FBOs

Hello list,

I am working with FBOs but am sadly running into some issues when
attempting to attach a 2D Texture to my FBO.

The problem I am having is that after setting everything up, when I call
the glCheckFramebufferStatus() function passing in GL_COLOR_ATTACHMENT0 as
a parameter, I get an "invalid enumerant" error.

Here's the shortest version of the code I could provide to trigger the
error:

import pygame
>
> from OpenGL.GL import *
>
> from OpenGL.GL.framebufferobjects import *
>
> import os
>
>
>> scr = pygame.display.set_mode((100,100), pygame.OPENGL)
>
> glClearColor(0.0,0.0,0.0,0.0)
>
> glClear(GL_COLOR_BUFFER_BIT)
>
> pygame.display.flip()
>
>
>> print "Renderer:"
>
> print glGetString(GL_VERSION), glGetString(GL_RENDERER)
>
> print os.uname()
>
>
>> tex_id = glGenTextures(1)
>
> glBindTexture(GL_TEXTURE_2D, tex_id)
>
> glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 512, 512, 0, GL_RGB,
>> GL_UNSIGNED_INT, None)
>
> glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
>
> glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
>
> glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE)
>
> glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE)
>
>
>> fbo_id = glGenFramebuffersEXT(1)
>
> glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo_id)
>
> glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
>> GL_TEXTURE_2D, tex_id, 0)
>
>
This is the line that triggers the error:


> assert (glCheckFramebufferStatusEXT(GL_COLOR_ATTACHMENT0_EXT) ==
>> GL_FRAMEBUFFER_STATUS_COMPLETE_EXT), "FBO creation failed!"
>
>
This is the output produced on my computer:

Renderer:
>
> 2.1 NVIDIA-1.6.36 NVIDIA GeForce 9600M GT OpenGL Engine
>
> ('Darwin', 'syaoran.local', '10.8.0', 'Darwin Kernel Version 10.8.0: Tue
>> Jun  7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386', 'i386')
>
> Traceback (most recent call last):
>
>   File "fbo.py", line 27, in <module>
>
>     assert (glCheckFramebufferStatusEXT(GL_COLOR_ATTACHMENT0_EXT) ==
>> GL_FRAMEBUFFER_STATUS_COMPLETE_EXT), "FBO creation failed!"
>
>   File
>> "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/OpenGL/platform/baseplatform.py",
>> line 335, in __call__
>
>     return self( *args, **named )
>
>   File "errorchecker.pyx", line 50, in
>> OpenGL_accelerate.errorchecker._ErrorChecker.glCheckError
>> (src/errorchecker.c:574)
>
> OpenGL.error.GLError: GLError(
>
>  err = 1280,
>
>  description = 'invalid enumerant',
>
>  baseOperation = glCheckFramebufferStatusEXT,
>
>  cArguments = (GL_COLOR_ATTACHMENT0_EXT,),
>
>  result = 0L
>
> )
>
>
>
Am I missing anything in the FBO creation code or am I bumping against a
bug in the OpenGL stack? I am not discarding this being a platform problem.

I have OpenGL 2.1 (so I am actually using the EXT version of the functions)
on Mac OS X 10.6 with an NVIDIA Geforce 9400m GPU.

Any help will be appreciated!

Best regards,
Alejandro.-

-- 
http://alejandrosegovia.net

------------------------------------------------------------------------------
Try before you buy = See our experts in action!
The most comprehensive online learning library for Microsoft developers
is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3,
Metro Style Apps, more. Free future releases when you subscribe now!
http://p.sf.net/sfu/learndevnow-dev2

_______________________________________________
PyOpenGL Homepage
http://pyopengl.sourceforge.net
_______________________________________________
PyOpenGL-Users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/pyopengl-users

import pygame
from OpenGL.GL import *
from OpenGL.GL.framebufferobjects import *
import os

scr = pygame.display.set_mode((100,100), pygame.OPENGL)
glClearColor(0.0,0.0,0.0,0.0)
glClear(GL_COLOR_BUFFER_BIT)
pygame.display.flip()

print "Renderer:"
print glGetString(GL_VERSION), glGetString(GL_RENDERER)
print os.uname()

tex_id = glGenTextures(1)
glBindTexture(GL_TEXTURE_2D, tex_id)
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 512, 512, 0, GL_RGB, GL_UNSIGNED_INT, None)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE)

fbo_id = glGenFramebuffersEXT(1)
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo_id)
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, tex_id, 0)

assert (glCheckFramebufferStatusEXT(GL_COLOR_ATTACHMENT0_EXT) == GL_FRAMEBUFFER_STATUS_COMPLETE_EXT), "FBO creation failed!"