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#include "nes/common/fps-counter.hh"
namespace nes
{
auto fps_counter::frame(std::chrono::microseconds const elapsed_time) -> void
{
if (elapsed_time.count() <= 0) { return; }
if (buffer_position_ == 0)
{
// Update fps count.
auto sum = u32{ 0 };
for (auto i = u32{ 0 }; i < buffer_size; ++i) { sum += frame_times_[i]; }
if (sum > 0)
{
buffered_fps_ = (buffer_size * 1000000) / sum;
}
else
{
buffered_fps_ = 0;
}
}
// Add the frame time to the buffer, replacing any existing content in the ring buffer.
auto const frame_time = static_cast<u32>(elapsed_time.count());
frame_times_[buffer_position_] = frame_time;
buffer_position_ = (buffer_position_ + 1) % buffer_size;
}
} // namespace nes
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