Update .gitlab-ci.yml file

Bind attribute location

See merge request jack/terravisor!4

.gitlab-ci.yml

@@ -7,6 +7,7 @@ stages:
 
 variables:
   VCPKG_ROOT: "/vcpkg"
+  CMAKE_BUILD_TYPE: "Release"
 
 build:
   stage: build
@@ -32,4 +33,4 @@ run_tests:
     - export DISPLAY=:99
     - export TEST_MODE=1
     - cd build
-    - ./TerraVisor
+    - ./TerraVisor

CHANGELOG.md

@@ -0,0 +1,11 @@
+## [v0.0.2] - 2024-08-25
+### Changed
+- Refactored uniform handling in the initial geometry pass to improve maintainability.
+
+## [v0.0.3] - 2024-08-28
+### Changed
+- Correctly manage window resizing for camera aspect ratio
+
+## [v0.0.4] - 2024-08-28
+### Changed
+- Added dynamic tessellation determined by the slope of the terrain

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.10)
-project(TerraVisor VERSION 0.0.1)
+project(TerraVisor VERSION 0.0.4)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)

imgui.ini

@@ -4,8 +4,8 @@ Size=400,400
 Collapsed=0
 
 [Window][Terrain Controls]
-Pos=877,19
-Size=403,701
+Pos=861,19
+Size=419,701
 Collapsed=0
 DockId=0x00000002,0
 
@@ -19,17 +19,31 @@ Collapsed=0
 
 [Window][TerraVisor]
 Pos=0,0
-Size=1280,720
+Size=2880,1676
 Collapsed=0
 
 [Window][Scene Window]
 Pos=0,19
-Size=875,701
+Size=859,701
 Collapsed=0
-DockId=0x00000001,0
+DockId=0x00000003,0
+
+[Window][Viewport]
+Pos=0,34
+Size=2178,1641
+Collapsed=0
+DockId=0x00000003,0
+
+[Window][Scene Settings]
+Pos=2181,34
+Size=699,1641
+Collapsed=0
+DockId=0x00000004,0
 
 [Docking][Data]
-DockSpace   ID=0x6F42A598 Window=0xE80F322C Pos=0,19 Size=1280,701 Split=X Selected=0x9F2D9299
-  DockNode  ID=0x00000001 Parent=0x6F42A598 SizeRef=875,701 CentralNode=1 Selected=0x9F2D9299
-  DockNode  ID=0x00000002 Parent=0x6F42A598 SizeRef=403,701 Selected=0xF69494A7
+DockSpace     ID=0x6F42A598 Window=0xE80F322C Pos=0,34 Size=2880,1641 Split=X Selected=0x9F2D9299
+  DockNode    ID=0x00000001 Parent=0x6F42A598 SizeRef=0,0 Split=X Selected=0x13926F0B
+    DockNode  ID=0x00000003 Parent=0x00000001 SizeRef=578,701 CentralNode=1 Selected=0x13926F0B
+    DockNode  ID=0x00000004 Parent=0x00000001 SizeRef=699,701 Selected=0x413E6147
+  DockNode    ID=0x00000002 Parent=0x6F42A598 SizeRef=419,701 Selected=0xF69494A7
 

include/fbo.h

@@ -13,6 +13,7 @@ struct Framebuffer {
 
 namespace FBO {
     Framebuffer GenerateFramebuffer(int width, int height);
+    void UpdateFrameBuffer(Framebuffer& fbo, int width, int height);
     void Bind(const Framebuffer& fbo);
     void Unbind();
     void Cleanup(const Framebuffer& fbo);

include/interface.h

@@ -0,0 +1,29 @@
+#ifndef INTERFACE_H_
+#define INTERFACE_H_
+
+#include <GLFW/glfw3.h>
+#include <imgui.h>
+#include <string>
+#include <vector>
+#include <functional>
+
+struct Window {
+    std::string name;
+    ImVec2 size;
+    ImVec2 position;
+    bool isOpen = true;
+
+    std::function<void()> renderContent;
+
+    Window(const std::string& name, std::function<void()> renderFunc)
+        : name(name), size(ImVec2(512, 512)), position(ImVec2(0, 0)), renderContent(renderFunc) {}
+};
+
+namespace Interface {
+    void ApplyUIScaling(GLFWwindow* window);
+    void AddWindow(std::vector<Window>& windows, const std::string& name, std::function<void()> renderFunc);
+    Window* GetWindowByName(std::vector<Window>& windows, const std::string& name);
+    void RenderWindows(std::vector<Window>& windows);
+}
+
+#endif // INTERFACE_H_

