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| NAME="SDLGLGETPROCADDRESS" |
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| >SDL_GL_GetProcAddress</H1 |
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| CLASS="REFNAMEDIV" |
| ><A |
| NAME="AEN2678" |
| ></A |
| ><H2 |
| >Name</H2 |
| >SDL_GL_GetProcAddress -- Get the address of a GL function</DIV |
| ><DIV |
| CLASS="REFSYNOPSISDIV" |
| ><A |
| NAME="AEN2681" |
| ></A |
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| >Synopsis</H2 |
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| NAME="AEN2682" |
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| ><P |
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| ><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 |
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| NAME="AEN2688" |
| ></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 <SPAN |
| CLASS="emphasis" |
| ><I |
| CLASS="EMPHASIS" |
| >all</I |
| ></SPAN |
| > GL functions must be retrieved this way. Usually this is used to retrieve function pointers to OpenGL extensions.</P |
| ></DIV |
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| CLASS="REFSECT1" |
| ><A |
| NAME="AEN2696" |
| ></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 |
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| ><H2 |
| >See Also</H2 |
| ><P |
| ><A |
| HREF="sdlglloadlibrary.html" |
| ><TT |
| CLASS="FUNCTION" |
| >SDL_GL_LoadLibrary</TT |
| ></A |
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