SceneRenderer 中的 Kotlin 内联函数

Question

如果在渲染循环中使用内联函数，是否会有任何性能优势？

class SceneRenderer(val f: () -> Unit): GLSurfaceView.Renderer {
  override fun onSurfaceCreated(glUnused: GL10, config: EGLConfig) { ... }

  override fun onSurfaceChanged(glUnused: GL10, width: Int, height: Int) { ... }

  override fun onDrawFrame(glUnused: GL10) {
    ...
    inlineFun(f)
    ...
  }

  private inline fun inlineFun(f: () -> Unit) {
    f.invoke()
  }
}

还是直接调用函数就够了？

override fun onDrawFrame(glUnused: GL10) {
  ...
  f.invoke()
  ...
}

提前致谢！

Answer 1

TL;DR

Or is it enough to use a direct function call?

是的，是的。

内联

Kotlinlang:

Using higher-order functions imposes certain runtime penalties: each function is an object, and it captures a closure, i.e. those variables that are accessed in the body of the function. Memory allocations (both for function objects and classes) and virtual calls introduce runtime overhead.

您的函数不是高阶函数，因为它在 class SceneRenderer 内部，因此不会对 inline.

产生任何合理影响

Inlining may cause the generated code to grow; however, if we do it in a reasonable way (i.e. avoiding inlining large functions), it will pay off in performance, especially at "megamorphic" call-sites inside loops.

SceneRenderer 中的 Kotlin 内联函数

Kotlin Inline function in SceneRenderer

android

kotlin

opengl-es

TL;DR

内联