Thanks for those critical points. One thing more, I need to call buffer.position(0) after each call to bulk put method, right?
On May 3, 1:19 am, Mario Zechner <[email protected]> wrote: > Do not call glBufferSubData, use glBufferData instead. The former is > dog slow on most mobile GPUs for various reasons (pipeline stall if > that buffer is currently in use etc.). > > Also, do not use Buffer.put(int index, float value) if you can instead > use the bulk put operations. For direct Buffers that's one JNI call > per float which is way to costly. Note however that bulk puts are slow > up until Android 2.3 as well. > Seehttp://www.badlogicgames.com/wiki/index.php/Direct_Bulk_FloatBuffer.p... > > On 2 Mai, 23:50, elix <[email protected]> wrote: > > > > > > > > > Thanks adam. > > > I asked this topic in stackoverflow and it is solved. Simply; update > > the coordinate data within the buffer object by using put(index, > > value) method and then call glbuffersubdata() method. > > Here is detailed > > answers:http://stackoverflow.com/questions/5849566/how-to-change-the-content-... > > > On May 2, 8:21 pm, Adam Hammer <[email protected]> wrote: > > > > Just use get and put on the buffer with your data.memory layout can > > > vary but typically is xyzxyzxyz which would be the 9 floats that > > > define your 3 vertices. > > > > Adam > > > > On May 1, 12:27 pm, emre onal <[email protected]> wrote: > > > > > I have some triangle polygons and drawing them in a traditional way: > > > > (android-java code) > > > > > gl.glDrawArrays(GL10.GL_TRIANGLES, i, j); > > > > > I want to update the vertex coordinates of the triangles. All of the > > > > tutorials I've found use an initial vertex data then only apply > > > > transformations to them. I need to change each vertex coordinate > > > > independently. > > > > > I change the content of the array which is used to create the related > > > > vertexbuffer but it doesn't make any change on the screen. Rebuilding > > > > the > > > > vertexbuffer on eachframe doesn't seem to be right way I guess. > > > > > Can you point out any example source code at least, if you know any? > > > > > -- > > > > > Emre -- 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
