【JAVA】使用OPENGL

亦凉 2024-02-05 19:56 3阅读 0赞

从这个网址下载对应的库：

[LWJGL - Lightweight Java Game Library![icon-default.png?t=N7T8][icon-default.png_t_N7T8]https://www.lwjgl.org/browse/release/3.3.3][LWJGL - Lightweight Java Game Library_icon-default.png_t_N7T8_icon-default.png_t_N7T8_https_www.lwjgl.org_browse_release_3.3.3]下载这个压缩包（实际上有很多版本3.3.3是比较新的版本：[LWJGL - Lightweight Java Game Library][]）：

[https://build.lwjgl.org/release/3.3.3/lwjgl-3.3.3.zip][https_build.lwjgl.org_release_3.3.3_lwjgl-3.3.3.zip]

注意，下载的这个压缩包解压后，解压后，里边的jar包会比较多，使用IDE（我使用的IDEA）创建工程后，要把这些LWJGL的库添加到工程：

![bc79b869ecba40d2b425bd057dc304bb.png][]

这里是需要把整个解压目录里边所有Jar包添加进来，IDEA建立索引要花点时间，注意是子目录和子目录的Jar包：

![aa8fbe7fe4e5457c8b919363151470ef.png][]

如果上边这步没有问题，那么可以新建一个HelloWorld.java了，这里网站：

[LWJGL - Lightweight Java Game Library![icon-default.png?t=N7T8][icon-default.png_t_N7T8]https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/c4cb7bf8b2e846868ed6ddf3ed3423ef.png][LWJGL - Lightweight Java Game Library_icon-default.png_t_N7T8_icon-default.png_t_N7T8_https_www.lwjgl.org_guide]给了一个示例程序：

如果没有问题，运行的结果会是这样的：

![777afeb6d3a143f5ad41a6c72cae67dd.png][]

下边这个代码是画一条直线：

显示效果如下：

![5064aca5977a4f1abe0023740143bfd4.png][]

其实最终不是想画直线，目标是画3D图形，带放大，旋转，平移等等功能的。。。

这部分代码很多不生效的，测试旋转、平移，是可以的：

import org.lwjgl.*;
    import org.lwjgl.glfw.*;
    import org.lwjgl.opengl.*;
    import org.lwjgl.system.*;
    
    import java.nio.*;
    
    import static org.lwjgl.glfw.Callbacks.*;
    import static org.lwjgl.glfw.GLFW.*;
    import static org.lwjgl.opengl.GL32.*;
    import static org.lwjgl.system.MemoryStack.*;
    import static org.lwjgl.system.MemoryUtil.*;
    
    public class HelloWorld {
    
        // The window handle
        private long window;
    
        public void run() {
            System.out.println("Hello LWJGL " + Version.getVersion() + "!");
    
            init();
            loop();
            // Free the window callbacks and destroy the window
            glfwFreeCallbacks(window);
            glfwDestroyWindow(window);
    
            // Terminate GLFW and free the error callback
            glfwTerminate();
            glfwSetErrorCallback(null).free();
        }
    
        private void init() {
            // Setup an error callback. The default implementation
            // will print the error message in System.err.
            GLFWErrorCallback.createPrint(System.err).set();
    
            // Initialize GLFW. Most GLFW functions will not work before doing this.
            if ( !glfwInit() )
                throw new IllegalStateException("Unable to initialize GLFW");
    
            // Configure GLFW
            glfwDefaultWindowHints(); // optional, the current window hints are already the default
            glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE); // the window will stay hidden after creation
            glfwWindowHint(GLFW_RESIZABLE, GLFW_TRUE); // the window will be resizable
    
            // Create the window
            window = glfwCreateWindow(600, 600, "Hello World!", NULL, NULL);
            if ( window == NULL )
                throw new RuntimeException("Failed to create the GLFW window");
    
            // Setup a key callback. It will be called every time a key is pressed, repeated or released.
            glfwSetKeyCallback(window, (window, key, scancode, action, mods) -> {
                if ( key == GLFW_KEY_ESCAPE && action == GLFW_RELEASE )
                    glfwSetWindowShouldClose(window, true); // We will detect this in the rendering loop
            });
    
            // Get the thread stack and push a new frame
            try ( MemoryStack stack = stackPush() ) {
                IntBuffer pWidth = stack.mallocInt(1); // int*
                IntBuffer pHeight = stack.mallocInt(1); // int*
    
