enricobuehler
8897286aec
NVIDIA/AMD Vulkan ICDs refuse to *advertise* an HDR color space for a surface on an
IddCx indirect/virtual display, so Vulkan games (Doom: The Dark Ages, id Tech, Indiana
Jones, …) report "device does not support HDR" — even though Windows HDR, DWM compose,
and the client PQ stream all work, and the ICD happily *accepts + presents* a forced HDR
swapchain there. The whole gap is enumeration; the community (Apollo/Sunshine/VDD) wrote
this off as kernel-side / unfixable.
Add VK_LAYER_PUNKTFUNK_hdr_inject (packaging/windows/pf-vkhdr-layer/): a standalone
cdylib Vulkan implicit layer that appends {A2B10G10R10, HDR10_ST2084} + {RGBA16F, scRGB}
to vkGetPhysicalDeviceSurfaceFormats[2]KHR (no need to hook vkCreateSwapchainKHR — the
ICD doesn't validate the color space there). Self-gated on the surface monitor's actual
advanced-color state (DisplayConfig GET_ADVANCED_COLOR_INFO), so it is a complete no-op
on SDR sessions and real monitors (dedup). Always-on (registry-discovered) so it works
regardless of how a game is launched — env-scoping silently fails for already-running
Steam. Escape hatches: DISABLE_PF_VKHDR, PF_VKHDR_EXCLUDE, and a built-in kernel-anti-
cheat denylist.
The installer builds/signs/stages it and registers it under
HKLM64\SOFTWARE\Khronos\Vulkan\ImplicitLayers (opt-out "Install the HDR Vulkan layer"
task); windows-host CI fmt+clippy-gates it (msvc-only FFI).
Live-validated on the RTX box: Doom: The Dark Ages enables HDR over the pf-vdisplay
virtual display.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
18 lines
683 B
JSON
18 lines
683 B
JSON
{
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"file_format_version": "1.2.0",
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"layer": {
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"name": "VK_LAYER_PUNKTFUNK_hdr_inject",
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"type": "GLOBAL",
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"library_path": ".\\pf_vkhdr_layer.dll",
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"api_version": "1.4.280",
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"implementation_version": "1",
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"description": "punktfunk: advertise HDR10/scRGB Vulkan surface formats on the virtual display (NVIDIA/AMD ICDs hide them on indirect displays even though the ICD accepts + presents a forced HDR swapchain).",
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"functions": {
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"vkNegotiateLoaderLayerInterfaceVersion": "vkNegotiateLoaderLayerInterfaceVersion"
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},
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"disable_environment": {
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"DISABLE_PF_VKHDR": "1"
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}
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}
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}
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