OpenGL渲染器03_OpenGL环境

cd glfw-3.3.5
mkdir build
cd build
# 这里需要../  在CMakeLists.txt目录下进行cmake才可以。 
# -G这里是要创建MinGW的Makefile
# -BUILD_SHARED_LIBS=true 生成.dll
cmake ../ -G "MinGW Makefiles" -BUILD_SHARED_LIBS=true

mingw32-make install #install 默认会将文件写到 C:\Program Files (x86)\GLFW 中去

// 定义函数原型
typedef void (*GL_GENBUFFERS) (GLsizei, GLuint*);
// 找到正确的函数并赋值给函数指针
GL_GENBUFFERS glGenBuffers  = (GL_GENBUFFERS)wglGetProcAddress("glGenBuffers");
// 现在函数可以被正常调用了
GLuint buffer;
glGenBuffers(1, &buffer);

GLuint buffer;
glGenBuffers(1, &buffer);

# 版本号限定 可选
cmake_minimum_required(VERSION 3.0)
# 项目名称
project(00_setup_environment2)

# 文件复制
file(COPY lib/glfw3.dll DESTINATION ./)

# 源码
aux_source_directory(src/ SOURCE)

# 设置包含目录
include_directories(${PROJECT_SOURCE_DIR}/include)

# 可执行程序
add_executable(${PROJECT_NAME} ${SOURCE})

# 设置需要的链接库，导入glfw3.dll
link_directories(${PROJECT_SOURCE_DIR}/lib)
target_link_libraries(${PROJECT_NAME} ${PROJECT_SOURCE_DIR}/lib/glfw3.dll

glfwInit();
// 主版本 3.3，所以MAJOR=3,MINOR=3
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
// 次版本
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
// 使用核心模式
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

//设置窗口宽高、名称
GLFWwindow* pWindow = glfwCreateWindow(WIN_WINDTH, WIN_HEIGHT, "hello opengl中文!", nullptr, nullptr);
//上下文设置
glfwMakeContextCurrent(pWindow);

bool bLoadSuc = gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
if(!bLoadSuc){
    std::cout << "Failed glad load glProcAddress!" << std::endl;
    return -1;
}

// 4.主循环
while (!glfwWindowShouldClose(pWindow)) {

	//渲染
	//draw scene.

	//交换缓存
	glfwSwapBuffers(pWindow);
	//事件处理
	glfwPollEvents();
}

glfwTerminate();

#include <iostream>

// glad.h 要放在glfw3.h之前
#include <glad/glad.h>
#include "GLFW/glfw3.h"

#define WIN_WINDTH 600
#define WIN_HEIGHT 600

int main(){
    std::cout<<"00_setup_environment2!"<<std::endl;
    // 1.初始化
    glfwInit();
    //主版本 3.3.5，所以MAJOR=3,MINOR=3
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    //次版本
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    //使用核心模式
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

    // 2.创建窗口 https://www.glfw.org/docs/latest/window_guide.html
    GLFWwindow* pWindow = glfwCreateWindow(WIN_WINDTH, WIN_HEIGHT, "hello opengl中文!", nullptr, nullptr);
    //上下文设置
    glfwMakeContextCurrent(pWindow);

    // 3.glad管理函数指针
    bool bLoadSuc = gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
    if(!bLoadSuc){
        std::cout << "Failed glad load glProcAddress!" << std::endl;
        return -1;
    }

    // 4.主循环
    while (!glfwWindowShouldClose(pWindow)) {

        //渲染
        //draw scene.

        //交换缓存
        glfwSwapBuffers(pWindow);
        //事件处理
        glfwPollEvents();
    }

    // 5.资源回收
    glfwTerminate();

    return 0;
}

# 版本号限定 可选
cmake_minimum_required(VERSION 3.0)
# 项目名称
project(00_setup_environment2)

# 资源文件复制
file(COPY lib/glfw3.dll DESTINATION ./)
# 字体文件
file(COPY resource DESTINATION ./) #update1. 新加的资源操作

# 源码
aux_source_directory(src/ SOURCE)

# 设置包含目录
set(DIR_INCLUDES ${PROJECT_SOURCE_DIR}/include) #update2. 这里创建一个变量，包含目录
include_directories(${DIR_INCLUDES}) #update3. 包含目录设置

# 可执行程序
add_executable(${PROJECT_NAME} ${SOURCE})

# 设置需要的链接库
link_directories(${PROJECT_SOURCE_DIR}/lib)
## Imgui update4.0 添加静态链接库
add_library(imgui STATIC
        ${DIR_INCLUDES}/imgui/imgui.cpp
        ${DIR_INCLUDES}/imgui/imgui_impl_glfw.cpp
        ${DIR_INCLUDES}/imgui/imgui_impl_opengl3.cpp
        ${DIR_INCLUDES}/imgui/imgui_draw.cpp
        ${DIR_INCLUDES}/imgui/imgui_demo.cpp
        ${DIR_INCLUDES}/imgui/imgui_tables.cpp
        ${DIR_INCLUDES}/imgui/imgui_widgets.cpp)
    target_link_libraries(${PROJECT_NAME} ${PROJECT_SOURCE_DIR}/lib/glfw3.dll imgui) #update5.0 添加imgui库

#include "imgui/imgui.h"
#include "imgui/imgui_impl_glfw.h"
#include "imgui/imgui_impl_opengl3.h"

// 检查版本
IMGUI_CHECKVERSION();
// 上下文
ImGui::CreateContext();
// 设置黑色主题
ImGui::StyleColorsDark();
// 嵌入住glfw上下文中
ImGui_ImplGlfw_InitForOpenGL(pWindow, true);
// OpenGL版本号3.3
ImGui_ImplOpenGL3_Init("#version 330");

ImGuiIO& io = ImGui::GetIO();
(void) io;
// 字体设置
io.Fonts->AddFontFromFileTTF("resource/fonts/Cousine-Regular.ttf", 13.0f, NULL, io.Fonts->GetGlyphRangesDefault());
io.Fonts->AddFontFromFileTTF("resource/fonts/DroidSans.ttf", 13.0f, NULL, io.Fonts->GetGlyphRangesDefault());
io.Fonts->AddFontFromFileTTF("resource/fonts/Karla-Regular.ttf", 13.0f, NULL, io.Fonts->GetGlyphRangesDefault());
io.Fonts->AddFontFromFileTTF("resource/fonts/ProggyClean.ttf", 13.0f, NULL, io.Fonts->GetGlyphRangesDefault());
io.Fonts->AddFontFromFileTTF("resource/fonts/Roboto-Medium.ttf", 13.0f, NULL, io.Fonts->GetGlyphRangesDefault());

// 1. ImGui渲染操作
ImGui_ImplOpenGL3_NewFrame();
ImGui_ImplGlfw_NewFrame();
ImGui::NewFrame();

// 2. UI准备（这里添加了一个ImGui默认提供的界面，可选）
bool bShowDemoWindow = true;// 控制UI是否渲染
// 显示ImGui自带的demo window
ImGui::ShowDemoWindow(&bShowDemoWindow);

// 3. 渲染
ImGui::Render();
ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());

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