KhronosGroup / KhronosGroup/Vulkan-Docs
Allow querying HGIG HDR metadata for outputs
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Since Jul 26, 2023.
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Description
The HGIG recommendations suggest exposing three fields to game developers to let them best do tonemapping in HDR: MaxFullFrameToneMapLuminance (MaxFFTML), MaxToneMapLuminance (MaxTML) and MinToneMapLuminance (MinTML).
DXGI already supports querying these values from an IDXGIOutput6, however Vulkan doesn't seem to expose the same functionality yet. Thus, it's difficult to retrieve the display-specific parameters for correct HDR tonemapping.
Note that Vulkan does have support for setting application-provided SMPTE ST.2086 HDR metadata, but this approach is discouraged, because TVs and display environments have not provided consistent display tonemapping in response to this metadata. See the note / remarks on the equivalent DXGI functionality
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