fix(pbr): use half linear for pbr basecolor

[jiayev]

Summary by CodeRabbit

• Refactor
  • Updated color conversion in certain rendering scenarios to use a more consistent gamma correction method. No changes to visible features or user interfaces.

[coderabbitai]

Walkthrough

The Diffuse(float3 color) function in the Color namespace was updated to use the LinearToGamma(color) function for gamma correction in the TRUE_PBR branch, replacing the previous direct power operation. No changes were made to public or exported entity declarations.

Changes

Cohort / File(s)	Change Summary
Shader Gamma Correction Update package/Shaders/Common/Color.hlsli	Updated Diffuse(float3 color) to use LinearToGamma(color) for gamma correction in TRUE_PBR branch; no signature changes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A bunny hopped through shader code,
Where gamma curves and colors flowed.
From power math to function call,
Linear to gamma—smoothed for all!
With whiskers twitching, bright and keen,
The rabbit made the colors clean.
🐇✨

Note

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📜 Recent review details

Configuration used: .coderabbit.yaml
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between ce2b6f1 and f4566cc.

📒 Files selected for processing (1)

• package/Shaders/Common/Color.hlsli (1 hunks)

🧰 Additional context used

🧠 Learnings (2)

📓 Common learnings

Learnt from: alandtse
PR: doodlum/skyrim-community-shaders#577
File: features/Wetness Effects/Shaders/WetnessEffects/WetnessEffects.hlsli:57-61
Timestamp: 2025-06-17T05:40:22.785Z
Learning: Default parameter values are supported in the HLSL compiler used by the skyrim-community-shaders project, contrary to standard HLSL (FXC/DXC) limitations.

package/Shaders/Common/Color.hlsli (4)

Learnt from: alandtse
PR: #577
File: features/Wetness Effects/Shaders/WetnessEffects/WetnessEffects.hlsli:57-61
Timestamp: 2025-06-17T05:40:22.785Z
Learning: Default parameter values are supported in the HLSL compiler used by the skyrim-community-shaders project, contrary to standard HLSL (FXC/DXC) limitations.

Learnt from: alandtse
PR: doodlum/skyrim-community-shaders#0
File: :0-0
Timestamp: 2025-07-01T18:01:07.079Z
Learning: In the skyrim-community-shaders project, simple scalar constants in HLSL shaders use #define (e.g., #define NTHREADS 128), while more complex constants use static const within namespaces (e.g., Math namespace in Math.hlsli). For epsilon standardization, #define is the appropriate choice since epsilon values are simple scalar constants.

Learnt from: alandtse
PR: #577
File: src/Features/WetnessEffects.h:36-36
Timestamp: 2025-06-08T11:25:14.536Z
Learning: In the skyrim-community-shaders project, boolean flags in C++ structs that interface with HLSL shaders use uint type instead of bool for compatibility reasons. This ensures consistent 4-byte size, proper 16-byte alignment in constant buffers, and cross-platform compatibility when passing data between C++ and HLSL shaders.

Learnt from: alandtse
PR: #577
File: src/Features/WetnessEffects.h:36-36
Timestamp: 2025-06-08T11:25:14.536Z
Learning: In the skyrim-community-shaders project, boolean flags in C++ structs that interface with HLSL shaders use uint type instead of bool for compatibility reasons. This ensures consistent size, alignment, and cross-platform compatibility when passing data to shader constant buffers.

🔇 Additional comments (1)

package/Shaders/Common/Color.hlsli (1)

79-79: Approved: Half-linear gamma correction uniformly applied

• No other shader files reference TrueLinearToGamma after this change.
• LinearToGamma (1.8 γ) is now consistently used across all PBR and lighting shader paths.

✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment

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