#include 
     
      #include 
      
       #include 
       
        #pragma comment(lib, "glew32.lib")GLuint g_VBO;GLuint g_VBO_TexCoord;GLuint g_VAO;GLuint g_FBO;GLuint g_Texture0;GLuint g_RBO;GLuint g_VBO2;GLuint g_VBO2_TexCoord;GLuint g_VBO2_Color;GLuint g_VAO2;const unsigned int WIDTH = 1024;const unsigned int HEIGHT = 1024;float xRot;float camRotX;float camRotY;float camRotZ;void InitVAO(){    float vertices[12] = {-1.0, -1.0, -0.0,                          1.0, -1.0, -0.0,                          1.0, 1.0, -0.0,                          -1.0, 1.0, -0.0};        float texcoord[8] = {
   0.0, 0.0,                         1.0, 0.0,                         1.0, 1.0,                         0.0, 1.0};    glGenVertexArrays(1, &g_VAO);    glBindVertexArray(g_VAO);    glGenBuffers(1, &g_VBO);    glBindBuffer(GL_ARRAY_BUFFER, g_VBO);    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);    glEnableClientState(GL_VERTEX_ARRAY);    //glEnableVertexAttribArray(0);//启用Shader时指定layout标识号    //glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);    glVertexPointer(3, GL_FLOAT, 0, 0);    glGenBuffers(1, &g_VBO_TexCoord);    glBindBuffer(GL_ARRAY_BUFFER, g_VBO_TexCoord);    glBufferData(GL_ARRAY_BUFFER, sizeof(texcoord), texcoord, GL_STATIC_DRAW);    glEnableClientState(GL_TEXTURE_COORD_ARRAY);    glEnable(GL_TEXTURE_2D);    glBindTexture(GL_TEXTURE_2D, g_Texture0);    glTexCoordPointer(2, GL_FLOAT, 0, 0);        glBindVertexArray(0);    glDisableClientState(GL_VERTEX_ARRAY);    glDisableClientState(GL_TEXTURE_COORD_ARRAY);}void InitVAO2(){    float vertices[9] = {-1.0, -1.0, -0.0,        1.0, -1.0, -0.0,        1.0, 1.0, -0.0};    float color[12] = {
   0.0, 0.0, 1.0, 0.4,        0.0, 0.0, 1.0, 0.4,        0.0, 0.0, 1.0, 0.4,    };    glGenVertexArrays(1, &g_VAO2);    glBindVertexArray(g_VAO2);    glGenBuffers(1, &g_VBO2);    glBindBuffer(GL_ARRAY_BUFFER, g_VBO2);    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);    glEnableClientState(GL_VERTEX_ARRAY);    glVertexPointer(3, GL_FLOAT, 0, 0);    glGenBuffers(1, &g_VBO2_Color);    glBindBuffer(GL_ARRAY_BUFFER, g_VBO2_Color);    glBufferData(GL_ARRAY_BUFFER, sizeof(color), color, GL_STATIC_DRAW);    glEnableClientState(GL_COLOR_ARRAY);    glColorPointer(4, GL_FLOAT, 0, 0);    glBindVertexArray(0);    glDisableClientState(GL_VERTEX_ARRAY);    glDisableClientState(GL_COLOR_ARRAY);}void InitFBO(){    glGenFramebuffers(1, &g_FBO);    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, g_FBO);        glGenTextures(1, &g_Texture0);    glBindTexture(GL_TEXTURE_2D, g_Texture0);    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, WIDTH, HEIGHT, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);    glGenerateMipmap(GL_TEXTURE_2D);    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, g_Texture0, 0);    glGenRenderbuffers(1, &g_RBO);    glBindRenderbuffer(GL_RENDERBUFFER, g_RBO);    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, WIDTH, HEIGHT);    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, g_RBO);    GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);    switch (status)    {    case GL_FRAMEBUFFER_COMPLETE:        {            std::cout << "Framebuffer SUCCESS!" << std::endl;            break;        }    case GL_FRAMEBUFFER_UNSUPPORTED:        {            std::cout << "FrameBufffer UNSCCESS" << std::endl;            break;        }    default:        break;    }    glBindFramebuffer(GL_FRAMEBUFFER, 0);}void Init(){    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);    xRot = 0.0f;    camRotX = 0.0f;    camRotY = 0.0f;    camRotZ = 0.0f;    InitVAO();    InitVAO2();    InitFBO();}void Display(){        glBindFramebuffer(GL_DRAW_FRAMEBUFFER, g_FBO);    glPushAttrib(GL_VIEWPORT_BIT);    glViewport(0, 0, WIDTH, HEIGHT);    glClearColor(1.0f, 0.0f, 1.0f, 1.0f);    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);    glMatrixMode(GL_PROJECTION);    glLoadIdentity();    gluPerspective(45.0, WIDTH/HEIGHT, 1.0, 100.0);    glMatrixMode( GL_MODELVIEW );    glLoadIdentity();    glTranslatef(0.0f, 0.0f, -3.0f);    glEnable(GL_TEXTURE_2D);    glBindTexture(GL_TEXTURE_2D, g_Texture0);    glRotatef(xRot,0.0,1.0,0.0);        glutSolidTeapot(0.1f);        glBindVertexArray(g_VAO2);        glDrawArrays(GL_TRIANGLES, 0, 3);        glBindVertexArray(0);    glPopAttrib();    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);        glClearColor(1.0f, 0.2f, 0.2f, 1.0f);    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);        glMatrixMode(GL_MODELVIEW);    glLoadIdentity();    glTranslatef(0.0, 0.0, -3.0);    glRotatef(camRotX, 1.0, 0.0f, 0.0f);    glRotatef(camRotY, 0.0, 1.0f, 0.0f);    glRotatef(camRotZ, 0.0, 0.0f, 1.0f);    glBindVertexArray(g_VAO);    glDrawArrays(GL_QUADS, 0, 4);    glBindVertexArray(0);        glutSwapBuffers();}void Resize(int w, int h){    if (0 == h)        {        h = 1;    }    glViewport(0, 0, w, h);    glMatrixMode(GL_PROJECTION);    glLoadIdentity();    gluPerspective(45.0, w/h, 1.0, 100.0);    glMatrixMode(GL_MODELVIEW);    glLoadIdentity();    }void OnTimer(int id){    xRot += 0.1;    //camRotX += 0.01;    camRotY += 0.05;    //camRotZ += 0.01;    Display();    glutTimerFunc(1, OnTimer, id);}int main(int argc, char ** argv){    glutInit(&argc, argv);    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA);    glutInitWindowSize(1024, 800);    glutCreateWindow("FBO-VBO-VAO");    GLenum res = glewInit();    if (GLEW_OK != res)    {        std::cout << "加载GLEW失败" << std::endl;    }    Init();    glutDisplayFunc(Display);    glutReshapeFunc(Resize);    glutTimerFunc(1, OnTimer, 1);    glutMainLoop();    return EXIT_SUCCESS;}