c++ - GLUPerspective 的原始 OpenGL 等价物？

Question

如果没有 Glu，我怎么能像 GluPerspective 一样呢？谢谢

例如:gluPerspective(45.0, (float)w/(float)h, 1.0, 200.0);

Answer 1

void gluPerspective( GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar )
{
    GLdouble xmin, xmax, ymin, ymax;

    ymax = zNear * tan( fovy * M_PI / 360.0 );
    ymin = -ymax;
    xmin = ymin * aspect;
    xmax = ymax * aspect;

    glFrustum( xmin, xmax, ymin, ymax, zNear, zFar );
}