glGetString(GL_VERSION)会获得哪个版本? [英] Which version does glGetString(GL_VERSION) get?

问题描述

glGetString(GL_VERSION)是否获得系统的最大支持版本或当前上下文的版本?

Does glGetString(GL_VERSION) get the maximum supported version for your system, or the version for your current context?

我知道您需要创建一个上下文才能使glGetString()工作，所以这使我想知道它是当前上下文还是可用的最高上下文.

I know that you need to create a context in order for glGetString() to work, so that is what made me wonder if it was the current context or the highest available.

推荐答案

摘自规范(从3.3规范文档复制):

From the spec (copied from 3.3 spec document):

字符串查询返回指向UTF-8编码，以NULL终止的静态字符串的指针，这些字符串描述了当前GL上下文的属性.

String queries return pointers to UTF-8 encoded, NULL-terminated static strings describing properties of the current GL context.

所以它是当前上下文支持的版本.如果您在客户端/服务器设置中进行操作，则有一个微妙的方面:

So it's the version supported by the current context. There's a subtle aspect if you're operating in a client/server setup:

GetString返回当前GL上下文可以支持的版本号(在VERSION字符串中).因此，如果客户端和服务器支持不同的版本，则会返回兼容版本.

GetString returns the version number (in the VERSION string) that can be supported by the current GL context. Thus, if the client and server support different versions a compatible version is returned.

按照我的理解，如果两个版本不同，它将返回客户端和服务器之间的最小值.

The way I read this, it will return the minimum between the client and server if the two versions are different.

使用glGetIntegerv()检查版本通常更容易.这样，您不必开始解析字符串，还可以获取其他详细信息:

It's generally easier to use glGetIntegerv() to check the version. This way, you don't have to start parsing strings, and you can also get additional detail:

GLint majVers = 0, minVers = 0, profile = 0, flags = 0;
glGetIntegerv(GL_MAJOR_VERSION, &majVers);
glGetIntegerv(GL_MINOR_VERSION, &minVers);
glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &profile);
glGetIntegerv(GL_CONTEXT_FLAGS, &flags);

if (profile & GL_CONTEXT_CORE_PROFILE_BIT) {
    ...
}

if (profile & GL_CONTEXT_COMPATIBILITY_PROFILE_BIT) {
    ...
}

if (flags & GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT) {
    ...
}

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