include/scene.h

@@ -8,6 +8,7 @@
 
 #include "fbo.h"
 #include "camera.h"
+#include "interface.h"
 
 struct Vertex {
     glm::vec3 position;
@@ -25,15 +26,21 @@ class Scene {
         void DrawGui(GLFWwindow* window); 
         void Idle();
         void ReloadShader();
+        void UpdateCamera();
+        void OnScreenResize(Window* viewport);
+        void UpdateViewport();
         std::vector<int16_t> LoadHGT(const std::string& filename, int width, int height);
 
         int window_width;
         int window_height;
+        
+        std::vector<Window> windows_;
 
     private:
         void InitBuffers();
         void InitQuadBuffers();
         void InitShaders();
+        void InitUI();
 
         Camera activeCamera_;
         Framebuffer geo_fbo_;
@@ -52,7 +59,6 @@ class Scene {
         glm::mat4 view_matrix_;
         glm::mat4 projection_matrix_;
 
-        void UpdateCamera();
         int16_t SwapEndian(int16_t val);
         GLuint CreateHeightmapTexture(std::vector<int16_t> data, int width, int height);
 };

shaders/tessellation_ctrl.glsl

@@ -24,21 +24,48 @@ in VS_OUT {
 out TC_OUT {
     vec3 position;
     vec2 texCoord;
+    float tessLevel;
 } tc_out[];
 
+float getHeight(vec2 uv) {
+    return texture(heightTexture, uv).r * displacementScale;
+}
+
+float calculateSlope() {
+    float step = 1.0f / (float(gridDensity) * maxTessellation + 1.0f);
+
+    // Find surrounding heights
+    float hLeft = getHeight(tc_in[gl_InvocationID].texCoord + vec2(-step, 0.0f));
+    float hRight = getHeight(tc_in[gl_InvocationID].texCoord + vec2(step, 0.0f));
+    float hUp = getHeight(tc_in[gl_InvocationID].texCoord + vec2(0.0f, step));
+    float hDown = getHeight(tc_in[gl_InvocationID].texCoord + vec2(0.0f, -step));
+
+    float slopeX = abs(hLeft - hRight) * displacementScale;
+    float slopeY = abs(hUp - hDown) * displacementScale;
+
+    float maxSlope = max(slopeX, slopeY);
+
+    return maxSlope;
+}
+
 void main() {
     // Pass through position and texture coordinates to the tessellation evaluation shader
     tc_out[gl_InvocationID].position = tc_in[gl_InvocationID].position;
     tc_out[gl_InvocationID].texCoord = tc_in[gl_InvocationID].texCoord;
 
+    float slope = calculateSlope();
+    float tessLevel = tessellationFactor * (1.0f + slope * 10.0f);
+    tessLevel = max(tessLevel, maxTessellation);
+    tc_out[gl_InvocationID].tessLevel = tessLevel;
+
     // Set tessellation levels
     if (gl_InvocationID == 0) {
-        gl_TessLevelOuter[0] = maxTessellation; 
-        gl_TessLevelOuter[1] = maxTessellation; 
-        gl_TessLevelOuter[2] = maxTessellation; 
-        gl_TessLevelOuter[3] = maxTessellation; 
+        gl_TessLevelOuter[0] = tessLevel; 
+        gl_TessLevelOuter[1] = tessLevel; 
+        gl_TessLevelOuter[2] = tessLevel; 
+        gl_TessLevelOuter[3] = tessLevel; 
 
