add framelimiter_busy_loop_buffer_100ns dial

DockerFile

@@ -1,2 +1,2 @@
-FROM opensuse/tumbleweed
-RUN zypper install -y mingw32-cross-gcc-c++
+FROM ubuntu:22.04
+RUN apt update; DEBIAN_FRONTEND=noninteractive apt install -y g++-mingw-w64-i686

README.md

@@ -9,6 +9,10 @@
 	- game runs on rough milisecond precision, recommend keeping framerate below 300
 - `framelimiter_full_busy_loop` in `s4_league_fps_unlock.json` adjusts the built-in frame limiter's behavior when fps limit is non 0
 	- it is set to `false` by default to not fully busy loop before the next frame
-	- setting it to `true` might improve latency at lower framerates, at the cost of busy looping power usage
+	- setting it to `true` might improve latency when the game is rendering faster than the frame limiter, at the cost of busy looping cpu power usage
+- `framelimiter_busy_loop_buffer_100ns` is a mixed approach of `framelimiter_full_busy_loop`, enforcing some busy loop right before the next frame
+	- `framelimiter_full_busy_loop` has to be set to false for this to take effect
+	- it is set to `15000` by default to not always busy loop but still try and secure cpu resources timely for the next frame
+	- when the game is rendering faster than the frame limiter, setting it to `0` would reduce cpu power usage, but might introduce latency and frametime jitter when there are active background tasks
 
 json.hpp is optained from https://github.com/nlohmann v3.11.3 release

s4_league_fps_unlock.cpp

@@ -52,8 +52,6 @@ NtSetTimerResolution(
 
 static ULONG min_nt_delay_100ns;
 
-#define SLEEP_BUFFER_100NS (10000 + 5000)
-
 #define ENABLE_LOGGING 0
 
 #if ENABLE_LOGGING
@@ -113,6 +111,7 @@ struct config{
 	int field_of_view;
 	int sprint_field_of_view;
 	bool framelimiter_full_busy_loop;
+	int framelimiter_busy_loop_buffer_100ns;
 };
 
 static uint32_t target_frametime_ns;
@@ -123,10 +122,11 @@ static uint8_t weapon_slot;
 static float set_drop_val;
 
 struct config config = {
-	.max_framerate = -1,
+	.max_framerate = 300,
 	.field_of_view = 60,
 	.sprint_field_of_view = 80,
 	.framelimiter_full_busy_loop = false,
+	.framelimiter_busy_loop_buffer_100ns = 15000,
 };
 
 static void parse_config(){
@@ -177,6 +177,12 @@ static void parse_config(){
 			staging_config.framelimiter_full_busy_loop = parsed_config_file["framelimiter_full_busy_loop"];
 			LOG_VERBOSE("setting framelimiter full busy loop to %s", staging_config.framelimiter_full_busy_loop ? "true" : "false");
 		}
+		if(!parsed_config_file["framelimiter_busy_loop_buffer_100ns"].is_number()){
+			LOG("failed reading framelimiter_busy_loop_buffer_100ns from %s, ", config_file_name)
+		}else{
+			staging_config.framelimiter_busy_loop_buffer_100ns = parsed_config_file["framelimiter_busy_loop_buffer_100ns"];
+			LOG_VERBOSE("setting framelimiter busy loop buffer (100ns) to %s", framelimiter_busy_loop_buffer_100ns);
+		}
 	}catch(nlohmann::json::exception e){
 		LOG("failed reading %s after parsing, %s", config_file_name, e.what());
 	}
@@ -637,8 +643,8 @@ void __attribute__((thiscall)) patched_game_tick(void *tick_ctx){
 					// spin it all
 				}else{
 					uint32_t diff_100ns = diff_ns / 100;
-					if(target_frametime_100ns > diff_100ns + SLEEP_BUFFER_100NS){
-						uint32_t sleep_100ns = target_frametime_100ns - (diff_100ns + SLEEP_BUFFER_100NS);
+					if(target_frametime_100ns > diff_100ns + config.framelimiter_busy_loop_buffer_100ns){
+						uint32_t sleep_100ns = target_frametime_100ns - (diff_100ns + config.framelimiter_busy_loop_buffer_100ns);
 						#if LOG_VERBOSE
 						uint32_t sleep_100ns_pre_correct = sleep_100ns;
 						#endif

s4_league_fps_unlock.json

@@ -2,5 +2,6 @@
 	"max_framerate":300,
 	"field_of_view":60,
 	"sprint_field_of_view":80,
-	"framelimiter_full_busy_loop":false
+	"framelimiter_full_busy_loop":false,
+	"framelimiter_busy_loop_buffer_100ns":15000
 }