Question

HRESULT D3D11CreateDeviceAndSwapChain(
  _In_   IDXGIAdapter *pAdapter,
  _In_   D3D_DRIVER_TYPE DriverType,
  _In_   HMODULE Software,                  //<-- This parameter
  _In_   UINT Flags,
  _In_   const D3D_FEATURE_LEVEL *pFeatureLevels,
  _In_   UINT FeatureLevels,
  _In_   UINT SDKVersion,
  _In_   const DXGI_SWAP_CHAIN_DESC *pSwapChainDesc,
  _Out_  IDXGISwapChain **ppSwapChain,
  _Out_  ID3D11Device **ppDevice,
  _Out_  D3D_FEATURE_LEVEL *pFeatureLevel,
  _Out_  ID3D11DeviceContext **ppImmediateContext
);

有人知道如何使用此参数的示例，以WARP为例。

Answer 1

要执行此类任务，您需要编写或使用自定义软件光栅化器，这意味着您需要实现整个D3D驱动程序实现并模拟物理设备。然后D3D将所有API调用转发到此模块以供执行。代码看起来非常类似于以下内容：

static const D3D_FEATURE_LEVEL levels[] = {
    D3D_FEATURE_LEVEL_11_1,
    D3D_FEATURE_LEVEL_11_0,  
    D3D_FEATURE_LEVEL_10_1,
    D3D_FEATURE_LEVEL_10_0,
    D3D_FEATURE_LEVEL_9_3,
    D3D_FEATURE_LEVEL_9_2,
    D3D_FEATURE_LEVEL_9_1
};

uint32_t flags = D3D11_CREATE_DEVICE_BGRA_SUPPORT; 

#ifdef _DEBUG
flags |= D3D11_CREATE_DEVICE_DEBUG;
#endif

Microsoft::WRL::ComPtr<ID3D11Device> device = nullptr;
Microsoft::WRL::ComPtr<ID3D11DeviceContext> deviceContext = nullptr;
Microsoft::WRL::ComPtr<IDXGISwapChain> swapChain = nullptr;
D3D_FEATURE_LEVEL selectedFeatureLevel;

DXGI_SWAP_CHAIN_DESC swap_chain_props { };
swap_chain_props.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
swap_chain_props.SwapEffect = DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL;
swap_chain_props.SampleDesc.Count = 1;
swap_chain_props.BufferCount = 2;

HMODULE custom_raterizer = ::LoadLibrary(L"X:\\FolderName\\CustomRasterizer.dll");

HRESULT hr = D3D11CreateDeviceAndSwapChain(nullptr, 
                                           D3D_DRIVER_TYPE_SOFTWARE, 
                                           custom_raterizer, 
                                           flags, 
                                           levels, 
                                           ARRAYSIZE(levels), 
                                           D3D11_SDK_VERSION, 
                                           &swap_chain_props,
                                           swapChain.GetAddressOf(),
                                           device.GetAddressOf(), 
                                           &selectedFeatureLevel, 
                                           deviceContext.GetAddressOf());

但是，这将是一项非常大的工作。 WARP对软件光栅化器执行得非常好，允许您为驱动程序类型传递D3D_DRIVER_TYPE_WARP，为模块句柄传递nullptr。在here部分中查看Removing the Need for Custom Software Rasterizers。

另一方面，在您看来，我希望WARP驱动程序是开源的。我很乐意使用上面的代码来玩它！

希望这有帮助。

编辑：

我偶然发现this link似乎有一个开源3D软件光栅化器。请记住，它必须与目标功能级别（D3D版本）完全兼容且稳定。

D3D11CreateDeviceAndSwapChain软件参数

1 个答案: