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

startDir = os.getcwd()

camera = PerspCamera()
camera.moveBackward(1.5)
xRot, yRot = 0,0

class TexMesh:
    def __init__(self, cols=4, rows=4, width=1.0, height=1.0, texture=None):
        self.cols = cols
        self.rows = rows
        self.width = width
        self.height = height
        self.texture = texture
    def draw(self):
#        glPolygonMode(GL_FRONT_AND_BACK, GL_LINE)
        if self.texture: self.texture.apply()
        glColor4f(1,1,1,1)
        for i in range(0,self.rows-1):
            glBegin(GL_TRIANGLE_STRIP)
            for j in range(0,self.cols):
                glTexCoord2f(j/(self.cols-1.0), i/(self.rows-1.0))
                x = (j/(self.cols-1.0)-0.5)*self.width
                y = (i/(self.rows-1.0)-0.5)*self.height
                glVertex3f(x, y, 0)
                glTexCoord2f(j/(self.cols-1.0), (i+1)/(self.rows-1.0))
                y = ((i+1)/(self.rows-1.0)-0.5)*self.height
                glVertex3f(x, y, 0)
            glEnd()
        if self.texture: self.texture.disable()

objects = []

def createObjects():
    global objects
    bg = TexMesh(10, 10, texture=Texture2D('flower1.png'))
    objects.append(bg)


def draw():
    glClearColor(0, 0.3, 0.5, 0)
    glLineWidth(3)
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
    
    camera.apply()

    glPushMatrix()
    glRotatef(yRot, 0, 1, 0)
    glRotatef(xRot, 1, 0, 0)
    for o in objects:
        o.draw()
    glPopMatrix()
    
    glutSwapBuffers()


def keyboard(key, x, y):
    if key == chr(27):
        sys.exit(0)

def specialkey(key,x,y):
    global xRot, yRot
    if key == GLUT_KEY_LEFT:
        yRot -= 2.0
    elif key == GLUT_KEY_RIGHT:
        yRot += 2.0
    elif key == GLUT_KEY_UP:
        xRot += 2.0
    elif key == GLUT_KEY_DOWN:
        xRot -= 2.0


def update(dummy):
    glutTimerFunc(16, update, 0)
    glutPostRedisplay()

glutInit([])
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH)
glutInitWindowSize(700,700)
glutCreateWindow(sys.argv[0])
glutDisplayFunc(draw)
glutKeyboardFunc(keyboard)
glutSpecialFunc(specialkey)
glutTimerFunc(1, update, 0)
os.chdir(startDir)
glEnable(GL_DEPTH_TEST)
createObjects()
glutMainLoop()