Question

我正在学习Directx11编程并设置基本的计算着色器。我的第一个目标是仅检查计算着色器是否能够将任何内容写入2D纹理资源。相关代码段如下：

创建缓冲区

ID3D11Texture2D* ColoredTriangleDemo::create_render_target(ID3D11Device1* Direct3DDevice, int width, int height){
ID3D11Texture2D* renderTarget;
D3D11_TEXTURE2D_DESC renderTargetDesc;
ZeroMemory(&renderTargetDesc, sizeof(renderTargetDesc));
renderTargetDesc.BindFlags = D3D11_BIND_UNORDERED_ACCESS | D3D11_BIND_SHADER_RESOURCE;
renderTargetDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
renderTargetDesc.Height = height;
renderTargetDesc.Width = width;
renderTargetDesc.ArraySize = 1;
renderTargetDesc.MipLevels = 1;
renderTargetDesc.SampleDesc.Count = 1;
renderTargetDesc.SampleDesc.Quality = 0;
renderTargetDesc.Usage = D3D11_USAGE_DEFAULT;

HRESULT rt = Direct3DDevice->CreateTexture2D(&renderTargetDesc, NULL, &renderTarget);
if (FAILED(rt)){
    std::cout << "Error! Render target creation failed for compute shader " << rt << std::endl;
    exit;
}

//Create UAV for Compute shader
D3D11_UNORDERED_ACCESS_VIEW_DESC uavCS;
ZeroMemory(&uavCS, sizeof(uavCS));
uavCS.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
uavCS.ViewDimension = D3D11_UAV_DIMENSION_TEXTURE2D;
uavCS.Texture2D.MipSlice = 0;
HRESULT uav = Direct3DDevice->CreateUnorderedAccessView(renderTarget, &uavCS, &mUAVCS);
if (FAILED(uav)){
    std::cout << "Error! UAV Creation failed for CS " << uav << std::endl;
    exit;
}
return renderTarget;
}

计算着色器HLSL代码-现在，它只是写一些东西来检查整个设置是否正常工作

struct vertexData{
float4 position;
float2 texcoord;
float3 normal;
int    materialID;
};

StructuredBuffer<vertexData> vData : register(t0);
RWTexture2D<float4>          color : register(t1);

cbuffer bufferSize : register(b0){
    int n_input_elements;
    int n_output_x;
    int n_output_y;
    int dummy;
}

[numthreads (1, 1, 1)]
void main(uint3 dispatchThreadID : SV_DispatchThreadID){
    for (int i = 0; i < 1000; ++i){
        for (int j = 0; j < 1000; ++j){
            float2 loc = float2(float(i)/1000.f, float(j)/1000.f);
            color[loc.xy] = (i*j) % 2 ? float4(0.5f, 0.6f, 0.7f, 1.f) : float4(0.7f, 0.6f, 0.5f, 1.f);
        }
    }
}

draw方法中的渲染代码

ID3D11DeviceContext* direct3DDeviceContext = mGame->Direct3DDeviceContext();
direct3DDeviceContext->CSSetShader(mComputeShader, nullptr, 0);
direct3DDeviceContext->CSSetShaderResources(0, 1, &mSRVCS_I);
direct3DDeviceContext->CSSetUnorderedAccessViews(0, 1, &mUAVCS, NULL);

//Dispatch
direct3DDeviceContext->Dispatch(1, 1, 1);

Sleep(20);      //Sleep for 100 ms

但是，当我在Visual Studio图形调试器中看到2D纹理颜色时，会得到默认的绿屏。我在这里错过了什么吗？

谢谢

Answer 1

我发现了错误。在ComputeShader代码中，我使用浮点索引RWTexture2d（颜色），而应该使用uint2对其进行了访问。

因此索引color [loc.xy]时，loc应该为int而不是float，从而解决了该问题。

2D纹理在计算着色器中始终为黑色-Directx 11

1 个答案: