Here are some things to try:
* Use your Projection. You are not calling your method to build the projection matrix, but you are pushing it to the shader. Yet, you are not using it in the shader (mutiply that vec4(...) with it).
* Turn off culling explicitly.
* Push your geometry a little positive from 0 in the Z direction.
* Change the 2 to a 4 in the glDrawElements call; this number represents the number of indices, not triangles
* Try changing from GL_TRIANGLE_STRIP to GL_TRIANGLES
Hi elliotpotts,
welcome to the special hell that is graphics programming ;)
Since I haven't found anything particularly wrong with your code, try the following:
* Add a GLES20.glGetError() after every single GLES20 function call you do. It it ever returns anything but 0, you've found your problem.
Otherwise, try to dumb it down:
* Do not use a vertex buffer, but push the vertices directly
* Use a simple orthographic projection
* Play with the z-value (negate it, +10, -10, ...). It may be that your geometry simply is not in the viewing area.
* Swear
Hope that helps!
Okay, so I tried doing `GLES20.glGetError()` after every GLES20 function call and all of them were 0. I've tried fiddling with the z values - still can't see anything. I've now tried without any matrices at all which should draw the vertices in window coordinates - https://gist.github.com/elliotpotts/9005362
I don't want to try without a vertex & element buffer because this is what I need to achieve! I still have no clue why I'm not seeing anything because the above code is very minimal.
Ahh I fixed the issue - I was trying to use the `GLES20` as if it were a C api therefore I was not using native `ByteBuffer`s! I have to allocate buffers with `ByteBuffer.allocateDirect` and then fill them with data.
