251 lines
3.4 KiB
HTML
251 lines
3.4 KiB
HTML
<HTML
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><HEAD
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>SDL_GL_GetProcAddress</TITLE
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.64
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>SDL Library Documentation</TH
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><H1
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><A
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NAME="SDLGLGETPROCADDRESS"
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>SDL_GL_GetProcAddress</A
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></H1
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><DIV
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CLASS="REFNAMEDIV"
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><A
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NAME="AEN2259"
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></A
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><H2
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>Name</H2
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>SDL_GL_GetProcAddress -- Get the address of a GL function</DIV
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><DIV
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CLASS="REFSYNOPSISDIV"
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><A
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NAME="AEN2262"
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></A
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><H2
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>Synopsis</H2
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><DIV
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CLASS="FUNCSYNOPSIS"
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><A
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NAME="AEN2263"
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></A
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><P
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></P
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><PRE
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CLASS="FUNCSYNOPSISINFO"
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>#include "SDL.h"</PRE
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><P
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><CODE
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><CODE
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CLASS="FUNCDEF"
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>void *<B
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CLASS="FSFUNC"
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>SDL_GL_GetProcAddress</B
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></CODE
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>(const char* proc);</CODE
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></P
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><P
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></P
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></DIV
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN2269"
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></A
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><H2
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>Description</H2
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><P
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>Returns the address of the GL function <TT
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CLASS="PARAMETER"
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><I
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>proc</I
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></TT
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>, or <SPAN
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CLASS="RETURNVALUE"
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>NULL</SPAN
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> if the function is not found. If the GL library is loaded at runtime, with <A
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HREF="sdlglloadlibrary.html"
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><TT
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CLASS="FUNCTION"
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>SDL_GL_LoadLibrary</TT
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></A
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>, then <I
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CLASS="EMPHASIS"
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>all</I
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> GL functions must be retrieved this way. Usually this is used to retrieve function pointers to OpenGL extensions.</P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN2277"
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></A
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><H2
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>Example</H2
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><PRE
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CLASS="PROGRAMLISTING"
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>typedef void (*GL_ActiveTextureARB_Func)(unsigned int);
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GL_ActiveTextureARB_Func glActiveTextureARB_ptr = 0;
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int has_multitexture=1;
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.
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.
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.
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/* Get function pointer */
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glActiveTextureARB_ptr=(GL_ActiveTextureARB_Func) SDL_GL_GetProcAddress("glActiveTextureARB");
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/* Check for a valid function ptr */
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if(!glActiveTextureARB_ptr){
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fprintf(stderr, "Multitexture Extensions not present.\n");
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has_multitexture=0;
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}
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.
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.
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.
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.
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if(has_multitexture){
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glActiveTextureARB_ptr(GL_TEXTURE0_ARB);
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.
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.
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}
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else{
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.
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.
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}</PRE
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN2280"
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></A
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><H2
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>See Also</H2
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><P
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><A
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HREF="sdlglloadlibrary.html"
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><TT
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CLASS="FUNCTION"
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>SDL_GL_LoadLibrary</TT
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></A
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>Prev</A
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