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clevermous |
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>SDL_GL_GetProcAddress |
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NAME="GENERATOR" |
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CONTENT="Modular DocBook HTML Stylesheet Version 1.64 |
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TITLE="SDL Library Documentation" |
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TITLE="SDL_GL_LoadLibrary" |
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TITLE="SDL_GL_GetAttribute" |
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>SDL Library Documentation |
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WIDTH="10%" |
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ALIGN="left" |
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VALIGN="bottom" |
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HREF="sdlglloadlibrary.html" |
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>Prev |
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HREF="sdlglgetattribute.html" |
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>Next |
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WIDTH="100%"> |
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NAME="SDLGLGETPROCADDRESS" |
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>SDL_GL_GetProcAddress |
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CLASS="REFNAMEDIV" |
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NAME="AEN2259" |
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>Name |
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>SDL_GL_GetProcAddress -- Get the address of a GL function |
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CLASS="REFSYNOPSISDIV" |
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NAME="AEN2262" |
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>Synopsis |
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CLASS="FUNCSYNOPSIS" |
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NAME="AEN2263" |
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CLASS="FUNCSYNOPSISINFO" |
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>#include "SDL.h" |
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CLASS="FUNCDEF" |
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>void * |
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CLASS="FSFUNC" |
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>SDL_GL_GetProcAddress |
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>(const char* proc); |
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CLASS="REFSECT1" |
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NAME="AEN2269" |
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>Description |
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>Returns the address of the GL function |
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CLASS="PARAMETER" |
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>proc |
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>, or |
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CLASS="RETURNVALUE" |
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>NULL |
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> if the function is not found. If the GL library is loaded at runtime, with |
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HREF="sdlglloadlibrary.html" |
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CLASS="FUNCTION" |
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>SDL_GL_LoadLibrary |
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>, then |
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CLASS="EMPHASIS" |
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>all |
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> GL functions must be retrieved this way. Usually this is used to retrieve function pointers to OpenGL extensions. |
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CLASS="REFSECT1" |
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NAME="AEN2277" |
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>Example |
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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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} |
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CLASS="REFSECT1" |
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NAME="AEN2280" |
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>See Also |
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HREF="sdlglloadlibrary.html" |
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CLASS="FUNCTION" |
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>SDL_GL_LoadLibrary |
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CLASS="NAVFOOTER" |
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>
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ALIGN="LEFT" |
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WIDTH="100%"> |
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> |