From 7213b1865f54e6b2d3578c43953b3e7c5d2145da Mon Sep 17 00:00:00 2001
From: Joshua Goins <josh@redstrate.com>
Date: Sat, 17 May 2025 11:09:37 -0400
Subject: [PATCH] Make free camera movement in 3D views framerate-independent

This makes it way more tolerable to use when your framerate is super
low, like in the Map Editor.
---
 parts/mdl/vulkanwindow.cpp | 7 +++++--
 parts/mdl/vulkanwindow.h   | 2 ++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/parts/mdl/vulkanwindow.cpp b/parts/mdl/vulkanwindow.cpp
index 846f5db..5f406d7 100644
--- a/parts/mdl/vulkanwindow.cpp
+++ b/parts/mdl/vulkanwindow.cpp
@@ -185,6 +185,9 @@ void VulkanWindow::render()
         return;
     }
 
+    const float deltaTime = timer.nsecsElapsed() / 1000000000.0f;
+    timer.restart();
+
     ImGui::SetCurrentContext(m_renderer->ctx);
 
     auto &io = ImGui::GetIO();
@@ -221,8 +224,8 @@ void VulkanWindow::render()
         forward = normalize(glm::angleAxis(part->yaw, glm::vec3(0, 1, 0)) * glm::angleAxis(part->pitch, glm::vec3(1, 0, 0)) * glm::vec3(0, 0, 1));
         right = normalize(glm::angleAxis(part->yaw, glm::vec3(0, 1, 0)) * glm::vec3(1, 0, 0));
 
-        part->position += right * movX * 2.0f;
-        part->position += forward * movY * 2.0f;
+        part->position += right * movX * 50.0f * deltaTime;
+        part->position += forward * movY * 50.0f * deltaTime;
 
         m_renderer->camera.view = glm::mat4(1.0f);
         m_renderer->camera.view = glm::translate(m_renderer->camera.view, part->position);
diff --git a/parts/mdl/vulkanwindow.h b/parts/mdl/vulkanwindow.h
index 1014cf9..3133cd1 100644
--- a/parts/mdl/vulkanwindow.h
+++ b/parts/mdl/vulkanwindow.h
@@ -3,6 +3,7 @@
 
 #pragma once
 
+#include <QElapsedTimer>
 #include <QWindow>
 
 #include "imgui.h"
@@ -30,4 +31,5 @@ private:
     QVulkanInstance *m_instance;
     MDLPart *part;
     bool pressed_keys[4] = {};
+    QElapsedTimer timer;
 };