From: Alexandro Kez <alexandro.mail@...>
Date: 2009-12-08T01:05:07+09:00
Subject: Re: Reading Images


Ok, here's the code. I'm just trying to load it and put on a quad. 500 
and 500 are the original width and height of pic.

   name = GL.GenTextures(1);

   data = File.open("grass.jpg", "rb") {|io| io.read}

   GL.PixelStorei(GL::UNPACK_ALIGNMENT, 1);

   GL.BindTexture(GL::TEXTURE_2D, name[0]);

   GL.TexParameteri(GL::TEXTURE_2D, GL::TEXTURE_WRAP_S, GL::CLAMP);
   GL.TexParameteri(GL::TEXTURE_2D, GL::TEXTURE_WRAP_T, GL::CLAMP);
   GL.TexParameteri(GL::TEXTURE_2D, GL::TEXTURE_MAG_FILTER,GL::NEAREST);
   GL.TexParameteri(GL::TEXTURE_2D, GL::TEXTURE_MIN_FILTER,GL::NEAREST);
   GL.TexImage2D(GL::TEXTURE_2D, 0, GL::RGBA, 500,
    500, 0, GL::RGBA, GL::UNSIGNED_BYTE,
                data.unpack("C*"));


    GL.BindTexture(GL::TEXTURE_2D,name[0]);
    GL.Begin(GL::QUADS);
    GL.TexCoord(0.0, 0.0); GL.Vertex(-20.0, 0.0, -20.0);
    GL.TexCoord(0.0, 1.0); GL.Vertex(-20.0, 0.0, 20.0 );
    GL.TexCoord(1.0, 1.0); GL.Vertex(20.0, 0.0, 20.0 );
    GL.TexCoord(1.0, 0.0); GL.Vertex(20.0, 0.0, -20.0 );
    GL.End();



The error I get:
Length of specified data doesn't correspond to format and type 
parameters passed. Calculated length: 1000000 (ArgumentError)

As I think it may be due to the fact it contains more data, like width 
and height in itself and the datatypes, just don't get it. By the way, 
if I read it, it's still a string, why? Why do I have to pack/unpack?
thanks to every respond
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