#define glGenBuffers  ((PFNGLGENBUFFERSPROC)(glFP[0]))
#define glBindBuffer  ((PFNGLBINDBUFFERPROC)(glFP[1]))
#define glBufferData  ((PFNGLBUFFERDATAPROC)(glFP[2]))
#define glCreateShader  ((PFNGLCREATESHADERPROC)(glFP[3]))
#define glShaderSource  ((PFNGLSHADERSOURCEPROC)(glFP[4]))
#define glCompileShader  ((PFNGLCOMPILESHADERPROC)(glFP[5]))
#define glAttachShader  ((PFNGLATTACHSHADERPROC)(glFP[6]))
#define glLinkProgram  ((PFNGLLINKPROGRAMPROC)(glFP[7]))
#define glUseProgram  ((PFNGLUSEPROGRAMPROC)(glFP[8]))
#define glCreateProgram  ((PFNGLCREATEPROGRAMPROC)(glFP[9]))

typedef void (*GenFP)(void); // any function ptr type would do
GenFP glFP[10];
const char* glnames[]={
    "glGenBuffers","glBindBuffer", "glBufferData",
    "glCreateShader","glShaderSource","glCompileShader",
    "glAttachShader","glLinkProgram","glUseProgram","glCreateProgram"
};

 void create_ext() {
    int i;
    for (i=0; i<10; i++) glFP[i] = (GenFP)wglGetProcAddress(glnames[i]);
}