MDL SDK 2020.1.2 (334300.5582): 12 Nov 2020

ABI compatible with the MDL SDK 2020.1.2 (334300.5582) binary release
(see https://developer.nvidia.com/mdl-sdk)

Added and Changed Features

• MDL Compiler and Backends

  • A new HLSL backend option use_renderer_adapt_microfacet_roughness has been added, which
    allows a renderer to adapt the roughness values provided to microfacet BSDFs right before
    using them. The prototype of the function the renderer has to provide is float2 mdl_adapt_microfacet_roughness(Shading_state_material state, float2 roughness_uv).
  • A new execution context option ignore_noinline has been added, which allows to ignore
    anno::noinline() annotations, enabling inlining when creating a compiled material.
    Previously this happened later when generating code for distribution functions. But
    optimizing at this time could lead to a changed DAG which may not contain the nodes requested
    by the user anymore.

Fixed Bugs

• General

  • Fixed a crash in the i18n tool when accessing module annotations.

• MDL Compiler and Backends

  • Fixed wrong optimization for ternary operators selecting different vector elements in HLSL
    always returning the true expression.
  • Fixed wrong PTX version used for sm_86.
  • In single-init mode, don't let a requested geometry.normal expression calculate the normal
    again.
  • Fixed analysis of derivative variants of functions not being recognized as depending on
    state::normal().
  • Reduced number of texture result slots used in generated init functions.
  • Do not generate HLSL code containing min16int to ensure compatibility to Slang.
  • Fixed translation of conversion of an 8-bit to a 32-bit integer for HLSL.