-        gl_TessLevelInner[0] = maxTessellation; 
-        gl_TessLevelInner[1] = maxTessellation; 
+        gl_TessLevelInner[0] = tessLevel; 
+        gl_TessLevelInner[1] = tessLevel; 
     }
 }

shaders/tessellation_eval.glsl

@@ -18,6 +18,7 @@ layout(std140, binding = 4) uniform GeoUniforms
 in TC_OUT {
     vec3 position;
     vec2 texCoord;
+    float tessLevel;
 } te_in[];
 
 out TE_OUT {
@@ -30,19 +31,25 @@ float getHeight(vec2 uv) {
     return texture(heightTexture, uv).r * displacementScale;
 }
 
+float getNeighbor(float tessFactor) {
+    return (float(gridDensity) * tessFactor + 1.0f);
+}
+
 vec3 calculateSmoothNormal(vec3 pos, vec2 coord) {
     // Currently hardcoded to match patch density
-    float step = 1.0f / (float(gridDensity) * maxTessellation + 1.0f);
+    //float step = 1.0f / (float(gridDensity) * tessLevel + 1.0f);
+    float stepU = 1.0f / (float(gridDensity) * gl_TessLevelInner[0]);
+    float stepV = 1.0f / (float(gridDensity) * gl_TessLevelInner[1]);
 
     // Find surrounding heights
-    float hLeft = getHeight(coord + vec2(-step, 0.0f));
-    float hRight = getHeight(coord + vec2(step, 0.0f));
-    float hUp = getHeight(coord + vec2(0.0f, step));
-    float hDown = getHeight(coord + vec2(0.0f, -step));
+    float hLeft = getHeight(coord + vec2(-stepU, 0.0f));
+    float hRight = getHeight(coord + vec2(stepU, 0.0f));
+    float hUp = getHeight(coord + vec2(0.0f, stepV));
+    float hDown = getHeight(coord + vec2(0.0f, -stepV));
     
     // Calculate tangents
-    vec3 tangentX = normalize(vec3(step, hRight - hLeft, 0.0));
-    vec3 tangentY = normalize(vec3(0.0, hUp - hDown, step));
+    vec3 tangentX = normalize(vec3(stepU, hRight - hLeft, 0.0));
+    vec3 tangentY = normalize(vec3(0.0, hUp - hDown, stepV));
 
     return normalize(cross(tangentY, tangentX));
 }

source/callbacks.cpp

@@ -1,6 +1,7 @@
 #include <glm/glm.hpp>
 
 #include "callbacks.h"
+#include "interface.h"
 
 namespace Callbacks {
    Scene* scene_ = nullptr;
@@ -52,11 +53,17 @@ void Callbacks::MouseButton(GLFWwindow* window, int button, int action, int mods
 
 void Callbacks::Resize(GLFWwindow* window, int width, int height)
 {
-   width = glm::max(1, width);
-   height = glm::max(1, height);
-   //Set viewport to cover entire framebuffer
-   glViewport(0, 0, width, height);
+   Window* viewport = Interface::GetWindowByName(scene_->windows_, "Viewport");
+
+   scene_->window_width = static_cast<int>(viewport->size.x);
+   scene_->window_height = static_cast<int>(viewport->size.y);
+   
+   scene_->OnScreenResize(viewport);
+
    //Set aspect ratio used in view matrix calculation
+   // scene_->window_width = width;
+   // scene_->window_height = height;
+   // scene_->Scene::UpdateCamera();
    //Scene::Camera::Aspect = float(width) / float(height);
    //Scene::Camera::UpdateP();
 }

source/fbo.cpp

@@ -54,6 +54,13 @@ namespace FBO {
     Framebuffer GenerateFramebuffer(int width, int height) {
         Framebuffer fbo;
         fbo.id = CreateFramebuffer();
+        
+        UpdateFrameBuffer(fbo, width, height);
+
+        return fbo;
+    }
+
+    void UpdateFrameBuffer(Framebuffer& fbo, int width, int height) {
         glBindFramebuffer(GL_FRAMEBUFFER, fbo.id);
 
         fbo.albedoTexture = CreateTexture(width, height, GL_RGBA);
@@ -73,8 +80,6 @@ namespace FBO {
         }
 
