I also tested this on an HTC Droid Incredible with the same bad result there.
Also, I tested by only drawing over part of the background instead of using glScissor(). Same result again. It would appear that the OpenGl library on HTC phones fills the color buffer with garbage on each swap. Why would this happen? Does anyone know if HTC changed the OpenGl library on its phones? Is there a place to file a bug report just for HTC versions of Android? Warren On Nov 10, 4:25 pm, Warren <warrenba...@gmail.com> wrote: > I am optimizing a game for performance. A large part of the screen > remains the same from frame to frame and it takes a while to render, > so I intend to use glScissor() to limit new drawing to only certain > parts of the screen. I do not do a > gl.glClear(GL10.GL_COLOR_BUFFER_BIT); so the bits that were drawn > previously should remain. > > This provides a large speed increase and works very well on the Droid > and on the emulator. However, it is not working on the G1 or Droid > Eris, both made by HTC. The areas outside the scissor region are still > being drawn over in a strange way. It's as if what's being drawn > inside the scissor region is being wrapped outside the region. There > is a large rectangle in the middle of the screen that has the correct > contents. This is the defined scissor region. Immediately below the > scissor region is a row, maybe 150-200 pixels high that looks like an > exact copy of the bottom of the scissor region. > > Again, this only is happening on the HTC phones. > > I believe that unless I specifically clear the color bits, they should > remain from frame to frame. Is this correct? Any ideas? Is this an HTC > OpenGL library bug? > > Thank you, > Warren -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
