[Image-SIG] Using PIL for background display in OGL/Python

python at bnardone.com python at bnardone.com
Fri Jan 28 17:16:19 CET 2005

Ok, that's what I'm doing currently, but was (obviously mis-) informed that
glDrawPixels would be faster.

Thanks a lot for your quick response.


On Fri, 28 Jan 2005 16:58 , Bob Ippolito <bob at redivi.com> sent:

>On Jan 28, 2005, at 12:26, python at bnardone.com> wrote:
>> I've just begun working OGL with Python and had a question about PIL.
>> Specifically, I've been using it to load .png's as textures, and now 
>> have a need
>> to draw other images (.jpg, .png) as background images. I'm interested 
>> in using
>> something along the lines of:
>> glPixelStorei(GL_UNPACK_ALIGNMENT,4);
>> glRasterPos2i(0,600)
>> glDrawPixels(800,600,GL_RGBA,*someBitmapSet*)
>> But I am unsure as to how to get the *someBitmapSet* out of the object 
>> returned by
>> someImage.tostring("raw", "RGBA", 0, -1)
>> image = numarray.array(numarray.fromstring(image, numarray.Byte))
>> I've tried
>> glDrawPixels(800,600,GL_RGBA,GL_UNSIGNED_BYTE,image)
>> to no avail.
>> Is this possible? Am I headed in the right direction?
>You shouldn't be using glDrawPixels.. it's almost always slow.  You 
>want to draw it to a texture, and then render the texture to a rect.  
>There are examples out there for getting a PIL image into an OpenGL 
>texture, but I can't think of anything off the top of my head.

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