flutter3d_build_hooks

What a package's own build hook needs to compile its flutter3d materials, and nothing else.

A material written in the material language (*.f3dmat) is compiled ahead of time into one shader bundle that every GPU backend loads: impellerc's output for Impeller, GLSL ES 3.00 for WebGL2, and WGSL for WebGPU when glslangValidator and naga are on PATH. A build hook runs for every application that depends on its package, so whatever the hook imports is resolved into every game. That is why this is a package of its own: flutter3d_build is the converter and the flutter3d command, and brings the MCP servers with it; a hook that compiles one material needs none of that.

Name	What it is
`compileMaterial`	One material source as a `ShaderBundle`, compiled for every backend the compilers can serve
`MaterialCompilers`	The programs a build runs; `locate()` finds them in the Flutter SDK running the hook
`generateMaterialAccessors`	The typed accessors a package commits beside its materials
`MaterialBuildException`	A material that did not build, with the source, line and column

flutter3d_build exports all four, so a project whose hook already depends on it sees the same names.

Example

// hook/build.dart
import 'dart:io';

import 'package:flutter3d_build_hooks/flutter3d_build_hooks.dart';
import 'package:flutter3d_shaders/compile.dart';
import 'package:hooks/hooks.dart';

void main(List<String> arguments) async {
  await build(arguments, (input, output) async {
    final root = Directory.fromUri(input.packageRoot);
    final source = File('${root.path}/assets_src/water.f3dmat');
    final scratch = Directory.systemTemp.createTempSync('f3dmat');
    try {
      final bundle = compileMaterial(
        source.readAsStringSync(),
        source: source.path,
        engine: loadShaders(from: root.path),
        compilers: MaterialCompilers.locate(),
        scratch: scratch,
      );
      File('${root.path}/assets/water.f3dshaders')
          .writeAsBytesSync(bundle.encode().buffer.asUint8List());
    } on MaterialBuildException catch (error) {
      throw BuildError(message: '$error');
    } finally {
      scratch.deleteSync(recursive: true);
    }
    output.dependencies.add(source.absolute.uri);
  });
}

flutter3d_build_hooks

Example

Libraries

flutter3d_build_hooks package