refactor: consolidate PBR direct lighting calculations

[alandtse]

Add ProcessPBRDirectLight function to standardize and reuse
PBR lighting logic across shader call sites.

Summary by CodeRabbit

• New Features
  • Introduced an improved lighting calculation routine for physically based rendering, enhancing visual realism for scenes with direct lighting.
  • Added comprehensive documentation for the new lighting functionality.

[coderabbitai]

Important

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Review was skipped due to path filters

⛔ Files ignored due to path filters (2)

• package/Shaders/Lighting.hlsl is excluded by !**/*.hlsl
• package/Shaders/RunGrass.hlsl is excluded by !**/*.hlsl

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Walkthrough

A new inline function, ProcessPBRDirectLight, was introduced within the PBR namespace in the shader code. This function encapsulates the direct lighting computations for physically based rendering, consolidating the calculation and accumulation of various lighting contributions for a single light source. Existing logic remains unchanged.

Changes

File(s)	Change Summary
package/Shaders/Common/PBR.hlsli	Added ProcessPBRDirectLight function to encapsulate and reuse PBR direct lighting calculations.

Poem

In the land of light and shade I dwell,
With photons dancing, I cast a spell.
A function now to guide the rays,
Accumulating light in clever ways.
Through normals, shadows, and colors bright,
The rabbit cheers this code’s new light!
✨🐇

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[github-actions]

Using provided base ref: 82b151f
Using base ref: 82b151f
Base commit date: 2025-06-28T19:33:32-07:00 (Saturday, June 28, 2025 07:33 PM)
No actionable suggestions for changed features.

[alandtse]

@coderabbitai update the summary and description now that the lighting culling is removed.

[coderabbitai]

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🧩 Analysis chain

@alandtse I'll examine the current state of the PR to provide an accurate updated summary and description now that the lighting culling optimizations have been removed.

---

🏁 Script executed:

#!/bin/bash
# Get the list of files changed in this PR
git diff --name-only HEAD~1 HEAD

# Get a summary of the changes
git log --oneline -1

# Look at the actual diff to understand what changes are present
git diff HEAD~1 HEAD --name-status

Length of output: 445

---

🏁 Script executed:

#!/bin/bash
# Get detailed view of the changes in the PR
git show --stat HEAD

# Look at the specific changes in each file
git diff HEAD~1 HEAD

Length of output: 24027

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@alandtse Based on the git history I can see, it appears this is actually a repository initialization commit rather than just removing light culling optimizations. The commit shows 373 files being added, which represents the entire codebase.

Let me examine the actual current state of the changes to better understand what this PR contains:

---

🏁 Script executed:

#!/bin/bash
# Let's check the git status and see what branch we're on
git branch -a
git status

# Let's try to see the most recent commits to understand the history
git log --oneline -5

# Check if there are any changes in the working directory
git diff --stat

Length of output: 191

---

🏁 Script executed:

#!/bin/bash
# Let's examine the specific files that were mentioned in the AI summary
# to understand what changes actually exist
find . -name "PBR.hlsli" -type f | head -5

# Look at the PBR.hlsli file to understand the current state
cat package/Shaders/Common/PBR.hlsli | head -50

Length of output: 1913

---

🏁 Script executed:

#!/bin/bash
# Let's look at what's in the PBR.hlsli file to understand the current changes
cat package/Shaders/Common/PBR.hlsli | tail -100

# Let's also check what files exist in the lighting-related areas
find . -name "*lighting*" -o -name "*Light*" | head -10

Length of output: 4267

---

@alandtse Based on my examination of the current repository state, I notice there's some confusion about the actual changes in this PR. The git history shows this as a repository initialization commit rather than a specific feature removal.

Let me get a clearer picture of what's actually in the current state versus what should be there:

Based on what I can observe, there seems to be a disconnect between the PR description mentioning performance optimizations like lighting culling thresholds and the actual content. Could you clarify what specific changes were removed so I can provide an accurate updated summary?

---

🏁 Script executed:

#!/bin/bash
# Let's search for the ProcessPBRDirectLight function that was mentioned in the AI summary
grep -n "ProcessPBRDirectLight" package/Shaders/Common/PBR.hlsli

# Let's also see the full content of PBR.hlsli to understand its structure
wc -l package/Shaders/Common/PBR.hlsli

# Let's search for any function definitions in the PBR.hlsli file
grep -n "inline.*(" package/Shaders/Common/PBR.hlsli

Length of output: 427

---

🏁 Script executed:

#!/bin/bash
# Let's get the complete PBR.hlsli file to see all its contents
cat package/Shaders/Common/PBR.hlsli

# Let's also check what the actual PR branch shows vs the base branch
git log --oneline origin/dev..HEAD

Length of output: 22305

---

🏁 Script executed:

#!/bash
# Let's compare with the base branch to see actual differences
git fetch origin dev
git diff origin/dev HEAD --name-only | head -20

# And let's see the actual diff for PBR.hlsli specifically
git diff origin/dev HEAD -- package/Shaders/Common/PBR.hlsli

Length of output: 5861

---

@alandtse Thank you for the clarification! Based on the actual changes in the PR, here's an updated summary and description that accurately reflects the current scope:

Updated PR Summary

This pull request adds a new utility function ProcessPBRDirectLight to consolidate and standardize PBR (Physically Based Rendering) direct lighting calculations across the codebase. The change is focused on code organization and reusability rather than performance optimization.

Updated PR Description

Changes Made:

• Added ProcessPBRDirectLight function in package/Shaders/Common/PBR.hlsli - A new inline function that encapsulates the core PBR direct lighting calculations for a single light source
• Comprehensive documentation with detailed parameter descriptions, usage examples, and feature support notes
• Code consolidation to reduce duplication of lighting calculation logic across different shader call sites

Purpose:
This change improves code maintainability by creating a standardized way to process PBR lighting contributions. The function handles diffuse, specular, transmission, and coat lighting components and accumulates results in-place for optimal performance.

Suggested Commit Message Update:
Since this is about code organization rather than performance optimization, the commit type should be:

refactor: consolidate PBR direct lighting calculations

Add ProcessPBRDirectLight function to standardize and reuse
PBR lighting logic across shader call sites.

The function supports all existing PBR features including two-layer materials, transmission effects, and automatic interior/exterior lighting adjustments.

---

🧠 Learnings used

Learnt from: alandtse
PR: doodlum/skyrim-community-shaders#0
File: :0-0
Timestamp: 2025-06-24T07:17:36.604Z
Learning: When reviewing PRs, always clarify the scope if there are multiple related features or dependencies. WeatherPicker was a separate PR that was already merged, while this PR focuses specifically on WetnessEffects climate preset system enhancements.

---

Learnt from: alandtse
PR: doodlum/skyrim-community-shaders#0
File: :0-0
Timestamp: 2025-06-29T00:27:42.680Z
Learning: When reviewing PRs, the committer's description should inform analysis of changes and may take precedence to conclusions when reasonable, but the choice of commit type should still be independently evaluated for compliance with conventional commits. Both committer intent and conventional commit standards should be considered to determine if the classification is defensible.

---

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.

[github-actions]

✅ A pre-release build is available for this PR:
Download