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LIBRETRO: add auto perf tuner restore feature

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This commit is contained in:
Giovanni Cascione 2023-04-04 15:17:21 +02:00
parent f1caf916ee
commit c509343b6e
2 changed files with 50 additions and 7 deletions
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6
backends/platform/libretro/include/os.h
View File

@ -34,15 +34,17 @@
#define AUDIO_STATUS_UPDATE_LATENCY (1 << 4)
// Performance switcher
#define PERF_SWITCH_FRAMESKIP_EVENTS 2
#define PERF_SWITCH_FRAMESKIP_EVENTS REFRESH_RATE / 2
#define PERF_SWITCH_ON (1 << 0)
#define PERF_SWITCH_ENABLE_TIMING_INACCURACIES (1 << 1)
#define PERF_SWITCH_ENABLE_REDUCE_FRAMERATE (1 << 2)
#define PERF_SWITCH_DISABLE_CONSECUTIVE_SCREEN_UPDATES (1 << 3)
#define PERF_SWITCH_OVER (1 << 4)
#define PERF_SWITCH_RESET_THRESHOLD 60
#define PERF_SWITCH_RESET_REST REFRESH_RATE * 30
// Reduce framerate
#define REDUCE_FRAMERATE_TAIL REFRESH_RATE / 2
#define REDUCE_FRAMERATE_REST REFRESH_RATE / 2
#define REDUCE_FRAMERATE_SHIFT_MAX 2
#define REDUCE_FRAMERATE_SHIFT_AUTO 1
#define REDUCE_FRAMERATE_SHIFT_HALF 2

51
backends/platform/libretro/src/libretro.cpp
View File

@ -80,7 +80,7 @@ char cmd_params_num;
int adjusted_RES_W = 0;
int adjusted_RES_H = 0;
static uint32 current_frame = 0;
static uint32 current_frame = 1;
static uint8 frameskip_no;
static uint8 frameskip_type;
static uint8 frameskip_threshold;
@ -98,6 +98,9 @@ static uint8 audio_status = 0;
static unsigned retro_audio_buff_occupancy = 0;
static uint32 perf_ref_frame = 0;
static uint32 perf_ref_audio_buff_occupancy = 0;
float frame_rate;
static uint16 samples_per_frame = 0; // length in samples per frame
static size_t samples_per_frame_buffer_size = 0;
@ -169,6 +172,29 @@ static void increase_performance() {
performance_switch |= PERF_SWITCH_OVER;
}
static void increase_accuracy() {
performance_switch &= ~PERF_SWITCH_OVER;
if (performance_switch & PERF_SWITCH_ENABLE_REDUCE_FRAMERATE) {
performance_switch &= ~PERF_SWITCH_ENABLE_REDUCE_FRAMERATE;
log_cb(RETRO_LOG_DEBUG, "Auto performance tuner: 'Auto reduce framerate' disabled.\n");
return;
}
if (performance_switch & PERF_SWITCH_ENABLE_TIMING_INACCURACIES) {
performance_switch &= ~PERF_SWITCH_ENABLE_TIMING_INACCURACIES;
log_cb(RETRO_LOG_DEBUG, "Auto performance tuner: 'Allow Timing Inaccuracies' disabled.\n");
return;
}
if (performance_switch & PERF_SWITCH_DISABLE_CONSECUTIVE_SCREEN_UPDATES) {
performance_switch &= ~PERF_SWITCH_DISABLE_CONSECUTIVE_SCREEN_UPDATES;
log_cb(RETRO_LOG_DEBUG, "Auto performance tuner: 'Disable consecutive screen updates' disabled.\n");
return;
}
}
static void update_variables(void) {
struct retro_variable var;
@ -716,7 +742,7 @@ void retro_run(void) {
if ((audio_status & AUDIO_STATUS_BUFFER_UNDERRUN) && !(audio_status & AUDIO_STATUS_MUTE)) {
if (reduce_framerate_shift < REDUCE_FRAMERATE_SHIFT_MAX)
reduce_framerate_shift++;
reduce_framerate_countdown = REDUCE_FRAMERATE_TAIL;
reduce_framerate_countdown = REDUCE_FRAMERATE_REST;
}
if (reduce_framerate_countdown)
reduce_framerate_countdown--;
@ -747,18 +773,33 @@ void retro_run(void) {
log_cb(RETRO_LOG_DEBUG, "%d frame(s) skipped\n",frameskip_counter);
skip_frame = false;
frameskip_counter = 0;
/* Keep on skipping frames if flagged */
} else if (skip_frame) {
frameskip_counter++;
/* Performance counter */
if ((performance_switch & PERF_SWITCH_ON) && !(performance_switch & PERF_SWITCH_OVER)) {
frameskip_events++;
if (frameskip_events > PERF_SWITCH_FRAMESKIP_EVENTS) {
increase_performance();
frameskip_events = 0;
perf_ref_frame = current_frame - 1;
perf_ref_audio_buff_occupancy = 0;
}
}
}
/* Keep on skipping frames if flagged */
} else if (skip_frame)
frameskip_counter++;
/* Performance tuner reset if average buffer occupacy is above the required threshold again */
if (!skip_frame && (performance_switch & PERF_SWITCH_ON) && performance_switch > PERF_SWITCH_ON) {
perf_ref_audio_buff_occupancy += retro_audio_buff_occupancy;
if ((current_frame - perf_ref_frame) % (PERF_SWITCH_RESET_REST) == 0) {
uint32 avg_audio_buff_occupancy = perf_ref_audio_buff_occupancy / (current_frame - perf_ref_frame);
if (avg_audio_buff_occupancy > PERF_SWITCH_RESET_THRESHOLD || avg_audio_buff_occupancy == retro_audio_buff_occupancy)
increase_accuracy();
perf_ref_frame = current_frame - 1;
perf_ref_audio_buff_occupancy = 0;
frameskip_events = 0;
}
}
/* Switch to ScummVM thread, unless frameskipping is ongoing */
if (!skip_frame)