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POIs it possible to achieve MAX(As,Ad) openGL blending?
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copied!<p>I am working on a game where I want to create shadows under a series of sprites on a grid. The shadows are larger than the sprites themselves and the sprites are animated (i.e. move and rotate).</p> <p>I cannot simply render them into the sprite png, or the shadows will overlap adjacent sprites.</p> <p>I also cannot simply put shadows on a lower layer by themselves, because when they overlap, they will create dark bands at their intersection.</p> <p>These sprites are animated, so it is not feasible to render these en masse.</p> <p>Basically, I want the sprites' shadows to blend together such that they max out at a set opacity. Example:</p> <p><a href="https://i.stack.imgur.com/58sPp.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/58sPp.jpg" alt="enter image description here"></a></p> <p>I believe this is equivalent to an openGL blending of (Rs,Gs,Bs,Max(As,Ds)), where I don't really care about R,G, and B, as it will always be the same color in src and dst.</p> <p>However, this is not a valid openGL blending mode. Is there an easy way to accomplish this, especially in cocos2d-iphone?</p> <p>I would be able to approximate this by making the shadow sprites opaque, then applying them both to a parent sprite, and making the parent sprite 40% opacity. However, the way cocos2d works, this only sets the opacity of each child to 40%, rather than the combined sprite image, which results in the same stripe.</p>

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