PSSetSamplers 不起作用（像素着色器单元需要一个采样器）

Question

我是 directx11 的新手，我想为我正在使用的着色器添加纹理。（到目前为止，我还没有在 directx11 中使用任何纹理）

但采样似乎不起作用（它始终是 float4(0,0,0,0)），我收到警告："D3D11 WARNING: ID3D11DeviceContext::DrawIndexed: The Pixel Shader unit expects a Sampler to be set at Slot 0, but none is bound."

我搜索过这个，但所有答案都说使用

_d3dContext->PSSetSamplers(0, 1, &_sampler);

但我已经这样做了。有谁知道哪里出了问题？

这是我的整个着色器：

Texture2D tex;
SamplerState TexSampler : register(S0)
{
    Texture = (Slope);
    Filter = MIN_MAG_MIP_LINEAR;
    AddressU = clamp;
    AddressV = clamp;
};

struct PixelShaderInput
{
    float4 color : COLOR0;
    //.r : slope
    //.g : relative distance on road (compared the the rider)
    //.b : shadow (currently darker on lower parts)
    //.a : cameradepth
    float fogfactor : COLOR1;
};

float4 main(PixelShaderInput input) : SV_TARGET
{
    const float4 fogColor = float4(0.9, 0.9, 1, 1);

    const float halfWidth = 0.0016f;

    float4 color;

    if (input.color.g < -halfWidth * input.color.a)
    {
        color = float4(0.5, 0.85, 1, 1);
    }
    else if (input.color.g < halfWidth * input.color.a)
    {
        color = float4(1, 1, 1, 1);
    }
    else
    {
        color = tex.Sample(TexSampler, float2(input.color.r, 0.5));
    }

    if (input.color.b < 0.999)
    {
        input.color.b *= 0.94; //makes the sides a bit darker
    }
    color.rgb *= input.color.b;

    color.rgb = lerp(color.rgb, fogColor.rgb, input.fogfactor);

    return color;
}

在 c++/cx 中我这样做（不是完整代码，只是片段）：

Microsoft::WRL::ComPtr<ID3D11ShaderResourceView>    _slopeGradient;
Microsoft::WRL::ComPtr<ID3D11SamplerState>          _sampler;

D3D11_SAMPLER_DESC sampDesc;
ZeroMemory(&sampDesc, sizeof(sampDesc));
sampDesc.Filter = D3D11_FILTER_MIN_MAG_MIP_LINEAR;
sampDesc.AddressU = D3D11_TEXTURE_ADDRESS_CLAMP;
sampDesc.AddressV = D3D11_TEXTURE_ADDRESS_CLAMP;
sampDesc.AddressW = D3D11_TEXTURE_ADDRESS_CLAMP;
sampDesc.ComparisonFunc = D3D11_COMPARISON_NEVER;
sampDesc.MinLOD = 0;
sampDesc.MaxLOD = D3D11_FLOAT32_MAX;
_d3dDevice->CreateSamplerState(&sampDesc, &_sampler);

_d3dContext->PSSetShaderResources(0, 1, &_slopeGradient);
_d3dContext->PSSetSamplers(0, 1, &_sampler);

Answer 1

问题是您对 ComPtr 的使用。 Microsoft::WRL::ComPtr 的 operator& 重载调用 ReleaseAndGetAddressOf，而不是 GetAddressOf。因此，您现在基本上就是在这样做，它总是将这些资源设置为 nullptr（即清除插槽）：

_d3dContext->PSSetShaderResources(0, 1, _slopeGradient.ReleaseAndGetAddressOf());
_d3dContext->PSSetSamplers(0, 1, _sampler.ReleaseAndGetAddressOf());

你应该使用：

_d3dContext->PSSetShaderResources(0, 1, _slopeGradient.GetAddressOf());
_d3dContext->PSSetSamplers(0, 1, _sampler.GetAddressOf());

The old ATL CComPtr had the operator& overload map toGetAddressOf but asserted that it was a nullptr which often resulted in inadvertent memory leaks. The operator& is assumed to be used in initialization by these smart-pointers, and that's not what you are doing here. You really want the address of the initialized raw pointer.

请记住，这两种方法实际上都采用 COM 指针数组。在 C 中，您当然可以将指针视为大小为 1 的数组，但您可能会发现这样做更清楚：

ID3D11ShaderResourceView* srvs[] = { _slopeGradient.GetAddressOf() };
_d3dContext->PSSetShaderResources(0, _countof(srvs), srvs);

ID3D11SamplerState* samplers[] = { _sampler.GetAddressOf() };
_d3dContext->PSSetSamplers(0, _countof(samplers), samplers);

另请注意，您在 HLSL 源代码中定义了遗留 Effects system 的某些元素，这些元素在标准 DirectX API 用法中被忽略。你可以删除它。

{
    Texture = (Slope);
    Filter = MIN_MAG_MIP_LINEAR;
    AddressU = clamp;
    AddressV = clamp;
}

As you are new to DirectX 11, you should look at DirectX Tool Kit.

PSSetSamplers 不起作用（像素着色器单元需要一个采样器）

PSSetSamplers doens't work (The Pixel Shader unit expects a Sampler)

shader

hlsl

directx-11

pixel-shader

c++-cx