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How iPhone's GPU works (or why it sucks)? [large video]

• jerf 17y ago
  Hey, that's over half-a-gig! A warning in the title would be nice, since for me that's NSFW, albeit in a non-traditional way.
  • dirtyaura 17y ago
    Ah, sorry about that. Edited the title Here is a leaner version with reduced quality: http://media.assembly.org/vod/2009/Seminars/875_iPhone_-_learning_the_ways_of_GPU_from_the_driver_code_h264_1024kbit.mp4 http://media.assembly.org/vod/2009/Seminars/875_iPhone_-_lea...
• hypermatt 17y ago
  Intensive technical knowledge, I wish he gave a bit of overview, its getting long. I'm guessing he figured out how to make it faster or he was just exploring it the bad driver code.
  • nvoorhies 17y ago
    He shows some ways to poke memory managed by the iphone driver and saturate the gpu using only ~20% of cpu instead of the 64% that you use with the conventional OpenGLES path. This necessarily introduces some fragility since you're essentially poking at magic locations in memory in a totally non-safe manner, but he seems to think the driver's internal structures are stable enough that this isn't a problem. In fact, if enough top quality games do this, then the stability might be a self-fulfilling prophecy, since messing with the driver internal structures' layout would break all the really nice looking games.