Module flow_codegen 

FlowGraph → WGSL code generation

Compiles @flow DAG blocks from CSS into executable WGSL shader modules. Supports both fragment (rendering) and compute (simulation) targets.

The codegen pipeline:

1. Collect which helper functions are needed (SDF, noise, etc.)
2. Emit uniform/binding declarations
3. Emit only the used helper functions
4. Emit vertex shader (for fragment flows)
5. Emit entry point with node computations in topological order

Functions

flow_needs_scene_texture

Check if a flow graph uses the sample_scene() function, which requires binding a scene texture to the pipeline.

flow_to_wgsl

Compile a validated FlowGraph into a complete WGSL module string.