iphone - presentRenderbuffer : GL_RENDERBUFFER_OES takes long time -

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i added profiler game , isolated function. it, sometimes, cause fps drop. result:

present buffer time: 22 present buffer time: 1 present buffer time: 9 present buffer time: 1 present buffer time: 20 present buffer time: 6 present buffer time: 4 present buffer time: 4 present buffer time: 22 present buffer time: 4 present buffer time: 8 present buffer time: 4 present buffer time: 4 present buffer time: 15 present buffer time: 1 present buffer time: 1 present buffer time: 1 present buffer time: 11 present buffer time: 1 present buffer time: 6 present buffer time: 1 present buffer time: 1 present buffer time: 25 present buffer time: 6 present buffer time: 7 present buffer time: 1 present buffer time: 10 present buffer time: 7 present buffer time: 3 present buffer time: 1 present buffer time: 12 present buffer time: 9 present buffer time: 6 present buffer time: 9

do know why @ every few frames function takes more time?

this code:

     f64 time = -system::gettime();           [m_context presentrenderbuffer:gl_renderbuffer_oes];     log("present buffer time: %d\n", u32((system::gettime() + time) * 1000.));

if not calling glflush() explicitly, driver forced when present buffer, because @ point of presentrenderbuffer call rendering operations on buffer may not completed yet.

try calling glflush before presenting buffer , measuring time of separately.


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