控制FPS限制在OpenGL应用程序 [英] controlling FPS limit in OpenGL application

问题描述

我试图找到能够设置我到底有多少FPS希望我的OpenGL应用程序在屏幕上显示一个坚实的方法。我可以睡1000 / FPS毫秒它做在一定程度上，但是这并没有考虑到渲染所需的时间。 这是最一致的方式来限制FPS到所需的量？

I am trying to find a solid method for being able to set exactly how many FPS I want my OpenGL application to render on screen. I can do it to some extent by sleeping for 1000/fps milliseconds but that doesn't take into account the time needed to render. Which is the most consistent way to limit fps to desired amount?

推荐答案

您可以通过同步在OpenGL中使用wglSwapIntervalEXT到VBLANK。它不是很好code，但它的工作。

you can sync to vblank by using wglSwapIntervalEXT in opengl. its not nice code, but it does work.

<一个href="http://www.gamedev.net/topic/360862-wglswapintervalext/#entry3371062">http://www.gamedev.net/topic/360862-wglswapintervalext/#entry3371062

bool WGLExtensionSupported(const char *extension_name) {
    PFNWGLGETEXTENSIONSSTRINGEXTPROC _wglGetExtensionsStringEXT = NULL;

    _wglGetExtensionsStringEXT = (PFNWGLGETEXTENSIONSSTRINGEXTPROC)wglGetProcAddress("wglGetExtensionsStringEXT");

    if (strstr(_wglGetExtensionsStringEXT(), extension_name) == NULL) {
        return false;
    }

    return true;
}

和

PFNWGLSWAPINTERVALEXTPROC       wglSwapIntervalEXT = NULL;
PFNWGLGETSWAPINTERVALEXTPROC    wglGetSwapIntervalEXT = NULL;

if (WGLExtensionSupported("WGL_EXT_swap_control"))
{
// Extension is supported, init pointers.
    wglSwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC)wglGetProcAddress("wglSwapIntervalEXT");

// this is another function from WGL_EXT_swap_control extension
    wglGetSwapIntervalEXT = (PFNWGLGETSWAPINTERVALEXTPROC)wglGetProcAddress("wglGetSwapIntervalEXT");
}

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