Hi Neil,
I have done like this but I am not getting masking in my program.
Code Snippet:In the loading image
Load_Image()
{
gchar **files;
files = g_new (gchar*, 1);
files[0] = g_build_filename ("/home/rakeshk4/Development/Pictureflow/",
"Dummy_Alpha_Path.png", NULL);
//path I am geeting from argument
ClutterActor *actor = clutter_texture_new_from_file (path, NULL);
CoglHandle alpha_mask_texture = cogl_texture_new_from_file
(files[0],COGL_TEXTURE_NONE, COGL_PIXEL_FORMAT_ANY,&error);
Coglhandle material = clutter_texture_get_cogl_texture (CLUTTER_TEXTURE
(actor));
cogl_material_set_layer (material, 1, alpha_mask_texture);
cogl_material_set_layer_combine (material, 1,
"RGBA = MODULATE (PREVIOUS, TEXTURE)",
&error);
I am getting this warning meassage:
cogl_material_set_layer_combine: assertion `cogl_is_material (handle)'failed
I am using this sample.
http://github.com/pmarti/clutter-tutorial/tree/50679e5eb5ebeb9cbfaab99ceacd9e85deabf3bb/examples/full_example
Regards,
RK
Hi
Rakesh Kumar <rakesh.ku...@kpitcummins.com> wrote:
> I have two texture one is rectangular texture and other one contains
> alpha texture that is non rectangular texture ,from this i would like
> to mask two texture and create new shape texture. How we can do this
> in clutter.
You should be able to do this with a custom material on a ClutterTexture
using multi-texturing. Assuming you have your alpha mask texture in a
CoglHandle and your base texture in a ClutterTexture you can do
something like this:
ClutterActor *base_texture = ...;
CoglHandle alpha_mask_texture = ...;
CoglHandle material;
/* Get the material from the Clutter texture */
material =
clutter_texture_get_cogl_texture (CLUTTER_TEXTURE (base_texture));
/* Add the alpha mask as a second texture layer */
cogl_material_set_layer (material, 1, alpha_mask_texture);
/* Set the combine function so that the base texture is modulated by the
alpha component of the mask texture */
cogl_material_set_layer_combine (material, 1,
"RGBA = MODULATE (PREVIOUS, TEXTURE[A])",
NULL);
If you need picking to work as well then you would need to subclass
ClutterTextue and override the pick method so that it draws a solid
rectangle masked by the alpha texture in a similar way.
You may want to take a look at Mutter¹ which does a similar thing to
support shaped windows.
- Neil
¹ http://ho.io/ck29
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