Re: [PyOpenGL-Users] glTexSubImage2D data format

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

On 10-11-2009 18:07, Mohan Ganesalingam wrote:
> Hi,
>
> I'm trying to port some very elementary GPGPU code (based on
> http://www.mathematik.uni-dortmund.de/~goeddeke/gpgpu/tutorial.html) to run
> with Python(+PyOpenGL+pygame). I'm running into some difficulties
> translating the following line...
>
> glTexSubImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, 0, 0, width, height,
> GL_LUMINANCE, GL_FLOAT, data)
>
> I think the problem is that I don't have 'data' in the right format. (I've
> tried several things, including arrays and strings. In the original C code
> it's just a float*.) Would anyone be able to tell me what the appropriate
> format in Python would be?
>
> Thank you in advance,
> Mohan
>
Hi Mohan,

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)

This should give all your texels a value of 0.5.

Regards,
Gijs