在glBegin和glEnd之间执行有效的函数
glVertex*() //设置顶点坐标 glColor*() //设置当前颜色 glIndex*() //设置当前颜色索引 glNormal*() //设置法线向量坐标 glTexCoord*() //设置纹理坐标 glMultiTexCoord*ARB() //为多重纹理映射设置纹理坐标 glEdgeFlag*() //控制边的绘制 glMaterial*() //设置材质属性 glArrayElement() //抽取顶点数组数据 glEvalCoord*()、glEvalPoint*() //生成坐标 glCallList()、glCallLists() //执行显示列表
缺省逆时针(GL_CCW)为正方向，可通过glFrontFace来指定面元的正面。
示例代码：
void DrawMyObjects(void)
{
/* draw some points */
glBegin(GL_POINTS);
glColor3f(1.0,0.0,0.0);
glVertex2f(-10.0,11.0);
glColor3f(1.0,1.0,0.0);
glVertex2f(-9.0,10.0);
glColor3f(0.0,1.0,1.0);
glVertex2f(-8.0,12.0);
glEnd();
/* draw some line_segments */
glBegin(GL_LINES);
glColor3f(1.0,1.0,0.0);
glVertex2f(-11.0,8.0);
glVertex2f(-7.0,7.0);
glColor3f(1.0,0.0,1.0);
glVertex2f(-11.0,9.0);
glVertex2f(-8.0,6.0);
glEnd();
/* draw one opened_line */
glBegin(GL_LINE_STRIP);
glColor3f(0.0,1.0,0.0);
glVertex2f(-3.0,9.0);
glVertex2f(2.0,6.0);
glVertex2f(3.0,8.0);
glVertex2f(-2.5,6.5);
glEnd();
/* draw one closed_line */
glBegin(GL_LINE_LOOP);
glColor3f(0.0,1.0,1.0);
glVertex2f(7.0,7.0);
glVertex2f(8.0,8.0);
glVertex2f(9.0,6.5);
glVertex2f(10.3,7.5);
glVertex2f(11.5,6.0);
glVertex2f(7.5,6.0);
glEnd();
/* draw one filled_polygon */
glBegin(GL_POLYGON);
glColor3f(0.5,0.3,0.7);
glVertex2f(-7.0,2.0);
glVertex2f(-8.0,3.0);
glVertex2f(-10.3,0.5);
glVertex2f(-7.5,-2.0);
glVertex2f(-6.0,-1.0);
glEnd();
/* draw some filled_quandrangles */
glBegin(GL_QUADS);
glColor3f(0.7,0.5,0.2);
glVertex2f(0.0,2.0);
glVertex2f(-1.0,3.0);
glVertex2f(-3.3,0.5);
glVertex2f(-0.5,-1.0);
glColor3f(0.5,0.7,0.2);
glVertex2f(3.0,2.0);
glVertex2f(2.0,3.0);
glVertex2f(0.0,0.5);
glVertex2f(2.5,-1.0);
glEnd();
/* draw some filled_strip_quandrangles */
glBegin(GL_QUAD_STRIP);
glVertex2f(6.0,-2.0);
glVertex2f(5.5,1.0);
glVertex2f(8.0,-1.0);
glColor3f(0.8,0.0,0.0);
glVertex2f(9.0,2.0);
glVertex2f(11.0,-2.0);
glColor3f(0.0,0.0,0.8);
glVertex2f(11.0,2.0);
glVertex2f(13.0,-1.0);
glColor3f(0.0,0.8,0.0);
glVertex2f(14.0,1.0);
glEnd();
/* draw some filled_triangles */
glBegin(GL_TRIANGLES);
glColor3f(0.2,0.5,0.7);
glVertex2f(-10.0,-5.0);
glVertex2f(-12.3,-7.5);
glVertex2f(-8.5,-6.0);
glColor3f(0.2,0.7,0.5);
glVertex2f(-8.0,-7.0);
glVertex2f(-7.0,-4.5);
glVertex2f(-5.5,-9.0);
glEnd();
/* draw some filled_strip_triangles */
glBegin(GL_TRIANGLE_STRIP);
glVertex2f(-1.0,-8.0);
glVertex2f(-2.5,-5.0);
glColor3f(0.8,0.8,0.0);
glVertex2f(1.0,-7.0);
glColor3f(0.0,0.8,0.8);
glVertex2f(2.0,-4.0);
glColor3f(0.8,0.0,0.8);
glVertex2f(4.0,-6.0);
glEnd();
/* draw some filled_fan_triangles */
glBegin(GL_TRIANGLE_FAN);
glVertex2f(8.0,-6.0);
glVertex2f(10.0,-3.0);
glColor3f(0.8,0.2,0.5);
glVertex2f(12.5,-4.5);
glColor3f(0.2,0.5,0.8);
glVertex2f(13.0,-7.5);
glColor3f(0.8,0.5,0.2);
glVertex2f(10.5,-9.0);
glEnd();
}
点的大小[方形] 反走样后点为圆形
void glPointSize(GLfloat size);
线宽
void glLineWidth(GLfloat width);
点画线 glEnable(GL_LINE_STIPPLE)
void glLineStipple(GLint factor, GLushort pattern);
多边形模式
线框模式：glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
void glPolygonMode(GLenum face, GLenum mode);
多边形剔除 glEnable(GL_CULL_FACE)
剔除反面：glCullFace(GL_BACK);
void glCullFace(GLenum mode);
点画多边形 glEnable(GL_POLYGON_STIPPLE)
void glPolygonStipple(const GLubyte *mask);
法线向量
归一化(开销较下要大) glEnable(GL_NORMALIZE)
均匀缩放归一化 glEnable(GL_RESCALE_NORMAL)