How do groundSquare work?

[Google_Frog]

https://github.com/spring/spring/commit ... 63e57f3aca

It's great that some form of texture changing was added, but how does it work?

Code: Select all

function widget:Initialize()
    Spring.Echo(Spring.SetMapSquareTexture(800,800,'LuaUI/Images/test.png'))
end

Echos false.

Code: Select all

function widget:DrawWorldPreUnit()
    gl.Texture('LuaUI/Images/test.png' )
    gl.DrawGroundQuad(0,0,300,300)
end

Confirms that the texture is loaded and found.

test.png is an 8x8 white square.

[FLOZi]

Try calling gl.Texture before you call SetMap... ?

[Google_Frog]

From the content of the commits it looks like the function isn't suppose to be used in DrawWorld.

[FLOZi]

Did I suggest that it was?

All of this is mere conjecture of course.

I am become Argh, destroyer of dev threads

[smoth]

Nooooooo!


So all joking aside what does this do

[Kloot]

1) "How do groundSquare work?" ?
2) learn from example: http://pastebin.com/EUHyzZLE
3) there is a third way to use these callouts, but it requires advanced knowledge of (Lua)OpenGL

[FLOZi]

Nooooooo!


So all joking aside what does this do

Screenshot of kloots example widget:

[FLOZi]

<snip>

[Google_Frog]

Thanks, the example widget is good. One more question; is there a significant performance difference between creating lots of little groundSquares instead of a few big ones?

(Also, groundSquares, I think I'm allowed the occasional typo)

[Kloot]

The widget doesn't create ground squares, it re-textures existing ones. They have a fixed size (1024x1024 elmos) because of how the map format and renderer are designed, so performance is not a factor you can control or should be concerned about.

[FLOZi]

Is it possible to do the following in lua:

Get the original map ground square texture
replace a subsection of that square texture with your own texture
apply new texture to the ground square

Also, is it possible have 1 bit transparency on these textures?


Even without being able to do the former; This should allow to make a single heightfield with multiple texture/feature climates.

[Kloot]

1) yes, but falls under the "advanced knowledge" category
2) nope, no transparency without setting voidwater (yet)