无法从 OpenGL 3.2 / 3.3 检索版本信息
我遵循了这里的基本说明：
我唯一调整的是创建 3.2 或3.3：
const int attributes[] =
{
WGL_CONTEXT_MAJOR_VERSION_ARB, 3,
WGL_CONTEXT_MINOR_VERSION_ARB, 2,
WGL_CONTEXT_FLAGS_ARB, WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
0
};
然后在创建上下文（成功返回 TRUE）之后，我检查版本：
// Double check the version (old way)
const GLubyte *const pszGLVersion = glGetString(GL_VERSION);
// Double check the version (new way)
GLint glVersion[2];
glGetIntegerv(GL_MAJOR_VERSION, &glVersion[0]);
glGetIntegerv(GL_MINOR_VERSION, &glVersion[1]);
但是，pszGLVersion 为 NULL，并且 glVersion[0] 和 glVersion[1] 都未初始化！
为什么创建 OpenGL 3.2 & 3.3 context成功，但是获取版本信息失败？
I've followed the basic instructions here:
The only thing I've tweaked is the creation of the context to be 3.2 or 3.3:
const int attributes[] =
{
WGL_CONTEXT_MAJOR_VERSION_ARB, 3,
WGL_CONTEXT_MINOR_VERSION_ARB, 2,
WGL_CONTEXT_FLAGS_ARB, WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
0
};
And then after the creation of the context (which returns TRUE for success) I check the version with:
// Double check the version (old way)
const GLubyte *const pszGLVersion = glGetString(GL_VERSION);
// Double check the version (new way)
GLint glVersion[2];
glGetIntegerv(GL_MAJOR_VERSION, &glVersion[0]);
glGetIntegerv(GL_MINOR_VERSION, &glVersion[1]);
However, pszGLVersion is NULL, and glVersion[0] and glVersion[1] are both left uninitialised!
Why does the creation of an OpenGL 3.2 & 3.3 context succeed, but then fail to get version information?
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您是否将上下文设置为当前上下文？您会注意到，
glGetString不采用上下文参数，它适用于当前上下文。在调用wglMakeCurrent之前您无法使用它，默认情况下新创建的上下文不会成为当前上下文。Did you make the context current? You'll note that
glGetStringdoesn't take a context parameter, it works on the current context. You can't use it until after you callwglMakeCurrent, a newly created context is not made current by default.我认为我无法获取版本信息的原因是因为我的显卡不支持3.2或3.3。
I think the reason I can't get the version information out is because my graphics card doesn't support 3.2 or 3.3.