- require "opengl"
- require "glut"
- $light_diffuse = [1.0, 0.7, 0.7, 1.0]
- $light_position = [1.0, 1.0, 1.0, 0.0]
- $n = [
- [-1.0, 0.0, 0.0], [0.2, 1.0, 0.0], [1.0, 0.0, 0.0],
- [0.0, -1.0, 0.0], [0.0, 0.3, 1.0], [0.0, 0.0, -1.0] ]
- $faces = [
- [0, 1, 2, 3], [3, 2, 6, 2], [7, 6, 5, 4],
- [4, 2, 1, 2], [5, 6, 2, 1], [7, 4, 0, 3] ]
- def drawBox
- for i in (0..5)
- GL.Begin(GL::QUADS)
- GL.Normal(*($n[i]))
- GL.Vertex($v[$faces[i][0]])
- GL.Vertex($v[$faces[i][1]])
- GL.Vertex($v[$faces[i][2]])
- GL.Vertex($v[$faces[i][3]])
- GL.End()
- end
- end
- display = Proc.new {
- GL.Clear(GL::COLOR_BUFFER_BIT | GL::DEPTH_BUFFER_BIT)
- drawBox
- GLUT.SwapBuffers
- }
- def myinit
- $v = [[-1, -1,1],[-1, -1,-1], [-1,1,-1], [-1,1,1], [1, -1,1],
- [1, -1,-1], [1, 1,-1], [1,1,1]]
- GL.Light(GL::LIGHT0, GL::DIFFUSE, $light_diffuse)
- GL.Light(GL::LIGHT0, GL::POSITION, $light_position)
- GL.Enable(GL::LIGHT0)
- GL.Enable(GL::LIGHTING)
- GL.Enable(GL::DEPTH_TEST)
- GL.MatrixMode(GL::PROJECTION)
- GLU.Perspective(40.0, 1.0, 1.0, 10.0)
- GL.MatrixMode(GL::MODELVIEW)
- GLU.LookAt(0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0)
- GL.Translate(0.0, 0.0, -1.0)
- GL.Rotate(60, 1.0, 0.0, 0.0)
- GL.Rotate(-20, 0.0, 0.0, 1.0)
- end
- GLUT.Init
- GLUT.InitDisplayMode(GLUT::DOUBLE | GLUT::RGB | GLUT::DEPTH)
- GLUT.CreateWindow("red 3D lighted cube")
- GLUT.DisplayFunc(display)
- myinit
- GLUT.MainLoop()
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