c++ - glMatrixMode(GL_MODELVIEW) use giving segmentation fault -

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i trying implement camera fps project , having trouble when using camera class on main.cpp when calling glmatrixmode(gl_modelview).

here relevant functions:

void camera::init() {      m_yaw = 0.0;     m_pitch = 0.0;     set_pos(0,0,0); }  void camera::set_pos(float x, float y, float z) {     m_x = x;     m_y = y;     m_z = z;      refresh(); }  void camera::refresh() {     m_lx = cos(m_yaw) * cos(m_pitch);     m_ly = sin(m_pitch);     m_lz = sin(m_yaw) * cos(m_pitch);      m_strafe_lx = cos(m_yaw - m_pi_2);     m_strafe_lz = sin(m_yaw - m_pi_2);      glmatrixmode(gl_modelview);     glloadidentity();     printf("the segmentation fault above!\n");     glulookat(m_x, m_y, m_z, m_x + m_lx, m_y + m_ly, m_z + m_lz, 0.0, 1.0, 0.0);      //printf("camera: %f %f %f direction vector: %f %f %f\n", m_x, m_y, m_z, m_lx, m_ly, m_lz); }

in case if include glew.h, need initialize beforehand, otherwise gl api calls replaced null function pointers , causes segfaults.


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