[ASDAlexander77]

The next NVRHI step: nvrhi_direct no longer reads its texture back through Donut. It goes through NVRHI's interfaces end to end.

• core/nvrhi.ts:
  • entireTexture() (nvrhi::TextureSlice's defaults)
  • createStagingTexture()
  • mapStagingTexture() (returns the mapped rows; the row pitch comes back through a Ref<index>)
  • copyTexture() (texture to texture) and copyTextureToStaging()
  • layoutMatches() also compares TextureSlice (the size comes from donut_interop.cpp)
• nvrhi_direct:
  • copies the drawn texture into a second texture, then that into a staging texture
  • maps the staging texture and reads the pixels row by row (rows are 256 bytes apart on D3D12)
  • checks IStagingTexture::getDesc
  • app.readTextureLevel is no longer used
• The two copyTexture overload calls pass their textures through | null locals: until a tslang release includes @cpp overloads take a class for T | null and for its base class, in a partial resolve too TypeScriptCompiler#577 (TSLANG_ISSUES.md Add bundles (D3D12Bundles) #19), a class argument fits no overload.

Verified on tslang pre-alpha101:

• Windows CTest 61/61
• nvrhi_direct with -dx12 -debug and -vk -debug
• JIT (run_jit.bat, donut_interop_shared rebuilt): nvrhi_direct (dx12 and vk, -debug) and headless
• Android emulator: headless and nvrhi_direct pass on x86_64 and on arm64 (translated), with fresh binaries
• Negative check: with the texture-to-texture copy left out, the readback is all zeros and the test fails

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