OpenGL extension without using wglprocaddress?

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Leadwerks

I need to get the pointer to the extension function glDrawElementsInstancedEXT(). I used to use wglgetprocaddress() but then I started relying on Glew. How do I do this in a way so that it works on all platforms?

I really need this answer. For some reason retrieving the pointer to some functions corrupts some of my memory. Something must be wrong:

Extern
	Function wglGetProcAddress:Byte Ptr(name$)="wglGetProcAddress@4"
EndExtern


SetGraphicsDriver GLGraphicsDriver(),GRAPHICS_BACKBUFFER|GRAPHICS_DEPTHBUFFER
Graphics 1024,768,0
glewInit()


Global glUniformBufferEXT(a%,b%,c%) "win32"
Global glDrawElementsInstancedEXT(mode_:Int,count_:Int,type_:Int,indices:Byte Ptr,primcount:Int) "win32"

glDrawElementsInstancedEXT=wglGetProcAddress("glDrawElementsInstancedEXT")
glUniformBufferEXT=wglGetProcAddress("glUniformBufferEXT")