From 6d86c6f9bfe71d68191a7ed4beacf8745fc47af5 Mon Sep 17 00:00:00 2001
From: IndecisiveTurtle <47210458+raphaelthegreat@users.noreply.github.com>
Date: Thu, 18 Jul 2024 22:34:47 +0300
Subject: [PATCH] config: Add vblank divider option

---
 src/common/config.cpp                  | 7 +++++++
 src/common/config.h                    | 1 +
 src/core/libraries/videoout/driver.cpp | 4 +++-
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/common/config.cpp b/src/common/config.cpp
index a577b143a..6a7d25e8b 100644
--- a/src/common/config.cpp
+++ b/src/common/config.cpp
@@ -22,6 +22,7 @@ static bool isShowSplash = false;
 static bool isNullGpu = false;
 static bool shouldDumpShaders = false;
 static bool shouldDumpPM4 = false;
+static u32 vblankDivider = 1;
 static bool vkValidation = false;
 static bool vkValidationSync = false;
 // Gui
@@ -94,6 +95,10 @@ bool dumpPM4() {
     return shouldDumpPM4;
 }
 
+u32 vblankDiv() {
+    return vblankDivider;
+}
+
 bool vkValidationEnabled() {
     return vkValidation;
 }
@@ -237,6 +242,7 @@ void load(const std::filesystem::path& path) {
             isNullGpu = toml::find_or<toml::boolean>(gpu, "nullGpu", false);
             shouldDumpShaders = toml::find_or<toml::boolean>(gpu, "dumpShaders", false);
             shouldDumpPM4 = toml::find_or<toml::boolean>(gpu, "dumpPM4", false);
+            vblankDivider = toml::find_or<toml::integer>(gpu, "vblankDivider", 1);
         }
     }
     if (data.contains("Vulkan")) {
@@ -318,6 +324,7 @@ void save(const std::filesystem::path& path) {
     data["GPU"]["nullGpu"] = isNullGpu;
     data["GPU"]["dumpShaders"] = shouldDumpShaders;
     data["GPU"]["dumpPM4"] = shouldDumpPM4;
+    data["GPU"]["vblankDivider"] = vblankDivider;
     data["Vulkan"]["validation"] = vkValidation;
     data["Vulkan"]["validation_sync"] = vkValidationSync;
     data["Debug"]["DebugDump"] = isDebugDump;
diff --git a/src/common/config.h b/src/common/config.h
index 0a3b4905e..39c1c8485 100644
--- a/src/common/config.h
+++ b/src/common/config.h
@@ -26,6 +26,7 @@ bool showSplash();
 bool nullGpu();
 bool dumpShaders();
 bool dumpPM4();
+u32 vblankDiv();
 
 bool vkValidationEnabled();
 bool vkValidationSyncEnabled();
diff --git a/src/core/libraries/videoout/driver.cpp b/src/core/libraries/videoout/driver.cpp
index 0e832f728..cd96916ff 100644
--- a/src/core/libraries/videoout/driver.cpp
+++ b/src/core/libraries/videoout/driver.cpp
@@ -3,6 +3,7 @@
 
 #include <pthread.h>
 #include "common/assert.h"
+#include "common/config.h"
 #include "common/debug.h"
 #include "common/thread.h"
 #include "core/libraries/error_codes.h"
@@ -269,10 +270,11 @@ void VideoOutDriver::PresentThread(std::stop_token token) {
         return {};
     };
 
+    auto vblank_period = VblankPeriod / Config::vblankDiv();
     auto delay = std::chrono::microseconds{0};
     while (!token.stop_requested()) {
         // Sleep for most of the vblank duration.
-        std::this_thread::sleep_for(VblankPeriod - delay);
+        std::this_thread::sleep_for(vblank_period - delay);
 
         // Check if it's time to take a request.
         auto& vblank_status = main_port.vblank_status;