Support immutable samplers

kvark · kvark · commit 25a6c42b8cc1 · 2019-07-04T13:21:12.000-04:00
diff --git a/spec/index.bs b/spec/index.bs
@@ -313,6 +313,10 @@ dictionary GPUBindGroupLayoutBinding {
     // are more efficient to bind at run-time.
     GPUTextureViewDimension textureDimension;
     bool multisample = false;
+    // For "sampler" binding type, if the actual sampler object is provided here,
+    // it becomes a part of the layout: an "immutable" sampler object, in a sense that
+    // no bind group binding call can affect it.
+    GPUSampler immutableSampler;
     // For uniform, storage and readonly storage buffer, means that the binding
     // has a dynamic offset. One offset must be passed to setBindGroup for each
     // dynamic binding in increasing order of `binding` number.
@@ -649,7 +653,7 @@ interface GPURenderPassEncoder : GPUProgrammablePassEncoder {
 
     void draw(u32 vertexCount, u32 instanceCount, u32 firstVertex, u32 firstInstance);
     void drawIndexed(u32 indexCount, u32 instanceCount, u32 firstIndex, i32 baseVertex, u32 firstInstance);
-    
+
     // Base instance must be set to zero inside the indirect buffer
     void drawIndirect(GPUBuffer indirectBuffer, u64 indirectOffset);
     void drawIndexedIndirect(GPUBuffer indirectBuffer, u64 indirectOffset);
