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Codex
4381dc33a6
Convert explicit BT.2020 nonconstant-luminance PQ/HLG NV12/P010 into FP16 linear scRGB on the GPU. Use FP16 movie history and a dedicated HDR10/scRGB presentation fragment, preserving absolute luminance and the existing core HDR uniform ABI. The retained backend capability gates HDR activation; unsupported renderer/color combinations retain software fallback. Generic planar texture imports use the same HDR conversion. Restore history, staging texture, dimensions and movie state if destination allocation or encoder setup refuses an import. Persistent history scratch avoids a history-sized stack allocation. CPU/deferred frames clear movie color state and reinitialize history when leaving HDR. Validation: complete GCC/Clang portable Metal jobs, final 128 movie and 96 planar mock cases, Windows C89/GDB, 94 workflow selftests, 44-driver thread-state check, complete compile matrix with ARC/MRC Metal rows, final focused Metal rows and scoped native-presentation Objective-C syntax. Native PQ/HLG conversion/history and stock-MSL presentation pixel fixtures are added; actual Apple GPU and full player acceptance remain pending.