Hello,
I am trying to upload a PixBuf to an OpenGL texture. I want it to be as
optimized as possible. Of course, I'll first need to get it work
properly, but I also want it to be quick, since I will upload one to a
texture on every frame rendering of my application. What is the best way
to do so?
Right now, I have something like this:
pixels = buffer.get_pixels()
w = image.get_width() # 320
h = image.get_height() # 240
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, texture_id)
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGB, w, h, 0,
GL_RGB, GL_UNSIGNED_BYTE, pixels)
glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST)
glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST)
My example is not quite working yet, (see
http://bitbucket.org/aalex/toonplayer/src/tip/scripts/gl-pixbuf.py ) but
I am working to get it OK. I am worried, though, that converting a
PixBuf to a Python string will slow things down a lot. Maybe should I
use gtk.gdk.PixBuf.get_pixels_array() instead of get_pixels()? But
still, will that be quick enough? The most optimized thing to do would
be to create a C function that would look like this:
void pixbuf_to_texture(int w, int h, GdkPixBuf buffer)
{
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, 3, w, h, 0, GL_RGB,
GL_UNSIGNED_BYTE, gdk_pixbuf_get_pixels(buffer));
}
Does anyone have advices regarding this issue?
Thanks a lot !
Alexandre Quessy
http://alexandre.quessy.net
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