Hi,
I’m trying to load a PNG file into an OpenGL texture using
ruby-libpng-0.3.3
I can’t quite figure out how to convert libpng data to the correct
format.
I’ve dumped png.read_image to screen and it looks like my picture (with
numbers instead of colors). At the moment I’m trying to use this index
as my Red index (just to get something displaying) but am getting a
white square instead. I’m already using textures for fonts, so I know
that bit works.
Any Ideas?
As an aside, if anyone has a better x-platform way of doing this I’m all
ears…
- Xavier
Load a test png
rpng = Reader.new(‘res/img/test.png’);
width, height, bit_depth, color_type,
interlace_type, compression_type, filter_type = rpng.get_IHDR
puts width # 20#for i in (0…height)
buffer += data[i].pack(“C*”)
#end
puts height # 20
puts bit_depth # 8
puts color_type # 6 … not sure what this means yet
#for i in (0…height)
buffer += data[i].pack(“C*”)
#end
Create and bind to OGL texture
@testogl = GL::GenTextures(1)[0];
GL.BindTexture(GL::TEXTURE_2D, @testogl);
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::LINEAR);
GL.TexParameteri(GL::TEXTURE_2D, GL::TEXTURE_MIN_FILTER,GL::LINEAR);
Abomination follows
data = rpng.read_image
data2 = data.flatten
data3 = “”
for i in (0…data2.length-1)
data3 += " "
data3[i] = data2[i]
end
GL.TexImage2D(GL::TEXTURE_2D, 0, GL::RED, width,
height, 0, GL::RED, GL::UNSIGNED_BYTE, data);