         glBindFramebuffer(GL_FRAMEBUFFER, 0);
-
-        return fbo;
     }
 
     void Bind(const Framebuffer& fbo) {

source/interface.cpp

@@ -0,0 +1,107 @@
+#include "interface.h"
+
+#include <imgui_impl_glfw.h>
+#include <imgui_impl_opengl3.h>
+#include <algorithm>
+#include <iostream>
+#include <filesystem>
+
+namespace Interface {
+
+void ApplyUIScaling(GLFWwindow* window) {
+    float xScale, yScale;
+    glfwGetWindowContentScale(window, &xScale, &yScale);
+
+    float scale = (xScale + yScale) * 0.5f;
+
+    ImGui::GetIO().FontGlobalScale = scale;
+    ImGuiStyle& style = ImGui::GetStyle();
+    style.ScaleAllSizes(scale);
+
+    ImGuiIO& io = ImGui::GetIO();
+    io.Fonts->Clear();
+
+#ifdef _WIN32
+    io.Fonts->AddFontFromFileTTF("imgui/misc/fonts/JetBrainsMono/JetBrainsMono-Medium.ttf", 8.0f * scale);
+#else
+    io.Fonts->AddFontFromFileTTF("../imgui/misc/fonts/JetBrainsMono/JetBrainsMono-Medium.ttf", 8.0f * scale);
+#endif
+    io.Fonts->Build();
+}
+
+void AddWindow(std::vector<Window>& windows, const std::string& name, std::function<void()> renderFunc) {
+    windows.emplace_back(name, renderFunc);
+}
+
+Window* GetWindowByName(std::vector<Window>& windows, const std::string& name) {
+    auto it = std::find_if(windows.begin(), windows.end(), [&name](const Window& window) {
+        return window.name == name;
+    });
+
+    if (it != windows.end()) {
+        return &(*it); // Return pointer to the found window
+    } else {
+        return nullptr; // Return nullptr if the window was not found
+    }
+}
+
+void RenderWindows(std::vector<Window>& windows) {
+    ImGui_ImplOpenGL3_NewFrame();
+    ImGui_ImplGlfw_NewFrame();
+
+    ImGuiIO& io = ImGui::GetIO();
+    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
+
+    ImGui::NewFrame();
+
+    static ImGuiDockNodeFlags dockspace_flags = ImGuiDockNodeFlags_PassthruCentralNode;
+    ImGuiWindowFlags window_flags = ImGuiWindowFlags_MenuBar | ImGuiWindowFlags_NoDocking;
+
+    // Style windows
+    const ImGuiViewport* viewport = ImGui::GetMainViewport();
+    ImGui::SetNextWindowPos(viewport->WorkPos);
+    ImGui::SetNextWindowSize(viewport->WorkSize);
+    ImGui::SetNextWindowViewport(viewport->ID);
+    ImGui::PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
+    ImGui::PushStyleVar(ImGuiStyleVar_WindowBorderSize, 0.0f);
+    window_flags |= ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove;
+    window_flags |= ImGuiWindowFlags_NoBringToFrontOnFocus | ImGuiWindowFlags_NoNavFocus;
+    window_flags |= ImGuiWindowFlags_NoBackground;
+
+    ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0.0f, 0.0f));
+    ImGui::Begin("TerraVisor", nullptr, window_flags);
+    ImGui::PopStyleVar(3);
+
+    // Submit the DockSpace
+    if (io.ConfigFlags & ImGuiConfigFlags_DockingEnable) {
+        ImGuiID dockspace_id = ImGui::GetID("MyDockSpace");
+        ImGui::DockSpace(dockspace_id, ImVec2(0.0f, 0.0f), dockspace_flags);
+    }
+
+    if (ImGui::BeginMenuBar()) {
+        if (ImGui::BeginMenu("Options")) {
+            ImGui::Text("Nothing Here Yet, Check Back Later!");
+
+            ImGui::EndMenu();
+        }
+
+        ImGui::EndMenuBar();
+    }
+
+    ImGui::End();
+
+    for (auto& window : windows) {
+        if (window.isOpen && ImGui::Begin(window.name.c_str(), &window.isOpen)) {
+            window.size = ImGui::GetWindowSize();
+            window.position = ImGui::GetWindowPos();
+            if (window.renderContent) {
+                window.renderContent();
+            }
+        }
+        ImGui::End();
+    }
+
+    ImGui::Render();
+    ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+}
+}

source/main.cpp

@@ -42,6 +42,7 @@
 #include "config.h"
 #include "callbacks.h"
 #include "scene.h"
+#include "interface.h"
 
 namespace {
 
@@ -156,6 +157,7 @@ int main() {
     scene.Init();
     InitializeImGui(window);
     FreeImage_Initialise();
+    Interface::ApplyUIScaling(window);
 
