OpenGL最简单框架 代码随笔练习,防止健忘

#include "stdafx.h"

#include <stdlib.h>
#include <GL/glut.h>

static int spin = 0;

void init (void)
{
    glClearColor (0.0, 0.0, 0.0, 0.0);
    glShadeModel (GL_SMOOTH);//圆滑模式
    glEnable(GL_LIGHTING);//启用 光源
    //glEnable(GL_LIGHT0); //支持0到7号(8个)光源
    //glEnable(GL_LIGHT7);
    glEnable(GL_LIGHT0);
    glEnable(GL_LIGHT1);
    GLfloat ambient[] = { 0.8, 0.0, 0.0, 1.0 };
    GLfloat diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
    GLfloat position[] = { 1.0, 1.0, 0.0, 0.0 };
    glLightfv(GL_LIGHT1, GL_AMBIENT, ambient);//强度
    glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse);//环境(漫反射)
    glLightfv(GL_LIGHT1, GL_POSITION, position);//位置


    glEnable(GL_DEPTH_TEST);
    glDisable(GL_CULL_FACE);
    //glEnable(GL_NORMALIZE);
}

void display (void)
{
    //glPushMatrix ();//压栈
    //glPopMatrix ();//出栈
    //glBegin(mode);//绘图开始
    //glEnd();//绘图结束
    //glTranslate*(x,y,z);//位移
    //glRotate* (angel,x,y,z);//旋转

    
    glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);//清空上帧缓冲区
    /*
    #define GL_POINTS                         0x0000 //点
    #define GL_LINES                          0x0001 //线
    #define GL_LINE_LOOP                      0x0002 //线(循环) 起始点与终点相连
    #define GL_LINE_STRIP                     0x0003 //相连线段
    #define GL_TRIANGLES                      0x0004 //三角形
    #define GL_TRIANGLE_STRIP                 0x0005 //相连三角形
    #define GL_TRIANGLE_FAN                   0x0006 //起点绘制多个三角形
    #define GL_QUADS                          0x0007 //四边形
    #define GL_QUAD_STRIP                     0x0008 //相连四边形
    #define GL_POLYGON                        0x0009 //起点绘制多个四边形
    */
    //二维
    //glBegin(GL_TRIANGLE_FAN);
    //    glColor3f (0.0, 1.0, 1.0);
    //    glVertex3f(0.0,0.0,0.0);
    //    glColor3f (1.0, 1.0, 1.0);
    //    glVertex3f(1.0,1.0,1.0);
    //    glColor3f (0.0, 1.0, 0.0);
    //    glVertex3f(-1.0,1.0,1.0);
    //    glColor3f (1.0, 0.0, 0.0);
    //    glVertex3f(-1.0,-1.0,1.0);
    //glEnd();
    /*
    GLUTAPI void APIENTRY glutWireSphere(GLdouble radius, GLint slices, GLint stacks);//glut白线球体
    GLUTAPI void APIENTRY glutSolidSphere(GLdouble radius, GLint slices, GLint stacks);//glut实体球体
    GLUTAPI void APIENTRY glutWireCone(GLdouble base, GLdouble height, GLint slices, GLint stacks);//glut白线圆锥
    GLUTAPI void APIENTRY glutSolidCone(GLdouble base, GLdouble height, GLint slices, GLint stacks);//glut实体圆锥
    GLUTAPI void APIENTRY glutWireCube(GLdouble size);//glut白线正立方体
    GLUTAPI void APIENTRY glutSolidCube(GLdouble size);//glut实体正立方体
    GLUTAPI void APIENTRY glutWireTorus(GLdouble innerRadius, GLdouble outerRadius, GLint sides, GLint rings);//glut白线圆环
    GLUTAPI void APIENTRY glutSolidTorus(GLdouble innerRadius, GLdouble outerRadius, GLint sides, GLint rings);//glut实体圆环
    GLUTAPI void APIENTRY glutWireDodecahedron(void);//glut白线十二面体
    GLUTAPI void APIENTRY glutSolidDodecahedron(void);//glut实体十二面体
    GLUTAPI void APIENTRY glutWireTeapot(GLdouble size);//glut白线茶壶
    GLUTAPI void APIENTRY glutSolidTeapot(GLdouble size);//glut实体茶壶
    GLUTAPI void APIENTRY glutWireOctahedron(void);//glut白线八面体
    GLUTAPI void APIENTRY glutSolidOctahedron(void);//glut实体八面体
    GLUTAPI void APIENTRY glutWireTetrahedron(void);//glut白线四面体
    GLUTAPI void APIENTRY glutSolidTetrahedron(void);//glut实体四面体
    GLUTAPI void APIENTRY glutWireIcosahedron(void);//glut白线二十面体
    GLUTAPI void APIENTRY glutSolidIcosahedron(void);//glut实体二十面体
    */
    //三维
    glPushMatrix ();
        gluLookAt (0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);//相机(眼睛)定位
        glPushMatrix ();
            glRotated ((GLdouble) spin, 1.0, 0.0, 0.0);
            GLfloat position[] = { 0.0, 0.0, 1.5, 1.0 };
            glLightfv (GL_LIGHT0, GL_POSITION, position);
            //glTranslated (0.0, 0.0, 1.5);
            glTranslated(position[0],position[1],position[2]);
            glDisable (GL_LIGHTING);
            glColor3f (0.0, 1.0, 1.0);
            glutWireCube (0.1);
            glEnable (GL_LIGHTING);
        glPopMatrix ();
        //glutSolidTorus (0.275, 0.85, 8, 15);
        glutSolidSphere(0.5,20,20);
    glPopMatrix ();
    glFlush ();//强制绘图完成上述
    glutSwapBuffers();//交换缓冲帧(画面)
}

