Allow mods using the Veil rendering engine (such as Create: Aeronautics) to render correctly when using Iris shaderpacks.
Veil is an advanced rendering SDK for Minecraft mods — it provides a shader infrastructure that other mods can build on. The most prominent consumer is Create: Aeronautics, which uses Veil for its airplane wings, glass panels, contrails, and other visual effects.
The problem: when you enable a shaderpack via Iris, Veil-rendered visuals bypass the shaderpack's pipeline entirely, causing them to appear broken or missing.
This mod automatically merges Veil shader code into the shaderpack's gbuffer programs at runtime, so Veil-based visuals (like Aeronautics planes) integrate seamlessly with your shaderpack.
This mod intercepts Veil's shader compilation via mixins, capturing and caching the processed shader source. At render time, it injects Veil shader logic into the shaderpack's gbuffer vertex/fragment programs using AST-level patching (powered by glsl-transformer), and creates an Iris ShaderInstance to replace the original Veil shader.
The cache is automatically invalidated when you switch or reload shaderpacks — no restart needed.
This project uses glsl-transformer for shader AST manipulation.
