brucelevis/realengine

My toy engine, mainly for rendering expariment and prototyping.

RealEngine

My toy engine, mainly for rendering experiment and prototyping. It requires a GPU which supports DX12 Ultimate with latest driver. It is not supposed to be used in production, and prefers clean design and code over being heavily optimized.

some highlights

• utilize latest DX12 features, such as raytracing, mesh shaders, HLSL 2021, etc.
• render graph based architecture, with automatically barriers and transient resources management
• fully bindless resources with SM6.6
• two-phase occlusion culling (like Ubi's GPU driven pipeline). no matter how many different meshes and textures, always two drawcalls(indirect DispatchMesh) per PSO.
• hybrid rendering with raytracing
• Print, DrawLine functions in shaders which can be very useful for debugging

planned features

• render graph(barriers, resource aliasing, async compute)
• GTAO
• diffuse & specular GI
• clustered shading
• Bloom
• Auto Exposure
• TAA
• CAS
• meshlet
• RTX
• a reference pathtracer
• maybe volumetric cloud/fog, water/ocean simulation, large-scale landscape, or any random things

AMD related issues

tested on RX6600(win11, Adrenalin 21.12.1)

• indirect DispatchMesh results in GPU hang after a few seconds

  void GpuDrivenDebugPrint::Draw(IGfxCommandList* pCommandList)
  {
      ...
  
      if (m_pRenderer->GetDevice()->GetVendor() == GfxVendor::AMD)
      {
          pCommandList->DispatchMesh(100, 1, 1);
      }
      else
      {
          pCommandList->DispatchMeshIndirect(m_pDrawArugumentsBuffer->GetBuffer(), 0);
      }
  }

• using SV_IsFrontFace in an AS-MS-PS combine results in DXGI_ERROR_DRIVER_INTERNAL_ERROR when creating the PSO

  D3D12: Removing Device.
  D3D12 WARNING: ID3D12Device::RemoveDevice: Device removal has been triggered for the following reason (DXGI_ERROR_DRIVER_INTERNAL_ERROR: There is strong evidence that the driver has performed an undefined operation; but it may be because the application performed an illegal or undefined operation to begin with.). [ EXECUTION WARNING #233: DEVICE_REMOVAL_PROCESS_POSSIBLY_AT_FAULT]