Drawing direct to screen possible?

[Mike_g]

Is it possible NOT to draw to the back puffer but directly to the shown screen?
I wrote a simple fractal program and I want that the user can watch the fractal being drawed.

Thanks in advance for your help!

      - Mike -

[Schranz0r]

Use a Array to draw?!
Or a Viewport and update every frame?

[Moru]

USEASBMP should do what you want. Just before each showscreen you call this and it will not clear the background buffer from what you just drew on the backbuffer.

If you have other things like numbers or other text that you update, draw that after you call USEASBMP, then that will be erased before next update since USEASBMP saves what is on screen as a background picture and restores that every SHOWSCREEN, erasing the text you draw after USEASBMP.

If you want to clear the screen, use "BLACKSCREEN"

[spacefractal]

Uses a off buffer (createscreen), and draw your fractals to that, then draw that buffer to the screen.

[kanonet]

CLEARSCREEN -1 might be what you need.

[spacefractal]

that will clear the buffer, which he is not intesered in. but you should draw your fractals to a offbuffer and then draw that buffer to the onscreen as sprite. Its property the best way.

[Qedo]

like this?
ciao
Qedo

[Mike_g]

CLEARSCREEN -1 might be what you need.

This works fine for Windows, but when I compile to MacosX or Android and run the app only crap and flickering  is displayed on the screen.

Is there another way to do this, working on all platforms (especially Android)

           - Mike -

[Mike_g]

that will clear the buffer, which he is not intesered in. but you should draw your fractals to a offbuffer and then draw that buffer to the onscreen as sprite. Its property the best way.

This is working well on all platforms - thank you!

         - Mike -

[kanonet]

If you have problems with CLEARSCREEN -1 on some platforms, then this may be a bug in GLB? Im not sure about this, can someone help?