DirectX fatal error on almost every method on x86

Summary

Running the code with x86 PlatformTarget will fatal error:

using D3D11 = Silk.NET.Direct3D11;
using D3D9 = Silk.NET.Direct3D9;
using DXGI = Silk.NET.DXGI;

            var width = 1000;
            var height = 1000;

            var texture2DDesc = new D3D11.Texture2DDesc()
            {
                BindFlags = (uint) (D3D11.BindFlag.BindRenderTarget | D3D11.BindFlag.BindShaderResource),
                Format = DXGI.Format.FormatB8G8R8A8Unorm,
                Width = (uint) width,
                Height = (uint) height,
                MipLevels = 1,
                SampleDesc = new DXGI.SampleDesc(1, 0),
                Usage = D3D11.Usage.UsageDefault,
                MiscFlags = (uint) D3D11.ResourceMiscFlag.ResourceMiscShared,
                // The D3D11_RESOURCE_MISC_FLAG cannot be used when creating resources with D3D11_CPU_ACCESS flags.
                CPUAccessFlags = 0, //(uint) D3D11.CpuAccessFlag.None,
                ArraySize = 1
            };

            D3D11.ID3D11Device* pD3D11Device;
            D3D11.ID3D11DeviceContext* pD3D11DeviceContext;
            D3DFeatureLevel pD3DFeatureLevel = default;
            D3D11.D3D11 d3D11 = D3D11.D3D11.GetApi();

            var hr = d3D11.CreateDevice((DXGI.IDXGIAdapter*) IntPtr.Zero, D3DDriverType.D3DDriverTypeHardware,
                Software: 0,
                Flags: (uint) D3D11.CreateDeviceFlag.CreateDeviceBgraSupport,
                (D3DFeatureLevel*) IntPtr.Zero,
                FeatureLevels: 0, // D3DFeatureLevel 的长度
                SDKVersion: 7,
                (D3D11.ID3D11Device**) &pD3D11Device,
                ref pD3DFeatureLevel,
                (D3D11.ID3D11DeviceContext**) &pD3D11DeviceContext
            );

Steps to reproduce

• Platform: Desktop
• Framework Version: ALL
• API: DirectX
• API Version: All

Demo: https://github.com/lindexi/lindexi_gd/tree/cf6880ecd807f19d54da45566ac56bd23016ce18/RawluharkewalQeaninanel/RawluharkewalQeaninanel

Comments

The main reason is the Cdecl and Stdcall issues, such as the code:

((delegate* unmanaged[Cdecl]<ID3D11Device*, BufferDesc*, SubresourceData*, ID3D11Buffer**, int>)LpVtbl[3])(@this, pDesc, pInitialData, ppBufferPtr);

We should not use Cdecl key word, because the DirectX define is __stdcall.

#define STDMETHOD(method)        virtual COM_DECLSPEC_NOTHROW HRESULT STDMETHODCALLTYPE method
#define STDMETHOD_(type,method)  virtual COM_DECLSPEC_NOTHROW type STDMETHODCALLTYPE method
#define STDMETHODV(method)       virtual COM_DECLSPEC_NOTHROW HRESULT STDMETHODVCALLTYPE method
#define STDMETHODV_(type,method) virtual COM_DECLSPEC_NOTHROW type STDMETHODVCALLTYPE method

#define STDMETHODCALLTYPE       __stdcall

We must update all the DirectX method call with Stdcall

See https://github.com/dotnet/Silk.NET/pull/583 https://github.com/dotnet/Silk.NET/issues/663

[Perksey]

I’ll attempt to fix this, but note that D3D9 is one of two of our bindings that are explicitly unsupported on x86.

If the fix proves to difficult this’ll probably have to be community-championed or sponsored work using the GitHub Sponsors mechanism, as I fear it’s just going to be easier to drop x86 support.

Again, I’ll give it a shot, but don’t expect much. Not going to the moon and back for x86.

[lindexi]

Thank you @Perksey