WaitForEndOfFrame

描述

等待，直到该帧结束，在渲染所有摄像机和 GUI 之后，在屏幕上显示该帧之前。

You can use it to read the display into a texture, encode it as an image file (see Texture2D.ReadPixels and Texture2D.EncodeToPNG) and send it somewhere. Switching from the Game view to the Scene view will cause WaitForEndOfFrame to freeze. It will only continue when the application is switched back to the Game view. This can only happen when the application is working in the Unity editor.

注意：在批处理模式下，不会在编辑器上调用此协程。如需了解更多详细信息，请参阅手册中的命令行参数页面。

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    IEnumerator Example() {
        yield return new WaitForEndOfFrame();
    }
}

另一个示例：

using System.IO;
using UnityEngine;
using UnityEngine.Networking;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    // Take a shot immediately
    IEnumerator Start()
    {
        UploadPNG();
        yield return null;
    }

    IEnumerator UploadPNG()
    {
        // We should only read the screen buffer after rendering is complete
        yield return new WaitForEndOfFrame();

        // Create a texture the size of the screen, RGB24 format
        int width = Screen.width;
        int height = Screen.height;
        Texture2D tex = new Texture2D(width, height, TextureFormat.RGB24, false);

        // Read screen contents into the texture
        tex.ReadPixels(new Rect(0, 0, width, height), 0, 0);
        tex.Apply();

        // Encode texture into PNG
        byte[] bytes = tex.EncodeToPNG();
        Destroy(tex);

        // For testing purposes, also write to a file in the project folder
        // File.WriteAllBytes(Application.dataPath + "/../SavedScreen.png", bytes);


        // Create a Web Form
        WWWForm form = new WWWForm();
        form.AddField("frameCount", Time.frameCount.ToString());
        form.AddBinaryData("fileUpload", bytes);

        // Upload to a cgi script
        var w = UnityWebRequest.Post("http://localhost/cgi-bin/env.cgi?post", form);
        yield return w.SendWebRequest();
        if (w.isNetworkError || w.isHttpError)
            print(w.error);
        else
            print("Finished Uploading Screenshot");
        yield return null;
    }
}

using UnityEngine;
using System.Collections;

public class ExampleScript : MonoBehaviour
{
    // A script that shows destination alpha channel in the game view.

    Material mat;

    void CreateMaterial()
    {
        // Unity has a built-in shader that is useful for drawing
        // simple colored things. In this case, we just want to use
        // a blend mode that inverts destination colors.
        var shader = Shader.Find("Hidden/Internal-Colored");
        mat = new Material(shader);
        mat.hideFlags = HideFlags.HideAndDontSave;
        // Set blend mode to show destination alpha channel.
        mat.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.DstAlpha);
        mat.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);
        // Turn off backface culling, depth writes, depth test.
        mat.SetInt("_Cull", (int)UnityEngine.Rendering.CullMode.Off);
        mat.SetInt("_ZWrite", 0);
        mat.SetInt("_ZTest", (int)UnityEngine.Rendering.CompareFunction.Always);
    }

    public IEnumerator Start()
    {
        CreateMaterial();
        while (true)
        {
            // Wait until all rendering + UI is done.
            yield return new WaitForEndOfFrame();
            // Draw a quad that shows alpha channel.
            GL.PushMatrix();
            GL.LoadOrtho();
            mat.SetPass(0);
            GL.Begin(GL.QUADS);
            GL.Vertex3(0, 0, 0);
            GL.Vertex3(1, 0, 0);
            GL.Vertex3(1, 1, 0);
            GL.Vertex3(0, 1, 0);
            GL.End();
            GL.PopMatrix();
        }
        yield return null;
    }
}

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