Re: [PyOpenGL-Users] textures from image files

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

On 5-1-2010 9:57, Jef Mangelschots wrote:
> PIL 1.1.6 supposedly has a module name ImageGL to convert image files 
> to OpenGL textures.
> This somehow does not work for me for lack of the _imaginggl module.
> This is supposedly part of imToolkit according to the comment but 
> google never heard of it.
>
> How can I convert image files (e.g. JPG) to PyOpenGL textures ?
> can I do it with PIL (if so, how) or do I need something else ?
>
> Jef
Hello Jef,

I am using the following function to load PNG files into OpenGL using PIL:
def initPixelData(filename, tex_type = GL_TEXTURE_RECTANGLE_ARB):
   img = Image.open(filename)
   pixels = array(img.getdata(), 'B')
   w, h = img.size
   pixels = pixels[::-1].ravel()  # -> pixels.reverse()

   # this probably does not always work, but at least it works for RGB 
and RGBA
   exec("mode = GL_"+img.mode)

   # Create texture / set texture parameters / put the data into the 
texture / disable texture and return
   texid = int(glGenTextures(1))
   glActiveTexture(GL_TEXTURE0)
   glEnable(tex_type)
   glBindTexture(tex_type, texid)
   glTexParameterf(tex_type, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
   glTexParameterf(tex_type, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
   glTexImage2D(tex_type, 0, GL_RGB, w, h, 0, GL_RGB, GL_UNSIGNED_BYTE, 
pixels)
   glBindTexture(tex_type, 0)

   return texid, w, h

You might have to alter it a bit, depending on the type of your images, 
but it should give you a general idea how to do it.

Regards, Gijs