Hi Ivan,
thanks for sharing this. It can be usefull to get something rendered
with as least code as possible. But for a performance critical
application (which almost all opengl games/apps are) you must keep the
multithreaded approach, or else you'll spend a lot of time refactoring
your code.
Take a look at the following link/video. It contains a lot of
valueable informations and explains why the OpenGL api examples are
multithreaded and why you should stick to the multithreaded approach.
http://code.google.com/intl/de-DE/events/io/sessions/WritingRealTimeGamesAndroid.html
On 9 Okt., 11:39, Ivan Volosyuk <ivan.volos...@gmail.com> wrote:
> I was using for sometime now OpenGL initialization code from Api demos
> and it was quite hard to exchange events between View and Renderer.
> So, I read pieces of documentation from GLES, EGL from jsr239 and
> finally made the single threaded GL initialization code which is much
> simpler than in ApiDemos. Here it is:
>
> import javax.microedition.khronos.egl.EGL10;
> import javax.microedition.khronos.egl.EGLConfig;
> import javax.microedition.khronos.egl.EGLContext;
> import javax.microedition.khronos.egl.EGLDisplay;
> import javax.microedition.khronos.egl.EGLSurface;
> import javax.microedition.khronos.opengles.GL10;
>
> import android.app.Activity;
> import android.os.Bundle;
> import android.os.Handler;
> import android.view.SurfaceHolder;
> import android.view.SurfaceView;
> import android.view.SurfaceHolder.Callback;
>
> public class MainActivitity extends Activity {
> @Override
> protected void onCreate(Bundle saved) {
> super.onResume();
> final EGL10 egl = (EGL10) EGLContext.getEGL();
> final EGLDisplay eglDisplay =
> egl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY);
> int[] version = new int[2];
> egl.eglInitialize(eglDisplay, version);
>
> int[] configSpec = {
> // EGL10.EGL_DEPTH_SIZE, 8,
> EGL10.EGL_NONE
> };
>
> final EGLConfig[] config = new EGLConfig[1];
> int num_configs[] = new int[1];
> egl.eglChooseConfig(eglDisplay, configSpec, config, 1, num_configs);
> final EGLContext eglContext =
> egl.eglCreateContext(eglDisplay, config[0], EGL10.EGL_NO_CONTEXT,
> null);
>
> // Setting up layouts and views
> SurfaceView view = new SurfaceView(this);
> setContentView(view);
>
> SurfaceHolder holder = view.getHolder();
> holder.setType(SurfaceHolder.SURFACE_TYPE_GPU);
> final GL10 gl = (GL10) eglContext.getGL();
> final Handler handler = new Handler();
>
> holder.addCallback(new Callback() {
> private EGLSurface surface;
> private Runnable painter;
>
> @Override
> public void surfaceChanged(SurfaceHolder holder, int format, int
> width,
> int height) {
> // initialize GL projection and other stuff
> // gl.glMatrixMode(GL10.GL_PROJECTION);
> // gl.glFrustumf(left, right, bottom, top, zNear, zFar);
> // ...
> painter = new Runnable() {
> @Override
> public void run() {
> drawFrame(gl);
> egl.eglSwapBuffers(eglDisplay, surface);
> handler.post(this);
> }
> };
> handler.post(painter);
> }
> @Override
> public void surfaceCreated(SurfaceHolder holder) {
> surface =
> egl.eglCreateWindowSurface(eglDisplay, config[0], holder, null);
> egl.eglMakeCurrent(eglDisplay, surface, surface, eglContext);
> }
> @Override
> public void surfaceDestroyed(SurfaceHolder holder) {
> handler.removeCallbacks(painter);
> }
> });
> }
>
> private void drawFrame(GL10 gl) {
> // Frame drawing...
> long t = System.currentTimeMillis() % 10000;
> gl.glClearColor(t / (float) 10000, t / (float) 10000 ,1 , 1);
> gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
> }
>
> }
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