gluPerspective was removed in OpenGL 3.1, any replacements?

Question

I\'m trying to read some OpenGL tutorials on the net. the problem is that I found some old ones that use gluPerspective(). gluPerspective was deprecated in Open

Answer 1

This is a modified version of Dan's function, with simplified calculations from Unspecified Behavior.

void buildPerspProjMat(GLfloat *m, GLfloat fov, GLfloat aspect,
GLfloat znear, GLfloat zfar){

  GLfloat h = tan(fov);
  GLfloat w = h / aspect;
  GLfloat depth = znear - zfar;
  GLfloat q = (zfar + znear) / depth;
  GLfloat qn = 2 * zfar * znear / depth;

  m[0]  = w;  m[1]  = 0;  m[2]  = 0;  m[3]  = 0;

  m[4]  = 0;  m[5]  = h;  m[6]  = 0;  m[7]  = 0;

  m[8]  = 0;  m[9]  = 0;  m[10] = q;  m[11] = -1;

  m[12] = 0;  m[13] = 0;  m[14] = qn;  m[15] = 0;
}