coated textures in snow area only

[Noa3]

Add snow-only mode for coated textures

Adds COATED_TEXTURES_SNOW_ONLY option that restricts coated texture overlay to snowy biomes, using the existing inSnowy uniform for smooth biome-based transitions.

• shaders/lib/common.glsl: New //#define COATED_TEXTURES_SNOW_ONLY (off by default)
• shaders/lib/materials/materialMethods/coatedTextures.glsl: Early-out and noiseFactor scaling gated on inSnowy:

  #ifdef COATED_TEXTURES_SNOW_ONLY
      if (inSnowy < 0.001) return;
      noiseFactor *= inSnowy;
  #endif

• shaders/shaders.properties: Added to IPBR_SETTINGS menu alongside COATED_TEXTURES
• shaders/lang/en_US.lang: Option label and tooltip

[Copilot]

Pull request overview

Adds an optional “snow-only” mode for coated texture overlays, limiting the effect to snowy biomes via the existing inSnowy uniform (with smooth transitions).

Changes:

• Introduces COATED_TEXTURES_SNOW_ONLY (off by default) as a new shader define.
• Gates coated texture application (early-out + intensity scaling) based on inSnowy.
• Exposes the toggle in the shader options UI and adds English label/tooltip text.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
shaders/shaders.properties	Adds COATED_TEXTURES_SNOW_ONLY to the IPBR settings menu so users can toggle it.
shaders/lib/materials/materialMethods/coatedTextures.glsl	Applies snow-only gating using inSnowy (early return + noiseFactor scaling).
shaders/lib/common.glsl	Declares the new optional define (commented out by default).
shaders/lang/en_US.lang	Adds user-facing option label and tooltip for the new toggle.

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[Copilot]

The tooltip says “snowy biomes or areas with snowfall”, but the implementation uses the inSnowy uniform which is derived from biome_precipitation == 2 (snow precipitation type). That corresponds to snowy biomes, not necessarily places where it is currently snowing / can snow due to local temperature/altitude. Consider rewording the tooltip to match the actual behavior (e.g., “biomes with snow precipitation”).

Suggested change

	option.COATED_TEXTURES_SNOW_ONLY.comment=When enabled, coated textures only appear in snowy biomes or areas with snowfall. §e[*]§r Requires Coated Textures to be enabled.
	option.COATED_TEXTURES_SNOW_ONLY.comment=When enabled, coated textures only appear in biomes with snow precipitation. §e[*]§r Requires Coated Textures to be enabled.