Hi,
If you are using surfaceview I believe it does backbuffer flipping for
you
-niko
On Feb 1, 2:00 pm, Kevin Duffey <andjar...@gmail.com> wrote:
> Hey all, maybe I am way off base on this.. but I recall years ago messing
> around with writing data to an off-screen buffer, then "flipping" the buffer
> to video ram. I am guessing this is no longer done.. or is it? I thought the
> reason for that years ago was it was much faster to write multiple layers of
> a graphics scene, like side scrollers, even 3D scenes, in some off-screen
> vram (or even regular memory), then swap the whole thing to the video ram
> and doing that 30+ times a second yielded good performance. I apologize if
> this is not how it's done any longer.. just wondering if that is still an
> option and would help, or if that is so old school it's no longer ever done?
>
> On Mon, Feb 1, 2010 at 11:56 AM, Federico Carnales
> <fedecarna...@gmail.com>wrote:
>
>
>
> > Hi Guich,
>
> > I didn't do anything special to achieve 60fps with a SurfaceView, just
> > get a lock to the surface and draw the bitmap onto the canvas. Mind
> > you, I only get 60fps when drawing a static, full screen bitmap to the
> > SurfaceView. If I draw more bitmaps on top of that background bitmap,
> > the FPS goes down.
>
> > Regards,
>
> > Federico
>
> > On Feb 1, 12:29 pm, guich <guiha...@gmail.com> wrote:
> > > Hi Federico,
>
> > > I tried during weeks to get a working code for the opengles. The idea
> > > was to draw an offscreen bitmap into the screen (i do all the graphics
> > > rendering by myself). Then someone told me that using textures for
> > > this was not a good idea, because it takes time to make the texture
> > > get into the video card and then displayed.
>
> > > Since my knowledge of opengl is near 0, i gave up and used the
> > > SurfaceView approach. I also published the code here:
>
> > > This goes at surfaceChanged:
>
> > > sScreenBuff = ShortBuffer.allocate(w * h);
> > > sScreenBitmap = Bitmap.createBitmap(w, h,
> > > Bitmap.Config.RGB_565);
>
> > > And this is my updateScreen method:
>
> > > static void updateScreen()
> > > {
> > > try
> > > {
> > > if (sScreenBitmap == null)
> > > return;
> > > Canvas canvas = surfHolder.lockCanvas();
> > > if (canvas == null)
> > > return;
> > > instance.nativeOnDraw(sPixels); // call Native C code
> > > sScreenBuff.put(sPixels);
> > > sScreenBuff.rewind();
> > > sScreenBitmap.copyPixelsFromBuffer(sScreenBuff);
> > > canvas.drawBitmap(sScreenBitmap, 0, 0, null);
> > > surfHolder.unlockCanvasAndPost(canvas);
> > > }
> > > catch (Throwable t)
> > > {
> > > debug(Log.getStackTraceString(t));
> > > }
> > > }
>
> > > Have you done something different to achieve the 60fps?
>
> > > Btw, i can test your code in two devices, the G2 Ion and the Motorola
> > > Milestone (A853).
>
> > > thanks and regards,
>
> > > guich
>
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