glGetString - return a string describing the current GL
const GLubyte * glGetString(
GLenum name );
Specifies a symbolic constant, one of GL_VENDOR, GL_RENDERER,
GL_VERSION, or GL_EXTENSIONS.
glGetString() returns a pointer to a static string
describing some aspect of the current GL connection. name
can be one of the following: Returns the company responsible
for this GL implementation. This name does not change
from release to release. Returns the name of the renderer.
This name is typically specific to a particular
configuration of a hardware platform. It does not change
from release to release. Returns a version or release
number. Returns a space-separated list of supported
extensions to GL.
Because the GL does not include queries for the performance
characteristics of an implementation, some applications
are written to recognize known platforms and modify
their GL usage based on known performance characteristics
of these platforms. Strings GL_VENDOR and GL_RENDERER
together uniquely specify a platform. They do not change
from release to release and should be used by platformrecognition
Some applications want to make use of features that are
not part of the standard GL. These features may be implemented
as extensions to the standard GL. The GL_EXTENSIONS
string is a space-separated list of supported GL extensions.
(Extension names never contain a space character.)
The GL_VERSION string begins with a version number. The
version number uses one of these forms:
Vendor-specific information may follow the version number.
Its depends on the implementation, but a space always
separates the version number and the vendor-specific
All strings are null-terminated.
If an error is generated, glGetString() returns 0.
The client and server may support different versions or
extensions. glGetString() always returns a compatible
version number or list of extensions. The release number
always describes the server.
GL_INVALID_ENUM is generated if name is not an accepted
GL_INVALID_OPERATION is generated if glGetString() is executed
between the execution of glBegin() and the corresponding
execution of glEnd().
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