CODEWITHSUNDEEP
c++eclipseopenglgccglew
Fred F
Fred F

Reputation: 1047

Function 'glWindowPos2i' could not be resolved?

While trying to compile a simple example openGL example to display text, I ran into the problem with 'glWindowPos2i' could not be resolved. glWindowPos2i seemed to compile fine as a C program under GCC, but for a could not be resolved error under eclipse as a c++ program with g++. (solution below)

The environment is eclipse (juno) under ubuntu 13.04 with openGL 3.3.0 (NVIDIA 310.44) GLEW version 1.8.0

Upvotes: 0

Views: 2224

Answers (1)

Fred F
Fred F

Reputation: 1047

The issue was that glWindowPos2i is an extension and in order compile with c++, glWindowPos2i needed to be defined by its address. At the top of the program, just after the includes glWindowPos2i needs to be defined as a global.

PFNGLWINDOWPOS2IPROC glWindowPos2i;

Then in the body of the program, after the glutInit, a value needs to be assigned to the global variable.

glWindowPos2i =  (PFNGLWINDOWPOS2IPROC) glutGetProcAddress("glWindowPos2i");

The glutGetProcAddress is defined by an include for and the definition for PFNGLWINDOWPOS2IPROC comes from

The full list of the includes I'm using are

#include <GL/glew.h>
#include <GL/glext.h>
#include <GL/freeglut.h>
#include <GL/freeglut_ext.h>

The linker includes I'm using are 

-lGL -lm -lglut -lGLEW -lGLU

Upvotes: 2

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