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Improve frame rate performance on iOS : nanovg_gl.h #305

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Improve frame rate performance on iOS : nanovg_gl.h #305

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Commits on Aug 31, 2016

  1. Update nanovg_gl.h 

    Changing from discarding the result ("discard;") to assigning the result variable with vec4(0,0,0,0) appears to drastically improve performance on iOS.

(FPS running NanoVG Demo on iPhone 5, iOS 7.0 : From 13 FPS on average to around 40 FPS)
    @swittk
    swittk committed Aug 31, 2016
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