I have an array in memory that represents the screen. I then call put() once to put that into the ByteBuffer that gets pased to OpenGL.
I tried skipping the ByteBuffer stuff and just passing the internal array from Java to native and then calling glTexImage2D() with the pointer to avoid the copy, and while it's slightly faster, the upload of the texture takes about 100ms which is too long. It's a 2D application, and the contents of the "screen" (as represented by this internal array I'm passing around) can change at any given time. I'm think I may have to use some combination of sub texture updates in order to get what want and have it be smooth. Uploading a 512x256 texture each frame may be too much. Any other ideas how I can speed this up? On Feb 23, 6:42 pm, Robert Green <rbgrn....@gmail.com> wrote: > If you're creating a bitmap dynamically, writing one byte at a time > with .put(), I wouldn't be surprised at all if it's really slow. If > at all possible, move that code into native. You can preallocate a > ByteBuffer in Java, pass it into native and work on the pointer > directly in native, then use it in OpenGL either in Java or in > native. > > You haven't said what the application is but if you can use the GPU > and a framebuffer to create your dynamic texture instead of doing it > on the CPU with a bitmap, that's another much faster way to go. > > On Feb 23, 5:42 pm, Jonathan <jon.aposto...@gmail.com> wrote: > > > > > Hey guys, > > > I'm porting over some software from the iPhone, and the fact that I > > need to use ByteBuffers for my data structures in order to use OpenGL > > is killing me. My render loop takes 3ms to actually do the work and > > render screen, but I do need to perform a ByteBuffer clear / > > repopulate to update a dynamic texture. > > > The bytebuffer clear, followed by the put() and position(0) to prepare > > for texture uploading takes about 100ms. This is WAY too slow. > > > Is there a way around using ByteBuffers other than going the NDK > > route? The texture is 512x256 RGBA... should the > > ByteBuffer .clear() .put() and .position() be taking 100ms? > > > Thanks in advance. -- 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
