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61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
#include "fps_counter.h"
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#include <SDL2/SDL_timer.h>
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#include "log.h"
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void
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fps_counter_init(struct fps_counter *counter) {
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counter->started = false;
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// no need to initialize the other fields, they are meaningful only when
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// started is true
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}
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void
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fps_counter_start(struct fps_counter *counter) {
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counter->started = true;
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counter->slice_start = SDL_GetTicks();
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counter->nr_rendered = 0;
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counter->nr_skipped = 0;
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}
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void
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fps_counter_stop(struct fps_counter *counter) {
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counter->started = false;
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}
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static void
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display_fps(struct fps_counter *counter) {
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if (counter->nr_skipped) {
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LOGI("%d fps (+%d frames skipped)", counter->nr_rendered,
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counter->nr_skipped);
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} else {
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LOGI("%d fps", counter->nr_rendered);
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}
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}
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static void
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check_expired(struct fps_counter *counter) {
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uint32_t now = SDL_GetTicks();
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if (now - counter->slice_start >= 1000) {
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display_fps(counter);
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// add a multiple of one second
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uint32_t elapsed_slices = (now - counter->slice_start) / 1000;
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counter->slice_start += 1000 * elapsed_slices;
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counter->nr_rendered = 0;
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counter->nr_skipped = 0;
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}
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}
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void
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fps_counter_add_rendered_frame(struct fps_counter *counter) {
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check_expired(counter);
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++counter->nr_rendered;
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}
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void
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fps_counter_add_skipped_frame(struct fps_counter *counter) {
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check_expired(counter);
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++counter->nr_skipped;
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}
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