     // Check if we're in test mode
     const char* testEnv = std::getenv("TEST_MODE");

source/scene.cpp

@@ -9,10 +9,6 @@
 #include <glm/gtx/transform.hpp>
 #include <glm/gtc/type_ptr.hpp>
 
-#include <imgui.h>
-#include <imgui_impl_glfw.h>
-#include <imgui_impl_opengl3.h>
-
 #include <iostream>
 #include <fstream>
 #include <sstream>
@@ -29,6 +25,7 @@
 #include "InitShader.h" 
 #include "DebugCallback.h"
 #include "load_texture.h"
+#include "interface.h"
 
 namespace {
 
@@ -91,6 +88,7 @@ void Scene::Init() {
     InitBuffers();
     ReloadShader();
     InitQuadBuffers();
+    InitUI();
 
     CameraControls::SetPosition(activeCamera_, glm::vec3(1.4f, 1.4f, 0.0f));
     CameraControls::SetRotation(activeCamera_, -glm::normalize(CameraControls::GetPosition(activeCamera_)));
@@ -197,6 +195,25 @@ void Scene::InitQuadBuffers() {
     glBindVertexArray(0);
 }
 
+void Scene::InitUI() {
+    Interface::AddWindow(windows_, "Viewport", [this]() {
+        ImGui::Image((void*)(intptr_t)lht_fbo_.albedoTexture, ImVec2(window_width, window_height), ImVec2(0, 1), ImVec2(1, 0));
+    });
+
+    Interface::AddWindow(windows_, "Scene Settings", [this]() {
+        // if (ImGui::Button("Quit")) {
+        //     glfwSetWindowShouldClose(window, GLFW_TRUE);
+        // }
+
+        ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
+
+        ImGui::SliderFloat("Tessellation Level", &Uniforms::GeoData.maxTessellation, 1.0f, 64.0f);
+        ImGui::SliderInt("Patch Grid Density", &Uniforms::GeoData.gridDensity, 1, 24);
+        ImGui::SliderFloat("Max Height", &Uniforms::GeoData.displacementScale, 0.0f, 1.0f);
+        Window* viewport = Interface::GetWindowByName(windows_, "Viewport");
+        ImGui::Text("Viewport size: (%.3f, %.3f)", viewport->size.x, viewport->size.y);
+    });
+}
 
 // Allows for runtime shader updates
 void Scene::ReloadShader() {
@@ -223,7 +240,12 @@ void Scene::Display(GLFWwindow* window) {
 
     glUseProgram(shader_program_);
 
-    //glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+    // glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+    
+    Window* viewport = Interface::GetWindowByName(windows_, "Viewport");
+    if (viewport && viewport->size.x > 0 && viewport->size.y > 0) {
+        OnScreenResize(viewport);
+    }
 
     Uniforms::GeoData.PV = projection_matrix_ * CameraControls::GetViewMatrix(activeCamera_); // Projection-View matrix
     Uniforms::BufferSceneData();
@@ -247,7 +269,9 @@ void Scene::Display(GLFWwindow* window) {
     glPatchParameteri(GL_PATCH_VERTICES, 4);
     glDrawElements(GL_PATCHES, indices.size(), GL_UNSIGNED_INT, 0);
 
-    //glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+    FBO::Unbind();
+
+    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 
     FBO::Bind(lht_fbo_);
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
@@ -274,79 +298,24 @@ void Scene::Display(GLFWwindow* window) {
 
     FBO::Unbind();
 
-    DrawGui(window);
+    //DrawGui(window);
+    Interface::RenderWindows(windows_);
     glfwSwapBuffers(window);
 }
 
