What steps would be involved in constructing a destructible 2D landscape, like in Worms? Ideally, What are some ways that this process could be made efficient as possible?
Answer
I don't know how the landscape in worms was implemented exactly, but I'm pretty sure they used a bitmap for the landscape (at least in the older games of the series).
A very basic approach would be a bitmap image (B/W) where black pixels represent air and white pixels represent ground. Destruction of the landscape can be done easily using pixel operations. So if a rocket hits the ground, paint a black circle with radius = blastRadius at the point of impact.
You can then render your world (or just a portion of it) using that bitmap. For better performance I suggest you implement it in a way, that you can update/render just a portion of the "world". Eg. if some parts of the landscape are destroyed by a rocket, just re-render the affected areas, not the whole world.
Instead of a B/W image as your "collision-map", you could also use a 24bit image where you use two channels to store the surface-normal (x,y) per pixel and one channel to store the actual "collision-map". Having the surface-normal at hand will greatly help you to calculate bouncing grenades, or to determine if a character can move in a given direction.
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