Take screenshot and use it as texture using ScreenCapture

Question

I need to take screenshot and hold it in memory so later I can serialise it in save file with all the other information I need to save. We're using Unity 2019.3.0a8 and as documentation says for taking screenshots there is class ScreenCapture for which I wasn't able to find any information except for Unity Scripting API. So I have two questions.

First, as documentation says I need to wait till the end of frame rendering and the proper way of doing so is (taken from ScreenCapture.CaptureScreenshotAsTexture)

IEnumerator TakeScreenshot() { yield return new WaitForEndOfFrame(); var texture = ScreenCapture.CaptureScreenshotAsTexture(); // do something with texture // cleanup Object.Destroy(texture); }

However if I'm using yield return, I can't have neither return value for the method nor ref parameter thus I can't use the screenshot inside the method in which I call StartCoroutine(TakeScreenshot());. I was thinking of using async/await but it allows me to wait only for some amount of seconds and not exactly till the end of frame. How can I wait for end of frame rendering without using yield?

Second question here.

Answer 1

Best Answer

Answer by kala-hari · Jul 17, 2019 at 06:53 PM

One way to solve the issue with returning values from Coroutines is passing a Callback to the Coroutine method.

The Callback can be called after the screenshot is taken, and receive the result as a Parameter.

For example:

  void HandleScreenshot()
  {
      StartCoroutine(TakeScreenshot((result) => {
          FurtherProcessing(result);
      });
  
  }
  
  IEnumerator TakeScreenShot(System.Action<ResultType> callback)
  {
      yield return new WaitForEndOfFrame();
      var result = new ResultType(ScreenCapture.CaptureScreenshotAsTexture());
      callback(result);
  }

Don't forget to destroy the texture aftwards.

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Dheinamar · Jul 28, 2019 at 01:29 PM 0

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I've just added all further processing into TakeScreenshot. I just don't know why didn't I do this in first place. Anyway, thank you for the help.

kala-hari · Jul 29, 2019 at 07:42 AM 0

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Glad I could help :)

Answer 2

Answer by WookieWookie · May 06 at 08:49 PM

I get this error that is a known bug but only has 2 upvotes:

Metal: GrabIntoRenderTexture mismatched grab pass: 80 / 70

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Take screenshot and use it as texture using ScreenCapture

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