I have worked this out!
So for anyone who's interested:
When I removed gl.glEnableClientState(GL10.GL_COLOR_ARRAY); from the
code, it started working on the device, as well as continuing to work
on the emulator. When I put it back in we only get coloured shapes in
the emulator, and not on the device.
Does anyone know why there is this inconsistency? Is it a bug in the
sdk? Or a lack of understanding on my part?
Cheers,
Nilz.
On 26 May, 22:45, Nilz <nilz.v.pa...@gmail.com> wrote:
> Hi There!
>
> After spending the better half of this day getting my HTC Magic to
> work in developer mode, I've now found that some of my frist openGL
> coding attempts that appeared to work fine in the emulator doesn't
> work as expected on the device. I've narrowed this down to glColorf(r,
> g, b, a) not working as expected on the device itself. The provided
> OpenGL samples do work though.
>
> So for example, after modifying Cube.java from the samples to the
> below code I find that I get the expected grey square on the emulator
> but a blank white screen (background fill colour) on the device.
>
> class Cube
> {
> public Cube()
> {
> int one = 0x10000;
> int vertices[] = {
> -one, -one,
> -one, one,
> one, -one,
> one, one,
> };
>
> // Buffers to be passed to gl*Pointer() functions
> // must be direct, i.e., they must be placed on the
> // native heap where the garbage collector cannot
> // move them.
> //
> // Buffers with multi-byte datatypes (e.g., short, int, float)
> // must have their byte order set to native order
>
> ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length*4);
> vbb.order(ByteOrder.nativeOrder());
> mVertexBuffer = vbb.asIntBuffer();
> mVertexBuffer.put(vertices);
> mVertexBuffer.position(0);
> }
>
> public void draw(GL10 gl)
> {
> gl.glFrontFace(GL10.GL_CW);
> gl.glVertexPointer(2, gl.GL_FIXED, 0, mVertexBuffer);
> gl.glColor4f(0.5f, 0.5f, 0.5f, 0.5f);
> gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 4);
> }
>
> private IntBuffer mVertexBuffer;
>
> }
>
> I'm using the latest 1.5 SDK, and my device is the HTC Magic running
> firmware version 1.5.
>
> Can anyone explain to me why when switching from colour buffers and
> using glDrawElements to glColorf and glDrawArrays, stops shapes from
> being coloured in?
>
> Cheers,Nilz.
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