pyopengl-users

[PyOpenGL-Users] glTexCoordPointer

[Sean R. <mrr...@ya...>]

Hello,

I can't get glTexCoordPointer to work in PyOpenGL. I have tried every
variation of it and parameters to it and setup states, but I always get this
error:

$ python texcoords.py
Traceback (most recent call last):
  File "texcoords.py", line 15, in display
    glTexCoordPointerf(texcoords)
OpenGL.GL.GLerror: [Errno 1282] invalid operation


Here is a simple program that demonstrates it in action.

#--------------- begin code ------------------------
import sys

from OpenGL.GL import *
from OpenGL.GLUT import *

points = [ (100,100), (200,100), (200,200), (100,200) ]
indicies = (0,1,2,3)
texcoords = [ (0.0, 0.0), (1.0, 0.0), (1.0, 1.0), (0.0, 1.0) ]


def display():
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)

    glVertexPointerf(points)
    glTexCoordPointerf(texcoords)
    glDrawElements( GL_QUADS, indicies)

    glutSwapBuffers()

glutInit(sys.argv)
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_ALPHA | GLUT_DEPTH)
glutInitWindowSize(400,400)
glutCreateWindow('texcoords')
glOrtho(0,400,0,400,0,1)

glutDisplayFunc(display)
glutMainLoop()

#--------------- end code ------------------------

Has anyone else actually gotten this funationality to work? It is not used
at all in the examples provided with the distribution.


---------------------------------
"I'm not as interested in being witty as I am in being clear", Scott Meyers
Sean Riley
MrR...@ya...

[PyOpenGL-Users] OpenGLContext vrml source?

[<il...@ya...>]

Hi,

trying to install OpenGLContext today, and it gives me
a message.

"Unable to find the vrml package's source in either
../vrml or ./vrml! cannot install!"

Where can I get it?

this is with the cvs version.

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Re: [PyOpenGL-Users] glTexCoordPointer

[Mike C. F. <mcf...@ro...>]

Your code works (though it doesn't actually use the tex coords) on 
2.0.1.04 (CVS) version of PyOpenGL.  You can find lots of samples of 
glTexCoordPointer in OpenGLContext (though normally the d, rather than 
the f variant).  Here's a sample of use from the indexedpolygons 
geometry node:

    def _enableTextures( self ):
        """Enable the normal array if possible"""
        tex = self.texCoord
        if tex:
            tex = tex.point
            if tex:
                glTexCoordPointerd( tex )
                glEnableClientState( GL_TEXTURE_COORD_ARRAY )
                return 1

Note: had to change the drawing line in your code to:
    glDrawElementsui( GL_QUADS, indicies)
but since that's after the error you were seeing I doubt that was the 
problem.

I'm assuming you've moved on since this email (it's been sitting in my 
"should check out what's going on here pile" for too long, sorry about 
that), if not, let me know and I'll put it back in the hopper.

Enjoy,
Mike

Sean Riley wrote:

>Hello,
>
>I can't get glTexCoordPointer to work in PyOpenGL. I have tried every
>variation of it and parameters to it and setup states, but I always get this
>error:
>
>$ python texcoords.py
>Traceback (most recent call last):
>  File "texcoords.py", line 15, in display
>    glTexCoordPointerf(texcoords)
>OpenGL.GL.GLerror: [Errno 1282] invalid operation
>
>
>Here is a simple program that demonstrates it in action.
>
>#--------------- begin code ------------------------
>import sys
>
>from OpenGL.GL import *
>from OpenGL.GLUT import *
>
>points = [ (100,100), (200,100), (200,200), (100,200) ]
>indicies = (0,1,2,3)
>texcoords = [ (0.0, 0.0), (1.0, 0.0), (1.0, 1.0), (0.0, 1.0) ]
>
>
>def display():
>    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
>
>    glVertexPointerf(points)
>    glTexCoordPointerf(texcoords)
>    glDrawElements( GL_QUADS, indicies)
>
>    glutSwapBuffers()
>
>glutInit(sys.argv)
>glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_ALPHA | GLUT_DEPTH)
>glutInitWindowSize(400,400)
>glutCreateWindow('texcoords')
>glOrtho(0,400,0,400,0,1)
>
>glutDisplayFunc(display)
>glutMainLoop()
>
>#--------------- end code ------------------------
>
>Has anyone else actually gotten this funationality to work? It is not used
>at all in the examples provided with the distribution.
>  
>
...

_______________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://members.rogers.com/mcfletch/