Eoin wrote:
> Erco's code shows how to apply texture maps but I can't see
> how to load them from images.
Here's a snazzed up version of Ian's rework of my old example:
Screenshot:
http://seriss.com/people/erco/fltk/image-texturemapped-cube.png
Code:
http://seriss.com/people/erco/fltk/image-texturemapped-cube.cxx
I added a lighting model and materials so that the texture
reacts to lighting.
I also simplified Ian's texture loading code a bit;
as it happens, Fl_Shared_Image's internal rgb format is compatible
with opengl's glTexImage2D() call, so the x/y loop and extra image
buffer could be removed.
This simplified the texture map loading code to essentially just
two simple lines:
---- snip
Fl_Shared_Image *img = Fl_Shared_Image::get(filename);
/* ..error checking snipped.. */
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img->w(), img->h(), 0, GL_RGB,
GL_UNSIGNED_BYTE, img->data()[0]);
---- snip
..which loads the image and assigns the texture.
To get the lighting model to work, I had to replace Loic's
cube definition with a cube from one of SGI's example programs
that included pre-computed normals. (Without the correct normals,
it made it look like the light was moving around, even though
it was stationary..!)
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