#include <GL/glut.h> ///(0)記得include
static void display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glutSwapBuffers();
glBegin(GL_TRIANGLES);
glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(0.0f, 1.0f);
glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(0.87f, -0.5f);
glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(-0.87f, -0.5f);
glEnd();
glutPopMatrix();
}
int main(int argc, char *argv[])
{
glutInit(&argc, argv);///(1)設定GLUT的初始化
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);///(2)顯示模式
glutCreateWindow("GLUT Shapes");///(3)開GLUT視窗
glutDisplayFunc(display);///(4)顯示函式
glutMainLoop();///(5)GLUT主要的迴圈,卡住不要結束
}


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