I implemented a tile-based light culling renderer using the compute shader as in the ATI sample with the puppets and the dagon(i think it was called Leo).While alpha clipping is simple to implement,the alpha blending seems impossible to do without some huge performance or quality penalty.If you render the gbuffer stuff and then render/blend transperent stuff over it with a forward render,it would look weird and out of place.It won't be affected by the hundreds of lights that you use in the deferred renderer(which means your coolest feature(getting something lighted by a lot of lights at once) won't work on glasses,windows,crystals,water and stuff like that).What are efficient ways to implement alpha blending inside your deferred renderer?