[PyOpenGL-Users] Problem attaching Texture to FBO on intel GMA 45000MHD (error when calling glFramebufferTexture2DEXT)

[Thomas H. <tho...@gm...>]

Hi everyone,

I using PyOpenGL 3.0.1b2 on Windows 7 on a Dell XT 2 tablet PC
(http://www.dell.com/tablet). The tablet has a intel GMA  4500MHD
graphics chip with the newest drivers from intel installed. I'm having
problems creating a Framebuffer object using pyOpenGL.  The following
code runs fine on every machine I have access to except for this one.
I know the graphics chip has FBO support, and have successfully
compiled and run various C programs using FBO's.

The problem occurs when I call glFramebufferTexture2DEXT, to attach my
texture to the FBO.  The program crashes and prints a traceback with
GL error code 1286, which I believe is
INVALID_FRAMEBUFFER_OPERATION_EXT.

If anyone knows what I am doing wrong, has a workaround, or even just
a suggestion of identifying the problem better, I would be very
thankful.

I'm posting a code snippet and the output it produces.  I know teh
code isnt complete and nothing is actually done with the fbo etc.  but
its enough to crash the program, and demonstrates the first problem I
encounter on this machine.

The code:
=======================================================================
import pygame
from pygame.locals import *
from OpenGL.GL import *
from OpenGL.GL.EXT.framebuffer_object import *

def draw ():
   glClearColor(0.0,0.0,0.0,0.0)
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
   #draw stuff here
   pygame.display.flip()

pygame.init()
pygame.display.set_mode((512,512),OPENGL | DOUBLEBUF)

#setup a texture
tex = glGenTextures(1);
glBindTexture(GL_TEXTURE_2D, tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 512, 512, 0, GL_RGBA,
GL_UNSIGNED_BYTE, None);
glBindTexture(GL_TEXTURE_2D, 0);

#setup teh fbo
fbo = glGenFramebuffersEXT(1)
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo)
glBindTexture(GL_TEXTURE_2D, tex)

#this call produces an error!
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
GL_COLOR_ATTACHMENT0_EXT,GL_TEXTURE_2D, tex, 0)

while 1:
 event=pygame.event.poll ()
 if event.type is QUIT:
   sys.exit(0)
 draw()


Here is the output:
===================================================================
Traceback (most recent call last):
  File "test.py", line 29, in <module>
    glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
GL_COLOR_ATTACHMENT0_EXT,GL_TEXTURE_2D, tex, 0)
  File "C:\Python26\lib\site-packages\pyopengl-3.0.1b2-py2.6-win32.egg\OpenGL\platform\baseplatform.py",
line 335, in __call__
    return self( *args, **named )
  File "C:\Python26\lib\site-packages\pyopengl-3.0.1b2-py2.6-win32.egg\OpenGL\error.py",
line 208, in glCheckError
    baseOperation = baseOperation,
OpenGL.error.GLError: GLError(
	err = 1286,
	baseOperation = glFramebufferTexture2DEXT,
	cArguments = (
		GL_FRAMEBUFFER_EXT,
		GL_COLOR_ATTACHMENT0_EXT,
		GL_TEXTURE_2D,
		1L,
		0,
	)
)


Thanks alot!!

--
Thomas Hansen