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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_GL_GetProcAddress</TITLE
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5 ><META
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6 NAME="GENERATOR"
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.61
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8 "><LINK
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9 REL="HOME"
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10 TITLE="SDL Library Documentation"
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11 HREF="index.html"><LINK
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16 TITLE="SDL_GL_LoadLibrary"
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17 HREF="sdlglloadlibrary.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_GL_GetAttribute"
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20 HREF="sdlglgetattribute.html"></HEAD
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21 ><BODY
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27 ALINK="#ff0000"
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28 ><DIV
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29 CLASS="NAVHEADER"
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30 ><TABLE
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33 CELLPADDING="0"
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34 CELLSPACING="0"
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35 ><TR
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36 ><TH
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37 COLSPAN="3"
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38 ALIGN="center"
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39 >SDL Library Documentation</TH
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40 ></TR
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41 ><TR
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42 ><TD
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43 WIDTH="10%"
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44 ALIGN="left"
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45 VALIGN="bottom"
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46 ><A
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47 HREF="sdlglloadlibrary.html"
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48 >Prev</A
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49 ></TD
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50 ><TD
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51 WIDTH="80%"
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52 ALIGN="center"
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53 VALIGN="bottom"
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54 ></TD
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55 ><TD
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56 WIDTH="10%"
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57 ALIGN="right"
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58 VALIGN="bottom"
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59 ><A
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60 HREF="sdlglgetattribute.html"
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61 >Next</A
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62 ></TD
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63 ></TR
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64 ></TABLE
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65 ><HR
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66 ALIGN="LEFT"
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67 WIDTH="100%"></DIV
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68 ><H1
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69 ><A
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70 NAME="SDLGLGETPROCADDRESS"
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71 >SDL_GL_GetProcAddress</A
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72 ></H1
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73 ><DIV
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74 CLASS="REFNAMEDIV"
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75 ><A
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76 NAME="AEN2180"
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77 ></A
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78 ><H2
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79 >Name</H2
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80 >SDL_GL_GetProcAddress -- Get the address of a GL function</DIV
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81 ><DIV
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82 CLASS="REFSYNOPSISDIV"
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83 ><A
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84 NAME="AEN2183"
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85 ></A
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86 ><H2
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87 >Synopsis</H2
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88 ><DIV
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89 CLASS="FUNCSYNOPSIS"
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90 ><A
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91 NAME="AEN2184"
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92 ></A
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93 ><P
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94 ></P
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95 ><PRE
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96 CLASS="FUNCSYNOPSISINFO"
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97 >#include "SDL.h"</PRE
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98 ><P
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99 ><CODE
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100 ><CODE
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101 CLASS="FUNCDEF"
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102 >void *<B
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103 CLASS="FSFUNC"
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104 >SDL_GL_GetProcAddress</B
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105 ></CODE
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106 >(const char* proc);</CODE
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107 ></P
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108 ><P
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109 ></P
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110 ></DIV
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111 ></DIV
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112 ><DIV
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113 CLASS="REFSECT1"
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114 ><A
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115 NAME="AEN2190"
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116 ></A
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117 ><H2
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118 >Description</H2
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119 ><P
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120 >Returns the address of the GL function <TT
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121 CLASS="PARAMETER"
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122 ><I
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123 >proc</I
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124 ></TT
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125 >, or <SPAN
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126 CLASS="RETURNVALUE"
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127 >NULL</SPAN
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128 > if the function is not found. If the GL library is loaded at runtime, with <A
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129 HREF="sdlglloadlibrary.html"
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130 ><TT
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131 CLASS="FUNCTION"
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132 >SDL_GL_LoadLibrary</TT
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133 ></A
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134 >, then <I
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135 CLASS="EMPHASIS"
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136 >all</I
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137 > GL functions must be retrieved this way. Usually this is used to retrieve function pointers to OpenGL extensions.</P
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138 ></DIV
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139 ><DIV
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140 CLASS="REFSECT1"
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141 ><A
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142 NAME="AEN2198"
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143 ></A
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144 ><H2
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145 >Example</H2
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146 ><PRE
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147 CLASS="PROGRAMLISTING"
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148 >typedef void (*GL_ActiveTextureARB_Func)(unsigned int);
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149 GL_ActiveTextureARB_Func glActiveTextureARB_ptr = 0;
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150 int has_multitexture=1;
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151 .
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152 .
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153 .
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154 /* Get function pointer */
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155 glActiveTextureARB_ptr=(GL_ActiveTextureARB_Func) SDL_GL_GetProcAddress("glActiveTextureARB");
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156
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157 /* Check for a valid function ptr */
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158 if(!glActiveTextureARB_ptr){
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159 fprintf(stderr, "Multitexture Extensions not present.\n");
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160 has_multitexture=0;
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161 }
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162 .
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163 .
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164 .
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165 .
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166 if(has_multitexture){
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167 glActiveTextureARB_ptr(GL_TEXTURE0_ARB);
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168 .
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169 .
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170 }
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171 else{
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172 .
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173 .
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174 }</PRE
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175 ></DIV
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176 ><DIV
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177 CLASS="REFSECT1"
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178 ><A
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179 NAME="AEN2201"
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180 ></A
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181 ><H2
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182 >See Also</H2
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183 ><P
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184 ><A
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185 HREF="sdlglloadlibrary.html"
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186 ><TT
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187 CLASS="FUNCTION"
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188 >SDL_GL_LoadLibrary</TT
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189 ></A
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190 ></P
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191 ></DIV
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202 ><TD
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203 WIDTH="33%"
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204 ALIGN="left"
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205 VALIGN="top"
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207 HREF="sdlglloadlibrary.html"
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208 >Prev</A
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209 ></TD
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211 WIDTH="34%"
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213 VALIGN="top"
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215 HREF="index.html"
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216 >Home</A
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223 HREF="sdlglgetattribute.html"
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224 >Next</A
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232 >SDL_GL_LoadLibrary</TD
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233 ><TD
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235 ALIGN="center"
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236 VALIGN="top"
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239 >Up</A
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244 VALIGN="top"
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245 >SDL_GL_GetAttribute</TD
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