Hi,
I have a 3D game and I am using color-picking to know which object was
selected.
When the user touches the screen, I draw each object with a different color.
Then I read the color where the user touched the screen to know which object
was selected. After that I draw each object with their respective
textures/colors. (everything done during one onDrawFrame pass)
The problem is that sometimes the colored objects appear on the screen (~5%
of the times the user touches the screen) and it is even worse on slower
hardwares.
This is my pseudo code:
public void onDrawFrame(GL10 gl) {
if (user touched the screen) {
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
gl.glMatrixMode(GL10.GL_MODELVIEW);
// DRAW COLORED OBJECTS
gl.glReadPixels(x, y, ......);
// CHECK WHICH OBJECT WAS SELECTED
gl.glColor4x(0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF);
}
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
gl.glMatrixMode(GL10.GL_MODELVIEW);
// DRAW TEXTURED OBJECTS
}
As far as I understand, we always draw on the Back Buffer and only after we
finish, it swaps to the Front Buffer and updates the screen.
Is there anything wrong with the above code?
Thanks!
Thiago
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