Qt Opengl

目前在Qt5中做Opengl的学习时候，发现gluPerspective函数没有定义。

1:

　　gluPerspective( 45.0, (GLfloat)width/(GLfloat)height, 0.1, 100.0 );
2:

  GLfloat zNear = 0.1;

  GLfloat zFar = 100.0;

  GLfloat aspect = (GLfloat)width/(GLfloat)height;

  GLfloat fH = tan(GLfloat(45.0/360.0*3.14159))*zNear;

  GLfloat fW = fH * aspect;

  glFrustum(-fW, fW, -fH, fH, zNear, zFar);