原文地址:http://www.blogjava.net/qileilove/archive/2014/01/23/409269.html
幀緩衝區有許多緩衝區構成,這些緩衝區大致分爲:
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(0, 0, -20);
glColor3f(1.0f,1.0f,1.0f);
dRadius = 5.0*(sqrt(2.0)/2.0);
glBegin(GL_LINE_STRIP);
for (dAngel=0;dAngel<380.0;dAngel+=0.1)
{
glVertex2d(dRadius*cos(dAngel),dRadius*sin(dAngel));
dRadius*=1.003;
}
glEnd();
glColor3f(1.0f,0.0f,0.0f);
glRectf(-5,-5,5,5);
void init()
{
glClearColor(0,0,1.0,0);
glClearStencil(0);
glClearDepth(1.0f);
glEnable(GL_STENCIL_TEST);
}
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_STENCIL_BUFFER_BIT);//1
glLoadIdentity();
glTranslatef(0, 0, -20);
glStencilFunc(GL_NEVER,0x0,0xFF); //2
glStencilOp(GL_INCR,GL_INCR,GL_INCR);//3
glColor3f(1.0f,1.0f,1.0f);
dRadius = 5.0*(sqrt(2.0)/2.0);
glBegin(GL_LINE_STRIP);
for (dAngel=0;dAngel<380.0;dAngel+=0.1)
{
glVertex2d(dRadius*cos(dAngel),dRadius*sin(dAngel));
dRadius*=1.003;
}
glEnd();
glStencilFunc(GL_NOTEQUAL,0x1,0xFF); //4
glStencilOp(GL_KEEP,GL_KEEP,KEEP); //5
glColor3f(1.0f,0.0f,0.0f);
glRectf(-5,-5,5,5);
#include "header.h"
float dRadius =0;
float dAngel;
float aspect=0;
void init()
{
glClearColor(0,0,1.0,0);
glClearStencil(0);
glClearDepth(1.0f);
glEnable(GL_STENCIL_TEST);
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_STENCIL_BUFFER_BIT);
glLoadIdentity();
glTranslatef(0, 0, -20);
////glStencilFunc(GL_ALWAYS, 0,0x00);
glStencilFunc(GL_NEVER,0x0,0xFF);
glStencilOp(GL_INCR,GL_INCR,GL_INCR);
glColor3f(1.0f,1.0f,1.0f);
dRadius = 5.0*(sqrt(2.0)/2.0);
glBegin(GL_LINE_STRIP);
for (dAngel=0;dAngel<380.0;dAngel+=0.1)
{
glVertex2d(dRadius*cos(dAngel),dRadius*sin(dAngel));
dRadius*=1.003;
}
glEnd();
glStencilFunc(GL_NOTEQUAL,0x1,0xFF);
glStencilOp(GL_INCR,GL_INCR,GL_INCR);//
glColor3f(1.0f,0.0f,0.0f);
glRectf(-5,-5,5,5);
glutSwapBuffers();
}
void reshape(int w, int h)
{
glViewport(0,0,w,h);
aspect = (w*1.0)/h;
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60, aspect, 1, 100);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
//glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA|GLUT_STENCIL);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA|GLUT_STENCIL|GLUT_DEPTH);
glutInitWindowPosition(200,200);
glutInitWindowSize(600,600);
glutCreateWindow("模板緩衝區與模板測試");
glewInit();
init();
glutReshapeFunc(reshape);
glutDisplayFunc(display);
glutMainLoop();
return 0;
}