From 1e7e9a4f9eb42588f1bd00c31b33a030f210b0dd Mon Sep 17 00:00:00 2001
From: SeanOMik <seanomik@gmail.com>
Date: Sun, 16 Oct 2022 15:42:19 -0400
Subject: [PATCH] Increase default TPS

---
 examples/dev_testing/src/main.cpp |  3 ++-
 include/simpleengine/game.h       |  7 +++----
 src/game.cpp                      | 26 ++++++++++++--------------
 3 files changed, 17 insertions(+), 19 deletions(-)

diff --git a/examples/dev_testing/src/main.cpp b/examples/dev_testing/src/main.cpp
index c53be1e..8ab98d6 100644
--- a/examples/dev_testing/src/main.cpp
+++ b/examples/dev_testing/src/main.cpp
@@ -96,7 +96,8 @@ int main(int argc, char *argv[]) {
     brick_e.add_component<se::ModelComponent>("examples/dev_testing/resources/bricks/bricks.fbx");
     brick_e.add_component<se::RotatingComponent>();
     auto &brick_transf = brick_e.add_component<se::TransformComponent>();
-    brick_transf.translate(6.f, -0.5f, 1.f);
+    brick_transf.translate(6.f, 0.f, 0.f);
+    //brick_transf.translate(6.f, -0.5f, 1.f);
 
     auto light = std::make_shared<se::gfx::Light>(core_shader, glm::vec3(0.f, 0.f, 0.f), glm::vec3(1.f, 1.f, 1.f));
     game.add_event(light);
diff --git a/include/simpleengine/game.h b/include/simpleengine/game.h
index 0078a61..e3bcd55 100644
--- a/include/simpleengine/game.h
+++ b/include/simpleengine/game.h
@@ -66,10 +66,9 @@ namespace simpleengine {
         int fps_limit = -1;
         bool enable_vsync = true;
 
-        int max_engine_tps = 60; // The maximum engine TPS
-        double tps_accumulator = 0.f;
-        //int engine_ticks_second = 0; // The amount of ticks in a second
-        //double last_sec_engine_tick; // The time of the last second
+        int max_engine_tps = 120; // The maximum engine TPS
+        float fixed_delta_time = 1.f / (float) max_engine_tps; // The delta time from fixed timestep
+        float tps_accumulator = 0.f;
 
         float get_delta_time();
 
diff --git a/src/game.cpp b/src/game.cpp
index 22a6573..bab41da 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -158,33 +158,31 @@ void simpleengine::Game::limit_framerate(const float& delta_time) const {
 int simpleengine::Game::run() {
     while (!glfwWindowShouldClose(window)) {
         // Get delta time first thing
-        float delta_time = get_delta_time();
-        //std::cout << "Delta time: " << delta_time << std::endl;
+        float frame_time = get_delta_time();
 
         // Poll input events
         glfwPollEvents();
+        input_update(frame_time); // Update input on varying timestep
 
-        const double max_delta_time = 0.25;
+        tps_accumulator += frame_time;
 
-        tps_accumulator += delta_time;
+        // https://gafferongames.com/post/fix_your_timestep/
+        while (tps_accumulator >= fixed_delta_time) {
+            update(fixed_delta_time);
 
-        input_update(delta_time);
-
-        while (tps_accumulator >= max_delta_time) {
-            update(max_delta_time);
-
-            tps_accumulator -= max_delta_time;
+            tps_accumulator -= fixed_delta_time;
         }
-
-        const double interpolate_alpha = tps_accumulator / max_delta_time;
         
-        render_window(interpolate_alpha, delta_time);
+        // Alpha used for interpolating objects in rendering
+        float interpolate_alpha = tps_accumulator / fixed_delta_time;
+
+        render_window(interpolate_alpha, frame_time);
 
         // End draw
         glfwSwapBuffers(window);
         glFlush();
         
-        limit_framerate(delta_time);
+        limit_framerate(frame_time);
     }
 
     return 0;