如何用OPENGL实现渐变颜色填充背景

Question

如题。
最好有代码演示。
谢谢！

Answer 1

void Initialize()
{
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glShadeModel(GL_SMOOTH);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
}void Render()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(0.0f, 0.0f, -50.0f);
glBegin(GL_POLYGON);//多边形
glColor3f(1.0f, 0.0f, 0.0f);//r
glVertex3f(-10.0f, -10.0f, -5.0f);
glColor3f(0.0f, 1.0f, 0.0f);//g
glVertex3f(10.0f, -10.0f, -5.0f);
glColor3f(0.0f, 0.0f, 1.0f);//b
glVertex3f(10.0f, 10.0f, -5.0f);
glColor3f(1.0f, 0.0f, 0.0f);//r
glVertex3f(-10.0f, 10.0f, -5.0f);
glEnd();
glFlush();
SwapBuffers(g_HDC);
}