创建不带窗口的OpenGL上下文 [英] Creating OpenGL context without window

问题描述

我正在尝试找出创建无窗口OpenGL程序以进行屏幕外渲染的最简单方法.

I'm trying to figure out what is the simplest way to create a windowless OpenGL program for offscreen rendering.

当前，我使用它，到目前为止，它仍然可以正常工作:(为清楚起见，这里删除了错误检查)

Currently I use this, and it works fine so far: (error checks removed here for clarity)

BOOL create_opengl_context(){
    GLuint PixelFormat;
    static PIXELFORMATDESCRIPTOR pfd;
    hDC = GetDC(NULL);
    PixelFormat = ChoosePixelFormat(hDC, &pfd);
    SetPixelFormat(hDC, PixelFormat, &pfd);
    hRC = wglCreateContext(hDC);
    wglMakeCurrent(hDC, hRC);
}

使用起来安全吗?创建无窗口OpenGL程序的标准"方法是什么?

Is this safe to use? What is the "standard" way to create a windowless OpenGL program?

编辑:我正在使用FBO进行屏幕外渲染.

I'm using FBO for the offscreen rendering.

推荐答案

纯无窗口OpenGL的旧方法是使用PBuffer.在Windows上，这需要使用常规窗口创建中间OpenGL上下文，以获得所需的扩展功能指针.在X11/GLX上，无需费一切功夫.

The old method for purely windowless OpenGL is using a PBuffer. On Windows this requires the creation of a intermediate OpenGL context using a regular window to obtain the required extension function pointers. On X11/GLX it works without further ado.

实现屏幕外渲染的现代方法是使用常规的但隐藏的窗口，该窗口具有常规的OpenGL上下文和FBO作为渲染目标.

The modern way to implement off-screen rendering is using a regular, but hidden window with the usual OpenGL context and a FBO as render target.

最前沿但尚未得到很好支持的方法(某些嵌入式设备除外)正在使用EGL进行可绘制的创建.

The bleeding edge, and yet not very well supported method (except on certain embedded devices) is using EGL for drawable creation.

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