func gluPerspective(fovy float64, aspect float64, zNear float64, zFar float64) { gl.MatrixMode(gl.PROJECTION) gl.LoadIdentity() ymax := zNear * math.Tan(fovy*math.Pi/360) ymin := -ymax xmin := ymin * aspect xmax := ymax * aspect gl.Frustum(xmin, xmax, ymin, ymax, zNear, zFar) }
func setupGL() { gl.ShadeModel(gl.FLAT) gl.ClearColor(0.75, 0.75, 0.75, 1.0) gl.Enable(gl.DEPTH_TEST) gl.LineWidth(1) gl.Viewport(0, 0, winWidth, winHeight) gl.Hint(gl.PERSPECTIVE_CORRECTION_HINT, gl.NICEST) gluPerspective(45, float64(winWidth)/winHeight, 10, 1000) gl.MatrixMode(gl.MODELVIEW) gl.LoadIdentity() }