一步一步跟我学ImGui.第一讲.配置OpenGl2+ImGui环境

opengl32.lib;glfw3.lib;%(AdditionalDependencies)

#include <stdio.h>
#include <Windows.h>
#include <tchar.h>

#ifdef __APPLE__
#define GL_SILENCE_DEPRECATION
#endif
#include <GLFW/glfw3.h>   //注意这个位置.你设置了目录直接这样引用就行.GLFW不是我们建立的文件夹.而是include里面的GLFW


static void glfw_error_callback(int error, const char* description)
{
	fprintf(stderr, "Glfw Error %d: %s\n", error, description);
}

int WINAPI _tWinMain(
	HINSTANCE hInstance,
	HINSTANCE hPrevInstance,
	LPTSTR lpCmdLine,
	int nCmdShow)
//int main()
{
	// Setup window
	//glfwSetErrorCallback(glfw_error_callback);
	//初始化OpenGl

	if (!glfwInit())
		return 1;

	//创建OpenGl窗口

	GLFWwindow* window = glfwCreateWindow(1280, 720, "IBinary", NULL, NULL);
	if (window == NULL)
		return 1;

	//设置上下文.以及进行交换.
	glfwMakeContextCurrent(window);
	glfwSwapInterval(1); // Enable vsync


	

	
	//开始进行循环.判断gl窗口是否关闭.不关闭一直循环.
	while (!glfwWindowShouldClose(window))
	{
		glfwPollEvents();            //创建接收事件,相当于消息循环.如果不加则不响应消息.


		
		
		//这些代码可以省略.加了这些代码是设置Open内部的窗口颜色什么的
			int display_w, display_h;
			glfwGetFramebufferSize(window, &display_w, &display_h);
			glViewport(0, 0, display_w, display_h);
			glClearColor(0.45f, 0.55f, 0.60f, 1.00f);
			glClear(GL_COLOR_BUFFER_BIT);

			glfwMakeContextCurrent(window);
			glfwSwapBuffers(window);
		

		// Cleanup

		
		

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

ImGui::Text("HelloWorld");

#include "imgui.h"
#include "imgui_impl_glfw.h"
#include "imgui_impl_opengl2.h"
#include <stdio.h>
#include <Windows.h>
#include <tchar.h>
#ifdef __APPLE__
#define GL_SILENCE_DEPRECATION
#endif
#include <GLFW/glfw3.h>

#if defined(_MSC_VER) && (_MSC_VER >= 1900) && !defined(IMGUI_DISABLE_WIN32_FUNCTIONS)
#pragma comment(lib, "legacy_stdio_definitions")
#endif



int WINAPI _tWinMain(
	HINSTANCE hInstance,
	HINSTANCE hPrevInstance,
	LPTSTR lpCmdLine,
	int nCmdShow)
{
	
	if (!glfwInit())   //初始化OpenGl
		return 1;

	//创建OpenGl窗口

	GLFWwindow* window = glfwCreateWindow(1280, 720, "Dear ImGui GLFW+OpenGL2 example", NULL, NULL);
	if (window == NULL)
		return 1;

	//设置OpenGl山下文
	glfwMakeContextCurrent(window);
	glfwSwapInterval(1); // Enable vsync

	// 设置ImGui舌下文.
	IMGUI_CHECKVERSION();
	ImGui::CreateContext();
	ImGuiIO& io = ImGui::GetIO(); (void)io;
	

	//设置颜色风格
	ImGui::StyleColorsDark();
	

	// Setup Platform/Renderer bindings
	ImGui_ImplGlfw_InitForOpenGL(window, true);
	ImGui_ImplOpenGL2_Init();

	ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);

	// Main loop
	while (!glfwWindowShouldClose(window))
	{
		
		glfwPollEvents();

		// Start the Dear ImGui frame 启动IMgui Frame框架.
		ImGui_ImplOpenGL2_NewFrame();
		ImGui_ImplGlfw_NewFrame();
		ImGui::NewFrame();

		
		{
			//开始绘制ImGui
			
			ImGui::Begin("IBinary Windows");                          // Create a window called "Hello, world!" and append into it.
			ImGui::Text("IBinary Blog");
			//ImGui::SameLine();
			ImGui::Indent(); //另起一行制表符开始绘制Button
			ImGui::Button("2222", ImVec2(100, 50));
		
			ImGui::End();
		}

		// 3. Show another simple window.
		
		// 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.y, clear_color.z, clear_color.w);
		glClear(GL_COLOR_BUFFER_BIT);
		
		
		ImGui_ImplOpenGL2_RenderDrawData(ImGui::GetDrawData()); //必须在绘制完Open之后接着绘制Imgui
		//glUseProgram(last_program);

		glfwMakeContextCurrent(window);
		glfwSwapBuffers(window);
	}

	// Cleanup
	ImGui_ImplOpenGL2_Shutdown();
	ImGui_ImplGlfw_Shutdown();
	ImGui::DestroyContext();

	glfwDestroyWindow(window);
	glfwTerminate();

	return 0;
}