Sending user data to draw loops about nuklear HOT 3 CLOSED

Hey and thanks for the issue,

Would it be possible to append a zr_handle user_data to struct zr_context, struct zr_draw_command and struct zr_command. The handling could be similar to zr_set_font.

Do you mean same the userdata for zr_context, zr_draw_command and zr_command or each having their own? Other than that I don't see a problem of adding it per se but it will blow up the memory consumption for zr_command and to some extend in zr_draw_command as well. So if I will add userdata to zr_command and zr_draw_command I will also add defines to make sure not everyone has to pay for the additional costs.
But can I ask for what this is needed? I thought I made everything abstract enough so that you only need the zr_context struct to draw everything?

from nuklear.

or each having their own?

No, no, one for them all would be enough, just like setting a font.

But can I ask for what this is needed?

Imagine one wants to draw a bunch of buttons each using a different shader:

for (i = buttonCount; i > 0; i -= 1) {
    zr_set_userdata(context, (zr_handle)shader_for_button(i));
    do_button(i);
    zr_set_userdata(context, (zr_handle)default_shader);
    do_decoration(...);
}

And in the draw loop:

zr_draw_foreach(cmd, context, &cmds)  {
   shader = (shader_id)cmd->user_data; 
   bind_shader(shader);
   draw_elements(...);
   ...
}

I will also add defines to make sure not everyone

That would be perfect!

from nuklear.

I actually think it's worth adding, because tracking the data outside of the draw list would be too cumbersome. So I agree with making it conditional and adding it's use into demos.

from nuklear.