From 456d7f883ca34ec83692ff3879ca5f5717e82b33 Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 2 May 2026 14:59:18 -0700
Subject: Use the simloop library

---
 app/src/app.c | 46 +++++++++++++++++-----------------------------
 1 file changed, 17 insertions(+), 29 deletions(-)

(limited to 'app/src')

diff --git a/app/src/app.c b/app/src/app.c
index 8262378..c056ddd 100644
--- a/app/src/app.c
+++ b/app/src/app.c
@@ -4,6 +4,7 @@
 
 #include <GLFW/glfw3.h>
 #include <log/log.h>
+#include <simloop.h>
 #include <timer.h>
 
 #include <assert.h>
@@ -13,9 +14,8 @@
 typedef struct GfxApp {
   GfxAppState*    app_state;
   GfxAppCallbacks callbacks;
-  int             max_fps;
-  double          update_delta_time;
   GLFWwindow*     window;
+  Simloop         simloop;
 } GfxApp;
 
 /// Storing the application state in a global variable so that we can call the
@@ -32,17 +32,9 @@ static void loop(GfxApp* app) {
   assert(app);
   assert(app->window);
 
-  const time_delta min_frame_time =
-      app->max_fps > 0 ? time_delta_from_sec(1.0 / (double)(app->max_fps)) : 0;
-  const time_delta update_dt   = time_delta_from_sec(app->update_delta_time);
-  time_delta       time        = 0;
-  time_delta       time_budget = 0;
-  Timer            timer       = timer_make();
-
-  // Warm up the update to initialize the application's state.
-  (*app->callbacks.update)(
-      app, app->app_state, time_delta_to_sec(time),
-      time_delta_to_sec(update_dt));
+  time_delta time   = 0;
+  Timer      timer  = timer_make();
+  SimloopOut simout = {};
 
   // Warm up the rendering before entering the main loop. A renderer can
   // compile shaders and do other initialization the first time it renders a
@@ -53,25 +45,21 @@ static void loop(GfxApp* app) {
   timer_start(&timer);
   while (!glfwWindowShouldClose(app->window)) {
     timer_tick(&timer);
-    time_budget += timer.delta_time;
+    simloop_update(&app->simloop, timer.delta_time, &simout);
+
+    glfwPollEvents();
 
-    while (time_budget >= update_dt) {
+    if (simout.should_update) {
       (*app->callbacks.update)(
           app, app->app_state, time_delta_to_sec(time),
-          time_delta_to_sec(update_dt));
-
-      time += update_dt;
-      time_budget -= update_dt;
+          time_delta_to_sec(simout.update_dt));
     }
 
     (*app->callbacks.render)(app, app->app_state);
     glfwSwapBuffers(app->window);
-    glfwPollEvents();
 
-    const time_point frame_end  = time_now();
-    const time_delta frame_time = time_diff(timer.last_tick, frame_end);
-    if ((min_frame_time > 0) && (frame_time < min_frame_time)) {
-      time_sleep(min_frame_time - frame_time);
+    if (simout.throttle > 0) {
+      time_sleep(simout.throttle);
     }
   }
 }
@@ -82,11 +70,9 @@ bool gfx_app_run(const GfxAppDesc* desc, const GfxAppCallbacks* callbacks) {
 
   bool success = false;
 
-  g_gfx_app.app_state         = desc->app_state;
-  g_gfx_app.callbacks         = *callbacks;
-  g_gfx_app.max_fps           = desc->max_fps;
-  g_gfx_app.update_delta_time = desc->update_delta_time;
-  g_gfx_app.window            = nullptr;
+  g_gfx_app.app_state = desc->app_state;
+  g_gfx_app.callbacks = *callbacks;
+  g_gfx_app.window    = nullptr;
 
   if (!glfwInit()) {
     LOGE("glfwInit() failed");
@@ -138,6 +124,8 @@ bool gfx_app_run(const GfxAppDesc* desc, const GfxAppCallbacks* callbacks) {
   // Set GLFW callbacks now that the application has been initialized.
   glfwSetWindowSizeCallback(g_gfx_app.window, on_resize);
 
+  g_gfx_app.simloop = simloop_make(&(SimloopArgs){
+      .update_fps = desc->update_fps, .max_render_fps = desc->max_render_fps});
   loop(&g_gfx_app);
 
   (*g_gfx_app.callbacks.shutdown)(&g_gfx_app, g_gfx_app.app_state);
-- 
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