Module sdf_batch 

SDF-aware instanced glyph batch rendering.

Adapts the existing GlyphInstance / GlyphBatcher approach for SDF rendering:

• Same VBO/instance layout, but rendered with sdf_glyph.frag
• Automatic smoothing calculation based on glyph screen-space size
• Scale-dependent threshold for consistent edge quality at all sizes
• Per-glyph SDF effects (outline, shadow, glow, bold, wave, glitch)

Structs

PendingSdfGlyph

Pending SDF glyph submission.

SdfBatchStats

SdfBatchUniforms

Uniforms that are set once per SDF draw call (not per-instance).

SdfGlyphBatch

A batch of SDF glyph instances ready for rendering.

SdfGlyphBatcher

Builds and sorts SDF glyph batches each frame.

SdfInstanceExtra

Per-instance SDF-specific data that supplements the base GlyphInstance.

Functions

layout_sdf_text

Lay out a string of text using the SDF atlas metrics and return GlyphInstance

layout_sdf_text_with_effects

Lay out text with SDF effects applied.