Re: [PyOpenGL-Users] glTexSubImage2D data format

[Gijs <in...@bs...>]

On 11/10/09 19:15 , Mohan Ganesalingam wrote:
> Hi Gijs,
>
>    
>> I usually use Numpy arrays for calls like this. So something like this:
>> data = zeros(width*height, 'f')+0.5
>> glTexSubImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, 0, 0, width, height,
>> GL_LUMINANCE, GL_FLOAT, data)
>>      
> Thanks for the suggestion! Unfortunately I'm still getting an error... I'm
> sure I'm doing something stupid, but would you mind taking a look at it? (I
> can post the complete source code as well, but it's>100 lines, so I'm not
> sure whether it's all right to send it to the list... )
>
> thanks again,
> Mohan
>
> Error:
>
> Traceback (most recent call last):
>    File "C:\Mohan\pygpu\test.py", line 110, in<module>
>      glTexSubImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, 0, 0, width, height,
> GL_LUMINAN CE, GL_FLOAT, data)
>    File "C:\Program
> Files\_Coding\Python26\lib\site-packages\OpenGL\wrapper.py", line 1284, in
> __call__
>      return self.finalise()( *args, **named )
>    File "C:\Program
> Files\_Coding\Python26\lib\site-packages\OpenGL\wrapper.py", line 681, in
> wrapperCall
>      raise err
> OpenGL.error.GLError: GLError(
>          err = 1281,
>          description = 'invalid value',
>          baseOperation = glTexSubImage2D,
>          pyArgs = (
>                  GL_TEXTURE_RECTANGLE_ARB,
>                  0,
>                  0,
>                  0,
>                  512,
>                  512,
>                  GL_LUMINANCE,
>                  GL_FLOAT,
>                  array([ 0.30000001,  0.30000001,  0.3...,
>          ),
>          cArgs = (
>                  GL_TEXTURE_RECTANGLE_ARB,
>                  0,
>                  0,
>                  0,
>                  512,
>                  512,
>                  GL_LUMINANCE,
>                  GL_FLOAT,
>                  array([ 0.30000001,  0.30000001,  0.3...,
>          ),
>          cArguments = (
>                  GL_TEXTURE_RECTANGLE_ARB,
>                  0,
>                  0,
>                  0,
>                  512,
>                  512,
>                  GL_LUMINANCE,
>                  GL_FLOAT,
>                  c_void_p(90243104),
>          )
> )
>
>
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
> trial. Simplify your report design, integration and deployment - and focus on
> what you do best, core application coding. Discover what's new with
> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
> _______________________________________________
> PyOpenGL Homepage
> http://pyopengl.sourceforge.net
> _______________________________________________
> PyOpenGL-Users mailing list
> PyO...@li...
> https://lists.sourceforge.net/lists/listinfo/pyopengl-users
>    
After reviewing your code it appeared that you didn't first set the 
texture format/width/height/etc, using glTexImage2D. You first have to 
define this before you do something with it, for instance call 
glTexSubImage2D on it. This can be done using the following code:
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_LUMINANCE, width, height, 
0, GL_LUMINANCE, GL_FLOAT, zeros(width*height, 'f'))

Regards, Gijs