From 198f7e1269bdd7a7f8c84c351248adf3a72c1554 Mon Sep 17 00:00:00 2001
From: Lauchmelder <robert.altner11@gmail.com>
Date: Fri, 18 Feb 2022 16:28:20 +0100
Subject: [PATCH] added imgui

---
 .gitmodules         |  3 +++
 CMakeLists.txt      | 13 +++++++++++++
 src/Application.cpp | 31 ++++++++++++++++++++++++++++---
 src/Application.hpp |  2 ++
 src/CMakeLists.txt  |  5 +++++
 src/Canvas.cpp      |  2 +-
 src/Window.cpp      |  7 +++++++
 src/Window.hpp      |  2 ++
 vendor/imgui        |  1 +
 9 files changed, 62 insertions(+), 4 deletions(-)
 create mode 160000 vendor/imgui

diff --git a/.gitmodules b/.gitmodules
index 2cf019a..d6e3e1f 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "vendor/glfw"]
 	path = vendor/glfw
 	url = git@github.com:glfw/glfw.git
+[submodule "vendor/imgui"]
+	path = vendor/imgui
+	url = git@github.com:ocornut/imgui.git
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9b78510..0e1e093 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,6 +5,19 @@ cmake_minimum_required (VERSION 3.8)
 
 project ("Mandelbrot")
 
+set(IMGUI_SOURCE_DIR "${CMAKE_SOURCE_DIR}/vendor/imgui")
+
+set(IMGUI_INCLUDE_DIRS ${IMGUI_SOURCE_DIR})
+set(IMGUI_SOURCE_FILES 
+	"${IMGUI_SOURCE_DIR}/imgui.cpp" 
+	"${IMGUI_SOURCE_DIR}/imgui_demo.cpp" 
+	"${IMGUI_SOURCE_DIR}/imgui_draw.cpp"
+	"${IMGUI_SOURCE_DIR}/imgui_tables.cpp"
+	"${IMGUI_SOURCE_DIR}/imgui_widgets.cpp"
+	"${IMGUI_SOURCE_DIR}/backends/imgui_impl_opengl3.cpp"
+	"${IMGUI_SOURCE_DIR}/backends/imgui_impl_glfw.cpp"
+)
+
 # Include sub-projects.
 add_subdirectory ("vendor/glfw")
 add_subdirectory ("vendor/glad")
diff --git a/src/Application.cpp b/src/Application.cpp
index 9cf2779..5e2c03f 100644
--- a/src/Application.cpp
+++ b/src/Application.cpp
@@ -3,8 +3,11 @@
 
 #include <stdexcept>
 
+#include "backends/imgui_impl_glfw.h"
+#include "backends/imgui_impl_opengl3.h"
+
 Application::Application() :
-	window(new Window(1280, 720, "Mandelbrot")), canvas(nullptr)
+	window(new Window(1280, 720, "Mandelbrot")), canvas(nullptr), backgroundColor{ 0.1f, 0.01f, 0.19f }
 {
 	window->MakeContextCurrent();
 
@@ -16,10 +19,22 @@ Application::Application() :
 	glViewport(0, 0, 1280, 720);
 
 	canvas = new Canvas();
+
+	IMGUI_CHECKVERSION();
+	ImGui::CreateContext();
+	ImGuiIO& io = ImGui::GetIO();
+
+	window->InitImGui();
+	ImGui_ImplOpenGL3_Init("#version 460 core");
+
+	ImGui::StyleColorsDark();
 }
 
 Application::~Application()
 {
+	ImGui_ImplOpenGL3_Shutdown();
+	ImGui_ImplGlfw_Shutdown();
+	ImGui::DestroyContext();
 }
 
 void Application::Launch()
@@ -27,12 +42,22 @@ void Application::Launch()
 	while (!window->ShouldClose())
 	{
 		glfwPollEvents();
-
-		glClearColor(0.1f, 0.01f, 0.19f, 1.0f);
+		glClearColor(backgroundColor[0], backgroundColor[1], backgroundColor[2], 1.0f);
 		glClear(GL_COLOR_BUFFER_BIT);
 
+		ImGui_ImplOpenGL3_NewFrame();
+		ImGui_ImplGlfw_NewFrame();
+		ImGui::NewFrame();
+
 		canvas->Render();
 
+		ImGui::Begin("Settings");
+		ImGui::SliderFloat3("Background Color", backgroundColor, 0.0f, 1.0f);
+		ImGui::End();
+
+		ImGui::Render();
+		ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+
 		window->Display();
 	}
 }
diff --git a/src/Application.hpp b/src/Application.hpp
index bd0def6..9434547 100644
--- a/src/Application.hpp
+++ b/src/Application.hpp
@@ -14,4 +14,6 @@ public:
 private:
 	Window* window;
 	Canvas* canvas;
+
+	float backgroundColor[3];
 };
\ No newline at end of file
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 91e8a16..224d12f 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -6,9 +6,14 @@ cmake_minimum_required (VERSION 3.8)
 # Add source to this project's executable.
 add_executable (Mandelbrot "main.cpp" "Window.cpp" "Application.cpp" "Canvas.cpp")
 
+target_sources(Mandelbrot PRIVATE
+	${IMGUI_SOURCE_FILES}
+)
+
 target_include_directories(Mandelbrot PRIVATE
 	glfw
 	glad
+	${IMGUI_INCLUDE_DIRS}
 )
 
 target_link_libraries(Mandelbrot
diff --git a/src/Canvas.cpp b/src/Canvas.cpp
index 17de5d1..2928c31 100644
--- a/src/Canvas.cpp
+++ b/src/Canvas.cpp
@@ -90,7 +90,7 @@ void Canvas::CreateShaderProgram()
 
 		void main()
 		{
-			FragColor = vec4(1.0f, 0.0f, 1.0f, 1.0f);
+			FragColor = vec4(0.1f, 0.3f, 0.3f, 1.0f);
 		}
 	)";
 	shaderSourceCString = fragmentShaderSource.c_str();
diff --git a/src/Window.cpp b/src/Window.cpp
index 2ddd9ab..91eee50 100644
--- a/src/Window.cpp
+++ b/src/Window.cpp
@@ -3,6 +3,8 @@
 
 #include <stdexcept>
 
+#include <backends/imgui_impl_glfw.h>
+
 Window::Window(uint32_t width, uint32_t height, const std::string& title) :
 	handle(nullptr)
 {
@@ -34,3 +36,8 @@ void Window::Display()
 {
 	glfwSwapBuffers(handle);
 }
+
+void Window::InitImGui()
+{
+	ImGui_ImplGlfw_InitForOpenGL(handle, true);
+}
diff --git a/src/Window.hpp b/src/Window.hpp
index b411c68..540b6df 100644
--- a/src/Window.hpp
+++ b/src/Window.hpp
@@ -14,6 +14,8 @@ public:
 	inline void MakeContextCurrent() { glfwMakeContextCurrent(handle); }
 	void Display();
 
+	void InitImGui();
+
 private:
 	GLFWwindow* handle;
 };
\ No newline at end of file
diff --git a/vendor/imgui b/vendor/imgui
new file mode 160000
index 0000000..29d462e
--- /dev/null
+++ b/vendor/imgui
@@ -0,0 +1 @@
+Subproject commit 29d462ebce0275345a6ce4621d8fff0ded57c9e5