example code for test imgui using glad and glfw

imgui_glad_glfw.cpp

#include "imgui/imgui.h"
#include "imgui/imgui_impl_glfw.h"
#include "imgui/imgui_impl_opengl3.h"
#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>
#include <string>

int main(void)
{
	GLFWwindow* window;

	/* Initialize the library */
	if (!glfwInit())
		return -1;

	/* Create a windowed mode window and its OpenGL context */
	window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
	if (!window)
	{
		glfwTerminate();
		return -1;
	}

	/* Make the window's context current */
	glfwMakeContextCurrent(window);

	if (gladLoadGL() == 0)
	{
		return -1;
	}

	// Setup Dear ImGui context
	IMGUI_CHECKVERSION();
	ImGui::CreateContext();
	ImGuiIO& io = ImGui::GetIO(); (void)io;
	io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
	io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls

	// Setup Dear ImGui style
	ImGui::StyleColorsDark();
	//ImGui::StyleColorsLight();

	// Setup Platform/Renderer backends
	ImGui_ImplGlfw_InitForOpenGL(window, true);
	ImGui_ImplOpenGL3_Init("#version 130");

	bool show_demo_window = true;
	bool show_another_window = false;
	ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);

	/* Loop until the user closes the window */
	while (!glfwWindowShouldClose(window))
	{
		/* Render here */
		glClear(GL_COLOR_BUFFER_BIT);

		/* Poll for and process events */
		glfwPollEvents();

		// Start the Dear ImGui frame
		ImGui_ImplOpenGL3_NewFrame();
		ImGui_ImplGlfw_NewFrame();
		ImGui::NewFrame();

		// 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
		if (show_demo_window)
			ImGui::ShowDemoWindow(&show_demo_window);

		// 2. Show a simple window that we create ourselves. We use a Begin/End pair to create a named window.
		{
			static float f = 0.0f;
			static int counter = 0;

			ImGui::Begin("Hello, world!");                          // Create a window called "Hello, world!" and append into it.

			ImGui::Text("This is some useful text.");               // Display some text (you can use a format strings too)
			ImGui::Checkbox("Demo Window", &show_demo_window);      // Edit bools storing our window open/close state
			ImGui::Checkbox("Another Window", &show_another_window);

			ImGui::SliderFloat("float", &f, 0.0f, 1.0f);            // Edit 1 float using a slider from 0.0f to 1.0f
			ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color

			if (ImGui::Button("Button"))                            // Buttons return true when clicked (most widgets return true when edited/activated)
				counter++;
			ImGui::SameLine();
			ImGui::Text("counter = %d", counter);

			ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / io.Framerate, io.Framerate);
			ImGui::End();
		}

		// 3. Show another simple window.
		if (show_another_window)
		{
			ImGui::Begin("Another Window", &show_another_window);   // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked)
			ImGui::Text("Hello from another window!");
			if (ImGui::Button("Close Me"))
				show_another_window = false;
			ImGui::End();
		}

		// 4. MineSweeper board
		{
			ImGui::Begin("MineSweeper Board");
			for (int i = 0; i < 9; i++)
			{
				for (int j = 0; j < 9; j++)
				{
					std::string buttonName = std::to_string(i) + "," + std::to_string(j);
					if (ImGui::Button(buttonName.c_str()))
					{
						std::cout << "LeftClick at row:" << i << " col:" << j << std::endl;
					}

					if (ImGui::IsItemHovered() && ImGui::IsMouseClicked(1))
					{
						std::cout << "RightClick at row:" << i << " col:" << j << std::endl;
					}

					ImGui::SameLine();
				}
				ImGui::NewLine();
			}
			ImGui::End();
		}

		// Rendering
		ImGui::Render();
		int display_w, display_h;
		glfwGetFramebufferSize(window, &display_w, &display_h);
		glViewport(0, 0, display_w, display_h);
		glClearColor(clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w);
		glClear(GL_COLOR_BUFFER_BIT);
		ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());

		glfwSwapBuffers(window);
	}

	// Cleanup
	ImGui_ImplOpenGL3_Shutdown();
	ImGui_ImplGlfw_Shutdown();
	ImGui::DestroyContext();

	glfwDestroyWindow(window);
	glfwTerminate();
	return 0;
}