Question

我在游戏中添加了一个分析器并隔离了这个功能。它有时会导致FPS下降。这是我的结果：

Present buffer time: 22
Present buffer time: 1
Present buffer time: 9
Present buffer time: 1
Present buffer time: 20
Present buffer time: 6
Present buffer time: 4
Present buffer time: 4
Present buffer time: 22
Present buffer time: 4
Present buffer time: 8
Present buffer time: 4
Present buffer time: 4
Present buffer time: 15
Present buffer time: 1
Present buffer time: 1
Present buffer time: 1
Present buffer time: 11
Present buffer time: 1
Present buffer time: 6
Present buffer time: 1
Present buffer time: 1
Present buffer time: 25
Present buffer time: 6
Present buffer time: 7
Present buffer time: 1
Present buffer time: 10
Present buffer time: 7
Present buffer time: 3
Present buffer time: 1
Present buffer time: 12
Present buffer time: 9
Present buffer time: 6
Present buffer time: 9

你知道为什么每隔几帧这个功能需要更多的时间吗？

这是我的代码：


    f64 time = -System::GetTime();      
    [m_context presentRenderbuffer:GL_RENDERBUFFER_OES];
    Log("Present buffer time: %d\n", u32((System::GetTime() + time) * 1000.));

Answer 1

如果没有显式调用glFlush()，则在呈现缓冲区时强制驱动程序执行此操作，因为在presentRenderbuffer调用时，缓冲区上的呈现操作可能尚未完成

在呈现缓冲区并分别测量它的时间之前，请尝试调用glFlush。

Answer 2

实际进入显示器的渲染缓冲器演示可以被量化为30Hz或60Hz刷新率。快速渲染实际上可能只是在前一个渲染完成之前丢弃了之前的渲染。

presentRenderbuffer：GL_RENDERBUFFER_OES需要很长时间

2 个答案: