title: D3D12 ERROR: GPU-BASED VALIDATION: Draw, Uninitialized root argument accessed. Shader Stage: PIXEL, Root Parameter Index: [1]
body: <p>This took me a while to figure as a D3D12 newbie and I did not find anything searching the web.
  Shaders compiled fine, all resources acquired but the output kept being black. After setting debug level to max and enabled GPU validation I got the error message, followed by some kind of assembler trace and operand dump.</p>