DirectX11-具有流输出的几何着色器

我正在尝试从几何着色器中流式传输数据，以用作顶点缓冲区以输入到另一个着色器中。但是，这似乎不起作用，并且调试层什么也没告诉我。缓冲区说明有问题吗？

这是我创建输出缓冲区的方法：

D3D11_BUFFER_DESC outputBufferDesc;
ZeroMemory(&outputBufferDesc, sizeof(outputBufferDesc));
outputBufferDesc.ByteWidth = sizeof(XMFLOAT4) + 2 * sizeof(XMFLOAT3);
outputBufferDesc.Usage = D3D11_USAGE_DEFAULT;
outputBufferDesc.BindFlags = D3D11_BIND_STREAM_OUTPUT;
outputBufferDesc.CPUAccessFlags = 0;
outputBufferDesc.MiscFlags = 0;
outputBufferDesc.StructureByteStride = 0;

result = renderer->CreateBuffer(&outputBufferDesc, NULL, &outputBuffer);
if (result != S_OK)
{
    MessageBox(NULL, filename, L"Failed to create stream output buffer", MB_OK);
    exit(0);
}

UINT offset[1] = { 0 };
deviceContext->SOSetTargets(1, &outputBuffer, offset);

绘制调用第一个着色器：

deviceContext->VSSetShader(vertexShader, NULL, 0);
deviceContext->PSSetShader(pixelShader, NULL, 0);
deviceContext->GSSetShader(streamOutputGeometryShader, NULL, 0);

// Render the triangle.
deviceContext->DrawIndexed(indexCount, 0, 0);

UINT offset[1] = { 0 };
ID3D11Buffer* pNullBuffer = 0;
deviceContext->SOSetTargets(1, &pNullBuffer, offset);

然后将信息从该缓冲区复制到第二个缓冲区：

D3D11_BUFFER_DESC vertexBufferDesc;
ZeroMemory(&vertexBufferDesc, sizeof(vertexBufferDesc));
vertexBufferDesc.ByteWidth = sizeof(XMFLOAT4) + 2 * sizeof(XMFLOAT3);
vertexBufferDesc.Usage = D3D11_USAGE_DEFAULT;
vertexBufferDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
vertexBufferDesc.CPUAccessFlags = 0;
vertexBufferDesc.MiscFlags = 0;
vertexBufferDesc.StructureByteStride = 0;

result = renderer->CreateBuffer(&vertexBufferDesc, NULL, &vertexBuffer);
if (result != S_OK)
{

    MessageBox(NULL, L"Failed to create output mesh vertex buffer", L"Failed", MB_OK);
    exit(0);

}

deviceContext->CopyResource(vertexBuffer, buffer);

并在此处使用顶点缓冲区为网格设置输入拓扑：

unsigned int stride;
unsigned int offset;

// Set vertex buffer stride and offset.
stride = sizeof(XMFLOAT4) + 2 * sizeof(XMFLOAT3);
offset = 0;

deviceContext->IASetVertexBuffers(0, 1, &vertexBuffer, &stride, &offset);
deviceContext->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);

最后，第二个着色器的绘制调用很简单：

deviceContext->DrawAuto();

编辑：在几何着色器中正确计算了几何，但未将其流出。我在下面包含了几何着色器创建代码：

D3D11_SO_DECLARATION_ENTRY SODeclarationEntry[3] =
{

    { 0, "SV_POSITION", 0, 0, 4, 0 },
    { 0, "NORMAL", 0, 0, 3, 0 },
    { 0, "TEXCOORD", 0, 0, 3, 0 }

};

// Create the geometry shader from the buffer.
result = renderer->CreateGeometryShaderWithStreamOutput(geometryShaderBuffer->GetBufferPointer(), geometryShaderBuffer->GetBufferSize(), SODeclarationEntry, _countof(SODeclarationEntry),
    NULL, 0, D3D11_SO_NO_RASTERIZED_STREAM, NULL, &streamOutputGeometryShader);