mii_emu/ui_gl/miigl_counter.h
Michel Pollet 59beeb2f68
emulator UI: Timing measurement helpers
Used that to check obvious timing issues for framerates etc, didn't find
any problem...

Signed-off-by: Michel Pollet <buserror@gmail.com>
2024-02-12 16:56:38 +00:00

47 lines
1.0 KiB
C

/*
* miigl_counter.h
*
* Copyright (C) 2023 Michel Pollet <buserror@gmail.com>
*
* SPDX-License-Identifier: MIT
*/
#pragma once
#include <time.h>
#include <stdint.h>
#include "fifo_declare.h"
/*
* Cheapish way of counting how many time 'stuff' happends in a second,
* Can be used to count FPS or other things as long as the frequency is less
* than 1024hz.
*/
DECLARE_FIFO(uint64_t, miigl_counter, 1024);
DEFINE_FIFO(uint64_t, miigl_counter);
static uint64_t
miigl_get_time()
{
struct timespec tim;
clock_gettime(CLOCK_MONOTONIC_RAW, &tim);
uint64_t time = ((uint64_t)tim.tv_sec) * (1000000 / 1) +
tim.tv_nsec / (1000 * 1);
return time;
}
static int
miigl_counter_tick(
miigl_counter_t *c,
uint64_t time)
{
// = miigl_get_time();
// delete stamps that are older than a second
while (!miigl_counter_isempty(c) &&
(time - miigl_counter_read_at(c, 0)) > 1000000) {
miigl_counter_read(c);
}
long freq = miigl_counter_get_read_size(c);
if (!miigl_counter_isfull(c))
miigl_counter_write(c, time);
return freq;
}