5d339c09d8
Reduced calls to time_get() from 2 to 1 (which does a system call) and got rid of long double. Dumb "ring buffer" implementation remains
57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
/*
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* This software is licensed under the terms of the MIT License.
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* See COPYING for further information.
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* ---
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* Copyright (c) 2011-2019, Lukas Weber <laochailan@web.de>.
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* Copyright (c) 2012-2019, Andrei Alexeyev <akari@taisei-project.org>.
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*/
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#include "taisei.h"
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#include "framerate.h"
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#include "global.h"
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#include "video.h"
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void fpscounter_reset(FPSCounter *fps) {
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hrtime_t frametime = HRTIME_RESOLUTION / FPS;
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const int log_size = ARRAY_SIZE(fps->frametimes);
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for(int i = 0; i < log_size; ++i) {
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fps->frametimes[i] = frametime;
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}
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fps->fps = HRTIME_RESOLUTION / (long double)frametime;
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fps->frametime = frametime;
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fps->last_update_time = time_get();
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}
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void fpscounter_update(FPSCounter *fps) {
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const int log_size = ARRAY_SIZE(fps->frametimes);
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hrtime_t update_time = time_get();
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hrtime_t frametime = update_time - fps->last_update_time;
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memmove(fps->frametimes, fps->frametimes + 1, (log_size - 1) * sizeof(hrtime_t));
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fps->frametimes[log_size - 1] = frametime;
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hrtime_t avg = 0;
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for(int i = 0; i < log_size; ++i) {
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avg += fps->frametimes[i];
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}
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fps->fps = HRTIME_RESOLUTION / (avg / (double)log_size);
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fps->frametime = avg / log_size;
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fps->last_update_time = update_time;
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}
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uint32_t get_effective_frameskip(void) {
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uint32_t frameskip;
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if(global.frameskip > 0) {
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frameskip = global.frameskip;
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} else {
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frameskip = config_get_int(CONFIG_VID_FRAMESKIP);
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}
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return frameskip;
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}
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