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view docs/html/sdlglgetprocaddress.html @ 701:aaf3b8af6616
Date: Sat, 30 Aug 2003 16:28:10 +0300
From: "Mike Gorchak"
Subject: Re: SDL 1.2.6
- minor changes about shared library building under QNX6 into README.QNX
- added forgotten libSDLmain.a into distribution, SDL.qpg.in
- added header guards to the all headers.
- fixed fullscreen double buffered mode.
- fixed Photon crashes after/during using fullscreen OpenGL modes.
- added GL_MakeCurrent function.
- added SDL_VIDEOEXPOSE event, when OpenGL window have been resized
- added more HAVE_OPENGL checks to avoid dead code compilation without using OpenGL
- finished code reorganization (began into previous patches).
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Sat, 30 Aug 2003 17:07:59 +0000 |
parents | e5bc29de3f0a |
children | 355632dca928 |
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<HTML ><HEAD ><TITLE >SDL_GL_GetProcAddress</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.64 "><LINK REL="HOME" TITLE="SDL Library Documentation" HREF="index.html"><LINK REL="UP" TITLE="Video" HREF="video.html"><LINK REL="PREVIOUS" TITLE="SDL_GL_LoadLibrary" HREF="sdlglloadlibrary.html"><LINK REL="NEXT" TITLE="SDL_GL_GetAttribute" HREF="sdlglgetattribute.html"></HEAD ><BODY CLASS="REFENTRY" BGCOLOR="#FFF8DC" TEXT="#000000" LINK="#0000ee" VLINK="#551a8b" ALINK="#ff0000" ><DIV CLASS="NAVHEADER" ><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >SDL Library Documentation</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="sdlglloadlibrary.html" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="sdlglgetattribute.html" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="SDLGLGETPROCADDRESS" >SDL_GL_GetProcAddress</A ></H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN2294" ></A ><H2 >Name</H2 >SDL_GL_GetProcAddress -- Get the address of a GL function</DIV ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN2297" ></A ><H2 >Synopsis</H2 ><DIV CLASS="FUNCSYNOPSIS" ><A NAME="AEN2298" ></A ><P ></P ><PRE CLASS="FUNCSYNOPSISINFO" >#include "SDL.h"</PRE ><P ><CODE ><CODE CLASS="FUNCDEF" >void *<B CLASS="FSFUNC" >SDL_GL_GetProcAddress</B ></CODE >(const char* proc);</CODE ></P ><P ></P ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN2304" ></A ><H2 >Description</H2 ><P >Returns the address of the GL function <TT CLASS="PARAMETER" ><I >proc</I ></TT >, or <SPAN CLASS="RETURNVALUE" >NULL</SPAN > if the function is not found. If the GL library is loaded at runtime, with <A HREF="sdlglloadlibrary.html" ><TT CLASS="FUNCTION" >SDL_GL_LoadLibrary</TT ></A >, then <I CLASS="EMPHASIS" >all</I > GL functions must be retrieved this way. Usually this is used to retrieve function pointers to OpenGL extensions.</P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN2312" ></A ><H2 >Example</H2 ><PRE CLASS="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 ><DIV CLASS="REFSECT1" ><A NAME="AEN2315" ></A ><H2 >See Also</H2 ><P ><A HREF="sdlglloadlibrary.html" ><TT CLASS="FUNCTION" >SDL_GL_LoadLibrary</TT ></A ></P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="sdlglloadlibrary.html" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="sdlglgetattribute.html" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >SDL_GL_LoadLibrary</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="video.html" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >SDL_GL_GetAttribute</TD ></TR ></TABLE ></DIV ></BODY ></HTML >