/**
* Draws an animation frame showing the electron beam activated at the specified level.
*
* @param level The electron beam level.
* @return True if successful.
*/
public boolean draw(float level) {
if (DEBUG) {
Slog.d(TAG, "drawFrame: level=" + level);
}
if (!mPrepared) {
return false;
}
if (mMode == MODE_FADE) {
return showSurface(1.0f - level);
}
if (!attachEglContext()) {
return false;
}
try {
// Clear frame to solid black.
GLES10.glClearColor(0f, 0f, 0f, 1f);
GLES10.glClear(GLES10.GL_COLOR_BUFFER_BIT);
if (mElectronBeamMode == 1 || (mElectronBeamMode == 2 && mIsLandscape)) {
// Draw the frame vertical.
if (level < VSTRETCH_DURATION) {
drawHStretch(1.0f - (level / VSTRETCH_DURATION));
} else {
drawVStretch(1.0f - ((level - VSTRETCH_DURATION) / HSTRETCH_DURATION));
}
} else {
// Draw the frame horizontal.
if (level < HSTRETCH_DURATION) {
drawHStretch(1.0f - (level / HSTRETCH_DURATION));
} else {
drawVStretch(1.0f - ((level - HSTRETCH_DURATION) / VSTRETCH_DURATION));
}
}
if (checkGlErrors("drawFrame")) {
return false;
}
EGL14.eglSwapBuffers(mEglDisplay, mEglSurface);
} finally {
detachEglContext();
}
return showSurface(1.0f);
}
public void onDrawFrame(GL10 gl) {
/*
* By default, OpenGL enables features that improve quality
* but reduce performance. One might want to tweak that
* especially on software renderer.
*/
glDisable(GL_DITHER);
glTexEnvx(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
/*
* Usually, the first thing one might want to do is to clear
* the screen. The most efficient way of doing this is to use
* glClear().
*/
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
/*
* Now we're ready to draw some 3D objects
*/
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
GLU.gluLookAt(gl, 0, 0, -5, 0f, 0f, 0f, 0f, 1.0f, 0.0f);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, mTextureID);
glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
long time = SystemClock.uptimeMillis() % 4000L;
float angle = 0.090f * ((int) time);
glRotatef(angle, 0, 0, 1.0f);
mTriangle.draw(gl);
}