openGL 初试 绘制三角形 和添加鼠标键盘事件

code：

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

void render(void);
void keyboard(unsigned char c,int x,int y);
void mouse(int button,int state,int x,int y);

int main(int argc , char** argv){
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
glutInitWindowPosition(100,100);
glutInitWindowSize(640,480);
glutCreateWindow("simple glut application");

glutDisplayFunc(render);
glutKeyboardFunc(keyboard);
glutMouseFunc(mouse);

glutMainLoop();
}

//鼠标事件
void mouse(int button,int state,int x,int y){
if(button == GLUT_RIGHT_BUTTON ){
exit(0);
}
}

//键盘事件
void keyboard(unsigned char c,int x,int y){
if(c==27){
exit(0);
}
}

void render(void){
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glBegin(GL_TRIANGLES);

//分别设置三点的颜色是整体产生变化色

//设置颜色
glColor3f(1,0,0);
//绘制点
glVertex2f(-0.5,-0.5);
//设置颜色
glColor3f(0,1,0);
//绘制点
glVertex2f(0.5,-0.5);
//设置颜色
glColor3f(0,0,1);
//绘制点
glVertex2f(0.0,0.5);

glEnd();

glutSwapBuffers();

}

效果：