowsPerImage: mipHeight,
+      subrectOrigin: [0, 0, 0],
+      subrectSize: [mipWidth, mipHeight, mipDepthOrArray]
+    });
+    stagingBuffer.unmap();
+
+    // Copy from the staging buffer into the texture.
+    commandEncoder.copyBufferToTexture(
+      { buffer: stagingBuffer, bytesPerRow },
+      { texture, mipLevel },
+      [mipWidth, mipHeight, mipDepthOrArray]
+    );
+  }
+  device.queue.submit([commandEncoder.finish()]);
+
+  // Cleanup the staging buffers.
+  stagingBuffers.forEach((value) => value.destroy());
+
+  return texture;
+}
+
+/**
+ * Creates a 1 mip level texture with the contents of a TexelView.
+ */
+export function createTextureFromTexelView(
+device,
+texelView,
+desc)
+{
+  return createTextureFromTexelViews(device, [texelView], desc);
+}
+\ No newline at end of file