v1.4.0

• Bindless resources. Unbounded resource arrays (Texture2D Tex[] : register(t0, space1); also samplers, structured, byte-address, constant buffers and read-write textures) and the Shader Model 6.6 heaps ResourceDescriptorHeap[i] / SamplerDescriptorHeap[i] compile on SPIR-V and Metal; before, unbounded arrays were error OSH0350. SPIR-V: runtime descriptor arrays with RuntimeDescriptorArray and SPV_EXT_descriptor_indexing, NonUniform decorations on the index, the access chain, the loaded descriptor and the data loaded through it, and DXC's default heap mapping (each resource type read from a heap is an unbounded array; the resource heap takes the first unused binding of set 0, the sampler heap the next; CompileOptions.ResourceHeapBinding/SamplerHeapBinding and the CLI's -fvk-bind-resource-heap/-fvk-bind-sampler-heap choose them). A heap element becomes a resource where it is assigned to a resource variable, cast, or passed to a function; misuse is OSH0336. Metal: each unbounded array or heap is one argument buffer of 8-byte descriptors (a texture's or sampler's gpuResourceID, a buffer's gpuAddress) at one buffer index, read through constant T_entry*; needs argument buffers tier 2 and Metal 3. WGSL: an error at the declaration or first use (OSH5202), only when WGSL is a selected target. Non-bindless output on every target is unchanged.
• Reflection: ResourceInfo.IsUnbounded (Count 0), Heap (DescriptorHeaps) and HeapKinds; EntryPointInfo.DescriptorHeaps; DeviceFeatures.RuntimeDescriptorArray, NonUniformIndexing and MutableDescriptorType (also in EntryLayout/PipelineLayout/PipelineLayoutInfo.RequiredFeatures). The serialized form gets optional heap/heapkinds attributes and a heaps child; the tool's JSON gets unbounded, heap, heapKinds, descriptorHeaps and requiredFeatures.
• OneShader.Layouts: ResourceLayout.IsUnbounded, Heap, HeapKinds. ToVulkan gives an unbounded binding a maximum descriptor count (VulkanLayoutOptions.UnboundedMaxCount, default 4096, per binding UnboundedCounts), PartiallyBound and, on the highest binding of a set, VariableDescriptorCount (options PartiallyBound, VariableDescriptorCount, UpdateAfterBind; DescriptorSetLayoutBindingInfo.BindingFlags, DescriptorSetLayoutInfo.CreateFlags), and a heap read as several kinds a Mutable descriptor with MutableTypes. DescriptorSetLayoutInfo.HasVariableCount tells which sets need the variable-count allocation info. TryToMetal reports MetalArgument.IsArgumentBuffer, DescriptorStride 8, ElementKinds, Encoding. TryToWebGpu returns a LayoutError.
• Generated bindings: Bindings.<Name>.IsUnbounded (and Heap for a heap), ResourceBinding.IsUnbounded; the generated Layout carries the heap data; variants work.
• The corpus gains bindless_textures, bindless_buffers and bindless_heap; the parity harness creates partially bound, update-after-bind, variable-count and mutable descriptor bindings, and the Metal runner executes argument-buffer cases.
• PipelineLayout.ToBindings describes unbounded arrays and heaps: BindingDescription.Count is 0 with IsUnbounded, Heap and HeapKinds for a descriptor heap, PartiallyBound (true for every unbounded binding) and HasVariableCount (the highest binding of its set). Union layouts merge equal unbounded slots and refuse an unbounded slot against a sized one.
• A scalar texel offset on a 2D or 3D texture (Sample(s, uv, 1)) applies to every axis, as in DXC; before, it produced invalid SPIR-V.