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  4. >SDL_GL_GetProcAddress</TITLE
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  39. >SDL Library Documentation</TH
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  68. ><H1
  69. ><A
  70. NAME="SDLGLGETPROCADDRESS"
  71. >SDL_GL_GetProcAddress</A
  72. ></H1
  73. ><DIV
  74. CLASS="REFNAMEDIV"
  75. ><A
  76. NAME="AEN2265"
  77. ></A
  78. ><H2
  79. >Name</H2
  80. >SDL_GL_GetProcAddress -- Get the address of a GL function</DIV
  81. ><DIV
  82. CLASS="REFSYNOPSISDIV"
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  84. NAME="AEN2268"
  85. ></A
  86. ><H2
  87. >Synopsis</H2
  88. ><DIV
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  90. ><A
  91. NAME="AEN2269"
  92. ></A
  93. ><P
  94. ></P
  95. ><PRE
  96. CLASS="FUNCSYNOPSISINFO"
  97. >#include "SDL.h"</PRE
  98. ><P
  99. ><CODE
  100. ><CODE
  101. CLASS="FUNCDEF"
  102. >void *<B
  103. CLASS="FSFUNC"
  104. >SDL_GL_GetProcAddress</B
  105. ></CODE
  106. >(const char* proc);</CODE
  107. ></P
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  115. NAME="AEN2275"
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  117. ><H2
  118. >Description</H2
  119. ><P
  120. >Returns the address of the GL function <TT
  121. CLASS="PARAMETER"
  122. ><I
  123. >proc</I
  124. ></TT
  125. >, or <SPAN
  126. CLASS="RETURNVALUE"
  127. >NULL</SPAN
  128. > if the function is not found. If the GL library is loaded at runtime, with <A
  129. HREF="sdlglloadlibrary.html"
  130. ><TT
  131. CLASS="FUNCTION"
  132. >SDL_GL_LoadLibrary</TT
  133. ></A
  134. >, then <I
  135. CLASS="EMPHASIS"
  136. >all</I
  137. > GL functions must be retrieved this way. Usually this is used to retrieve function pointers to OpenGL extensions.</P
  138. ></DIV
  139. ><DIV
  140. CLASS="REFSECT1"
  141. ><A
  142. NAME="AEN2283"
  143. ></A
  144. ><H2
  145. >Example</H2
  146. ><PRE
  147. CLASS="PROGRAMLISTING"
  148. >typedef void (*GL_ActiveTextureARB_Func)(unsigned int);
  149. GL_ActiveTextureARB_Func glActiveTextureARB_ptr = 0;
  150. int has_multitexture=1;
  151. .
  152. .
  153. .
  154. /* Get function pointer */
  155. glActiveTextureARB_ptr=(GL_ActiveTextureARB_Func) SDL_GL_GetProcAddress("glActiveTextureARB");
  156.  
  157. /* Check for a valid function ptr */
  158. if(!glActiveTextureARB_ptr){
  159.   fprintf(stderr, "Multitexture Extensions not present.\n");
  160.   has_multitexture=0;
  161. }
  162. .
  163. .
  164. .
  165. .
  166. if(has_multitexture){
  167.   glActiveTextureARB_ptr(GL_TEXTURE0_ARB);
  168.   .
  169.   .
  170. }
  171. else{
  172.   .
  173.   .
  174. }</PRE
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  179. NAME="AEN2286"
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  181. ><H2
  182. >See Also</H2
  183. ><P
  184. ><A
  185. HREF="sdlglloadlibrary.html"
  186. ><TT
  187. CLASS="FUNCTION"
  188. >SDL_GL_LoadLibrary</TT
  189. ></A
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