private boolean captureScreenshotTextureAndSetViewport() { if (!attachEglContext()) { return false; } try { if (!mTexNamesGenerated) { GLES10.glGenTextures(1, mTexNames, 0); if (checkGlErrors("glGenTextures")) { return false; } mTexNamesGenerated = true; } final SurfaceTexture st = new SurfaceTexture(mTexNames[0]); final Surface s = new Surface(st); try { SurfaceControl.screenshot( SurfaceControl.getBuiltInDisplay(SurfaceControl.BUILT_IN_DISPLAY_ID_MAIN), s); } finally { s.release(); } st.updateTexImage(); st.getTransformMatrix(mTexMatrix); // Set up texture coordinates for a quad. // We might need to change this if the texture ends up being // a different size from the display for some reason. mTexCoordBuffer.put(0, 0f); mTexCoordBuffer.put(1, 0f); mTexCoordBuffer.put(2, 0f); mTexCoordBuffer.put(3, 1f); mTexCoordBuffer.put(4, 1f); mTexCoordBuffer.put(5, 1f); mTexCoordBuffer.put(6, 1f); mTexCoordBuffer.put(7, 0f); // Set up our viewport. GLES10.glViewport(0, 0, mDisplayWidth, mDisplayHeight); GLES10.glMatrixMode(GLES10.GL_PROJECTION); GLES10.glLoadIdentity(); GLES10.glOrthof(0, mDisplayWidth, 0, mDisplayHeight, 0, 1); GLES10.glMatrixMode(GLES10.GL_MODELVIEW); GLES10.glLoadIdentity(); GLES10.glMatrixMode(GLES10.GL_TEXTURE); GLES10.glLoadIdentity(); GLES10.glLoadMatrixf(mTexMatrix, 0); } finally { detachEglContext(); } return true; }