Add timer

src/render_data.h

@@ -20,4 +20,6 @@ struct Render_Data {
   s32 width = 0;
   s32 height = 0;
   s32 triangle_count = 0;
+  f32 frame_time = 0.0f;
+  f32 user_interface_generate_time = 0.0f;
 };

src/renderer.cpp

@@ -73,6 +73,9 @@ bool init_renderer(Renderer *renderer, u32 width, u32 height) {
 
   init_user_interface(&renderer->user_interface, &renderer->render_data);
 
+  glEnable(GL_CULL_FACE);
+  glEnable(GL_DEPTH_TEST);
+
   return true;
 }
 
@@ -89,6 +92,10 @@ void set_renderer_size(Renderer *renderer, u32 width, u32 height) {
 }
 
 void draw_renderer(Renderer *renderer) {
+  // FPS time
+  static f32 previous_frame_start_time = 0.0;
+  f32 frame_start_time = glfwGetTime();
+
   while(renderer->render_data.width == 0 || renderer->render_data.height == 0) {
     glfwGetFramebufferSize(renderer->render_data.glfw_window, &renderer->render_data.width, &renderer->render_data.height);
     glfwWaitEvents();
@@ -100,9 +107,6 @@ void draw_renderer(Renderer *renderer) {
   glClearDepth(1.0f);
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
-  glEnable(GL_CULL_FACE);
-  glEnable(GL_DEPTH_TEST);
-
   Vector3 camera_position = Vector3(0.4f, 0.3f, 1.0f);
   Vector3 camera_look_at_position = Vector3(0.0f, 0.0f, 0.0f);
   Vector3 camera_up_vector = Vector3(0.0f, 1.0f, 0.0f);
@@ -134,8 +138,17 @@ void draw_renderer(Renderer *renderer) {
   unbind_frame_buffer(&renderer->frame_buffer);
 
   draw_frame_buffer(&renderer->frame_buffer);
+
+  // Timer
+  start_timer(&renderer->timer);
   create_user_interface_frame(&renderer->user_interface, &renderer->render_data);
+  renderer->render_data.user_interface_generate_time = stop_timer(&renderer->timer);
+
   render_user_interface(&renderer->user_interface);
+
+  // FPS time
+  renderer->render_data.frame_time = frame_start_time - previous_frame_start_time;
+  previous_frame_start_time = frame_start_time;
 }
 
 void upload_renderer_data(Renderer *renderer, Mesh *vertex_data) {

src/renderer.h

@@ -7,6 +7,7 @@
 #include <glm/gtc/type_ptr.hpp>
 #include "render_data.h"
 #include "user_interface.h"
+#include "timer.h"
 
 
 struct Frame_Buffer {
@@ -51,6 +52,7 @@ struct Renderer {
   Matrix4 projection_matrix = Matrix4(1.0f);
   User_Interface user_interface;
   Render_Data render_data;
+  Timer timer;
 };
 
 

src/timer.cpp

@@ -0,0 +1,22 @@
+#include "timer.h"
+
+void start_timer(Timer *timer) {
+  if (timer->running) {
+    return;
+  }
+
+  timer->running = true;
+  timer->start_time = std::chrono::steady_clock::now();
+}
+
+f32 stop_timer(Timer *timer) {
+  if (!timer->running) {
+    return 0;
+  }
+
+  timer->running = false;
+  auto stop_time = std::chrono::steady_clock::now();
+  f32 timer_milliseconds = std::chrono::duration_cast<std::chrono::microseconds>(stop_time - timer->start_time).count() / 1000.0f;
+
+  return timer_milliseconds;
+}

src/timer.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include "basic.h"
+#include <chrono>
+
+struct Timer {
+  bool running = false;
+  std::chrono::time_point<std::chrono::steady_clock> start_time{};
+};
+
+void start_timer(Timer *timer);
+f32 stop_timer(Timer *timer);

src/user_interface.cpp

@@ -19,6 +19,24 @@ void create_user_interface_frame(User_Interface *user_interface, Render_Data *re
   ImGuiWindowFlags imgui_window_flags = 0;
   ImGui::SetNextWindowBgAlpha(0.8f);
   ImGui::Begin("Control", nullptr, imgui_window_flags);
+  static f32 new_fps = 0.0f;
+  if (render_data->frame_time > 0.0) {
+    new_fps = 1.0f / render_data->frame_time;
+  }
+  user_interface->frames_per_second = (user_interface->averaging_alpha * user_interface->frames_per_second) + (1.0f - user_interface->averaging_alpha) * new_fps;
+
+  ImGui::Text("FPS:");
+  ImGui::SameLine();
+  ImGui::Text(std::to_string(user_interface->frames_per_second).c_str());
+  ImGui::Separator();
+
+  ImGui::Text("UI generation time:");
+  ImGui::SameLine();
+  ImGui::Text(std::to_string(render_data->user_interface_generate_time).c_str());
+  ImGui::SameLine();
+  ImGui::Text("ms");
+  ImGui::Separator();
+
   ImGui::Text("Triangles:");
   ImGui::SameLine();
   ImGui::Text(std::to_string(render_data->triangle_count).c_str());

src/user_interface.h

@@ -3,6 +3,8 @@
 #include "render_data.h"
 
 struct User_Interface {
+    f32 frames_per_second = 0.0f;
+    f32 averaging_alpha = 0.96f;
 };
 
 bool init_user_interface(User_Interface *user_interface, Render_Data *render_data);

src/window.cpp

@@ -45,8 +45,9 @@ bool init(Window *window, u32 width, u32 height, string title) {
   glfwSetWindowSizeCallback(window->glfw_window, handle_window_resize_events);
   glfwSetWindowCloseCallback(window->glfw_window, handle_close);
   glfwSetKeyCallback(window->glfw_window, handle_key_events);
-  glfwSetCursorPosCallback(window->glfw_window, handle_mouse_position_events);
-  glfwSetMouseButtonCallback(window->glfw_window, handle_mouse_button_events);
+  // Have to disable so ImGui will accept mouse events
+  // glfwSetCursorPosCallback(window->glfw_window, handle_mouse_position_events);
+  // glfwSetMouseButtonCallback(window->glfw_window, handle_mouse_button_events);
 
   window->model = new Model();
   init_model(window->model);