DirectX:用计算着色器写入纹理

DirectX : Write to texture with Compute Shader

本文关键字：纹理 计算 DirectX      更新时间：2023-10-16

我试图用hlsl中的compute着色器写入纹理。

创建纹理：

D3D11_TEXTURE2D_DESC textureDesc;
ZeroMemory(&textureDesc, sizeof(textureDesc));
textureDesc.Width = 512;
textureDesc.Height = 512;
textureDesc.MipLevels = 1;
textureDesc.ArraySize = 1;
textureDesc.Format = DXGI_FORMAT_R32G32B32A32_FLOAT;
textureDesc.SampleDesc.Count = 1;
textureDesc.SampleDesc.Quality = 0;
textureDesc.Usage = D3D11_USAGE_DEFAULT;
textureDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE | D3D11_BIND_UNORDERED_ACCESS;
textureDesc.CPUAccessFlags = 0;
textureDesc.MiscFlags = 0;
m_tex = 0;
hr = device->CreateTexture2D(&textureDesc, 0, &m_tex);

创建无人机：

D3D11_UNORDERED_ACCESS_VIEW_DESC descUAV;
ZeroMemory(&descUAV, sizeof(descUAV));
descUAV.Format = DXGI_FORMAT_UNKNOWN;
descUAV.ViewDimension = D3D11_UAV_DIMENSION_TEXTURE2D;
descUAV.Texture2D.MipSlice = 0;
hr = device->CreateUnorderedAccessView(m_tex, &descUAV, &m_uavAccess);

创建SRV(查看纹理(：`

D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
srvDesc.Format = textureDesc.Format;
srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
srvDesc.Texture2D.MostDetailedMip = 0;
srvDesc.Texture2D.MipLevels = 1;
hr = device->CreateShaderResourceView(m_tex, &srvDesc, &m_srvTexOutput);

着色器：

RWTexture2D<float4> gOutput : register(u0);
[numthreads(16, 16, 1)]
void main(int3 dispatchThreadID : SV_DispatchThreadID) // Thread ID
{
    gOutput[dispatchThreadID.xy] = float4(0.0f, 1.0f, 0.0f, 1.0f);
}

问题是纹理总是黑色的(计算着色器不写入纹理(。

感谢您的帮助！：D

问题在于，您需要在将其用作不同着色器调用(draw/ps(的输入之前使GPU冲洗表面。您可以通过将无效资源绑定到上一个着色器阶段来做到这一点。

    ID3D11UnorderedAccessView *NullUav = nullptr;
    m_DeviceContext->CSSetUnorderedAccessViews(0, 1, &NullUav, nullptr);

这应该足以告诉图形驱动程序将资源从写入或过渡到读取资源。

如果您使用D3D12或Vulkan，则在从写入到阅读时需要资源障碍。

示例渲染循环：

    // Run compute kernel output to UAV.
    m_DeviceContext->CSSetShader(m_ComputeShader, NULL, 0);
    m_DeviceContext->CSSetUnorderedAccessViews(0, 1, &m_UAV, nullptr);
    m_DeviceContext->Dispatch(DispatchX, DispatchY, DispatchZ);
    // Run the raster pipeline to present the UAV values to screen.
    ID3D11UnorderedAccessView *NullUav = nullptr;
    ID3D11ShaderResourceView* NullSrv = nullptr;
    ID3D11DepthStencilView *NullDsv = nullptr;
    m_DeviceContext->PSSetShader(m_PixelShader, NULL, 0);
    m_DeviceContext->VSSetShader(m_VertexShader, NULL, 0);
    m_DeviceContext->CSSetUnorderedAccessViews(0, 1, &NullUav, nullptr);
    m_DeviceContext->PSSetShaderResources(0, 1, &m_SRV);
    m_DeviceContext->IASetIndexBuffer(m_IndexBuffer, DXGI_FORMAT_R32_UINT, 0);
    m_DeviceContext->PSSetSamplers(0, 1, &m_SamplerState);
    m_DeviceContext->OMSetRenderTargets(1, &m_RenderTarget, NullDsv);
    m_ViewPort.Width = (float)RTWidth;
    m_ViewPort.Height = (float)RTHeight;
    m_ViewPort.MaxDepth = 1.0f;
    m_DeviceContext->RSSetViewports(1, &m_ViewPort);
    m_DeviceContext->DrawIndexed(4, 0, 0);
    //  Present the final result.
    int Result = m_SwapChain->Present(1, 0);
    if (Result == DXGI_ERROR_DEVICE_REMOVED || Result == DXGI_ERROR_DEVICE_RESET) {
        // Reinitialize the renderer..
    }
    // Unset the SRV
    m_DeviceContext->PSSetShaderResources(0, 1, &NullSrv);

问题是我在同一纹理上绑定了无人机和srv。

我解决了创建两个纹理的问题：一种绑定到无人机，另一个绑定到SRV。

Compute着色器在UAV上写入，每帧，我都会用deviceContext->CopyResource(m_texSRV, m_texUAV);

将数据复制在SRV上

现在的问题是性能，CopyResource是一个昂贵的操作。它还有其他解决方案较便宜吗？

感谢您的帮助！：D

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