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>SDL_GL_GetProcAddress</TITLE |
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><H1 |
><A |
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>SDL_GL_GetProcAddress</A |
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>Name</H2 |
>SDL_GL_GetProcAddress -- Get the address of a GL function</DIV |
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>Synopsis</H2 |
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><P |
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><PRE |
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>#include "SDL.h"</PRE |
><P |
><CODE |
><CODE |
CLASS="FUNCDEF" |
>void *<B |
CLASS="FSFUNC" |
>SDL_GL_GetProcAddress</B |
></CODE |
>(const char* proc);</CODE |
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><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 |
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>all</I |
> GL functions must be retrieved this way. Usually this is used to retrieve function pointers to OpenGL extensions.</P |
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><H2 |
>Example</H2 |
><PRE |
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>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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>See Also</H2 |
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><TT |
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>SDL_GL_LoadLibrary</TT |
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