DirectX

Question

我正在测试在计算着色器中写入 2D 和 3D 纹理，输出由 32 位浮点数组成的渐变噪声纹理。写入 2D 纹理工作正常，但写入 3D 纹理则不然。与 2D 纹理相比，创建 3D 纹理时是否需要额外考虑？

下面是我如何定义 3D 纹理的代码：

HRESULT BaseComputeShader::CreateTexture3D(UINT width, UINT height, UINT depth, DXGI_FORMAT format, ID3D11Texture3D** texture)
{

D3D11_TEXTURE3D_DESC textureDesc;
ZeroMemory(&textureDesc, sizeof(textureDesc));
textureDesc.Width = width;
textureDesc.Height = height;
textureDesc.Depth = depth;
textureDesc.MipLevels = 1;
textureDesc.Format = format;
textureDesc.Usage = D3D11_USAGE_DEFAULT;
textureDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE | D3D11_BIND_UNORDERED_ACCESS;
textureDesc.CPUAccessFlags = 0;
textureDesc.MiscFlags = 0;

return renderer->CreateTexture3D(&textureDesc, 0, texture);

}

HRESULT BaseComputeShader::CreateTexture3DUAV(UINT depth, DXGI_FORMAT format, ID3D11Texture3D** texture, ID3D11UnorderedAccessView** unorderedAccessView)
{

D3D11_UNORDERED_ACCESS_VIEW_DESC uavDesc;
ZeroMemory(&uavDesc, sizeof(uavDesc));
uavDesc.Format = format;
uavDesc.ViewDimension = D3D11_UAV_DIMENSION_TEXTURE3D;
uavDesc.Texture3D.MipSlice = 0;
uavDesc.Texture3D.FirstWSlice = 0;
uavDesc.Texture3D.WSize = depth;

return renderer->CreateUnorderedAccessView(*texture, &uavDesc, unorderedAccessView);

}

HRESULT BaseComputeShader::CreateTexture3DSRV(DXGI_FORMAT format, ID3D11Texture3D** texture, ID3D11ShaderResourceView** shaderResourceView)
{

D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
ZeroMemory(&srvDesc, sizeof(srvDesc));
srvDesc.Format = format;
srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE3D;
srvDesc.Texture3D.MostDetailedMip = 0;
srvDesc.Texture3D.MipLevels = 1;

return renderer->CreateShaderResourceView(*texture, &srvDesc, shaderResourceView);

}

以及我如何在计算着色器中写入它：

// The texture we're writing to
RWTexture3D<float> outputTexture : register(u0);

[numthreads(8, 8, 8)]
void main(uint3 DTid : SV_DispatchThreadID)
{

float noiseValue = 0.0f;
float value = 0.0f;
float localAmplitude = amplitude;
float localFrequency = frequency;

// Loop for the number of octaves, running the noise function as many times as desired (8 is usually sufficient)
for (int k = 0; k < octaves; k++)
{

    noiseValue = noise(float3(DTid.x * localFrequency, DTid.y * localFrequency, DTid.z * localFrequency)) * localAmplitude;

    value += noiseValue;

    // Calculate a new amplitude based on the input persistence/gain value
    // amplitudeLoop will get smaller as the number of layers (i.e. k) increases
    localAmplitude *= persistence;
    // Calculate a new frequency based on a lacunarity value of 2.0
    // This gives us 2^k as the frequency
    // i.e. Frequency at k = 4 will be f * 2^4 as we have looped 4 times
    localFrequency *= 2.0f;

}

// Output value to 2D index in the texture provided by thread indexing
outputTexture[DTid.xyz] = value;

}

最后，我是如何运行着色器的：

// Set the shader
deviceContext->CSSetShader(computeShader, nullptr, 0);
// Set the shader's buffers and views
deviceContext->CSSetConstantBuffers(0, 1, &cBuffer);
deviceContext->CSSetUnorderedAccessViews(0, 1, &textureUAV, nullptr);

// Launch the shader
deviceContext->Dispatch(512, 512, 512);

// Reset the shader now we're done
deviceContext->CSSetShader(nullptr, nullptr, 0);

// Reset the shader views
ID3D11UnorderedAccessView* ppUAViewnullptr[1] = { nullptr };
deviceContext->CSSetUnorderedAccessViews(0, 1, ppUAViewnullptr, nullptr);

// Create the shader resource view for access in other shaders
HRESULT result = CreateTexture3DSRV(DXGI_FORMAT_R32_FLOAT, &texture, &textureSRV);
if (result != S_OK)
{

    MessageBox(NULL, L"Failed to create texture SRV after compute shader execution", L"Failed", MB_OK);
    exit(0);

}

Answer 1

我的错误，简单的错误。计算着色器线程数量有限。在计算着色器中，您被限制为总共 1024 个线程，并且调度调用不能调度超过 65535 个线程组。 HLSL 编译器会捕获前一个问题，但 Visual C++ 编译器不会捕获后一个问题。

Answer 2

如果你创建一个 512 * 512 * 512 的纹理（这似乎是你想要达到的），你的调度需要按组划分：

deviceContext->Dispatch(512 / 8, 512 / 8, 512 / 8);

在您之前的案例中，调度是： 512*8 * 512*8 * 512*8 = 68719476736 单位

这很可能触发超时检测并导致驱动程序崩溃

另外 65535 的限制是每个维度的，所以在你的情况下你是完全安全的运行这个。

最后一个，您可以在创建 3d 纹理后（在调度调用之前）立即创建着色器资源视图和无序视图。

通常建议这样做以避免混合上下文代码和资源创建代码。

在创建资源时，您的检查也无效：

if (result != S_OK)

HRESULT 成功条件是 >= 0

您可以改用内置宏，例如：

if (SUCCEEDED(result))

DirectX - 写入 3D 纹理导致显示驱动程序失败

DirectX - Writing to 3D Texture Causing Display Driver Failure

c++

hlsl