src/dawn/native/webgpu/BindGroupLayoutWGPU.cpp

// Copyright 2025 The Dawn & Tint Authors
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#include "dawn/native/webgpu/BindGroupLayoutWGPU.h"

#include <vector>

#include "dawn/common/StringViewUtils.h"
#include "dawn/native/webgpu/CaptureContext.h"
#include "dawn/native/webgpu/ComputePipelineWGPU.h"
#include "dawn/native/webgpu/DeviceWGPU.h"
#include "dawn/native/webgpu/Forward.h"
#include "dawn/native/webgpu/RenderPipelineWGPU.h"

namespace dawn::native::webgpu {

// static
ResultOrError<Ref<BindGroupLayout>> BindGroupLayout::Create(
    Device* device,
    const UnpackedPtr<BindGroupLayoutDescriptor>& descriptor) {
    return AcquireRef(new BindGroupLayout(device, descriptor));
}

BindGroupLayout::BindGroupLayout(Device* device,
                                 const UnpackedPtr<BindGroupLayoutDescriptor>& descriptor)
    : BindGroupLayoutInternalBase(device, descriptor),
      RecordableObject(schema::ObjectType::BindGroupLayout),
      ObjectWGPU(device->wgpu.bindGroupLayoutRelease),
      mBindGroupAllocator(MakeFrontendBindGroupAllocator<BindGroup>(4096)) {
    // Rebuild the descriptor and resolve internal bindings to regular ones.
    std::vector<WGPUBindGroupLayoutEntry> entries(descriptor->entryCount);
    for (size_t i = 0; i < entries.size(); i++) {
        entries[i] = *ToAPI(&descriptor->entries[i]);

        switch (descriptor->entries[i].buffer.type) {
            case kInternalStorageBufferBinding:
                entries[i].buffer.type = WGPUBufferBindingType_Storage;
                break;
            case kInternalReadOnlyStorageBufferBinding:
                entries[i].buffer.type = WGPUBufferBindingType_ReadOnlyStorage;
                break;
            default:
                break;
        }
    }

    WGPUBindGroupLayoutDescriptor desc = {};
    desc.nextInChain = nullptr;
    desc.label = ToOutputStringView(descriptor->label);
    desc.entryCount = descriptor->entryCount;
    desc.entries = entries.data();

    mInnerHandle = device->wgpu.deviceCreateBindGroupLayout(device->GetInnerHandle(), &desc);
    DAWN_ASSERT(mInnerHandle);
}

Ref<BindGroup> BindGroupLayout::AllocateBindGroup(
    const UnpackedPtr<BindGroupDescriptor>& descriptor) {
    Device* device = ToBackend(GetDevice());
    return AcquireRef(mBindGroupAllocator->Allocate(device, descriptor));
}

void BindGroupLayout::DeallocateBindGroup(BindGroup* bindGroup) {
    mBindGroupAllocator->Deallocate(bindGroup);
}

void BindGroupLayout::ReduceMemoryUsage() {
    mBindGroupAllocator->DeleteEmptySlabs();
}

MaybeError BindGroupLayout::AddReferenced(CaptureContext& captureContext) {
    // BindGroupLayouts don't reference anything.
    return {};
}

MaybeError BindGroupLayout::CaptureCreationParameters(CaptureContext& context) {
    // TODO(451338754): Implement explicit BindGroupLayout capture
    return {};
}

}  // namespace dawn::native::webgpu