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<HTML><HEAD><TITLE>SDL_GL_GetProcAddress</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="SDL Library Documentation"HREF="index.html"><LINKREL="UP"TITLE="Video"HREF="video.html"><LINKREL="PREVIOUS"TITLE="SDL_GL_LoadLibrary"HREF="sdlglloadlibrary.html"><LINKREL="NEXT"TITLE="SDL_GL_GetAttribute"HREF="sdlglgetattribute.html"></HEAD><BODYCLASS="REFENTRY"BGCOLOR="#FFF8DC"TEXT="#000000"LINK="#0000ee"VLINK="#551a8b"ALINK="#ff0000"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">SDL Library Documentation</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="sdlglloadlibrary.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="sdlglgetattribute.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><H1><ANAME="SDLGLGETPROCADDRESS"></A>SDL_GL_GetProcAddress</H1><DIVCLASS="REFNAMEDIV"><ANAME="AEN2678"></A><H2>Name</H2>SDL_GL_GetProcAddress -- Get the address of a GL function</DIV><DIVCLASS="REFSYNOPSISDIV"><ANAME="AEN2681"></A><H2>Synopsis</H2><DIVCLASS="FUNCSYNOPSIS"><ANAME="AEN2682"></A><P></P><PRECLASS="FUNCSYNOPSISINFO">#include "SDL.h"</PRE><P><CODE><CODECLASS="FUNCDEF">void *<BCLASS="FSFUNC">SDL_GL_GetProcAddress</B></CODE>(const char* proc);</CODE></P><P></P></DIV></DIV><DIVCLASS="REFSECT1"><ANAME="AEN2688"></A><H2>Description</H2><P>Returns the address of the GL function <TTCLASS="PARAMETER"><I>proc</I></TT>, or <SPANCLASS="RETURNVALUE">NULL</SPAN> if the function is not found. If the GL library is loaded at runtime, with <AHREF="sdlglloadlibrary.html"><TTCLASS="FUNCTION">SDL_GL_LoadLibrary</TT></A>, then <SPANCLASS="emphasis"><ICLASS="EMPHASIS">all</I></SPAN> GL functions must be retrieved this way. Usually this is used to retrieve function pointers to OpenGL extensions.</P></DIV><DIVCLASS="REFSECT1"><ANAME="AEN2696"></A><H2>Example</H2><PRECLASS="PROGRAMLISTING">typedef void (*GL_ActiveTextureARB_Func)(unsigned int);GL_ActiveTextureARB_Func glActiveTextureARB_ptr = 0;int has_multitexture=1;.../* Get function pointer */glActiveTextureARB_ptr=(GL_ActiveTextureARB_Func) SDL_GL_GetProcAddress("glActiveTextureARB");/* Check for a valid function ptr */if(!glActiveTextureARB_ptr){ fprintf(stderr, "Multitexture Extensions not present.\n"); has_multitexture=0;}....if(has_multitexture){ glActiveTextureARB_ptr(GL_TEXTURE0_ARB); . .}else{ . .}</PRE></DIV><DIVCLASS="REFSECT1"><ANAME="AEN2699"></A><H2>See Also</H2><P><AHREF="sdlglloadlibrary.html"><TTCLASS="FUNCTION">SDL_GL_LoadLibrary</TT></A></P></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="sdlglloadlibrary.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="index.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="sdlglgetattribute.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">SDL_GL_LoadLibrary</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="video.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">SDL_GL_GetAttribute</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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