USEASBMP on iPhone

[ampos]

I am making a program where snow falls from the sky. Each snow-bit is a pixel. Pixels on the floor stand there forever.

I use a matrix to store pixels on the floor, so each frame all floor-pixels are drawn (tested with SETPIXEX and DRAWSPRITE, no speed differences).

The problem is that when there is a lot (and I mean around 5000) pixels "dying in the sun", the game go sloooooow on iphone.

I did this program decades ago on my Amiga (in assembler!) and I did paint the pixels directly on the front buffer, so no extra-drawn per frame was necessary.

is there a way to paint directly in the frontbuffer in GLB?

If not, another solution is to do a USEASBMP each fps. Will be GLB4iphone enough fast? Only in vertical? (I am making it horizontal).

Someone gets and idea about how to do that?

Thx guys.

(on my PC I got 500 fps, on iphone 10-15)

[Ian Price]

You can use USESCREEN to save permanent (settled) snowflakes/sprites to, then display that screen as the background. I'm doing something similar in my current iPhod project.

Don't forget you need to create a virtualscreen first with CREATESCREEN #,Sprite#,width,height.

Are you working on an app for Christmas by any chance?

[ampos]

Not, it was just a quick/dirty app for the appstore, just to try how many units at $1 can I sell 

In fact, it is not snow but sand... well, colored pixels. It is named "Sandscape"

Would love to save images to camera-roll...

[ampos]

Then it should be something like this?

Code (glbasic) Select Expand

createscreen 0,sp,480,320
repeat
   usescreen 0
   draw new background sand //sand that touch the floor after falling...
   usescreen -1
   drawsprite sp,0,0
   draw falling sand
   showscreen
forever

[Ian Price]

Yep.

[Kitty Hello]

for sand, why not calculate the pixel ina DIM and use MEM2SPRITE?