opengl中bezier曲线在xp系统上的问题

今天，用opengl实现bezier曲线的绘制，但是当我将控制点增加到九个的时候，程序死活绘制不出图像。

后来经过一番折腾，终于知道，是xp系统的问题，程序在win7上可以正常运行。

下面我附上我的主要程序

第一段是利用glEvalCoord1f() 

函数先生成离散点，然后用直线链接。

 

	glShadeModel(GL_FLAT);  
	glColor3f(1.0,0.0,0.0);
	
	GLfloat controlPoint[9][3] = {
		{-1.0f,0.0f,0.0f},{-0.75f,0.707f,0.0f},{-0.5f,1.0f,0.0f},
		{-0.25f,0.707f,0.0f},{0.0f,0.0f,0.0f},{0.25f,-0.707f,0.0f},
		{0.5f,-1.0f,0.0f},{0.75f,-0.707f,0.0f},{1.0f,0.0f,0.0f}
	};
	glMap1f(GL_MAP1_VERTEX_3,0.0,1.0,3,8,(const float*)controlPoint);
	glEnable(GL_MAP1_VERTEX_3);


	
glBegin(GL_LINE_STRIP);
		for(int i = 0;i <= 100; i++)
			glEvalCoord1f((GLfloat)i/(GLfloat)100.0);
	glEnd();
	glDisable(GL_MAP1_VERTEX_3); 

 

第二段是利用glMapGrid1d();对u参数进行自动等分。再用glEvalMesh1（）函数产生一系列的点并利用这些顶点坐标最终绘制一条曲线。

 

 

	glShadeModel(GL_FLAT);  
	glColor3f(1.0,0.0,0.0);
	
	GLfloat controlPoint[9][3] = {
		{-1.0f,0.0f,0.0f},{-0.75f,0.707f,0.0f},{-0.5f,1.0f,0.0f},
		{-0.25f,0.707f,0.0f},{0.0f,0.0f,0.0f},{0.25f,-0.707f,0.0f},
		{0.5f,-1.0f,0.0f},{0.75f,-0.707f,0.0f},{1.0f,0.0f,0.0f}
	};
	glMap1f(GL_MAP1_VERTEX_3,0.0,1.0,3,8,(const float*)controlPoint);
	glEnable(GL_MAP1_VERTEX_3);
	glMapGrid1f(50,0.0f,1.0f);
	glEvalMesh1(GL_LINE,0,50);
	glDisable(GL_MAP1_VERTEX_3);