From 3f914412f3164c8cc5b4a3c877ae40ba0eb635c3 Mon Sep 17 00:00:00 2001
From: fleroviux <fleroviux@gmail.com>
Date: Thu, 26 Oct 2023 22:31:59 +0200
Subject: [PATCH] sdl2: add a basic frame counter

---
 src/platform/sdl/src/application.cpp | 21 +++++++++++++++++++--
 src/platform/sdl/src/application.hpp |  4 ++++
 2 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/src/platform/sdl/src/application.cpp b/src/platform/sdl/src/application.cpp
index 3862d74..447b36f 100644
--- a/src/platform/sdl/src/application.cpp
+++ b/src/platform/sdl/src/application.cpp
@@ -26,7 +26,7 @@ int Application::Run(int argc, char **argv) {
   LoadBootROM("boot9.bin", true);
   LoadBootROM("boot7.bin", false);
   if(argc < 2) {
-    LoadROM("Simple_Tri.nds");
+    LoadROM("pokeplatin.nds");
   } else {
     LoadROM(argv[1]);
   }
@@ -44,7 +44,7 @@ void Application::CreateWindow() {
     SDL_WINDOW_ALLOW_HIGHDPI
   );
 
-  m_renderer = SDL_CreateRenderer(m_window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
+  m_renderer = SDL_CreateRenderer(m_window, -1, SDL_RENDERER_ACCELERATED);
 
   for(auto& texture : m_textures) {
     texture = SDL_CreateTexture(m_renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, 256, 192);
@@ -138,6 +138,8 @@ void Application::MainLoop() {
       SDL_RenderPresent(m_renderer);
 
       m_emu_thread.ReleaseFrame();
+
+      UpdateFPS();
     }
 
     m_emu_thread.SetFastForward(SDL_GetKeyboardState(nullptr)[SDL_SCANCODE_SPACE]);
@@ -155,3 +157,18 @@ void Application::MainLoop() {
     }
   }
 }
+
+void Application::UpdateFPS() {
+  const auto now = std::chrono::system_clock::now();
+  const auto elapsed_time = std::chrono::duration_cast<std::chrono::milliseconds>(
+    now - m_last_fps_update).count();
+
+  m_fps_counter++;
+
+  if(elapsed_time >= 1000) {
+    const f32 fps = (f32)m_fps_counter / (f32)elapsed_time * 1000.0f;
+    SDL_SetWindowTitle(m_window, fmt::format("irisdual [{:.2f} fps]", fps).c_str());
+    m_fps_counter = 0;
+    m_last_fps_update = std::chrono::system_clock::now();
+  }
+}
diff --git a/src/platform/sdl/src/application.hpp b/src/platform/sdl/src/application.hpp
index a85b558..edaa9fb 100644
--- a/src/platform/sdl/src/application.hpp
+++ b/src/platform/sdl/src/application.hpp
@@ -1,6 +1,7 @@
 
 #pragma once
 
+#include <chrono>
 #include <dual/nds/nds.hpp>
 #include <memory>
 
@@ -20,6 +21,7 @@ class Application {
     void LoadROM(const char* path);
     void LoadBootROM(const char* path, bool arm9);
     void MainLoop();
+    void UpdateFPS();
 
     SDL_Window* m_window;
     SDL_Renderer* m_renderer;
@@ -27,4 +29,6 @@ class Application {
 
     std::unique_ptr<dual::nds::NDS> m_nds{};
     EmulatorThread m_emu_thread{};
+    int m_fps_counter{};
+    std::chrono::time_point<std::chrono::system_clock> m_last_fps_update{};
 };
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