glut为什么不能显示图形呀，黑屏？

[txwd0033]

各位老大，我是OpenGL的菜鸟。现在买了本OpenGL 编程指南（第六版），照着上面的例子，敲的代码运行时弹的window窗口是黑屏。简单的图形可以显示，但是复杂的好像就不行了，动画也不能显示，用的是GLUT的库，各位老大给瞅瞅吧，代码如下：

#include <windows.h>
#include <gl/glut.h>

static int year=0,day=0;

void init(void)
{
	glClearColor(0.0,0.0,0.0,0.0);

	glShadeModel(GL_FLAT);
}

void display(void)
{

	glClear(GL_COLOR_BUFFER_BIT);

	glColor3f(1.0,1.0,1.0);

	glPushMatrix();
	glutWireSphere(1.0,20,16);
	glRotatef((GLfloat)year,0.0,1.0,0.0);
	glTranslatef(2.0,0.0,0.0);
	glRotatef((GLfloat)day,0.0,1.0,0.0);
	glutWireSphere(0.2,10,8);
	glPopMatrix();
	glutSwapBuffers();


}

void reshape(int w,int h)
{
	glViewport(0,0,(GLsizei)w,(GLsizei)h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();

	gluPerspective(60.0,(GLfloat)w/(GLfloat)h,1.0,20.0);

	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	gluLookAt(0.0,0.0,5.0,0.0,0.0,0.0,0.0,1.0,0.0);

}

void keyboard(unsigned char key,int x,int y)
{
	switch(key)
	{
	case 'd':
		day=(day+10)%360;
		glutPostRedisplay();
		break;
	case 'D':
		day=(day-10)%360;
		glutPostRedisplay();
		break;
			case 'y':
		year=(year+5)%360;
		glutPostRedisplay();
		break;
	case 'Y':
		year=(year-5)%360;
		glutPostRedisplay();
		break;
	default:
		break;
	}
}


int main(int argc,char ** argv)
{
	glutInit(&argc,argv);
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
	glutInitWindowSize(500,500);
	glutInitWindowPosition(100,100);
	glutCreateWindow(argv[0]);
	init();
	glutDisplayFunc(display);
	glutReshapeFunc(reshape);
	glutKeyboardFunc(keyboard);
	glutMainLoop();
	return 0;
}

[txwd0033]

怎么没人呢？？

[fandh]

有人，但是opengl我好多年已经不再搞了，所以，还是等别人看吧！
帮楼主顶！

[zzz822163]

void reshape(int w, int h)
{
glViewport (0, 0, (GLsizei) w, (GLsizei) h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-50.0, 50.0, -50.0, 50.0, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}

glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
->>>
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);

[txwd0033]

谢谢楼上，改成glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB)就行了