Spring RTS Engine

I have a gadget and a widget that both use a texture that is made by copying the screen. I wish to avoid doing the copy operation twice. Can this be done?

You could try _G (http://springrts.com/wiki/Lua_sync_to_unsync) but I'm not sure what the limitations on how much data can be sent around at once like that are.

A texture is just a handle to a gl int as far as I know, so that might work. Ill try it :)

If that worked it would be a bug. It would mean you could change any gadget's texture from a widget.

Yay, it can be done!

!56 = lua generated texture 56 (= return value of gl.CreateTexture)

If that worked it would be a bug. It would mean you could change any gadget's texture from a widget.

_G (amongst other ways) lets you to do stuff in synced and have it visible to unsynced.

Silentwings wrote: _G (amongst other ways) lets you to do stuff in synced and have it visible to unsynced.

Yes and the point is you don't even need _G to 'transfer' textures (as they're just gl ints). Also this isn't just synced<->unsynced gadget communication (both between 'trusted' code), rather it's gadget<-> widget communication.

OTOH, if you think users have the full right to decide what gets rendered on their screen, it's fine.

Beherith wrote:Yay, it can be done!

!56 = lua generated texture 56 (= return value of gl.CreateTexture)

No.
Yes gl.CreateTexture returns a native type (string iirc) but this is only valid in the specific lua instance.

if you want to share a screencopy try:
1. setup render enviroment & bind texture in LuaRules
2. call Script.LuaUI.Foobar()
3. render in LuaUI
4. then finish everything in LuaRules

If I did it between widgets only, would it work there?

why shouldn't it?

gajop wrote:Yes and the point is you don't even need _G to 'transfer' textures (as they're just gl ints).

I don't think so (and maybe this is also what jK is saying) - I don't know if its enough just to transfer the gl int because maybe that int is only valid within the lua state in which it was created.