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@acmarrs-nvidia acmarrs-nvidia released this 19 Oct 18:06
· 10 commits to main since this release
v1.3.0
7d50236

SDK

  • Dynamic Library
    • Adds support for building and using the SDK as a dynamic library (*.dll, *.so)
    • Removes the use of std in SDK headers
  • DDGIVolume Probe Counts
    • Changes all GPU-side texture resources to Texture2DArrays (D3D12 and Vulkan)
    • Increases the theoretical maximum number of probes per volume to ~33.5 million (128x2048x128)
    • Increases the practical maximum probes per volume increases to 2,097,152 probes (with the default texel format settings)
      • This is a 2x increase over the previous maximum of 1024x32x32 (1,048,576 probes) and is limited by API restrictions: a single D3D12/Vulkan resource cannot be larger than 4GB
      • More importantly, this change enables a more flexible and (at times) less wasteful memory layout since monolithic 2D texture atlases are no longer used for DDGIVolume probe resources
  • Bindless Resources
    • Adds support for Shader Model 6.6 Dynamic Resources (aka Descriptor Heap bindless) in D3D12
    • Reworks how bindless resource indices are specified for both Resource Array and Descriptor Heap style bindless implementations (D3D12 and Vulkan)
  • Probe Border Updates, Probe Blending, and GPU Utilization
    • Moves probe border update work into the probe blending passes
      • This removes the need for separate border update compute passes, simplifying SDK use while also providing a small performance benefit
    • Adjusts probe blending thread group sizes to increase GPU utilization and enable probe ray counts in factors of 64 to be stored in shared memory (no more unusual ray counts like 144, 288, etc).
  • Vulkan Push Constants
    • Updates the Vulkan push constants implementation to be more flexible and customizable so you can tailor them to your application's setup
  • Other Improvements and Fixes
    • Represents probe counts with 10 bits (instead of 8) in DDGIVolumeDescGPUPacked
    • Adds GetRayDispatchDimensions() to make probe ray tracing dispatches easier to setup
    • Adds GetGPUMemoryUsedInBytes() to make DDGIVolume memory tracking easier
    • Adds ValidatePackedData() to ensure correct functionality of the PackDDGIVolumeDescGPU() and UnpackDDGIVolumeDescGPU() functions, executes in Debug configurations as part of UploadDDGIVolumeConstants().
    • Moves shader define validation code to separate files to make the main SDK shader code more friendly and readable
    • Adds fix for EulerAnglesToRotationMatrixYXZ() not producing correct DDGIVolume rotations across all coordinate systems
    • Adds ConvertEulerAngles() convenience function to convert euler angles to alternate coordinate systems

Test Harness

  • Improvements
    • Adds support for RTXGI SDK v1.3.0 features
    • Reorganizes the (D3D12) global root signature / (Vulkan) pipeline layout to bindlessly index texture array resources
    • Eliminates the visualization-specific descriptor heap - all descriptors are now part of the global descriptor heap
    • Uses the D3D12 Agility SDK v1.606.3 to access Shader Model 6.6+ features
    • Reworks shader compilation code to use latest DXC interfaces, explicitly links DXC
    • Adds support for storing DDGIVolume texture array data to disk (for debug / regression)
    • Sets the COORDINATE_SYSTEM define through CMake, based on the SDK's RTXGI_COORDINATE_SYSTEM define. The Test Harness and RTXGI SDK can no longer have mismatching coordinate systems.
    • Scene graph node transforms are now converted to the selected coordinate system
    • Test Harness converts all config file positions, directions, and rotations to the selected coordinate system
      • All scene config files updated to specify right hand, y-up positions, directions, and rotations.
    • Scene Cache
      • Coordinate system of the scene geometry is now stored in the cache file
      • Cache files with mismatching coordinate system are rejected and the cache file is rebuilt
      • Cache files are built for binary (.glb) GLTF files too now
  • Bug Fixes
    • Adds several fixes for issues with Vulkan timestamps
    • Adds fix to properly compute bounding boxes, taking mesh instance transforms into account for the chosen coordinate system
    • Adds fix so probe visualization spheres are not inside out in left handed coordinate systems
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