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 store it on a device.

NOTE: This coroutine is not invoked on the editor in batched mode. For further details please have a look at the Command line arguments page in the manual.

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;
    }
}

另请参阅：AsyncOperation、WaitForSeconds、WaitForFixedUpdate、WaitForSecondsRealtime、WaitUntil、WaitWhile。

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