frame usage debug info

include/dusk/dusk.h

@@ -10,6 +10,7 @@ extern const char* configPath;
 
 namespace dusk {
     extern AuroraStats lastFrameAuroraStats;
+    extern float frameUsagePct;
 }
 
 constexpr u32 defaultWindowWidth = 608;

libs/JSystem/src/JFramework/JFWDisplay.cpp

@@ -13,6 +13,7 @@
 #include "JSystem/JUtility/JUTDbPrint.h"
 #include "JSystem/JUtility/JUTProcBar.h"
 #include "aurora/aurora.h"
+#include "dusk/dusk.h"
 #include "dusk/gx_helper.h"
 #include "dusk/logging.h"
 #include "dusk/settings.h"
@@ -358,10 +359,12 @@ static void waitForTick(u32 p1, u16 p2) {
     {
         static OSTime nextTick = OSGetTime();
         OSTime time = OSGetTime();
+        OSTime waitTime = (nextTick > time) ? (nextTick - time) : 0;
         while (time < nextTick) {
             JFWDisplay::getManager()->threadSleep((nextTick - time));
             time = OSGetTime();
         }
+        dusk::frameUsagePct = 100.0f * (1.0f - (float)waitTime / (float)p1);
         nextTick = time + p1;
     } else {
         static u32 nextCount = VIGetRetraceCount();

src/dusk/imgui/ImGuiMenuTools.cpp

@@ -97,6 +97,7 @@ namespace dusk {
             hasPrevious = true;
 
             ImGuiStringViewText(fmt::format(FMT_STRING("FPS: {:.2f}\n"), io.Framerate));
+            ImGuiStringViewText(fmt::format(FMT_STRING("Frame usage: {:.1f}%\n"), frameUsagePct));
 
             if (hasPrevious) {
                 ImGui::Separator();

src/m_Do/m_Do_main.cpp

@@ -111,6 +111,7 @@ s32 LOAD_COPYDATE(void*) {
 
 AuroraInfo auroraInfo;
 AuroraStats dusk::lastFrameAuroraStats;
+float dusk::frameUsagePct = 0.0f;
 const char* configPath;
 
 void main01(void) {