src/dawn/native/webgpu/CommandBufferWGPU.cpp

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

#include "dawn/native/webgpu/BufferWGPU.h"
#include "dawn/native/webgpu/DeviceWGPU.h"

namespace dawn::native::webgpu {

// static
Ref<CommandBuffer> CommandBuffer::Create(CommandEncoder* encoder,
                                         const CommandBufferDescriptor* descriptor) {
    return AcquireRef(new CommandBuffer(encoder, descriptor));
}

CommandBuffer::CommandBuffer(CommandEncoder* encoder, const CommandBufferDescriptor* descriptor)
    : CommandBufferBase(encoder, descriptor) {}

WGPUCommandBuffer CommandBuffer::Encode() {
    auto& wgpu = ToBackend(GetDevice())->wgpu;

    // TODO(crbug.com/413053623): Use stored command encoder descriptor
    WGPUCommandEncoder innerEncoder =
        wgpu.deviceCreateCommandEncoder(ToBackend(GetDevice())->GetInnerHandle(), nullptr);

    Command type;
    while (mCommands.NextCommandId(&type)) {
        switch (type) {
            case Command::CopyBufferToBuffer: {
                CopyBufferToBufferCmd* copy = mCommands.NextCommand<CopyBufferToBufferCmd>();
                wgpu.commandEncoderCopyBufferToBuffer(
                    innerEncoder, ToBackend(copy->source)->GetInnerHandle(), copy->sourceOffset,
                    ToBackend(copy->destination)->GetInnerHandle(), copy->destinationOffset,
                    copy->size);
                break;
            }
            default:
                DAWN_UNREACHABLE();
        }
    }

    // TODO(crbug.com/413053623): Store WGPUCommandBufferDescriptor and assign here.
    WGPUCommandBuffer result = wgpu.commandEncoderFinish(innerEncoder, nullptr);
    wgpu.commandEncoderRelease(innerEncoder);
    return result;
}

}  // namespace dawn::native::webgpu