                // Get the window size passed to glfwCreateWindow
                glfwGetWindowSize(window, pWidth, pHeight);
    
                // Get the resolution of the primary monitor
                GLFWVidMode vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor());
    
                // Center the window
                glfwSetWindowPos(
                        window,
                        (vidmode.width() - pWidth.get(0)) / 2,
                        (vidmode.height() - pHeight.get(0)) / 2
                );
            } // the stack frame is popped automatically
    
            // Make the OpenGL context current
            glfwMakeContextCurrent(window);
            // Enable v-sync
            glfwSwapInterval(1);
    
            // Make the window visible
            glfwShowWindow(window);
        }
    
        private void loop() {
            GL.createCapabilities();
    
            float rTri = 0.5f;
            float rQuad = 1f;
    
            glClearColor(1.0f, 1.0f, 0.0f, 0.0f);
    
            glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); //清除屏幕和深度缓存
    
    
    
            //-----------------------------------------
            glLoadIdentity();   //重置当前的模型观察矩阵
            glTranslatef(0.1f, -0.2f, -0.20f); //平移矩阵
            glRotatef(30, 0.0f, 0.0f, 1.0f); //绕Z轴旋转30度
            glLineWidth(1);
            glColor3f(1f, 0f, 0f);
    
            glBegin(GL_LINES);
            glVertex2i(0, 0);
            glVertex2i(0, 1);
            glEnd();
    
            //-----------------------------------------
            glLoadIdentity();   //重置当前的模型观察矩阵
            glTranslatef(-1.5f, 0.0f, -116.0f);
    
            glRotatef(rTri, 0.0f, 1.0f, 0.0f); //绕Y轴旋转rTri度
    
            //开始绘制三角形
            glBegin(GL_TRIANGLES);
    
            //前侧面
            glColor3f(1.0f, 0.0f, 0.0f);
            glVertex3f(0.0f, 1.0f, 0.0f);      //上顶点
            glColor3f(0.0f, 1.0f, 0.0f);
            glVertex3f(-1.0f, -1.0f, 1.0f);    //左下顶点
            glColor3f(0.0f, 0.0f, 1.0f);
            glVertex3f(1.0f, -1.0f, 1.0f);     //右下顶点
    
            //右侧面
            glColor3f(1.0f, 0.0f, 0.0f);
            glVertex3f(0.0f, 1.0f, 0.0f);      //上顶点
            glColor3f(0.0f, 0.0f, 1.0f);
            glVertex3f(1.0f, -1.0f, 1.0f);     //左下顶点
            glColor3f(0.0f, 1.0f, 0.0f);
            glVertex3f(1.0f, -1.0f, -1.0f);    //右下顶点
    
            //后侧面
            glColor3f(1.0f, 0.0f, 0.0f);
            glVertex3f(0.0f, 1.0f, 0.0f);      //上顶点
            glColor3f(0.0f, 1.0f, 0.0f);
            glVertex3f(1.0f, -1.0f, -1.0f);    //左下顶点
            glColor3f(0.0f, 0.0f, 1.0f);
            glVertex3f(-1.0f, -1.0f, -1.0f);   //右下顶点
    
            //左侧面
            glColor3f(1.0f, 0.0f, 0.0f);
            glVertex3f(0.0f, 1.0f, 0.0f);      //上顶点
            glColor3f(0.0f, 0.0f, 1.0f);
            glVertex3f(-1.0f, -1.0f, -1.0f);   //左下顶点
            glColor3f(0.0f, 1.0f, 0.0f);
            glVertex3f(-1.0f, -1.0f, 1.0f);    //右下顶点
    
            glEnd();
            //绘制三角形结束
    
            //-----------------------------------------
            glLoadIdentity();   //重置当前的模型观察矩阵
    
            glTranslatef(-1.5f, 0.0f, -117.0f);	//越远的对象看起来越小
    
            glRotatef(30, 1.0f, 1.0f, 0.0f);    //绕X轴旋转rQuad度
    
            //开始绘制正方形
            glTranslatef(3.0f, 0.0f, 0.0f);
    
            glBegin(GL_QUADS);
    