-void Scene::DrawGui(GLFWwindow* window) {
-    // Begin ImGui frame
-    ImGui_ImplOpenGL3_NewFrame();
-    ImGui_ImplGlfw_NewFrame();
+void Scene::OnScreenResize(Window* viewport) {
+    if (window_width != static_cast<int>(viewport->size.x) || window_height != static_cast<int>(viewport->size.y)) {
+        window_width = static_cast<int>(viewport->size.x);
+        window_height = static_cast<int>(viewport->size.y);
 
-    // Enable docking
-    ImGuiIO& io = ImGui::GetIO();
-    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
-
-    ImGui::NewFrame();
-
-    static ImGuiDockNodeFlags dockspace_flags = ImGuiDockNodeFlags_PassthruCentralNode;
-
-    // Add menu bar
-    ImGuiWindowFlags window_flags = ImGuiWindowFlags_MenuBar | ImGuiWindowFlags_NoDocking;
-
-    // Style windows
-    const ImGuiViewport* viewport = ImGui::GetMainViewport();
-    ImGui::SetNextWindowPos(viewport->WorkPos);
-    ImGui::SetNextWindowSize(viewport->WorkSize);
-    ImGui::SetNextWindowViewport(viewport->ID);
-    ImGui::PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
-    ImGui::PushStyleVar(ImGuiStyleVar_WindowBorderSize, 0.0f);
-    window_flags |= ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove;
-    window_flags |= ImGuiWindowFlags_NoBringToFrontOnFocus | ImGuiWindowFlags_NoNavFocus;
-    window_flags |= ImGuiWindowFlags_NoBackground;
-
-    ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0.0f, 0.0f));
-    ImGui::Begin("TerraVisor", nullptr, window_flags);
-    ImGui::PopStyleVar(3);
-
-    // Submit the DockSpace
-    if (io.ConfigFlags & ImGuiConfigFlags_DockingEnable) {
-        ImGuiID dockspace_id = ImGui::GetID("MyDockSpace");
-        ImGui::DockSpace(dockspace_id, ImVec2(0.0f, 0.0f), dockspace_flags);
+        UpdateCamera();
     }
+}
 
-    if (ImGui::BeginMenuBar()) {
-        if (ImGui::BeginMenu("Options")) {
-            ImGui::Text("Nothing Here Yet, Check Back Later!");
-
-            ImGui::EndMenu();
-        }
-
-        ImGui::EndMenuBar();
-    }
-
-    ImGui::End();
-
-    // Draw Gui
-    ImGui::Begin("Terrain Controls");
-    if (ImGui::Button("Quit")) {
-        glfwSetWindowShouldClose(window, GLFW_TRUE);
-    }
-
-    ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
-
-    ImGui::SliderFloat("Tessellation Level", &Uniforms::GeoData.maxTessellation, 1.0f, 64.0f);
-    ImGui::SliderInt("Patch Grid Density", &Uniforms::GeoData.gridDensity, 1, 24);
-    ImGui::End();
-
-    // Draw FBO to ImGui window
-    ImGui::Begin("Scene Window");
-    ImVec2 windowSize = ImGui::GetContentRegionAvail();
-    ImGui::Image((void*)(intptr_t)lht_fbo_.albedoTexture, windowSize, ImVec2(0, 1), ImVec2(1, 0));
-    ImGui::End();
-
-    ImGui::Render();
-    ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+void Scene::UpdateViewport() {
+    window_width = ImGui::GetWindowSize().x;
+    window_height = ImGui::GetWindowSize().y;
+    UpdateCamera();
 }
 
 void Scene::Idle() {
@@ -383,7 +352,7 @@ std::vector<int16_t> Scene::LoadHGT(const std::string& filename, int width, int
 }
 
 void Scene::UpdateCamera() {
-    projection_matrix_ = glm::perspective(CameraControls::GetFOV(activeCamera_), aspect_, activeCamera_.nearPlane, activeCamera_.farPlane);
+    projection_matrix_ = glm::perspective(CameraControls::GetFOV(activeCamera_), static_cast<float>(window_width) / window_height, activeCamera_.nearPlane, activeCamera_.farPlane);
 }
 
 GLuint Scene::CreateHeightmapTexture(std::vector<int16_t> data, int width, int height) {