golangでDirectX11呼び出す

package main

import (
    "log"
    "syscall"
    "unsafe"
)

type IUnknown struct {
    v *IUnknownVTable
}

type IUnknownVTable struct {
    QueryInterface uintptr
    AddRef         uintptr
    Release        uintptr
}

type ID3D11Device struct {
    v *ID3D11DeviceVTable
}

type ID3D11DeviceVTable struct {
    IUnknownVTable
    CreateBuffer uintptr
    CreateTexture1D uintptr
    CreateTexture2D uintptr
    CreateTexture3D uintptr
    CreateShaderResourceView uintptr
    CreateUnorderedAccessView uintptr
    CreateRenderTargetView uintptr
    CreateDepthStencilView uintptr
    CreateInputLayout uintptr
    CreateVertexShader uintptr
    CreateGeometryShader uintptr
    CreateGeometryShaderWithStreamOutput uintptr
    CreatePixelShader uintptr
    CreateHullShader uintptr
    CreateDomainShader uintptr
    CreateComputeShader uintptr
    CreateClassLinkage uintptr
    CreateBlendState uintptr
    CreateDepthStencilState uintptr
    CreateRasterizerState uintptr
    CreateSamplerState uintptr
    CreateQuery uintptr
    CreatePredicate uintptr
    CreateCounter uintptr
    CreateDeferredContext uintptr
    OpenSharedResource uintptr
    CheckFormatSupport uintptr
    CheckMultisampleQualityLevels uintptr
    CheckCounterInfo uintptr
    CheckCounter uintptr
    CheckFeatureSupport uintptr
    GetPrivateData uintptr
    SetPrivateData uintptr
    SetPrivateDataInterface uintptr
    GetFeatureLevel uintptr
    GetCreationFlags uintptr
    GetDeviceRemovedReason uintptr
    GetImmediateContext uintptr
    SetExceptionMode uintptr
    GetExceptionMode uintptr
}

func main() {
    d3d11, err := syscall.LoadLibrary("d3d11.dll")
    if err != nil {
        log.Fatal(err)
    }

    d3D11CreateDevice, err := syscall.GetProcAddress(d3d11, "D3D11CreateDevice")
    if err != nil {
        log.Fatal(err)
    }

    createDeviceFlags := 2
    driverTypes := []int{
        1,
        2,
        3,
    }
    featureLevels := [1]int {
        45056,
    }

    var featureLevel int
    var device  *ID3D11Device
    var context  uintptr

    var nargs uintptr = 10
    ret, _, err := syscall.Syscall12(uintptr(d3D11CreateDevice),
    	nargs,
    	0,
    	uintptr(driverTypes[0]),
    	0,
    	uintptr(createDeviceFlags),
    	uintptr(unsafe.Pointer(&featureLevels)),
    	1,
    	7,
    	uintptr(unsafe.Pointer(&device)),
    	uintptr(unsafe.Pointer(&featureLevel)),
    	uintptr(unsafe.Pointer(&context)),
        0,
        0)

    log.Printf("%v\n", err)
    log.Printf("%v\n", ret)
    log.Printf("%v\n", featureLevel)
    log.Printf("%v\n", device)
    log.Printf("%v\n", context)

    ret, _, err = syscall.Syscall(uintptr(device.v.GetCreationFlags), 1, uintptr(unsafe.Pointer(device)), 0, 0)

    log.Printf("%v\n", err)
    log.Printf("%v\n", ret)
}