            //顶面
            glColor3f(0.0f, 1.0f, 0.0f);
            glVertex3f(1.0f, 1.0f, -1.0f);     //右上顶点
            glVertex3f(-1.0f, 1.0f, -1.0f);    //左上顶点
            glVertex3f(-1.0f, 1.0f, 1.0f);     //左下顶点
            glVertex3f(1.0f, 1.0f, 1.0f);      //右下顶点
    
            //底面
            glColor3f(1.0f, 0.5f, 0.0f);
            glVertex3f(1.0f, -1.0f, 1.0f);     //右上顶点
            glVertex3f(-1.0f, -1.0f, 1.0f);    //左上顶点
            glVertex3f(-1.0f, -1.0f, -1.0f);   //左下顶点
            glVertex3f(1.0f, -1.0f, -1.0f);    //右下顶点
    
            //前面
            glColor3f(1.0f, 0.0f, 0.0f);
            glVertex3f(1.0f, 1.0f, 1.0f);      //右上顶点
            glVertex3f(-1.0f, 1.0f, 1.0f);     //左上顶点
            glVertex3f(-1.0f, -1.0f, 1.0f);    //左下顶点
            glVertex3f(1.0f, -1.0f, 1.0f);     //右下顶点
    
            //后面
            glColor3f(1.0f, 1.0f, 0.0f);
            glVertex3f(1.0f, -1.0f, -1.0f);    //右上顶点
            glVertex3f(-1.0f, -1.0f, -1.0f);   //左上顶点
            glVertex3f(-1.0f, 1.0f, -1.0f);    //左下顶点
            glVertex3f(1.0f, 1.0f, -1.0f);     //右下顶点
    
            //左侧面
            glColor3f(0.0f, 0.0f, 1.0f);
            glVertex3f(-1.0f, 1.0f, 1.0f);     //右上顶点
            glVertex3f(-1.0f, 1.0f, -1.0f);    //左上顶点
            glVertex3f(-1.0f, -1.0f, -1.0f);   //左下顶点
            glVertex3f(-1.0f, -1.0f, 1.0f);     //右下顶点
    
            //右侧面
            glColor3f(1.0f, 0.0f, 1.0f);
            glVertex3f(1.0f, 1.0f, -1.0f);     //右上顶点
            glVertex3f(1.0f, 1.0f, 1.0f);      //左上顶点
            glVertex3f(1.0f, -1.0f, 1.0f);     //左下顶点
            glVertex3f(1.0f, -1.0f, -1.0f);    //右下顶点
    
            glEnd();
            //绘制正方形结束
    
            //-----------------------------------------
            rTri += 5;
            rQuad += 5;
            //————————————————
            //版权声明：本文为CSDN博主「贝勒里恩」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
            //原文链接：https://blog.csdn.net/Mr_robot_strange/article/details/123682686
            glfwSwapBuffers(window);
            while (true)
            {
                glfwPollEvents();
            }
    
        }
    
        public static void main(String[] args) {
            new HelloWorld().run();
        }
    
    }

[icon-default.png_t_N7T8]: https://csdnimg.cn/release/blog_editor_html/release2.3.6/ckeditor/plugins/CsdnLink/icons/icon-default.png?t=N7T8
[LWJGL - Lightweight Java Game Library_icon-default.png_t_N7T8_icon-default.png_t_N7T8_https_www.lwjgl.org_browse_release_3.3.3]: https://www.lwjgl.org/browse/release/3.3.3
[LWJGL - Lightweight Java Game Library]: https://www.lwjgl.org/browse/release
[https_build.lwjgl.org_release_3.3.3_lwjgl-3.3.3.zip]: https://build.lwjgl.org/release/3.3.3/lwjgl-3.3.3.zip
[bc79b869ecba40d2b425bd057dc304bb.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/41176659afc144a481a9791e15fb0da3.png
[aa8fbe7fe4e5457c8b919363151470ef.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/e5da990681a347ff9a1e250c17373a79.png
[LWJGL - Lightweight Java Game Library_icon-default.png_t_N7T8_icon-default.png_t_N7T8_https_www.lwjgl.org_guide]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/c4cb7bf8b2e846868ed6ddf3ed3423ef.png
[777afeb6d3a143f5ad41a6c72cae67dd.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/d1d0834861554a6989d5742949bdb755.png
[5064aca5977a4f1abe0023740143bfd4.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/0c7277947e5b432abb270faf72945363.png