You already ported it?

But why is there the border at the top of the screen? Is it in Lua instead of C++? How fast does it run btw?

Also if someone made a vid of calc demos, the following song would fit really well

As I mentioned, I ported it to Lua ^^
I havent tested it on a handheld, but I presume very slow.

Most of the work is in the setup phase (setup() in the Processing version, InitTables() in the C++ version). And the C++ version could use the optimizations I described above, if not more (for instance, if we have enough room on the stack, then we can even put the arrays of floats used in InitTables() on the stack, no need for new + delete later).

How about a port of tempest2000 with this in the background changing hue?

Would you be able to describe precisely how it works ?

I suppose, but if you stare long enough at the code you will see that it isn't so complex.

Alright, for those who are interested here is my Lua code
local reg  = {}
local wormImg
local width, height

local wormTexture = {
0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,
0x7fab,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x7fab,
0x7fab,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x7fab,
0x7fab,0x3F53,0x3F53,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x3F53,0x3F53,0x7fab,
0x7fab,0x3F53,0x3F53,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x3F53,0x3F53,0x7fab,
0x7fab,0x3F53,0x3F53,0x1f2b,0x1f2b,0,0,0,0,0,0x1f2b,0x1f2b,0x3F53,0x3F53,0x7fab,
0x7fab,0x3F53,0x3F53,0x1f2b,0x1f2b,0,0,0,0,0,0x1f2b,0x1f2b,0x3F53,0x3F53,0x7fab,
0x7fab,0x3F53,0x3F53,0x1f2b,0x1f2b,0,0,0,0,0,0x1f2b,0x1f2b,0x3F53,0x3F53,0x7fab,
0x7fab,0x3F53,0x3F53,0x1f2b,0x1f2b,0,0,0,0,0,0x1f2b,0x1f2b,0x3F53,0x3F53,0x7fab,
0x7fab,0x3F53,0x3F53,0x1f2b,0x1f2b,0,0,0,0,0,0x1f2b,0x1f2b,0x3F53,0x3F53,0x7fab,
0x7fab,0x3F53,0x3F53,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x3F53,0x3F53,0x7fab,
0x7fab,0x3F53,0x3F53,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x1f2b,0x3F53,0x3F53,0x7fab,
0x7fab,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x7fab,
0x7fab,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x3F53,0x7fab,
0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab,0x7fab
}


function on.construction()
  width = 338/2
  height = 212/2
  wormImg = {}
 
  local tsize = 15
  local width, height = width, height
  local wormImg = wormImg

  local SPOKES = 1200
  local spokeCalc = {}
  local spokeCosCalc = {}
  local spokeSinCalc = {}

  local x,y,z
  local divCalcX,divCalcY = 0,0
  local sin, cos, log, floor = math.sin, math.cos, math.log, math.floor

  local XCENTER = floor(width/2)
  local YCENTER = floor(height/2 - height/4)
  local DIVS = SPOKES/2

  for i=1, SPOKES do
    local n = 2*math.pi*i/SPOKES
    spokeCalc[i] = n
    spokeCosCalc[i] = cos(n)
    spokeSinCalc[i] = sin(n)
  end
 
  local incW = width/DIVS
  local incH = height/DIVS
 
  for j=1, SPOKES, 2 do
    z = log(j/DIVS)*25-25
    divCalcX = divCalcX + incW
    divCalcY = divCalcY + incH
    for i=1, SPOKES do
      x = floor(divCalcX*spokeCosCalc[i]) + XCENTER
      y = floor(divCalcY*spokeSinCalc[i]  - z ) + YCENTER

      if x>=0 and x<=width and y>=0 and y<=height then
        if not wormImg[y] then wormImg[y] = {} end
        wormImg[y][x] = 1 + floor(i/8)%tsize + tsize*(floor(j/12)%tsize)
      end
    end
  end
 
  timer.start(0.05)
end

local function shiftup()
    local wormTexture = wormTexture
    local reg=reg
   
    for k=1, 15 do
      reg[k]=wormTexture[k]
    end
    for k=16, 15*15  do
      wormTexture[k-15]=wormTexture[k] -- +1 for C to Lua
    end
    for k=1,15 do
      wormTexture[k+210]=reg[k]
    end
end

local function shiftright()
    local wormTexture = wormTexture
    local last
   
    for k=0, 14 do
      last=wormTexture[15*k+15]
      for i=15, 2, -1 do
        wormTexture[15*k+i]=wormTexture[15*k+(i-1)]
      end
      wormTexture[15*k + 1]=last
    end
end

--count=0
function on.paint(gc)
  local wormTexture = wormTexture
  local wormImg = wormImg
  local height, width= height-1, width-1
  local pos=0
  for y=0, height do
    local yy=wormImg[y]
    for x=0, width do
        pos=pos+1
        gc:setColorRGB(wormTexture[yy[x]])
        gc:fillRect(x*2, y*2, 2, 2)
        --gc:fillRect(x, y, 1, 1)
    end
  end
  --count=count+1
  --gc:setColorRGB(0xFF00FF)
  --gc:drawString(""..count, 100, 100, "top")
end

function on.timer()
  shiftup()
  shiftright()
 
  platform.window:invalidate()
end

I halved the resolution and amount of spokes so that it actually can run on your handheld. Of course speed will not be awesome, but it does run. Keep in mind that launching takes some time (as it then generates the swirl 'lookup' image).

Also, I changed and removed parts that aren't necessary for it to run. For example I completely removed wormTexture2 as that's only need for smooth transition to another texture and wormEffect because there is no reason in storing it.

Now, if TI only would give us some proper way to have a graphics buffer, this could run at a very decent speed

Aaaaaaand ... success !

Look at it running, it's so cute (thanks nSDL)

Binaries and source attached (I changed some things but didn't bother too much with optimization).

It takes 5 seconds to start, and after that runs smoothly with a small artefact at the bottom of the screen (hit [esc] to quit). If someone can see where it's coming from in the source code ...

In fact, the tunnel and the wormhole already use the same technique → precompute a LUT for the whole screen and shift a texture afterwards. And moving the hole would require computing the whole screen each iteration, which would be awfully slow (computing it only once takes the 5 seconds I've talked about).

That looks really cool! What would be nice is some sort of space shooter where you have to shoot whatever is coming out of the hole before it reaches the sides but I bet that would be kinda hard to code even if the tunnel hole didn't move.