My somewhat uneducated guess would be that emulator + some devices do
calculations using GLfixed instead of full GLfloat capacity. AFAIK GLfixed
should be able to handle values up to ~65535 though - but it's possible
that during during applying transformations etc OpenGL requires some of
this precision for internal purposes. Personally I would've expect this
wasn't the case though but can't think of any other reason for limit of
~7000 you're facing.
--
H
On Feb 20, 2012 12:16 PM, "Zveroid" <zver...@gmail.com> wrote:
> Hello!
>
> Sometimes I'm need to draw my objects with pretty hight coordinates
> (more than 200000). But when I trying to render even objects with
> coordinates about 10000, there's nothing on my emulator. But on my
> Samsung Galaxy S2 there's all ok!
> I tried to change coordinates and found highest coodinates - there's
> about 7000. If we use bigger values, we willn't see any objects.
> There's parts of my code:
> Initialization:
> ByteBuffer vbb = ByteBuffer.allocateDirect(VERTS * 3 * 4);
> vbb.order(ByteOrder.nativeOrder());
> mFVertexBuffer = vbb.asFloatBuffer();
>
> float[] coords = {
> 6985.5f, 6985.5f, 0,
> 6984.5f, 6985.5f, 0,
> 6985.0f, 6984.5f, 0,
> 6985.5f, 6985.5f,0,
> 6984.5f, 6985.5f, 0,
> 6985.0f, 6984.5f, 0
> }; //there's all ok with such coords. With >7000 triangle doesn't
> rendered.
>
> for (int i = 0; i < VERTS; i++) {
> for (int j = 0; j < 3; j++) {
> mFVertexBuffer.put(coords[i * 3 + j]);
> }
> }
>
> mFVertexBuffer.rewind();
>
> Render loop:
> gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
> gl.glMatrixMode(GL10.GL_MODELVIEW);
> gl.glLoadIdentity();
>
> GLU.gluLookAt(gl, 6985, 6985, 4, 6985, 6985, 0, 0f, 1f, 0f);
>
> gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
> gl.glColor4f(1.0f, 0.0f, 0.0f, 0.0f);
>
> gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mFVertexBuffer); //
> gl11.glBindBuffer(GL11.GL_ELEMENT_ARRAY_BUFFER, 0);
> gl.glDrawArrays(GL10.GL_TRIANGLES, 0,
> mFVertexBuffer.capacity() / 3);
>
> gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
>
>
> Is there emulator bug or there's my mistake somewhere?
> How I can solve this problem? I really need it - lots of chinense
> devices has pretty same bugs as emulator :(
>
> Thanks!
>
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