[PyOpenGL-Devel] Problem with numpy and OpenGL textures

[Adeola B. <the...@gm...>]

Hi everyone,

I'm doing a project using wxPython and pyopengl, and I seem to have a
problem rendering textures. This is code that worked before my hard
drive had a meltdown, but not since I re-installed everything.

I've determined the problem is in the OpenGL part of my program. I do
some calculations to generate a 2D numpy array that holds the image
data, and pylab.imshow() shows me the image as it is meant to be. I
used the same algorithm in Octave and MATLAB, and all are giving me
the right picture.

However, using pyOpenGL and the numpyhandler functions (http://cours-
info.iut-bm.univ-fcomte.fr/docs/python/OpenGL/
OpenGL.arrays.numpymodule.NumpyHandler-class.html) doesn't seem to
work. I get a garbled screen pocked with black pixels. I am including
my openGL code below. What am I doing wrong?

And yes, I did make the dtype of my array 'float32'.

-------code snippets------

import wx
from wx.glcanvas import GLCanvas

from OpenGL.GLU import *
from OpenGL.GL import *
from OpenGL.arrays.numpymodule import NumpyHandler

PC = 1
RI = 0

class myGLCanvas(GLCanvas):
        def __init__(self, parent):
                GLCanvas.__init__(self, parent,-1)
                wx.EVT_PAINT(self, self.OnPaint)
                self.init = 0
                self.mode = -1
                # making a texture for the range image
                self.texture = glGenTextures(1)
                # making a spot for the point cloud points
                self.cloud = None
                return

        def OnPaint(self,event):
                dc = wx.PaintDC(self)
                self.SetCurrent()
                if not self.init:
                        self.InitGL()
                        self.init = 1
                self.OnDraw()
                return

        def OnDraw(self):
                glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
                if self.mode == RI:
                        self.drawRange()
                elif self.mode == PC:
                        self.drawCloud()

        def InitGL(self):
                glClearColor(0.0, 0.0, 0.0, 0.0);
                glClearDepth(1.0)
                glEnable(GL_DEPTH_TEST)
                glDepthFunc(GL_LEQUAL)
                glClear(GL_COLOR_BUFFER_BIT)

                glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
                glPixelStorei(GL_PACK_ALIGNMENT, 1)

                #NTSC colour scales...
                glPixelTransferf(GL_RED_SCALE, 0.299);
                glPixelTransferf(GL_GREEN_SCALE, 0.587);
                glPixelTransferf(GL_BLUE_SCALE, 0.114);

                glMatrixMode(GL_PROJECTION)
                glLoadIdentity()
                glOrtho(0.0,1.0,0,1.0,-1.0,1.0)
                glMatrixMode(GL_MODELVIEW)
                glLoadIdentity()

                return

        def rangeImage(self, image):

                glBindTexture(GL_TEXTURE_2D, self.texture)
                glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE )

                glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
                                                GL_LINEAR)
                glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
GL_LINEAR)
                glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT)
                glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT)

                # flatten it into a list so the OpenGL calls work
                n = NumpyHandler()
                fI = image.flatten()
                flatImage = n.dataPointer(n.contiguous(fI))

                print n.contiguous(fI)

                gluBuild2DMipmaps(GL_TEXTURE_2D, 1, image.shape[0]+1,
image.shape[1]+1,
                                                        GL_LUMINANCE,
GL_FLOAT, flatImage)
                self.mode = RI
                self.OnDraw()

        def drawRange(self):
                ''' Controls the actual drawing of the range image'''

                glMatrixMode(GL_MODELVIEW)
                glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)

                glColor3f(1.0,1.0,1.0)
                glEnable(GL_TEXTURE_2D)
                glBindTexture(GL_TEXTURE_2D, self.texture)
                glBegin(GL_TRIANGLE_FAN)
                glTexCoord2d(1,1); glVertex3f(0.0, 0.0, 0.0)
                glTexCoord2d(1,0); glVertex3f(0.0, 1.0, 0.0)
                glTexCoord2d(0,0); glVertex3f(1.0, 1.0, 0.0)
                glTexCoord2d(0,1); glVertex3f(1.0, 0.0, 0.0)
                glEnd()
                self.SwapBuffers()

--------end snippet-----------