.TH "SDL_GL_GetProcAddress" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" +
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.SH "NAME"+
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SDL_GL_GetProcAddress\- Get the address of a GL function+
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.SH "SYNOPSIS"+
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.PP+
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\fB#include "SDL\&.h"+
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.sp+
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\fBvoid *\fBSDL_GL_GetProcAddress\fP\fR(\fBconst char* proc\fR);+
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.SH "DESCRIPTION"+
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.PP+
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Returns the address of the GL function \fBproc\fR, or \fBNULL\fR if the function is not found\&. If the GL library is loaded at runtime, with \fI\fBSDL_GL_LoadLibrary\fP\fR, then \fIall\fP GL functions must be retrieved this way\&. Usually this is used to retrieve function pointers to OpenGL extensions\&.+
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.SH "EXAMPLE"+
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.PP+
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.nf+
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\f(CWtypedef 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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+
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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\&.+
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");+
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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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}\fR+
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.fi+
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.PP+
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.SH "SEE ALSO"+
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.PP+
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\fI\fBSDL_GL_LoadLibrary\fP\fR+
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...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01+
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