在Retina iPad上显示全屏CAEAGLLayer时出现问题 [英] Problems displaying full-screen CAEAGLLayer on Retina iPad

问题描述

我遇到了一些问题，无法使带有大型CAEAGLLayer的UIView正确显示.如果该帧大于某个大小(contentScaleFactor为2.0，则在任一维度上显然为768)，那么它将使用先前版本的缓冲区的变形图像进行重新绘制.

I've run into some problems getting a UIView with a large CAEAGLLayer to display properly. If the frame is above a certain size (apparently 768 in either dimension with a contentScaleFactor of 2.0), it redraws with a distorted image of previous versions of the buffer.

在Apple的GLPaint示例中很容易重现. PaintingView.m的硬编码contentScaleFactor为1.0，但是如果将其更改为2.0:

It's pretty easy to reproduce in Apple's GLPaint example. PaintingView.m has a hardcoded contentScaleFactor of 1.0, but if you change it to 2.0:

self.contentScaleFactor = 2.0;

并在Retina iPad(而不是模拟器)上运行它，绘制时会得到类似的东西:

and run it on a Retina iPad (not the simulator), you get something like this when you draw:

http://imgur.com/jPNqV

推荐答案

Orion在kEAGLDrawablePropertyRetainedBacking设置为YES的错误. .com/questions/9753230/ipad-3-opengl-bug-with-keagldrawablepropertyretainedbacking-and-retina>此问题.使用

This appears to be a bug with setting kEAGLDrawablePropertyRetainedBacking to YES on the Retina iPads, as reported by Orion in this question. Setting that to NO using

    eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
                                    [NSNumber numberWithBool:NO], kEAGLDrawablePropertyRetainedBacking, kEAGLColorFormatRGBA8, kEAGLDrawablePropertyColorFormat, nil];

删除了出现毛刺的图形，但是GLPaint依靠其保留的笔刷来支持它，因此如果这样做，它将无法正常工作.

removes the glitched drawing, but GLPaint relies on the retained backing for its brushes, so it won't work quite right if you do so.

我已对此提交了一个错误报告(rdar://11070429)，并将修改后的GLPaint用作此行为的测试应用程序.

I've filed a bug report on this (rdar://11070429), with the modified GLPaint as a test application for this behavior.

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