We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.
Hi ,
I had meet a question that confuse me. I captured DS-5 Streamline data SwapBuffer of GLBenchMark .This test just refresh different color per frame.So I think it should be has the same Quads rasterized with screen size. I think it should be calculate that this:
( Quads rasterized )*4 / (screen width * screen height ) = 1( around) . But the data I captured was not as I thought . App should rasterize once , and to display it surfaceflinger will rasterize once again .I captured data on Mali 400(screen size 480*854) and Mali 720(screen size : 1080*1920 ) ,the result is same on rasterization. Here is the figures. Can you help me to figure it out .
Thanks !
Mali 720( two pp):
Quad Rasterized : 259559*4*2 from app calls opengl to surfaceflinger display it
Mali 400: ( 54802+ 54786) *4 from app calls opengl to surfaceflinger display it
Mali 720 : (259559*4) * 2 / (1080*1920) = 1.001385031
Mali 400 : (54802+ 54786) * 4 / (480 *854 ) = 1.069359875
So ,it should be 2 around . Beacuse App call opengl es call will cause once rasterized , and surface-flinger will call GPU to do composition ,so it also needs once rasterized .
Also worth noting that the default "dedicated hardware block" on most devices is the display controller which normally has multi-layer support, so there may be no actual need to composite anything into a flattened buffer in memory.