import sys, time, math, os
from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GLUT import *
from dmsgl import *

dir = os.getcwd() + os.sep

camera = PerspCamera()
camera.pitch(-20)
camera.moveBackward(15)

tex = Texture2D(dir+'caustic.tif')
material1 = Material()
material2 = Material(diffuse=Color.X11['brown'])
fog = Fog(color=Color([0.1, 0.5, 0.4, 0]), mode=GL_LINEAR, start=1, end=40)
light = Light()
light.position=[1,3,1]

startTime = time.time()

def setupTexGen():
	glEnable(GL_TEXTURE_GEN_S)
	glEnable(GL_TEXTURE_GEN_T)
	glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR)
	glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR)
	glTexGenfv(GL_S, GL_EYE_PLANE, [0.1, 0, 0, 0])
	glTexGenfv(GL_T, GL_EYE_PLANE, [0, 0, 0.1, 0])

def draw():
    fog.color.clear()
    
    camera.apply()
    light.apply()
    fog.apply()

    setupTexGen()
    tex.apply()
    material1.apply()
    t = time.time() - startTime
    glPushMatrix()
    glTranslatef(math.sin(t/8)*6, 0, math.cos(t/8)*6)
    glRotatef(radiansToDegrees(t/8)+90, 0, 1, 0)
    glScalef(1, 1, 3)
    glutSolidSphere(1, 32, 16)
    glPopMatrix()
    material2.apply()
    glBegin(GL_QUADS)
    glNormal3f(0, 1, 0)
    glVertex3f(-30, -5, 30)
    glVertex3f(30, -5, 30)
    glVertex3f(30, -5, -30)
    glVertex3f(-30, -5, -30)
    glEnd()
    tex.disable()
    
    glutSwapBuffers()


def keyboard(key, x, y):
    global viewDistance
    if key == chr(27):
        sys.exit(0)
    elif key == '.':
        camera.moveForward(1)
    elif key == ',':
        camera.moveBackward(1)

def specialkey(key,x,y):
    global cameraVelX, cameraVelY
    if key == GLUT_KEY_LEFT:
        cameraVelY += 90
    elif key == GLUT_KEY_RIGHT:
        cameraVelY -= 90
    elif key == GLUT_KEY_UP:
        cameraVelX += 90
    elif key == GLUT_KEY_DOWN:
        cameraVelX -= 90

def specialkeyUp(key,x,y):
    global cameraVelX, cameraVelY
    if key == GLUT_KEY_LEFT:
        cameraVelY -= 90
    elif key == GLUT_KEY_RIGHT:
        cameraVelY += 90
    elif key == GLUT_KEY_UP:
        cameraVelX -= 90
    elif key == GLUT_KEY_DOWN:
        cameraVelX += 90


cameraVelX = 0.0
cameraVelY = 0.0
prevTime = time.time()

def update():
    global viewRotX, viewRotY, cameraVelX, cameraVelY
    global prevTime
    t = time.time()
    dt = t - prevTime
    prevTime = t
    camera.pitch(cameraVelX * dt)
    camera.turn(cameraVelY * dt)
    glutPostRedisplay()

glutInit([])
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH)
glutInitWindowSize(400,400)
glutCreateWindow(sys.argv[0])
glutDisplayFunc(draw)
glutKeyboardFunc(keyboard)
glutSpecialFunc(specialkey)
glutSpecialUpFunc(specialkeyUp)
glutIgnoreKeyRepeat(1)
glutIdleFunc(update)
glEnable(GL_DEPTH_TEST)
glutMainLoop()