OpenGL学习笔记 之二 （色彩相关）

#include <glut.h>
#include <math.h>

void myDisplay1(void)
{
    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(0.0f, 1.0f, 1.0f);//设置颜色
    glRectf(-0.5f, -0.5f, 0.5f, 0.5f);
    glFlush();
}
void myDisplay2(void)
{
    glClearColor(1.0f,0.0f,0.0f,0.0f);//设置清空成什么颜色
    glClear(GL_COLOR_BUFFER_BIT);
    glFlush();
}
const GLfloat Pi = 3.1415926;
void  myDisplay3()
{
    //glShadeModel(GL_FLAT);//保持单色
    //glShadeModel(GL_SMOOTH);//平滑过度
    glClear(GL_COLOR_BUFFER_BIT);
    glBegin(GL_TRIANGLE_FAN);//三角拼成的扇形
    glColor3f(1.0f,1.0f,1.0f);
    glVertex2f(0.0f,0.0f);
    for (int i=0; i<=16; i++)
    {
        glColor3f(i&0x4, i&0x2, i&0x1);
        glVertex2f(cos(i*2*Pi/16), sin(i*2*Pi/16));
    }
    glEnd();
    glFlush();
}
int main(int argc, char* argv[])
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB|GLUT_SINGLE);
    glutInitWindowPosition(100,100);
    glutInitWindowSize(400,400);
    glutCreateWindow("我的第一个opengl程序");
    glutDisplayFunc(&myDisplay2);
    glutMainLoop();
    return 0;
}