Creating a texture for pixel shader and updating the texture in DirectX 11.

VideoTexture.cpp

//------------------------------------------------
// Creating texture for rendering video
//------------------------------------------------

// ID3D11Device* Device

ID3D11Texture2D* texture = nullptr;

D3D11_TEXTURE2D_DESC td;
RtlZeroMemory(&td, sizeof(D3D11_TEXTURE2D_DESC));
td.Width = textureWidth;
td.Height = textureHeight;
td.MipLevels = 1;
td.ArraySize = 1;
td.Format = DXGI_FORMAT_R8_UNORM;
td.SampleDesc.Count = 1;
td.Usage = D3D11_USAGE_DYNAMIC;
td.BindFlags = D3D11_BIND_SHADER_RESOURCE;
td.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;

hr = Device->CreateTexture2D(&td, nullptr, &texture);




//------------------------------------------------
// Updating texture
//------------------------------------------------

// ID3D11DeviceContext* DeviceContext

D3D11_MAPPED_SUBRESOURCE resource;
UINT subresource = D3D11CalcSubresource(0, 0, 0);
HRESULT hr = DeviceContext->Map(texture, subresource, D3D11_MAP_WRITE_DISCARD, 0, &resource);

// update using data pointer
BYTE* ptr = reinterpret_cast<BYTE*>(resource.pData);


DeviceContext->Unmap(texture, subresource);