opengl-es-2.0

I get a fill rate of about 30fps in my application. I know that GLES20.glClear() is used to clear the screen for every draw. If i comment it i get a fps of about 60fps. But the output is not as expected. I have a content to be redrawn for the whole screen in every frame. Is there any alternative where i can redraw the whole screen with out using the GLES20.glClear(). Please let me know if there is any way to play around with GLES20.glClear() to improve the performance? If you overwrite the entire color buffer with your geometry each frame you can get away with just clearing the depth buffer.

I'm trying to replace OpenGL's gl_FragDepth feature which is missing in OpenGL ES 2.0. I need a way to set the depth in the fragment shader, because setting it in the vertex shader is not accurate enough for my purpose. AFAIK the only way to do that is by having a render-to-texture framebuffer on which a first rendering pass is done. This depth texture stores the depth values for each pixel on the screen. Then, the depth texture is attached in the final rendering pass, so the final renderer knows the depth at each pixel. Since iOS >= 4.1 supports GL_OES_depth_texture , I'm trying to use GL

I'm new to OpenGL on Android and I have read heavily documented samples, and I kinda understand it. But before trying to do anything complex, I want to draw a simple 2D white rectangle on a black bacground. Nothing else. I'm stuck at this error: call to OpenGL ES API with no current context , which seems to be that I'm calling something from the non-OpenGL Thread . The thing is that I'm not sure what is called from the OpenGL Thread . So here's my code //============== Activity ==================// public class MainActivity extends Activity { public static String TAG = MainActivity.class