DirectX11 Mapping/Unmapping has no effect on rendered geometry - c++

Question

I have a simple rendering program I just made, but it refuses to draw anything but what I set the initial vertices to. Even if I call Map() and Unmap(), the geometry doesn't seem to change. I have a feeling it has to do with Map() and Unmap(), but I'm not sure. Right now, my initial vertex data consists of one triangle. Then I map the vertex buffer with a new set of vertices which consists of two triangles, but they aren't rendered. Only one triangle is rendered even though I pass in 6 for the vertex count in the draw function. Here is my setup code:
VertexData vertexData[] =
{
{0.0f,0.0f,0.0f,0.0f,0.0f,1.0f,0.0f,0.0f},
{0.0f,1.0f,0.0f,0.0f,0.0f,1.0f,0.0f,0.0f},
{1.0f,1.0f,0.0f,0.0f,0.0f,1.0f,0.0f,0.0f}
};
D3D11_BUFFER_DESC bd;
ZeroMemory(&bd,sizeof(bd));
bd.Usage = D3D11_USAGE_DYNAMIC;
bd.ByteWidth = sizeof(VertexData)*256;
bd.BindFlags = D3D11_BIND_VERTEX_BUFFER;
bd.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
D3D11_SUBRESOURCE_DATA vertexBufferData;
vertexBufferData.pSysMem = vertexData;
vertexBufferData.SysMemPitch = 0;
vertexBufferData.SysMemSlicePitch = 0;
_device->CreateBuffer(&bd, &vertexBufferData, &_renderBuffer);
Mapping function:
data is a vector containing six VertexData structs, for six vertices
D3D11_MAPPED_SUBRESOURCE ms;
ZeroMemory(&ms,sizeof(D3D11_MAPPED_SUBRESOURCE));
_deviceContext->Map(_renderBuffer,NULL,D3D11_MAP_WRITE_DISCARD,NULL,&ms);
memcpy(ms.pData,&data[0],sizeof(VertexData)*data.size());
_deviceContext->Unmap(_renderBuffer,NULL);
And here is my rendering code:
_deviceContext->ClearRenderTargetView(_backBuffer,D3DXCOLOR(0.0f,0.0f,0.0f,1.0f));
_deviceContext->Draw(6,0);
_swapChain->Present(0,0);
EDIT: Disabled backface culling, but the triangle is still not appearing.
Mapping Function
void Render::CopyDataToBuffers(std::vector<VertexData> data)
{
D3D11_MAPPED_SUBRESOURCE ms;
ZeroMemory(&ms,sizeof(D3D11_MAPPED_SUBRESOURCE));
_deviceContext->Map(_renderBuffer,NULL,D3D11_MAP_WRITE_DISCARD,NULL,&ms);
memcpy(ms.pData,&data[0],sizeof(VertexData)*data.size());
_deviceContext->Unmap(_renderBuffer,NULL);
}
Calling of Mapping function
std::vector<VertexData> vertexDataVec;
vertexDataVec.push_back(vertexData[0]);
vertexDataVec.push_back(vertexData[1]);
vertexDataVec.push_back(vertexData[2]);
vertexDataVec.push_back(vertexData[3]);
vertexDataVec.push_back(vertexData[4]);
vertexDataVec.push_back(vertexData[5]);
Render::GetRender().CopyDataToBuffers(vertexDataVec);

Answer 1

To fix the problem, I just had to create a ID3D11RasterizerState and disable culling.
Here is the structure:
ID3D11RasterizerState* rasterizerState = NULL;
D3D11_RASTERIZER_DESC rd =
{
D3D11_FILL_SOLID,
D3D11_CULL_NONE,
TRUE,
1,
10.0F,
1.0F,
TRUE
};
_device->CreateRasterizerState(&rd,&rasterizerState);
_deviceContext->RSSetState(rasterizerState);