fix(vol-fog): missing define

[SkrubbySkrubInAShrub]

fixes 18 shaders failing to compile.
followup on #2466

Summary by CodeRabbit

• Chores
  • Updated shader configuration for improved rendering optimization.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: aef10f77-4490-46e7-8010-11644b7d7da1

📥 Commits

Reviewing files that changed from the base of the PR and between 7cbe43f and f80896a.

📒 Files selected for processing (1)

• package/Shaders/Sky.hlsl

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📝 Walkthrough

Walkthrough

A single preprocessor macro alias is added to Sky.hlsl under the EXP_HEIGHT_FOG feature flag, defining SampColorSampler to reference SampBaseSampler. This enables consistent sampler naming within the exponential height fog implementation.

Changes

Exponential Height Fog Shader Setup

Layer / File(s)	Summary
Sampler alias definition package/Shaders/Sky.hlsl	When EXP_HEIGHT_FOG is enabled, SampColorSampler is defined as a preprocessor macro alias to SampBaseSampler, establishing the correct sampler reference for height fog rendering.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• community-shaders/skyrim-community-shaders#2466: Both PRs modify package/Shaders/Sky.hlsl under the EXP_HEIGHT_FOG preprocessor flag to establish the height fog feature setup.

Suggested reviewers

• jiayev

Poem

A rabbit hops through shader code so bright,
With samplers aliased, just right, just right!
One line of magic, SampColorSampler shines,
Exponential fog now perfectly aligns. 🐰✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix(vol-fog): missing define' accurately describes the change: adding a missing preprocessor definition to fix shader compilation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

No actionable suggestions for changed features.