compile static method

Implementation

static Program compile(
  RenderingContext gl, {
  required String vertexSource,
  required String fragmentSource,
  Map<String, String> defines = const {},
  Map<String, int> attribBindings = const {},
}) {
  final vsText = _injectDefines(vertexSource, defines);
  final fsText = _injectDefines(fragmentSource, defines);

  final vs = gl.createShader(WebGL.VERTEX_SHADER);
  gl
    ..shaderSource(vs, vsText)
    ..compileShader(vs); // throws with info log on failure

  final fs = gl.createShader(WebGL.FRAGMENT_SHADER);
  gl
    ..shaderSource(fs, fsText)
    ..compileShader(fs);

  final program = gl.createProgram();

  // Attach shaders, bind attributes (stable locations), then link.
  gl
    ..attachShader(program, vs)
    ..attachShader(program, fs);

  if (attribBindings.isNotEmpty) {
    attribBindings.forEach((name, index) {
      gl.bindAttribLocation(program, index, name);
    });
  }

  gl
    ..linkProgram(program)

    // Shaders no longer needed after a successful link.
    ..deleteShader(vs)
    ..deleteShader(fs);

  return program;
}