jit.gl.lua RTT

Thijs Koerselman

Hi,

I'm trying to use RTT with jit.gl.lua, but it doesn't seem to be working. I
figured a good start would be the RTT.capture example patch that comes with
jit.gl.lua. On my system the window stays black. I don't see anything.
Selecting the backend, FBO gives me the following errors:

jit.gl.fbo: unsupported framebuffer format!
jit.gl.fbo: error updating framebuffer attachment!

For the RTT backend there are no errors, but still the output is empty. I've
also tried the RTT.slab example. This one doesn't work either but odly the
fbo backend doesn't generate errors in this patch. Both backend options
just show a black screen.

I'm using the latest max/jitter/jit.gl.lua on an intel mac running
10.5.2with an NVidia 7300GT

Any ideas?

I'm already trying this as an alternative to the accum buffer which I failed
to get working. I'm running out of options.

Cheers,
Thijs

Wesley Smith

Here's the most trivial RTT example. If this doesn't work then
something is out of whack.:

Max Patch

Copy patch and select New From Clipboard in Max.

Script----------------------------------------------

local scene = jit.new("jit.gl.texture", this.drawto)
local vplane = jit.new("jit.gl.videoplane", this.drawto)
vplane.transform_reset = 2
vplane.automatic = 0
vplane.texture = scene.name

function draw()
    jit.gl.begincapture(scene.name, 0)
        gl.Begin("TRIANGLES")
            gl.Vertex(-1, 0, 0)
            gl.Vertex(0, 1, 0)
            gl.Vertex(1, 0, 0)
        gl.End()
    jit.gl.endcapture(scene.name, 0)

vplane:draw()
end

Thijs Koerselman

On Thu, Mar 13, 2008 at 9:31 PM, Wesley Smith wrote:

> Here's the most trivial RTT example. If this doesn't work then
> something is out of whack.:
>
>
Thanks Wes, it appears to work. At least for the RTT backend. FBO still
generates the same errors I reported earlier. I tried to find where the
difference is and the problem appears to be the slab. If I take out the slab
from RTT.capture.lua.demo then the patch works. If I use the slab, I see
only the first frame (without effect) and then the screen goes black. I can
see the first frame again by reloading the lua file.

I tried co.inverse.jxs instead of wobble, but the output is the same. Any
more tests I could do related to the slab issue?

Btw, is FBO going to give a lot better performance over RTT?

Cheers,
Thijs