iPhone:在 UIView 之上分层透明的 openGL 视图? [英] iPhone: Layering a transparent openGL view on top of a UIView?

问题描述

我正在开发 iPhone 应用程序，并且在常规 UIView 之上有一个 openGL 视图渲染.它正在工作，但我似乎无法让 openGL 视图具有显示下方 UIView 的透明背景.相反，我得到了一个大黑匣子.

I am working on iPhone app and I have an openGL view rendering on top of a regular UIView. It's working, but I can't seem to get the openGL view to have a transparent background that shows the UIView underneath. Instead, I get a big black box.

我已经尝试将背景颜色设置为 UIColor clearColor，我已将 opaque 设置为 NO，我已将 glClearColor 设置为 0.0,0.0,0.0,0.0.

I have tried setting the background color to UIColor clearColor, I've set opaque to NO, I've set glClearColor to 0.0,0.0,0.0,0.0.

我认为我误解/误用了与混合模式相关的内容，但我不确定.谁能给我一些示例代码来展示如何做到这一点?

I think I'm misunderstanding/misusing something related to blend modes, but I'm not sure. Can anyone give me a bit of sample code which shows how to do this?

提前致谢.

推荐答案

这是我必须做的事情才能让它发挥作用:

Here's what I had to do to get this to work:

eaglLayer.opaque = NO;      
eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
                                kEAGLColorFormatRGBA8, kEAGLDrawablePropertyColorFormat, nil];
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

如果你正在做我正在做的事情并试图用 GLGravity 演示来测试它，还有另一个调用 glClearColor(0.0f, 0.0f, 0.0f, 1.0f);每次 drawView 被调用时——所以确保你也将它更改为 glClearColor(0.0f, 0.0f, 0.0f, 0.0f);！:)

And incase you're doing what I was doing and are trying to test it with the GLGravity demo, there's another call to glClearColor(0.0f, 0.0f, 0.0f, 1.0f); every time drawView is called -- so make sure you change that one to glClearColor(0.0f, 0.0f, 0.0f, 0.0f); too! :)

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