Auto merge of #26630 - kunalmohan:gpu-sampler, r=jdm

Add GPUSampler to WebGPU implementation

Add dom_struct and webidl for GPUSampler, implement GPUDevice.createSampler() method.

<!-- Please describe your changes on the following line: -->
r?@kvark

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [ ] These changes fix #___ (GitHub issue number if applicable)

<!-- Either: -->
- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because ___

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

components/script/dom/webidls/GPUDevice.webidl

@@ -14,7 +14,7 @@ interface GPUDevice : EventTarget {
     GPUBuffer createBuffer(GPUBufferDescriptor descriptor);
     GPUMappedBuffer createBufferMapped(GPUBufferDescriptor descriptor);
     // GPUTexture createTexture(GPUTextureDescriptor descriptor);
-    // GPUSampler createSampler(optional GPUSamplerDescriptor descriptor = {});
+    GPUSampler createSampler(optional GPUSamplerDescriptor descriptor = {});
 
     GPUBindGroupLayout createBindGroupLayout(GPUBindGroupLayoutDescriptor descriptor);
     GPUPipelineLayout createPipelineLayout(GPUPipelineLayoutDescriptor descriptor);

components/script/dom/webidls/GPUSampler.webidl

@@ -0,0 +1,43 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+// https://gpuweb.github.io/gpuweb/#gpusampler
+[Exposed=(Window, DedicatedWorker), Pref="dom.webgpu.enabled"]
+interface GPUSampler {
+};
+GPUSampler includes GPUObjectBase;
+
+dictionary GPUSamplerDescriptor : GPUObjectDescriptorBase {
+    GPUAddressMode addressModeU = "clamp-to-edge";
+    GPUAddressMode addressModeV = "clamp-to-edge";
+    GPUAddressMode addressModeW = "clamp-to-edge";
+    GPUFilterMode magFilter = "nearest";
+    GPUFilterMode minFilter = "nearest";
+    GPUFilterMode mipmapFilter = "nearest";
+    float lodMinClamp = 0;
+    float lodMaxClamp = 0xfffff; // TODO: Update this. Value in spec was too big
+    GPUCompareFunction compare;
+};
+
+enum GPUAddressMode {
+    "clamp-to-edge",
+    "repeat",
+    "mirror-repeat"
+};
+
+enum GPUFilterMode {
+    "nearest",
+    "linear"
+};
+
+enum GPUCompareFunction {
+    "never",
+    "less",
+    "equal",
+    "less-equal",
+    "greater",
+    "not-equal",
+    "greater-equal",
+    "always"
+};