How to Rotate a Vertex by a Quaternion in GLSL
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The hilarious part of all of this is we’re still talking about small gains in performance. The impact on our CPU tests is 0 - 5%, and somewhere south of 10% on our GPU benchmarks as far as we can tell. I can't stress enough that it would be far less painful for the OEMs to just stop this nonsense and instead demand better performance/power efficiency from their silicon vendors. Whether the OEMs choose to change or not however, we’ve seen how this story ends. We’re very much in the mid-1990s PC era in terms of mobile benchmarks. What follows next are application based tests and suites. Then comes the fun part of course. Intel, Qualcomm and Samsung are all involved in their own benchmarking efforts, many of which will come to light over the coming years. The problem will then quickly shift from gaming simple micro benchmarks to which “real world” tests are unfairly optimized which architectures. This should all sound very familiar. To borrow from Brian’s Galaxy Gear review (and BSG): “all this has happened before, and all of it will happen again."read more @ AnandTech