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

# This is needed for OSX - the OpenGL.GL.ARB.multitexture functions generate errors
if hasattr(os,'uname') and os.uname()[0] == 'Darwin':
    import multitex
    glActiveTextureARB = multitex.activetexture
    glMultiTexCoord2fARB = multitex.texcoord2f

startdir = os.getcwd()


camera = PerspCamera()
camera.moveBackward(25)
light = Light()
light.position = [1, 3, 2, 0]
basetex = Texture2D('basetex.jpg', minFilter=GL_LINEAR_MIPMAP_LINEAR)
detailtex = Texture2D('rock.jpg', minFilter=GL_LINEAR_MIPMAP_LINEAR)

showTex1 = True
showTex2 = True

def drawSquare():
    Color.White.apply()
    if showTex1:
        glActiveTextureARB(GL_TEXTURE0_ARB)
        basetex.apply()
    if showTex2:
        glActiveTextureARB(GL_TEXTURE1_ARB)
        detailtex.apply()
    glBegin(GL_QUADS)
    glTexCoord2f(0, 0)
    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0, 0)
    glVertex3f(-10, -10, 0)
    glTexCoord2f(1, 0)
    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 16, 0)
    glVertex3f(10, -10, 0)
    glTexCoord2f(1, 1)
    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 16, 16)
    glVertex3f(10, 10, 0)
    glTexCoord2f(0, 1)
    glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0, 16)
    glVertex3f(-10, 10, 0)
    glEnd()
    glActiveTextureARB(GL_TEXTURE1_ARB)
    detailtex.disable()
    glActiveTextureARB(GL_TEXTURE0_ARB)
    basetex.disable()

def draw():
    Color.X11['DeepSkyBlue'].clear()
    camera.apply()
    light.apply()

    drawSquare()

    glutSwapBuffers()


def keyboard(key, x, y):
    global cameraVelDist, showTex1, showTex2
    if key == chr(27):
        sys.exit(0)
    elif key == '.':
        cameraVelDist += 4
    elif key == ',':
        cameraVelDist += -4
    elif key == '1':
        showTex1 = not showTex1
    elif key == '2':
        showTex2 = not showTex2

def keyboardUp(key, x, y):
    global cameraVelDist
    if key == chr(27):
        sys.exit(0)
    elif key == '.':
        cameraVelDist -= 4
    elif key == ',':
        cameraVelDist -= -4

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

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


cameraVelPitch = 0.0
cameraVelTurn = 0.0
cameraVelDist = 0.0
prevTime = time.time()

def update():
    global cameraVelPitch, cameraVelTurn, cameraVelDist
    global prevTime
    t = time.time()
    dt = t - prevTime
    prevTime = t
    camera.pitch(cameraVelPitch * dt)
    camera.turn(cameraVelTurn * dt)
    camera.moveForward(cameraVelDist * dt)
    glutPostRedisplay()

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