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#!/usr/bin/env python
from __future__ import print_function
from PyQt5.QtGui import QOpenGLWindow,QSurfaceFormat
from PyQt5.QtWidgets import QApplication
from  PyQt5.QtCore import *
from pyngl import *
from OpenGL.GL import *
class MainWindow(QOpenGLWindow) :
  def __init__(self, parent=None):
    QOpenGLWindow.__init__(self)
    self.mouseGlobalTX=Mat4()
    self.width=int(1024)
    self.height=int(720)
    self.setTitle('Boid')
    self.spinXFace = int(0)
    self.spinYFace = int(0)
    self.rotate = False
    self.translate = False
    self.origX = int(0)
    self.origY = int(0)
    self.origXPos = int(0)
    self.origYPos = int(0)
    self.INCREMENT=0.01
    self.ZOOM=0.1
    self.modelPos=Vec3()
    self.view=Mat4()
    self.project=Mat4()
    self.vao=None
  def initializeGL(self) :
    self.makeCurrent()
    NGLInit.instance()
    glClearColor( 0.4, 0.4, 0.4, 1.0 ) 
    glEnable( GL_DEPTH_TEST )
    glEnable( GL_MULTISAMPLE )
    shader=ShaderLib.instance()
    self.view=lookAt(Vec3(0,1,4),Vec3.zero(),Vec3.up())
    self.project=perspective( 45.0, 720.0 / 576.0, 0.05, 350.0 )
    shader.use('nglColourShader') 
    shader.setUniform('Colour',1.0,1.0,1.0,1.0) 
    self.buildVAO()
  def buildVAO(self) :
    verts=VectorVec3([
    Vec3(0.0,1.0,1.0),
    Vec3(0.0,0.0,-1.0),
    Vec3(-0.5,0.0,1.0),
    Vec3(0.0,1.0,1.0),
    Vec3(0.0,0.0,-1.0),
    Vec3(0.5,0.0,1.0),
    Vec3(0.0,1.0,1.0),
    Vec3(0.0,0.0,1.5),
    Vec3(-0.5,0.0,1.0),
    Vec3(0.0,1.0,1.0),
    Vec3(0.0,0.0,1.5),
    Vec3(0.5,0.0,1.0)])
    self.vao=VAOFactory.createVAO(simpleVAO,GL_TRIANGLES)
    self.vao.bind()
    self.vao.setData(len(verts)*Vec3.sizeof(),verts)
    self.vao.setVertexAttributePointer(0,3,GL_FLOAT,0,0)
    self.vao.setNumIndices(len(verts)) 
    self.vao.unbind() 
  def loadMatricesToShader(self) :
    shader = ShaderLib.instance()    
    shader.setUniform( 'MVP', self.project* self.view * self.mouseGlobalTX ) 
  def paintGL(self):
      self.makeCurrent()
      glViewport( 0, 0, self.width, self.height )
      shader=ShaderLib.instance()
      glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT )
      shader.use('nglColourShader')
      shader.setUniform('Colour',1.0,1.0,1.0,1.0)
      rotX=Mat4() 
      rotY=Mat4() 
      rotX.rotateX( self.spinXFace ) 
      rotY.rotateY( self.spinYFace ) 
      self.mouseGlobalTX = rotY * rotX 
      self.mouseGlobalTX.m_30  = self.modelPos.m_x 
      self.mouseGlobalTX.m_31  = self.modelPos.m_y 
      self.mouseGlobalTX.m_32  = self.modelPos.m_z 
      self.loadMatricesToShader()
      self.vao.bind()
      self.vao.draw()
      self.vao.unbind()
    except OpenGL.error.GLError :
      print ('error')
  def resizeGL(self, w,h) :
    self.width=int(w* self.devicePixelRatio())
    self.height=int(h* self.devicePixelRatio())
    self.project=perspective( 45.0, float( w ) / h, 0.05, 350.0 )
  def keyPressEvent(self, event) :
    key=event.key()
    if key==Qt.Key_Escape :
      exit()
    elif key==Qt.Key_W :
      glPolygonMode(GL_FRONT_AND_BACK,GL_LINE)
    elif key==Qt.Key_S :
      glPolygonMode(GL_FRONT_AND_BACK,GL_FILL)
    elif key==Qt.Key_Space :
      self.spinXFace=0
      self.spinYFace=0
      self.modelPos.set(Vec3.zero())
    self.update()
  def mouseMoveEvent(self, event) :
    if self.rotate and event.buttons() == Qt.LeftButton  :
      diffx = event.x() - self.origX
      diffy = event.y() - self.origY
      self.spinXFace += int( 0.5 * diffy )
      self.spinYFace += int( 0.5 * diffx )
      self.origX = event.x()
      self.origY = event.y()
      self.update()
    elif  self.translate and event.buttons() == Qt.RightButton :
      diffX      = int( event.x() - self.origXPos )
      diffY      = int( event.y() - self.origYPos )
      self.origXPos = event.x()
      self.origYPos = event.y()
      self.modelPos.m_x += self.INCREMENT * diffX 
      self.modelPos.m_y -= self.INCREMENT * diffY 
      self.update() 
  def mousePressEvent(self,event) :
    if  event.button() == Qt.LeftButton :
      self.origX  = event.x()
      self.origY  = event.y()
      self.rotate = True
    elif  event.button() == Qt.RightButton :
      self.origXPos  = event.x() 
      self.origYPos  = event.y() 
      self.translate = True
  def mouseReleaseEvent(self,event) :
    if  event.button() == Qt.LeftButton :
      self.rotate = False
    elif  event.button() == Qt.RightButton :
      self.translate = False
  def wheelEvent(self,event) :
    numPixels = event.pixelDelta() 
    if  numPixels.x() > 0  :
      self.modelPos.m_z += self.ZOOM
    elif  numPixels.x() < 0 :
      self.modelPos.m_z -= self.ZOOM
    self.update() 
if __name__ == '__main__':
  app = QApplication(sys.argv)
  format=QSurfaceFormat()
  format.setSamples(4) 
  format.setMajorVersion(4) 
  format.setMinorVersion(1) 
  format.setProfile(QSurfaceFormat.CoreProfile) 
  # now set the depth buffer to 24 bits
  format.setDepthBufferSize(24) 
  # set that as the default format for all windows
  QSurfaceFormat.setDefaultFormat(format) 
  window = MainWindow()
  window.setFormat(format)
  window.resize(1024,720)
  window.show()
  sys.exit(app.exec_())
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