Implement PyMaterialXRenderSlang Python bindings

[ppenenko]

Summary

Addresses Phase 2 of #57.

This PR implements the PyMaterialXRenderSlang Python C++ extension module, exposing the native Slang hardware renderer (MaterialXRenderSlang) to Python:

1. source/PyMaterialX/PyMaterialXRenderSlang/ Module:
   • PyModule.cpp: Defines PYBIND11_MODULE(PyMaterialXRenderSlang, mod).
   • PySlangRenderer.cpp: Exposes SlangRenderer (create, initialize, createProgram, validateInputs, render, renderTextureSpace, captureImage, getProgram).
   • PySlangTextureHandler.cpp: Exposes SlangTextureHandler (create, bindImage, unbindImage, createRenderResources, releaseRenderResources).
   • PyTextureBaker.cpp: Exposes TextureBakerSlang.
   • CMakeLists.txt: Configures module build and installs dependent runtime DLLs.
2. C++ Fixes for Slang Renderer Module Dependencies:
   • Added MaterialXRenderHw to MaterialXRenderSlang modules to resolve SimpleWindow symbol dependencies.
   • Included SlangFramebuffer.h in TextureBaker.h for complete type definition when instantiated.
   • Reordered add_subdirectory(source/MaterialXRenderHw) in CMakeLists.txt so it is compiled whenever Slang rendering is active.
3. Windows DLL Search Path Support:
   • Updated python/MaterialX/__init__.py to ensure os.add_dll_directory is called for both the package directory and the installation bin/ directory on Windows, allowing PyMaterialXRenderSlang to find slang.dll automatically.

Verification

• Built target PyMaterialXRenderSlang and installed into environment via cmake --install build --config Debug.
• Verified in Python:

  import MaterialX as mx
  import MaterialX.PyMaterialXRenderSlang as mx_render_slang
  renderer = mx_render_slang.SlangRenderer.create(512, 512)
  renderer.initialize()

  Result:

  Layer: (Info): IRHI::createDevice: Debug layer is enabled.
  Successfully created SlangRenderer: <MaterialX.PyMaterialXRenderSlang.SlangRenderer object>
  Successfully initialized SlangRenderer with slang-rhi on GPU!
  

[Copilot]

Pull request overview

Adds Python bindings for the Slang renderer and supporting build/runtime integration.

Changes:

• Adds renderer, texture-handler, and texture-baker bindings.
• Integrates the module into CMake and documentation targets.
• Updates renderer dependencies and Windows DLL search paths.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
CMakeLists.txt	Enables hardware-renderer support for Slang builds.
python/MaterialX/__init__.py	Configures Windows DLL search paths.
source/MaterialXRenderSlang/CMakeLists.txt	Adds the hardware-rendering dependency.
source/MaterialXRenderSlang/TextureBaker.h	Includes the complete framebuffer type.
source/PyMaterialX/CMakeLists.txt	Registers the new Python module.
source/PyMaterialX/PyMaterialXRenderSlang/CMakeLists.txt	Builds and installs the extension.
source/PyMaterialX/PyMaterialXRenderSlang/PyModule.cpp	Defines module initialization.
source/PyMaterialX/PyMaterialXRenderSlang/PySlangRenderer.cpp	Binds SlangRenderer.
source/PyMaterialX/PyMaterialXRenderSlang/PySlangTextureHandler.cpp	Binds SlangTextureHandler.
source/PyMaterialX/PyMaterialXRenderSlang/PyTextureBaker.cpp	Binds the Slang texture baker.

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[Copilot]

Pull request overview

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

Suppressed comments (1)

source/PyMaterialX/PyMaterialXRenderSlang/CMakeLists.txt:42

• The pinned slang-rhi project only copies these compiler libraries into SLANG_RHI_BINARY_DIR on Windows; on Linux and macOS the imported slang target points to the downloaded library in its package directory. Consequently both non-Windows paths here are absent, OPTIONAL silently skips them, and the installed extension cannot load its Slang compiler dependency. Install $<TARGET_FILE:slang> for both non-Windows branches instead of guessing output filenames.

        ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/libslang.dylib