From cbb251fed185da7ad227c2b5ecfe89b4b47d45d8 Mon Sep 17 00:00:00 2001
From: Laura Hermanns <lukas.hermanns90@gmail.com>
Date: Sun, 23 Jun 2024 19:05:15 -0400
Subject: [PATCH] [Examples] Fixed time record output and improved Fonts
 example FPS output.

- Added missing '%' character to time record output (when F1 is pressed in examples).
- Show average FPS in Fonts example after every 500 milliseconds.
---
 examples/Cpp/ExampleBase/ExampleBase.cpp |  8 +++--
 examples/Cpp/Fonts/Example.cpp           | 40 +++++++++++++++++++-----
 2 files changed, 39 insertions(+), 9 deletions(-)

diff --git a/examples/Cpp/ExampleBase/ExampleBase.cpp b/examples/Cpp/ExampleBase/ExampleBase.cpp
index 44cc4dc0aa..76c8f77692 100644
--- a/examples/Cpp/ExampleBase/ExampleBase.cpp
+++ b/examples/Cpp/ExampleBase/ExampleBase.cpp
@@ -26,6 +26,8 @@
 #endif
 #include <inttypes.h>
 
+#define IMMEDIATE_SUBMIT_CMDBUFFER 0
+
 
 /*
  * Global helper functions
@@ -384,7 +386,7 @@ void ExampleBase::Run()
                     "-------------------\n"
                 );
                 for (const LLGL::ProfileTimeRecord& rec : frameProfile.timeRecords)
-                    LLGL::Log::Printf("%s: " PRIu64 " ns\n", rec.annotation, rec.elapsedTime);
+                    LLGL::Log::Printf("%s: %" PRIu64 " ns\n", rec.annotation, rec.elapsedTime);
 
                 debuggerObj_->SetTimeRecording(false);
                 showTimeRecords = false;
@@ -502,7 +504,9 @@ ExampleBase::ExampleBase(const LLGL::UTF8String& title)
     LLGL::CommandBufferDescriptor cmdBufferDesc;
     {
         cmdBufferDesc.debugName = "Commands";
-        //cmdBufferDesc.flags     = LLGL::CommandBufferFlags::ImmediateSubmit;
+        #if IMMEDIATE_SUBMIT_CMDBUFFER
+        cmdBufferDesc.flags     = LLGL::CommandBufferFlags::ImmediateSubmit;
+        #endif
     }
     commands = renderer->CreateCommandBuffer(cmdBufferDesc);
 
diff --git a/examples/Cpp/Fonts/Example.cpp b/examples/Cpp/Fonts/Example.cpp
index 66d74ea780..b46fe91c95 100644
--- a/examples/Cpp/Fonts/Example.cpp
+++ b/examples/Cpp/Fonts/Example.cpp
@@ -7,6 +7,7 @@
 
 #include <ExampleBase.h>
 #include <LLGL/Platform/Platform.h>
+#include <chrono>
 
 #define FONT_COURIER_NEW_16         ( 0 )
 #define FONT_LUCIDA_CONSOLE_32      ( 1 )
@@ -63,11 +64,19 @@ class Example_Fonts : public ExampleBase
     // Some numbers to display on screen.
     struct DisplayNumbers
     {
-        int counter = 0;
-        int fps     = 0;
+        int frameCounter    = 0;
+        int averageFPS      = 0;
     }
     displayNumbers;
 
+    struct AverageFPS
+    {
+        int                                     samples         = 0;
+        double                                  sum             = 0.0;
+        std::chrono::system_clock::time_point   lastTimePoint   = std::chrono::system_clock::now();
+    }
+    avgFPS;
+
     // Pre-defined fonts
     struct FontMetaData
     {
@@ -375,9 +384,26 @@ class Example_Fonts : public ExampleBase
             config.shadow = !config.shadow;
 
         // Update frame counters
-        displayNumbers.counter++;
-        if (displayNumbers.counter % 10 == 0)
-            displayNumbers.fps = static_cast<int>(1.0 / timer.GetDeltaTime());
+        displayNumbers.frameCounter++;
+
+        // Update average FPS every 500 milliseconds
+        const double fps = 1.0 / timer.GetDeltaTime();
+
+        if (!std::isinf(fps))
+        {
+            avgFPS.samples++;
+            avgFPS.sum += fps;
+        }
+
+        auto currentTimePoint = std::chrono::system_clock::now();
+        auto timeSinceLastAvgFPSUpdate = std::chrono::duration_cast<std::chrono::milliseconds>(currentTimePoint - avgFPS.lastTimePoint).count();
+        if (timeSinceLastAvgFPSUpdate > 500 && avgFPS.samples > 0)
+        {
+            displayNumbers.averageFPS   = static_cast<int>(avgFPS.sum / static_cast<double>(avgFPS.samples) + 0.5);
+            avgFPS.samples              = 0;
+            avgFPS.sum                  = 0.0;
+            avgFPS.lastTimePoint        = currentTimePoint;
+        }
 
         // Reset batch counter
         numBatches = 0;
@@ -419,7 +445,7 @@ class Example_Fonts : public ExampleBase
 
         // Draw frame counter
         DrawFont(
-            "Frame counter: " + std::to_string(displayNumbers.counter),
+            "Frame counter: " + std::to_string(displayNumbers.frameCounter),
             screenWidth - paragraphMargin, paragraphPosY, colorYellow,
             fontFlags | DrawRightAligned
         );
@@ -434,7 +460,7 @@ class Example_Fonts : public ExampleBase
 
         // Draw number of frames per second (FPS)
         DrawFont(
-            "FPS = " + std::to_string(displayNumbers.fps),
+            "FPS = " + std::to_string(displayNumbers.averageFPS),
             screenWidth - paragraphMargin, paragraphPosY, colorRed,
             fontFlags | DrawRightAligned
         );