OpenGL 4 Shading Language Cookbook - Third Edition

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It is often useful to query for the supported extensions of the current OpenGL implementation.  Extension names are indexed and can be individually queried by index. We use the glGetStringi variant for this. For example, to get the name of the extension stored at index i, we use glGetStringi(GL_EXTENSIONS, i). To print a list of all extensions, we could use the following code:

GLint nExtensions; 
glGetIntegerv(GL_NUM_EXTENSIONS, &nExtensions); 
 
for( int i = 0; i < nExtensions; i++ ) 
      printf("%s\n", glGetStringi( GL_EXTENSIONS, i ) );