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Added more accurate GPU Timing #505

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Added more accurate GPU Timing #505

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Commits on Aug 29, 2024

  1. Added more accurate GPU Timing 

    Since GPUTime is used to calculate an estimated FPS, adding up all the timers doesn't paint the full picture.
Instead a new timer has been added: RENDER_FRAME
This timer is added at the start of postDrawScene() & ends just before the submit.

(cherry picked from commit 4c4de7b)
    @RuffledPlume
    RuffledPlume committed Aug 29, 2024
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Commits on Sep 1, 2024

  1. Improve CPU Timing Accuracy 

    FrameTimerOverlay::render() takes around 0.5 ms, account for this in the CPU time
glGetError() is costly to call, around 0.2 ms so whilst the FrameTimer is open suppress the function
    @RuffledPlume
    RuffledPlume committed Sep 1, 2024
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