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Back in the summer of 2009 I was working on a 3D engine that would power my next game: A 3D shoot'em up a la Ikaruga. The target was the very first iPhone (now called iPhone 2G). Despite being impressive on paper (600Mhz with dedicated GPU), the hardware had several issues and the lack of dedicated VRAM was a huge bottleneck. Unwilling to settle for anything less than 60 frames per second I became obsessed with saving bandwidth and I tried different approach until an idea pro...