GLSL SpinLock only Mostly Works

Question

I have implemented a depth peeling algorithm using a GLSL spinlock (inspired by this). In the following visualization, notice how overall the depth peeling algorithm functi

Answer 1

The "imageAtomicExchange(img2D_0,coord,0);" needs to be inside the if statement, since it is resetting the lock variable even for threads that didn't have it! Changing this fixes it.