Droid has dedicated video ram I believe. Not sure about other devices. I would guess the Nexus One does as well.
On Sun, Jan 31, 2010 at 9:54 AM, Federico Carnales <[email protected]>wrote: > Hi Robert, > > I'm using GLSurfaceView. I checked GL_DEPTH_BITS and indeed I have a > 24 bit depth buffer. > > Since you have a Droid, could you do me a favor? Could you make a > simple app with nothing but a GLSurfaceView, load a 1024x1024 texture > (I'm actually using 512x1024, but 1024x1024 should show the problem > better) and display it in a full screen quad? If you can get 60fps > then there's something definitely wrong with my code. > > It seems to me that there's a bottleneck somewhere when using > textures, because if I use a small texture and put it in a full screen > quad, I get 60fps no problem. It's when I use a larger texture that > the framerate starts dropping. > > Does the Droid/Milestone have dedicated video RAM? Or is it shared > system RAM? If it's shared, could the bottleneck be in transferring > the big texture to the GPU on every frame? > > > > Thank you, > > Federico > > > > On Jan 31, 2:09 pm, Robert Green <[email protected]> wrote: > > Federico - are you using GLSurfaceView or did you init EGL yourself? > > If you initialized it yourself, did you check to make sure the config > > gave you 24 bits of depth and not 16? That would be one thing to > > cause the slowdown. > > > > I usually get 40FPS on a Droid full-screen (not with a big quad but > > with a 3D scene) so something is certainly up with your code. > > > > On Jan 31, 10:58 am, Lance Nanek <[email protected]> wrote: > > > > > > > > > I don't have a Droid to test on, but if you haven't tried it already, > > > it might be worth dropping the various texture settings down to their > > > fastest/lowest quality and enabling mipmaps to check if that's where > > > the problem is. Something like this: > > > > > gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST); > > > > > if ( gl instanceof GL11 ) { > > > gl.glTexParameterf(GL11.GL_TEXTURE_2D, GL11.GL_GENERATE_MIPMAP, > > > GL11.GL_TRUE);} > > > > > gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, > > > GL10.GL_NEAREST); > > > gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, > > > GL10.GL_NEAREST); > > > > > Some of the past threads have also stated that depth size 24 is faster > > > than anything else on the Droid for some reason. So make sure you end > > > up with that config. > > > > > On Jan 30, 11:58 pm, Federico Carnales <[email protected]> wrote: > > > > > > Hi all, > > > > > > So I'm doing some simple 2D stuff with OpenGL on Android and found > the > > > > performance to be very, very poor. > > > > > > To give you an example, I made an app with a full screen > > > > GLSurfaceView. I loaded a 512x1024 texture (containing a 480x854 > > > > image), set up an orthogonal 2D matrix, and set it to draw a 480x854 > > > > pixel quad with that texture, using vertex and texture arrays. > > > > Lighting, dither, blending, etc. is disabled. > > > > > > I would expect this to run at 60fps without problem, but that simple > > > > operation already drags the frame drawing time to 19ms/frame. > > > > > > If I add some more small textured quads around the screen, the > drawing > > > > time goes up to 22/24ms. If I enable blending it balloons to 28/30ms. > > > > > > This is testing on a Motorola Milestone, running 2.0.1. > > > > > > Is this normal? Am I doing something wrong or is it just a common > > > > problem in Android? > > > > > > Any advice on how to attain 60fps drawing simple textured quads in 2D > > > > using OpenGL? > > > > > > Thanks in advance! > > > > > > Regards, > > > > Federico > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected]<android-developers%[email protected]> > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
