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sukiyq

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[ÇóÖú] OpenGLÀïÈ«¾Ö±äÁ¿ÒýÆðµÄÆæ¹ÖµÄÎÊÌâ

ϱßÊÇÒ»¸ö¹âÕÕµÄOpenGLʾÀý³ÌÐò£¬ÔËÐÐÓдíÎ󣬰ѳÌÐòÀïÍêȫûÓÐÓõ½µÄÈ«¾Ö±äÁ¿¡°GLfloat light_pos[] = {1.0, 2.0, 3.0, 0.0};¡±Ò»ÐÐɾ³ýÔËÐоÍÕý³£ÁË¡£ÕâÊÇΪʲô£¿Ã÷Ã÷Õâ¸öÈ«¾Ö±äÁ¿²¢Ã»ÓÐÓõ½£¬µ«ÊÇÉèÖÃÁËËü³ÌÐò¾Í»á³ö´í£¬ºÃÆæ¹Ö¡£

#include
        GLfloat vertices[][3] = {{-1.0,-1.0,-1.0},{1.0,-1.0,-1.0},
        {1.0,1.0,-1.0}, {-1.0,1.0,-1.0}, {-1.0,-1.0,1.0},
        {1.0,-1.0,1.0}, {1.0,1.0,1.0}, {-1.0,1.0,1.0}};


        GLfloat colors[][4] = {{1.0,0.0,0.0,0.5},
        {0.0,1.0,1.0,0.5}, {1.0,1.0,0.0,0.5},
        {0.0,1.0,0.0,0.5}, {0.0,0.0,1.0,0.5}, {1.0,0.0,1.0,0.5}};
        GLfloat light_pos[] = {1.0, 2.0, 3.0, 0.0};

void polygon(int a, int b, int c , int d)
{
        glColor4fv(colors[a]);
        if(colors[a][4] != 1.0) glDepthMask(GL_TRUE);
                else glDepthMask(GL_FALSE);
        glBegin(GL_POLYGON);
                glVertex3fv(vertices[a]);
                glVertex3fv(vertices);
                glVertex3fv(vertices[c]);
                glVertex3fv(vertices[d]);
        glEnd();
}

void cube()
{
        polygon(0,3,2,1);
        polygon(2,3,7,6);
        polygon(3,0,4,7);
        polygon(1,2,6,5);
        polygon(4,5,6,7);
        polygon(5,4,0,1);
}

static GLfloat theta[] = {0.0,0.0,0.0};
static GLint axis = 2;

void display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        glLoadIdentity();
        glRotatef(theta[0], 1.0, 0.0, 0.0);
        glRotatef(theta[1], 0.0, 1.0, 0.0);
        glRotatef(theta[2], 0.0, 0.0, 1.0);
        cube();
        glutSwapBuffers();
}

void spinCube()
{
        theta[axis] += 2.0;
        if( theta[axis] > 360.0 ) theta[axis] -= 360.0;
        glutPostRedisplay();
}

void mouse(int btn, int state, int x, int y)
{
        if(btn==GLUT_LEFT_BUTTON && state == GLUT_DOWN) axis = 0;
        if(btn==GLUT_MIDDLE_BUTTON && state == GLUT_DOWN) axis = 1;
        if(btn==GLUT_RIGHT_BUTTON && state == GLUT_DOWN) axis = 2;
}

void myReshape(int w, int h)
{
    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    if (w <= h)
        glOrtho(-2.0, 2.0, -2.0 * (GLfloat) h / (GLfloat) w,
            2.0 * (GLfloat) h / (GLfloat) w, -10.0, 10.0);
    else
        glOrtho(-2.0 * (GLfloat) w / (GLfloat) h,
            2.0 * (GLfloat) w / (GLfloat) h, -2.0, 2.0, -10.0, 10.0);
    glMatrixMode(GL_MODELVIEW);
}

void
main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
    glutInitWindowSize(500, 500);
    glutCreateWindow("colorcube";
    glutReshapeFunc(myReshape);
    glutDisplayFunc(display);
    glutIdleFunc(spinCube);
    glutMouseFunc(mouse);
    glEnable(GL_DEPTH_TEST); /* Enable hidden--surface--removal */
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glutMainLoop();
}
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glVertex3fv(vertices);
glutCreateWindow("colorcube";
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