From e93a2bc14ebe4527c7cdaa01aec18d42077f31a5 Mon Sep 17 00:00:00 2001
From: fgsfds <derp.primus@gmail.com>
Date: Wed, 22 May 2024 10:31:11 +0200
Subject: [PATCH] add config vars for audio thread runahead and sleep

---
 src/pc/configfile.c | 4 ++++
 src/pc/configfile.h | 2 ++
 src/pc/pc_main.c    | 5 +++--
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/pc/configfile.c b/src/pc/configfile.c
index 7411d4f8..a342c09d 100644
--- a/src/pc/configfile.c
+++ b/src/pc/configfile.c
@@ -54,6 +54,8 @@ unsigned int configMasterVolume = MAX_VOLUME; // 0 - MAX_VOLUME
 unsigned int configMusicVolume = MAX_VOLUME;
 unsigned int configSfxVolume = MAX_VOLUME;
 unsigned int configEnvVolume = MAX_VOLUME;
+float configAudioRunahead = 0.f;
+float configAudioSleep = 1.f;
 
 // Keyboard mappings (VK_ values, by default keyboard/gamepad/mouse)
 unsigned int configKeyA[MAX_BINDS]          = { 0x0026,   0x1000,     0x1103     };
@@ -106,6 +108,8 @@ static const struct ConfigOption options[] = {
     {.name = "music_volume",         .type = CONFIG_TYPE_UINT, .uintValue = &configMusicVolume},
     {.name = "sfx_volume",           .type = CONFIG_TYPE_UINT, .uintValue = &configSfxVolume},
     {.name = "env_volume",           .type = CONFIG_TYPE_UINT, .uintValue = &configEnvVolume},
+    {.name = "audio_sleep",          .type = CONFIG_TYPE_FLOAT, .floatValue = &configAudioSleep},
+    {.name = "audio_runahead",       .type = CONFIG_TYPE_FLOAT, .floatValue = &configAudioRunahead},
     {.name = "key_a",                .type = CONFIG_TYPE_BIND, .uintValue = configKeyA},
     {.name = "key_b",                .type = CONFIG_TYPE_BIND, .uintValue = configKeyB},
     {.name = "key_start",            .type = CONFIG_TYPE_BIND, .uintValue = configKeyStart},
diff --git a/src/pc/configfile.h b/src/pc/configfile.h
index b92ae7be..d053cbb0 100644
--- a/src/pc/configfile.h
+++ b/src/pc/configfile.h
@@ -23,6 +23,8 @@ extern unsigned int configMasterVolume;
 extern unsigned int configMusicVolume;
 extern unsigned int configSfxVolume;
 extern unsigned int configEnvVolume;
+extern float configAudioRunahead;
+extern float configAudioSleep;
 extern unsigned int configKeyA[];
 extern unsigned int configKeyB[];
 extern unsigned int configKeyStart[];
diff --git a/src/pc/pc_main.c b/src/pc/pc_main.c
index 98ddf78b..82dd954f 100644
--- a/src/pc/pc_main.c
+++ b/src/pc/pc_main.c
@@ -163,7 +163,8 @@ void* audio_thread() {
         set_sequence_player_volume(SEQ_PLAYER_SFX, (f32)configSfxVolume / 127.0f * master_mod);
         set_sequence_player_volume(SEQ_PLAYER_ENV, (f32)configEnvVolume / 127.0f * master_mod);
 
-        int samples_left = audio_api->buffered();
+        int samples_left = audio_api->buffered() - (audio_api->get_desired_buffered() * configAudioRunahead);
+        if (samples_left < 0) samples_left = 0;
         u32 num_audio_samples = samples_left < audio_api->get_desired_buffered() ? SAMPLES_HIGH : SAMPLES_LOW;
         // printf("Audio samples: %d %u\n", samples_left, num_audio_samples);
         s16 audio_buffer[SAMPLES_HIGH * 2];
@@ -191,7 +192,7 @@ void* audio_thread() {
         end_time = sys_profile_time();
 
         // Sleep for the remaining time
-        f64 nap_time = frametime_micro - (end_time - start_time);
+        f64 nap_time = (frametime_micro - (end_time - start_time)) * configAudioSleep;
         // printf("Audio thread nap time: %f\n", nap_time);
         if (nap_time > 0.0) sys_sleep(nap_time);