void reshape(int w, int h)
{
    glViewport (0, 0, (GLsizei) w, (GLsizei) h);//视图 等同于 画布
    glMatrixMode (GL_PROJECTION);//对投影矩阵应用随后的矩阵操作.
    //glLoadIdentity ();
    //              x          width         y        height
    //gluOrtho2D(0.0, (GLdouble) w, 0.0, (GLdouble) h);//正投影(二维)
    //               src        宽高比                zNear    zFar    
    gluPerspective(40.0, (GLfloat) w/(GLfloat) h, 1.0, 20.0);//透视投影(三维)
    glMatrixMode(GL_MODELVIEW);//对模型视景矩阵堆栈应用随后的矩阵操作.
    glLoadIdentity();//恢复原位
}

void mouse(int button, int state, int x, int y)
{
    switch (button) {
      case GLUT_LEFT_BUTTON://左键
          if (state == GLUT_DOWN) {
              spin = (spin + 30) % 360;
              glutPostRedisplay();
          }
          break;
      case GLUT_MIDDLE_BUTTON://中键
          break;
      case GLUT_RIGHT_BUTTON://右键
          break;
      default:
          break;
    }
    switch(state){
        case GLUT_UP://松开
            break;
        case GLUT_DOWN://按下
            break;
        default:
            break;
    }
}

void keyboard(unsigned char key, int x, int y)
{
    switch (key) {
      case 27://ESC 
          exit(0);//退出
          break;
    }
}

int _tmain(int argc, char** argv)
{
    //输出OpenGL版本相关信息
    //const char* verstr = (const char*)glGetString( GL_VERSION ); 
    //printf("%s",verstr);
    //system( "@pause" );

    glutInit(&argc, argv);//初始化
    //显示模式                双缓冲区    RGB颜色        深度        多线程
    glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH | GLUT_MULTISAMPLE);
    glutInitWindowSize(200, 200);//窗口大小
    glutInitWindowPosition (100, 100);//窗口位置(左上角在显示屏位置)
    glutCreateWindow("Title");//标题
    //glutCreateWindow (argv[0]);
    glutCreateMenu(NULL);
    //glutFullScreen();//全屏
    
    init ();//初始化
    /*
    GLUTAPI void APIENTRY glutDisplayFunc(void (GLUTCALLBACK *func)(void));//注册渲染函数
    GLUTAPI void APIENTRY glutReshapeFunc(void (GLUTCALLBACK *func)(int width, int height));//注册窗口改变大小时函数
    GLUTAPI void APIENTRY glutKeyboardFunc(void (GLUTCALLBACK *func)(unsigned char key, int x, int y));//注册键盘按键函数
    GLUTAPI void APIENTRY glutMouseFunc(void (GLUTCALLBACK *func)(int button, int state, int x, int y));//注册鼠标按键函数
    GLUTAPI void APIENTRY glutMotionFunc(void (GLUTCALLBACK *func)(int x, int y));//注册鼠标按键拖动函数
    GLUTAPI void APIENTRY glutPassiveMotionFunc(void (GLUTCALLBACK *func)(int x, int y));//注册鼠标松开拖动函数
    GLUTAPI void APIENTRY glutEntryFunc(void (GLUTCALLBACK *func)(int state));//
    GLUTAPI void APIENTRY glutVisibilityFunc(void (GLUTCALLBACK *func)(int state));//
    GLUTAPI void APIENTRY glutIdleFunc(void (GLUTCALLBACK *func)(void));//注册空闲函数
    GLUTAPI void APIENTRY glutTimerFunc(unsigned int millis, void (GLUTCALLBACK *func)(int value), int value);//注册计时器函数
    GLUTAPI void APIENTRY glutMenuStateFunc(void (GLUTCALLBACK *func)(int state));//
    */
    glutReshapeFunc (reshape);
    glutDisplayFunc(display);
    glutKeyboardFunc (keyboard);
    glutMouseFunc(mouse);
    
    glutMainLoop();// 进入glut事件处理循环
    return 0; 
}