如何在OpenGL中截取屏幕截图

How to take screenshot in OpenGL(如何在OpenGL中截取屏幕截图)
本文介绍了如何在OpenGL中截取屏幕截图的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

问题描述

如何在 C++ 中截取 OpenGL 窗口的屏幕截图并将其保存到文件中.

How to take a screenshot of an OpenGL window in C++ and save it to file.

我找到了 glReadPixels() 功能,但我不知道接下来要做什么.例如,我可以在哪里设置文件路径?

I found the glReadPixels() function, but I don't know what to do next. Where I can set path to a file, for example?

如果不难,请写代码.

推荐答案

这段代码捕获 OpenGL 窗口并导出到 BMP 文件.您必须有 FreeImage 库才能运行它.

This piece of code captures the OpenGL window and export to a BMP file. You must have FreeImage library to run it.

// Make the BYTE array, factor of 3 because it's RBG.
BYTE* pixels = new BYTE[3 * width * height];

glReadPixels(0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, pixels);

// Convert to FreeImage format & save to file
FIBITMAP* image = FreeImage_ConvertFromRawBits(pixels, width, height, 3 * width, 24, 0x0000FF, 0xFF0000, 0x00FF00, false);
FreeImage_Save(FIF_BMP, image, "C:/test.bmp", 0);

// Free resources
FreeImage_Unload(image);
delete [] pixels;

这篇关于如何在OpenGL中截取屏幕截图的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

本站部分内容来源互联网,如果有图片或者内容侵犯了您的权益,请联系我们,我们会在确认后第一时间进行删除!

相关文档推荐

Prevent class inheritance in C++(防止 C++ 中的类继承)
Why should I declare a virtual destructor for an abstract class in C++?(为什么要在 C++ 中为抽象类声明虚拟析构函数?)
Why is Default constructor called in virtual inheritance?(为什么在虚拟继承中调用默认构造函数?)
C++ cast to derived class(C++ 转换为派生类)
C++ virtual function return type(C++虚函数返回类型)
Is there any real risk to deriving from the C++ STL containers?(从 C++ STL 容器派生是否有任何真正的风险?)