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name: latitude-rendering-compat-rules description: Rendering rules for Sodium/Iris compatibility in Latitude (E/W storm walls, fog, overlays). Forbids raw GL state, mandates entry-based vertex emission, approved RenderLayers, and shader-safe debugging patterns.

Latitude — Rendering Compatibility Rules (Authoritative)

This skill applies to:

• E/W storm wall rendering
• custom fog overlays
• any world-space debug geometry
• any rendering that must work with Sodium + Iris

Goal: avoid “works vanilla, breaks with shaders” regressions.

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Non-negotiable rules

1. No direct GL state calls in mod render code:

• No RenderSystem.* state toggles
• No GL11.*
• No manual blend/depth toggles

2. Always use modern vertex emission:

• VertexConsumer with MatrixStack.Entry
• prefer built-in RenderLayers / RenderLayers helpers
• never rely on “implicit” GL state being correct

3. Rendering must be safe under:

• Fabric renderer
• Sodium renderer
• Iris shader pipeline

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Approved rendering approaches

A) World-space geometry (storm wall)

• Subscribe via the proper world render callback (not HUD)
• Use WorldRenderContext matrices/consumers
• Emit vertices using vertex(entry, x,y,z).color(...).texture(...).light(...).normal(...);
• Keep geometry stable and avoid Z-fighting (slight inset if needed)

B) Debug lines/quads

• Provide a compile-time or JVM-toggle to swap geometry:
  • line-only layer for shader visibility testing
  • quad layer for final

All debug visuals must be behind a toggle and off by default.

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Debug toggles (recommended)

• -Dlatitude.debugRenderEwWall=true
• -Dlatitude.debugEwWallLines=true (lines vs quads)
• -Dlatitude.debugFog=true

Default OFF.

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Performance / safety constraints

• Avoid per-frame allocations in hot render paths.
• Avoid extremely dense geometry; scale step size with distance if needed.
• Never spam actionbar logs; use one-shot logs or counters.

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Required assistant procedure for render bugs

When a render bug is reported (“not visible with shaders”, “flicker”, etc.), the assistant must:

1. Identify the current RenderLayer and emission style
2. Switch to a minimal debug layer (lines) behind a toggle
3. Confirm callback is firing (single-shot ping)
4. Reduce z-fighting (slight inset, depth tweaks via layer choice only)
5. Only then adjust final geometry/layer

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Forbidden behaviors

• “Just disable shaders” as a solution
• Adding render fixes by toggling GL state directly
• Shipping with debug render toggles enabled by default