[BVPR24]

Pull request for my Project Motor Racing RenoDX HDR mod.

[Copilot]

Copilot review overview

🔵 Needs a closer look

It is a large game-specific HDR mod built on complex decompiled shaders that need in-game visual verification, and it contains an incomplete Preset Off reset that must be fixed and re-validated by a human.

Review effort: Balanced
Findings: 1

Open (1)

• Preset Off leaves grading controls at non-default values · New

What changed in this PR

This PR adds a new RenoDX HDR addon for the game Project Motor Racing. It upgrades the game's SDR swapchain/intermediate resources to R16G16B16A16_FLOAT, injects HDR tone-mapping, color-grading, and bloom controls, and reworks the game's output/mirror/overlay pixel shaders to bridge the vanilla log-encoded LUT into an HDR display-mapped result. The HDR path is a proper bridge: it builds an engineered NeutralSDR baseline, samples the vanilla LUT in its log domain, then uses the three-argument UpgradeToneMap(untonemapped, neutral_sdr, graded_sdr) before per-channel neutral display mapping — so default grading values are neutral and preserve the vanilla look while extending range. Output mode prefers HDR10 and only falls back to scRGB on AMD/D3D12 as a compatibility case.

Changes:

• New addon.cpp wiring settings, Preset Off, device/swapchain output-mode selection (HDR10 vs scRGB), and resource upgrades.
• New shared.h/common.hlsl defining the injection struct, RenoDX defines, and grading/neutral-SDR/N2 display-mapping helpers.
• Reworked output/mirror/overlay shaders implementing the vanilla-LUT HDR bridge and SwapChainPass/RenderIntermediatePass encoding.

File	Description
src/​games/​projectmotorracing/​addon.cpp	Addon entrypoint: settings, Preset Off, device/swapchain setup, resource upgrades. Preset Off omits several grade resets.
src/​games/​projectmotorracing/​shared.h	Injection struct and RenoDX tone-map/swapchain defines; valid define wiring.
src/​games/​projectmotorracing/​common.hlsl	ApplyCustomGrade1/2, NeutralSDR, N2PerChannelLMS helpers; APIs verified to exist.
src/​games/​projectmotorracing/​output2_0xDA035448.ps_6_0.hlsl	Main scene pass: bloom, vanilla-LUT HDR bridge via 3-arg UpgradeToneMap, overlay composite, SwapChainPass.
src/​games/​projectmotorracing/​output1_0x4AF5222F.ps_6_0.hlsl	Scene+overlay composite into SwapChainPass.
src/​games/​projectmotorracing/​mirror_0x6872F9D6.ps_6_0.hlsl	Mirror/reflection pass grading; Vanilla/0 saturate clamp emulation.
src/​games/​projectmotorracing/​steam_profile_icon_0x7626ED97.ps_6_0.hlsl	Overlay icon linearized via gamma::DecodeSafe for the upgraded float buffer.

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